JPWO2019017423A1 - Ink composition, method for producing the same, light conversion layer, and color filter - Google Patents

Abstract

The present invention provides an ink composition containing luminescent nanocrystal particles, a thermosetting resin, and an organic solvent, wherein the organic solvent has a LogP value of -1.0 or more and 6.5 or less. It is provided. Further, it contains luminescent nanocrystalline particles, a thermosetting resin, and an organic solvent, the organic solvent has a LogP value of -1.0 or more and 6.5 or less, and contains water (H2O) based on a Karl Fischer moisture meter. The ink composition is characterized by having a rate of 90 ppm or less. Also provided is a light conversion layer including a plurality of pixel portions, wherein the plurality of pixel portions includes a light conversion layer having a pixel portion containing a cured product of an ink composition, and a color filter including the light conversion layer. To do.

Description

The present invention relates to an ink composition, a method for producing the same, a light conversion layer, and a color filter.

Conventionally, a color filter pixel portion in a display such as a liquid crystal display device uses, for example, a curable resist material containing red organic pigment particles or green organic pigment particles and an alkali-soluble resin and/or an acrylic monomer. , Have been manufactured by the photolithography method.

In recent years, there has been a strong demand for lower power consumption of displays, and in place of the red organic pigment particles or the green organic pigment particles, for example, quantum dots, quantum rods, and other luminescent nanocrystalline particles such as inorganic phosphor particles. A method of forming a color filter pixel portion such as a red pixel or a green pixel by using is actively studied.

By the way, the method of manufacturing a color filter by the photolithography method has a drawback that the resist material other than the pixel portion including the relatively expensive luminescent nanocrystal particles is wasted due to the characteristic of the manufacturing method. Under these circumstances, in order to eliminate the waste of the resist material as described above, formation of the light conversion substrate pixel portion by an inkjet method is being studied.

It is known that various kinds of thermosetting resins are used in such an ink composition, and most of these thermosetting resins are liquid or solid with high viscosity, and are easy to handle. In many cases, it is dissolved or dispersed in an organic solvent. There is no knowledge such as how to select and use an organic solvent that specifically satisfies the characteristics, and it is possible to reduce the problem of the light conversion layer made of the cured product, and each thermosetting resin and organic solvent It was the actual situation that the light conversion layer was formed by curing using, and various characteristic items of the light conversion layer were measured, and the presence or absence of defects was confirmed through trial and error.

For example, there is a problem that water in the air is dissolved in the quantum dot ink composed of luminescent nanocrystal particles and deteriorates.
Patent Document 1 discloses a formulation containing a solvent saturated or supersaturated with an inert gas, and a functional organic material, as well as a formulation in which the total amount of oxygen and water is below a certain level.
However, this patent document 1 does not describe the use of a thermosetting resin.
Moreover, the actual measurement data of the water content is not shown, and it was unclear how much water content affects and how much.
Further, regarding the organic light emitting material for OLED, the influence of the atmosphere is shown in the examples, but there is no disclosure as to whether or not a specific technical effect is exhibited with respect to the quantum dots composed of the light emitting nanocrystal particles, and the quantum dots are not disclosed. It was unclear how much technical effect there was. In addition, the OLED light-emitting materials shown in the examples do not have a wavelength conversion function and cannot be diverted to a light conversion layer formed of quantum dots.
Further, when a solvent saturated or supersaturated with an inert gas is used, bubbles are generated in the flow path of the coating liquid when the coating liquid is fed using a pump to a coater head or nozzle for coating, Bubbles are mixed in the coating liquid, which causes a problem such as a defective coated product. Further, when it is used as an inkjet ink, there is a big problem that air bubbles are generated in the print head of an inkjet printer and ejection failure occurs.

Patent Document 2 discloses a composition containing quantum dots substantially free of water. However, the actual data of water content is not shown, and it is unclear how much water is effective.
Further, the IJ method is not described, and the application of the light conversion layer to the color filter (CF) for LCD is not described.
In the IJ method, ink is ejected from the nozzles of the printing head into the atmosphere, exposed to moisture in the air, and exposed to the atmosphere even after printing. Since the CF substrate has a large area, providing a water-free inert gas atmosphere in the vicinity of the head portion and the printing surface on the printing substrate causes a problem that the apparatus price and the running cost increase significantly. Therefore, even if the ink is exposed to the humidity in the atmosphere, there has been a demand for an ink that does not deteriorate the performance of the quantum dots.
Therefore, there has been a demand for an ink that causes less deterioration of the quantum dots and that causes less bubbles during liquid transfer or in the IJ head.

Patent Document 3 discloses that an inert gas is introduced to expel dissolved oxygen to degas oxygen, and degassing is performed by reducing pressure. It also discloses that the emission of a quantum dot (QD) composition containing no oxygen is less likely to deteriorate.
However, when the IJ printing ink or the ink cured film is exposed to the atmosphere, the QD is exposed to the moisture in the atmosphere. In such a case, deterioration cannot be suppressed by a known method, and a QD composition or a cured product thereof which is advantageous for IJ printing is desired.

Although Patent Documents 2 to 3 describe that an acrylate monomer or oligomer can be used as the photocurable compound, the monomer actually used in the experiment is a long-chain monomer such as dodecanediol di(meth)acrylate. Only di(meth)acrylates containing chain alkylene groups. These are not thermosetting resins.

Special table 2016-501430 gazette US Published Patent 2014/0027673 WO2013/122820

Since the ink composition using the luminescent nanocrystal particles and the light conversion layer using the ink composition are unstable with respect to moisture in the atmosphere, it is necessary to improve the stability.

An object of the present invention is to provide an ink composition having improved stability against moisture, a method for producing the same, and a light conversion layer and a color filter using the ink composition.

The present invention provides the inventions of the following embodiments.
According to the ink composition of 1 below, since the organic solvent in the specific LogP value range is used as the organic solvent, the cured product does not have a defect, and the stability in the atmosphere can be improved, for example. ..

1. Contains luminescent nanocrystalline particles, thermosetting resin and organic solvent,
An ink composition, wherein the LogP value of the organic solvent is -1.0 or more and 6.5 or less.
2. Contains luminescent nanocrystalline particles, thermosetting resin and organic solvent,
The LogP value of the organic solvent is -1.0 or more and 6.5 or less,
An ink composition having a moisture (H ₂ O) content of 90 ppm or less based on a Karl Fischer moisture meter.
3. Contains luminescent nanocrystalline particles, thermosetting resin and organic solvent,
The LogP value of the organic solvent is -1.0 or more and 6.5 or less,
An inkjet ink composition having a water content (H ₂ O) content of 90 ppm or less based on a Karl Fischer water content meter.
4. 4. The method for producing an ink composition for inkjet according to the above 3, wherein the ink composition is depressurized to remove dissolved gas.
5. 4. The inkjet ink composition according to 3, wherein the water content (H ₂ O) content is 20 ppm or less.
6. 6. The inkjet ink composition according to any one of 3 and 5 above, wherein the thermosetting resin is insoluble in alkali.
7. 7. The inkjet ink composition according to any one of 3, 5, or 6 above, which is capable of forming an alkali-insoluble coating film.
8. 8. The inkjet ink composition according to any one of 3, 5, 6 or 7 having a surface tension of 20 to 40 mN/m.
9. 9. The inkjet ink composition according to any one of 3, 5, 6, 7 or 8 having a viscosity of 2 to 20 mPa·s.
10. 10. The inkjet ink composition according to any one of 3, 5, 6, 7, 8 or 9 further containing a solvent having a boiling point of 180° C. or higher.
11. 11. The inkjet ink composition according to any one of 3, 5, 6, 7, 8, 9 or 10 for a color filter.

12. A light conversion layer comprising a cured product of the ink composition according to any one of 1 to 3 above.
13. A light conversion layer comprising a cured product of the ink composition according to any one of items 1 to 3, wherein the light conversion layer is insoluble in alkali.
14. A light conversion layer having a plurality of pixel portions,
The light conversion layer, wherein each of the plurality of pixel portions has a pixel portion containing a cured product of the inkjet ink composition according to any one of 3, 5, 6, 7, 8, 9 or 10.
15. Further comprising a light shielding portion provided between the plurality of pixel portions,
The plurality of pixel units,
The luminescent nanocrystalline particles containing the cured product and containing, as the luminescent nanocrystalline particles, light that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having an emission peak wavelength in the range of 605 to 665 nm. , A first pixel portion,
The luminescent nanocrystalline particles containing the cured product and containing, as the luminescent nanocrystalline particles, light that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having an emission peak wavelength in the range of 500 to 560 nm. And a second pixel portion, The light conversion layer according to any one of 12 to 14 above.
16. 16. The light conversion layer according to any one of 12 to 15, wherein each of the plurality of pixel units further includes a third pixel unit having a transmittance of 30% or more for light having a wavelength in the range of 420 to 480 nm.
17. A color filter comprising the light conversion layer according to any one of 12 to 16 above.

It is possible to provide an ink composition having improved stability in the atmosphere, a method for producing the same, and a light conversion layer and a color filter using the ink composition.

FIG. 1 is a schematic sectional view of a color filter according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.

<Ink composition>
The ink composition of the embodiment contains luminescent nanocrystalline particles, a thermosetting resin, and an organic solvent,
The LogP value of the organic solvent is -1.0 or more and 6.5 or less.

The ink composition of one embodiment is an ink composition for a color filter used for forming a pixel portion of a color filter by a method such as a photolithography method or an inkjet method.

The ink composition of one embodiment is preferably used for forming color filter pixel portions by an inkjet method.
In the case of forming a color filter pixel portion using a conventional ink composition by an inkjet method, for example, there is a problem that the light conversion layer deteriorates when exposed to moisture in the atmosphere.
On the other hand, according to the ink composition of the present embodiment, such a problem can be solved.

Hereinafter, the ink composition for a color filter used in the inkjet system (inkjet ink for a color filter) will be described as an example.

[Luminescent nanocrystalline particles]
Luminescent nanocrystalline particles are nanosized crystals that absorb excitation light and emit fluorescence or phosphorescence, and have a maximum particle diameter of 100 nm or less measured by a transmission electron microscope or a scanning electron microscope, for example. It is a crystalline body.

The luminescent nanocrystalline particles can emit light having a wavelength different from the absorbed wavelength (fluorescence or phosphorescence) by absorbing light having a predetermined wavelength, for example. The luminescent nanocrystalline particles may be red luminescent nanocrystalline particles that emit light (red light) having an emission peak wavelength in the range of 605 to 665 nm, and light having an emission peak wavelength in the range of 500 to 560 nm. It may be a green light-emitting nanocrystalline particle that emits (green light), or may be a blue-emitting nanocrystalline particle that emits light (blue light) having an emission peak wavelength in the range of 420 to 480 nm. .. In one embodiment, it is preferred that the ink composition comprises at least one of these luminescent nanocrystalline particles. Further, the light absorbed by the luminescent nanocrystal particles may be, for example, light having a wavelength in the range of 400 nm or more and less than 500 nm (blue light), or light having a wavelength in the range of 200 nm to 400 nm (ultraviolet light). The emission peak wavelength of the luminescent nanocrystal particles can be confirmed by, for example, a fluorescence spectrum or a phosphorescence spectrum measured using an ultraviolet-visible spectrophotometer.

The red light emitting nanocrystalline particles are 665 nm or less, 663 nm or less, 660 nm or less, 658 nm or less, 655 nm or less, 653 nm or less, 651 nm or less, 650 nm or less, 647 nm or less, 645 nm or less, 643 nm or less, 640 nm or less, 637 nm or less, 635 nm or less. , 632 nm or less or 630 nm or less, and preferably 628 nm or more, 625 nm or more, 623 nm or more, 620 nm or more, 615 nm or more, 610 nm or more, 607 nm or more, or 605 nm or more. These upper limit values and lower limit values can be arbitrarily combined. In addition, also in the following similar description, the upper limit value and the lower limit value described individually can be arbitrarily combined.

The green-emitting nanocrystalline particles have an emission peak wavelength at 560 nm or less, 557 nm or less, 555 nm or less, 550 nm or less, 547 nm or less, 545 nm or less, 543 nm or less, 537 nm or less, 535 nm or less, 532 nm or less, or 530 nm or less. Preferably, it has an emission peak wavelength at 528 nm or more, 525 nm or more, 523 nm or more, 520 nm or more, 515 nm or more, 510 nm or more, 507 nm or more, 505 nm or more, 503 nm or more, or 500 nm or more.

The blue-emitting nanocrystalline particles have an emission peak wavelength at 480 nm or less, 477 nm or less, 475 nm or less, 470 nm or less, 467 nm or less, 465 nm or less, 463 nm or less, 460 nm or less, 457 nm or less, 455 nm or less, 452 nm or less, or 450 nm or less. It is preferable that the emission peak wavelength is 450 nm or more, 445 nm or more, 440 nm or more, 435 nm or more, 430 nm or more, 428 nm or more, 425 nm or more, 422 nm or more, or 420 nm or more.

According to the solution of the Schrodinger wave equation of the well-type potential model, the wavelength of light emitted by the luminescent nanocrystalline particles (luminescent color) depends on the size (eg, particle diameter) of the luminescent nanocrystalline particles, but It also depends on the energy gap of the crystal grains. Therefore, the luminescent color can be selected by changing the constituent material and size of the luminescent nanocrystalline particles used.

The luminescent nanocrystalline particles may be luminescent nanocrystalline particles (luminescent semiconductor nanocrystalline particles) containing a semiconductor material. Examples of the luminescent semiconductor nanocrystal particles include quantum dots (hereinafter also referred to as “QD”), quantum rods, and the like. Among these, quantum dots are preferable from the viewpoints that the emission spectrum can be easily controlled, the reliability can be ensured, the production cost can be reduced, and the mass productivity can be improved.

The luminescent semiconductor nanocrystalline particles may consist only of a core containing a first semiconductor material, and a core containing a first semiconductor material and a second semiconductor material different from the first semiconductor material, And a shell that covers at least a part of the core. In other words, the structure of the light-emitting semiconductor nanocrystal particles may be a structure composed of only a core (core structure) or a structure composed of a core and a shell (core/shell structure). Further, the luminescent semiconductor nanocrystal particle contains, in addition to the shell (first shell) containing the second semiconductor material, a third semiconductor material different from the first and second semiconductor materials, You may further have the shell (2nd shell) which covers at least one part. In other words, the structure of the luminescent semiconductor nanocrystal particles may be a structure composed of a core, a first shell and a second shell (core/shell/shell structure). Each of the core and the shell may be a mixed crystal containing two or more kinds of semiconductor materials (for example, CdSe+CdS, CIS+ZnS, etc.).

The luminescent nanocrystalline particles are selected as a semiconductor material from the group consisting of II-VI group semiconductors, III-V group semiconductors, I-III-VI group semiconductors, IV group semiconductors and I-II-IV-VI group semiconductors. It is preferable to include at least one kind of semiconductor material.

Specific semiconductor materials are CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSe, CdSe, CgSe, CgSe, CgSe, CgSe, CgSe, CgSe, CgSe, CgSe, CdSe, CgSe, CgSe, CgSe, CgSe, CdSe, CdSe, CdSe, CdSe, CdSe, CdSe, CdSeS, CdSeS, CgSeTe, ZnSe, CgSe, CdSe, CdSe CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, CdHgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeAl, Pd, HgZnSe, CdHgSeT, HgZnSe, HgZnSe, HgZnSe, CdHgZeS, HgZnSe InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNSGa, AlPSAs, GaAlNSb, GaAlNSb, GaAlNSb, GaAlPSb GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb; SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe,
PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, SnPbSTe; Si, Ge, SiC, SiGe, AgInSe 2, CuGaSe 2, CuInS 2, CuGaS 2, CuInSe 2, AgInS 2, AgGaSe 2, AgGaS 2, C, Si and Ge are mentioned. The luminescent semiconductor nanocrystalline particles are easy to control the luminescence spectrum and, while ensuring reliability, can reduce the production cost and improve the mass productivity, CdS, CdSe, CdTe, ZnS, _{ZnSe, ZnTe, ZnO, HgS,} HgSe, HgTe, InP, InAs, InSb, GaP, GaAs, GaSb, AgInS 2, AgInSe 2, AgInTe 2, AgGaS 2, AgGaSe 2, AgGaTe 2, CuInS 2, CuInSe 2, CuInTe 2 , CuGaS ₂ , CuGaSe ₂ , CuGaTe ₂ , Si, C, Ge and Cu ₂ ZnSnS ₄ are preferably included.

Examples of the red-emitting semiconductor nanocrystal particles include CdSe nanocrystal particles, CdSe rod-shaped nanocrystal particles, and rod-shaped nanocrystal particles having a core-shell structure, and the shell portion is CdS. A nanocrystalline particle having an inner core portion of CdSe, a rod-shaped nanocrystalline particle having a core-shell structure, wherein the shell portion is CdS, and the inner core portion is ZnSe, a core-shell structure Nano-crystalline particles, wherein the shell portion is CdS and the inner core portion is CdSe, and the nano-crystalline particle has a core-shell structure, wherein the shell portion is CdS and the inner core portion is ZnSe is a nanocrystal particle, a mixed crystal of CdSe and ZnS, a rod-shaped nanocrystal particle of a mixed crystal of CdSe and ZnS, an InP nanocrystal particle, an InP nanocrystal particle, an InP rod. -Shaped nanocrystal particles, mixed crystal nanocrystal particles of CdSe and CdS, rod-shaped nanocrystal particles of mixed crystal of CdSe and CdS, mixed crystal nanocrystal particles of ZnSe and CdS, of ZnSe and CdS Examples include mixed crystal rod-shaped nanocrystal particles.

Examples of the green-emitting semiconductor nanocrystal particles include CdSe nanocrystal particles, CdSe rod-shaped nanocrystal particles, mixed crystal nanocrystal particles of CdSe and ZnS, and mixed crystal rod shape of CdSe and ZnS. Examples thereof include nano crystal particles.

Examples of the blue-light-emitting semiconductor nanocrystal particles include ZnSe nanocrystal particles, ZnSe rod-shaped nanocrystal particles, ZnS nanocrystal particles, ZnS rod-shaped nanocrystal particles, and nanocrystals having a core-shell structure. Nanoparticles having a shell portion of ZnSe and an inner core portion of ZnS, rod-shaped nanocrystals having a core-shell structure, wherein the shell portion is ZnSe and the inner core portion is Examples thereof include ZnS nanocrystal particles, CdS nanocrystal particles, and CdS rod-shaped nanocrystal particles. The semiconductor nanocrystal particles have the same chemical composition, and by changing the average particle diameter of themselves, the color to be emitted from the particles can be changed to red or green. As the semiconductor nanocrystal particles, it is preferable to use, as such, particles having a minimal adverse effect on the human body and the like. When the semiconductor nanocrystal particles containing cadmium, selenium, etc. are used as the luminescent nanocrystal particles, the semiconductor nanocrystal particles which do not contain the above-mentioned elements (cadmium, selenium, etc.) as much as possible are selected and used alone or It is preferable to use it in combination with other luminescent nanocrystalline particles so as to minimize the amount.

The shape of the luminescent nanocrystal particles is not particularly limited, and may be any geometric shape or any irregular shape. The shape of the luminescent nanocrystal particles may be, for example, a spherical shape, an ellipsoidal shape, a pyramidal shape, a disk shape, a branch shape, a net shape, a rod shape, or the like. However, as the luminescent nanocrystal particles, it is possible to further improve the uniformity and fluidity of the ink composition by using particles having a small particle shape (for example, particles having a spherical shape or a regular tetrahedron shape). Is preferred.

The average particle diameter (volume average diameter) of the luminescent nanocrystalline particles may be 1 nm or more, from the viewpoint that emission of a desired wavelength is easily obtained, and that the dispersibility and storage stability are excellent, and 1.5 nm. It may be above, and may be 2 nm or more. From the viewpoint of easily obtaining a desired emission wavelength, it may be 40 nm or less, 30 nm or less, or 20 nm or less. The average particle diameter (volume average diameter) of the luminescent nanocrystalline particles can be obtained by measuring with a transmission electron microscope or a scanning electron microscope and calculating the volume average diameter.

From the viewpoint of dispersion stability, the luminescent nanocrystal particles preferably have an organic ligand on the surface. The organic ligand may be coordinate-bonded to the surface of the luminescent nanocrystalline particle, for example. In other words, the surface of the luminescent nanocrystalline particles may be passivated with an organic ligand. The luminescent nanocrystalline particles may have a polymer dispersant on the surface thereof. In one embodiment, for example, by removing the organic ligand from the luminescent nanocrystalline particles having the above-mentioned organic ligand and replacing the organic ligand with the polymeric dispersant, the polymeric dispersant is added to the surface of the luminescent nanocrystalline particles. May be combined. However, from the viewpoint of dispersion stability when used as an inkjet ink, it is preferable to add a polymer dispersant to the luminescent nanocrystal particles with the organic ligand still coordinated.

Examples of the organic ligand include TOP (trioctylphosphine), TOPO (trioctylphosphine oxide), oleic acid, oleylamine, octylamine, trioctylamine, hexadecylamine, octanethiol, dodecanethiol, hexylphosphonic acid ( HPA), tetradecylphosphonic acid (TDPA), and octylphosphinic acid (OPA).

As the luminescent nanocrystalline particles, those dispersed in an organic solvent in a colloidal form can be used. The surface of the luminescent nanocrystalline particles in a dispersed state in an organic solvent is preferably passivated with the above-mentioned organic ligand. Examples of the organic solvent include cyclohexane, hexane, heptane, chloroform, toluene, octane, chlorobenzene, tetralin, diphenyl ether, propylene glycol monomethyl ether acetate, butyl carbitol acetate, or a mixture thereof.

Commercially available products can be used as the luminescent nanocrystalline particles. Examples of commercially available luminescent nanocrystalline particles include NN-Labose's indium phosphide/zinc sulfide, D-dots, CuInS/ZnS, and Aldrich's InP/ZnS.

The content of the luminescent nanocrystal particles may be 5% by mass or more, or 10% by mass or more, based on the mass of the nonvolatile content of the ink composition, from the viewpoint of being more excellent in the leakage light reducing effect. , 15% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more. From the viewpoint of excellent ejection stability, the content of the luminescent nanocrystalline particles may be 70% by mass or less, or 60% by mass or less, based on the mass of the nonvolatile content of the ink composition, 55 It may be less than or equal to mass %, or less than or equal to 50 mass %. In the present specification, the “mass of the non-volatile content of the ink composition” refers to the mass of the total mass of the ink composition minus the mass of the organic solvent.

By the way, the luminescent nanocrystal particles have high reactivity because they have surface atoms that can serve as coordination sites. Luminescent nanocrystalline particles have such high reactivity and have a large surface area as compared with general pigments, and therefore particles are likely to aggregate. Since the luminescent nanocrystal particles emit light due to the quantum size effect, when particles agglomerate, a quenching phenomenon occurs, resulting in a decrease in fluorescence quantum yield, and deterioration in brightness and color reproducibility. On the other hand, in this embodiment, since the ink composition contains the polymer dispersant, the luminescent nanocrystal particles are unlikely to aggregate. Therefore, in the present embodiment, the content of the luminescent nanocrystal particles can be set within the above range.

[Light scattering particles]
The ink composition of one embodiment may contain light scattering particles. When a color filter pixel portion (hereinafter, also simply referred to as a “pixel portion”) is formed of an ink composition using the luminescent nanocrystalline particles, the light from the light source is not absorbed by the luminescent nanocrystalline particles to form the pixel portion. May leak from. Since such leak light reduces the color reproducibility of the pixel portion, it is preferable to reduce the leak light as much as possible when the pixel portion is used as the light conversion layer. The light-scattering particles are preferably used in order to prevent light leakage from the pixel section. The light-scattering particles are, for example, optically inactive inorganic fine particles. The light-scattering particles can scatter light from the light source with which the color filter pixel portion is irradiated.

Examples of the material forming the light-scattering particles include simple metals such as tungsten, zirconium, titanium, platinum, bismuth, rhodium, palladium, silver, tin, platinum, and gold; silica, barium sulfate, barium carbonate, calcium carbonate, Metal oxides such as talc, titanium oxide, clay, kaolin, barium sulfate, barium carbonate, calcium carbonate, alumina white, titanium oxide, magnesium oxide, barium oxide, aluminum oxide, bismuth oxide, zirconium oxide, zinc oxide; magnesium carbonate, Metal carbonates such as barium carbonate, bismuth subcarbonate and calcium carbonate; metal hydroxides such as aluminum hydroxide; complex oxides such as barium zirconate, calcium zirconate, calcium titanate, barium titanate and strontium titanate. Examples thereof include metal salts such as bismuth subnitrate. The light-scattering particles preferably contain at least one selected from the group consisting of titanium oxide, alumina, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate, and silica, from the viewpoint of being more excellent in the effect of reducing leakage light. It is more preferable to contain at least one selected from the group consisting of titanium oxide, barium sulfate and calcium carbonate.

The light-scattering particles may have a spherical shape, a filament shape, an irregular shape, or the like. However, as the light-scattering particles, it is preferable to use particles having a small directionality as a particle shape (for example, particles having a spherical shape or a regular tetrahedron shape) to improve the uniformity, fluidity and light scattering property of the ink composition. It is preferable in that it can be enhanced.

The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition may be 0.05 μm or more, or may be 0.2 μm or more, from the viewpoint of being more excellent in the effect of reducing leakage light. It may be 0.3 μm or more. The average particle size (volume average size) of the light-scattering particles in the ink composition may be 1.0 μm or less, or may be 0.6 μm or less, from the viewpoint of excellent ejection stability. It may be 0.4 μm or less. The average particle diameter (volume average diameter) of the light-scattering particles in the ink composition is 0.05 to 1.0 μm, 0.05 to 0.6 μm, 0.05 to 0.4 μm, 0.2 to 1 It may be 0.0 μm, 0.2 to 0.6 μm, 0.2 to 0.4 μm, 0.3 to 1.0 μm, 0.3 to 0.6 μm, or 0.3 to 0.4 μm. From the viewpoint of easily obtaining such an average particle diameter (volume average diameter), the average particle diameter (volume average diameter) of the light-scattering particles to be used may be 50 nm or more, and may be 1000 nm or less. The average particle diameter (volume average diameter) of the light scattering particles is obtained by measuring with a dynamic light scattering type Nanotrac particle size distribution meter and calculating the volume average diameter. The average particle diameter (volume average diameter) of the light-scattering particles to be used can be obtained, for example, by measuring the particle diameter of each particle with a transmission electron microscope or a scanning electron microscope and calculating the volume average diameter.

The content of the light-scattering particles may be 0.1% by mass or more, or even 1% by mass or more, based on the mass of the nonvolatile content of the ink composition, from the viewpoint of being more excellent in the leakage light reducing effect. It may be 5% by mass or more, 7% by mass or more, 10% by mass or more, and 12% by mass or more. The content of the light-scattering particles may be 60% by mass or less based on the mass of the nonvolatile content of the ink composition, and may be 50% by mass, from the viewpoint of being more excellent in the leakage light reducing effect and the discharging stability. Or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass It may be the following. In the present embodiment, since the ink composition contains the polymer dispersant, the light scattering particles can be well dispersed even when the content of the light scattering particles is within the above range.

The mass ratio of the content of the light scattering particles to the content of the luminescent nanocrystalline particles (light scattering particles/luminescent nanocrystalline particles) is 0.1 to 5.0. The mass ratio (light-scattering particles/luminescent nanocrystal particles) may be 0.2 or more, or may be 0.5 or more, from the viewpoint of being more excellent in the leakage light reducing effect. The mass ratio (light-scattering particles/luminescent nanocrystal particles) may be 2.0 or less, and may be 1.5 or less, from the viewpoint of excellent leakage light reduction effect and excellent continuous dischargeability during inkjet printing. May be The mass ratio (light-scattering particles/luminescent nanocrystal particles) is 0.1 to 2.0, 0.1 to 1.5, 0.2 to 5.0, 0.2 to 2.0, 0. It may be 2 to 1.5, 0.5 to 5.0, 0.5 to 2.0, or 0.5 to 1.5. It is considered that the reduction of leaked light by the light scattering particles is due to the following mechanism. That is, when there are no light-scattering particles, it is considered that the backlight light only travels straight in the pixel portion and passes therethrough, and there is little chance of being absorbed by the luminescent nanocrystal particles. On the other hand, when the light-scattering particles are present in the same pixel part as the luminescent nanocrystal particles, the backlight light is scattered in all directions in the pixel part, and the luminescent nanocrystal particles can receive it. Even if the same backlight is used, it is considered that the light absorption amount in the pixel portion increases. As a result, it is considered possible to prevent light leakage by such a mechanism.

[Polymer dispersant]
The ink composition of one embodiment preferably contains a polymer dispersant. The polymer dispersant can uniformly disperse the light scattering particles in the ink.
In the present invention, the polymer dispersant is a polymer compound having a weight average molecular weight of 750 or more and having a functional group having an affinity for the light scattering particles, and has a function of dispersing the light scattering particles. Have. The polymer dispersant is that the polymer dispersant is adsorbed to the light-scattering particles via a functional group having an affinity for the light-scattering particles, and electrostatic repulsion and/or steric repulsion between the polymer dispersants, Light scattering particles are dispersed in the ink composition. The polymer dispersant is preferably bound to the surface of the light-scattering particles and adsorbed to the light-scattering particles, but is bound to the surface of the luminescent nanocrystal particles and adsorbed to the luminescent nanoparticles. It may also be free in the ink composition.

Examples of the functional group having an affinity for the light scattering particles include an acidic functional group, a basic functional group and a nonionic functional group. The acidic functional group has a dissociative proton and may be neutralized with a base such as an amine or a hydroxide ion.The basic functional group is neutralized with an acid such as an organic acid or an inorganic acid. May be.

The acidic functional group, a carboxyl group (-COOH), a sulfo group _(-SO 3 H), sulfuric acid group (-OSO ₃ H), a phosphonic acid group (-PO _{(OH) 3),} phosphoric acid group (-OPO ( OH) ₃ ), a phosphinic acid group (-PO(OH)-), and a mercapto group (-SH).

Examples of the basic functional group include primary, secondary and tertiary amino groups, ammonium groups, imino groups, and nitrogen-containing heterocyclic groups such as pyridine, pyrimidine, pyrazine, imidazole and triazole.

The nonionic functional group, hydroxy group, an ether group, a thioether group, a sulfinyl group (-SO-), a sulfonyl group _(-SO 2 -), a carbonyl group, a formyl group, an ester group, carbonic ester group, an amide group, Examples thereof include a carbamoyl group, a ureido group, a thioamide group, a thioureido group, a sulfamoyl group, a cyano group, an alkenyl group, an alkynyl group, a phosphine oxide group and a phosphine sulfide group.

From the viewpoint of the dispersion stability of the light-scattering particles, the viewpoint of preventing the side effect of the luminescent nanocrystalline particles from settling, the viewpoint of the ease of synthesizing the polymer dispersant, and the viewpoint of the stability of the functional group, an acidic functional group is used. A carboxyl group, a sulfo group, a phosphonic acid group and a phosphoric acid group are preferably used as the group, and an amino group is preferably used as the basic functional group. Among these, a carboxyl group, a phosphonic acid group and an amino group are more preferably used, and most preferably an amino group.

The polymer dispersant having an acidic functional group has an acid value. The acid value of the polymer dispersant having an acidic functional group is preferably 1 to 150 mgKOH/g in terms of solid content. When the acid value is 1 or more, sufficient dispersibility of the light-scattering particles is easily obtained, and when the acid value is 150 or less, the storage stability of the pixel portion (cured product of the ink composition) is less likely to decrease. ..

Further, the polymer dispersant having a basic functional group has an amine value. The amine value of the polymer dispersant having a basic functional group is preferably 1 to 200 mgKOH/g in terms of solid content. When the amine value is 1 or more, sufficient dispersibility of the light-scattering particles is easily obtained, and when the amine value is 200 or less, the storage stability of the pixel portion (cured product of the ink composition) is less likely to decrease. ..

The polymer dispersant may be a polymer of a single monomer (homopolymer) or a copolymer of a plurality of types of monomers. Further, the polymer dispersant may be any of a random copolymer, a block copolymer or a graft copolymer. When the polymer dispersant is a graft copolymer, it may be a comb-shaped graft copolymer or a star-shaped graft copolymer. The polymer dispersant is, for example, acrylic resin, polyester resin, polyurethane resin, polyamide resin, polyether, phenol resin, silicone resin, polyurea resin, amino resin, polyamine such as polyethyleneimine and polyallylamine, epoxy resin, polyimide, etc. You can

As the polymer dispersant, it is possible to use a commercially available product, and as the commercially available product, Ajinomoto Fine-Techno Co., Ltd., Addisper PB series, BYK's DISPERBYK series and BYK-series, BASF's Efka series are available. Etc. can be used.

Examples of commercially available products include "DISPERBYK-130", "DISPERBYK-161", "DISPERBYK-162", "DISPERBYK-163", "DISPERBYK-164", "DISPERBYK-166", and "DISPERBYK-" manufactured by Big Chemie. 167", "DISPERBYK-168", "DISPERBYK-170", "DISPERBYK-171", "DISPERBYK-174", "DISPERBYK-180", "DISPERBYK-182", "DISPERBYK-183", "DISPERBYK-184". , "DISPERBYK-185", "DISPERBYK-2000", "DISPERBYK-2001", "DISPERBYK-2008", "DISPERBYK-2009", "DISPERBYK-2020", "DISPERBYK-2022", "DISPERBYK-2025", "DISPERBYK-2025". "DISPERBYK-2050", "DISPERBYK-2070", "DISPERBYK-2096", "DISPERBYK-2150", "DISPERBYK-2155", "DISPERBYK-2163", "DISPERBYK-2164", "BYK-LPN21116" and "BYK". LPN6919";BASF's"EFKA4010","EFKA4015","EFKA4046","EFKA4047","EFKA4061","EFKA4080","EFKA4300","EFKA4320","EFKA4320","43","EFKA4320","EFK43","EFKA4320","EFK43","EFKA4320","EFK43","EFK4320","EFK4320","EFK4320","EFK4320", and "EFK4320". , "EFKA4560", "EFKA4585", "EFKA5207", "EFKA1501", "EFKA1502", "EFKA1503" and "EFKA PX-4701";Lubrizol's"Solspers3000","Solspers9000","Solspers13240". , "Solsperse 13650", "Solsperse 13940", "Solsperse 11200", "Solsperse 13940", "Solsperse 16000", "Solsperse 17,000", "Solsperse 18000", "Solspers 20000", "Solspers 21000", "Solspers 24000". , "Solspers 26000", "Solspers 27000", "Solspers 28000", "Solspers 32000" , "Solsperse 32500", "Solsperse 32550", "Solsperse 32600", "Solsperse 33000", "Solsperse 34750", "Solsperse 35100", "Solsperse 35200", "Solsperse 36000", "Solsperse 37500", "Solsperse 38500". , "Solsperse 39000", "Solsperse 41000", "Solsperse 54000", "Solsperse 71000" and "Solsperse 76500"; Ajinomoto Fine-Techno Co., Ltd. "Azisper PB821", "Azispar PB822", "Azispar PB881", "PN411. And PA
111"; manufactured by Evonik "TEGO Dispers 650", "TEGO Dispers 660C", "TEGO Dispers 662C", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670", "TEGO Dispers 670""DisparlonDA-703-50","DA-705","DA-725" and the like can be used.

As the polymer dispersant, in addition to the above commercial products, a cationic monomer having a basic group and/or an anionic monomer having an acidic group, a monomer having a hydrophobic group, and optionally other monomer It is possible to use those synthesized by copolymerization with (nonionic monomer, monomer having hydrophilic group, etc.). For details of the cationic monomer, anionic monomer, monomer having a hydrophobic group and other monomers, there can be mentioned the monomers described in paragraphs 0034 to 0036 of JP-A 2004-250502.

Further, for example, compounds obtained by reacting a polyalkyleneimine described in JP-A-54-37082 and JP-A-61-174939 with a polyester compound, and polyallylamine described in JP-A-9-169821 can be used. A compound in which an amino group of a side chain is modified with a polyester, a graft polymer having a polyester type macromonomer as a copolymerization component described in JP-A-9-171253, and a polyester polyol addition described in JP-A-60-166318. Suitable examples include polyurethane.

The weight average molecular weight of the polymer dispersant may be 750 or more, and may be 1,000 or more, from the viewpoint that the light-scattering particles can be favorably dispersed and the effect of reducing leakage light can be further improved. It may be 2000 or more, or 3000 or more. The weight-average molecular weight of the polymer dispersant can favorably disperse the light-scattering particles, can further improve the leakage light reduction effect, and can eject the viscosity of the inkjet ink, which is suitable for stable ejection. From the viewpoint of viscosity, it may be 100,000 or less, 50,000 or less, or 30,000 or less. In the present specification, the weight average molecular weight is a polystyrene equivalent weight average molecular weight measured by GPC (gel permeation chromatography, Gel Permeation Chromatography).

From the viewpoint of dispersibility of the light-scattering particles, the content of the polymer dispersant may be 0.5 parts by mass or more, and may be 2 parts by mass or more, based on 100 parts by mass of the light-scattering particles. It may be 5 parts by mass or more. The content of the polymer dispersion may be 50 parts by mass or less, and 30 parts by mass or less with respect to 100 parts by mass of the light scattering particles, from the viewpoint of wet heat stability of the pixel part (cured product of the ink composition). Or 10 parts by mass or less.

[Thermosetting resin]
In the present embodiment, the thermosetting resin is a resin that functions as a binder in a cured product and that is crosslinked and cured by heat. The thermosetting resin has a curable group. Examples of the curable group include an epoxy group, an oxetane group, an isocyanate group, an amino group, a carboxyl group, a methylol group, and the like, from the viewpoint of excellent heat resistance and storage stability of the cured product of the ink composition, and a light-shielding portion ( For example, an epoxy group is preferable from the viewpoint of excellent adhesion to a black matrix) and a substrate. The thermosetting resin may have one type of curable group, or may have two or more types of curable groups.

In addition, among thermosetting resins, a resin having photoradical polymerizability (polymerized by irradiation of light when used with a photoradical polymerization initiator) and a photocationic polymerizability (photocationic polymerization). Resins that polymerize by irradiation with light when used with an initiator).

The thermosetting resin may be a polymer of a single monomer (homopolymer) or a copolymer of a plurality of types of monomers. The thermosetting resin may be a random copolymer, a block copolymer or a graft copolymer.

As the thermosetting resin, a compound having two or more thermosetting functional groups in one molecule is used, and it is usually used in combination with a curing agent. When a thermosetting resin is used, a catalyst (curing accelerator) that can accelerate the thermosetting reaction may be further added. In other words, the ink composition may contain a thermosetting component containing a thermosetting resin (and a curing agent and a curing accelerator used as necessary). Further, in addition to these, a polymer which itself has no polymerization reactivity may be further used.

As the compound having two or more thermosetting functional groups in one molecule, for example, an epoxy resin having two or more epoxy groups in one molecule (hereinafter, also referred to as “multifunctional epoxy resin”) may be used. "Epoxy resin" includes both monomeric epoxy resins and polymeric epoxy resins. The number of epoxy groups contained in one molecule of the polyfunctional epoxy resin is preferably 2 to 50, more preferably 2 to 20. The epoxy group may be any structure having an oxirane ring structure, and may be, for example, a glycidyl group, an oxyethylene group, an epoxycyclohexyl group, or the like. As the epoxy resin, a known polyvalent epoxy resin that can be cured with a carboxylic acid can be mentioned. Such an epoxy resin is widely disclosed, for example, in "Epoxy Resin Handbook" edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun (1987), and these can be used.

Examples of the thermosetting resin having an epoxy group (including a polyfunctional epoxy resin) include a polymer of a monomer having an oxirane ring structure and a copolymer of a monomer having an oxirane ring structure and another monomer (for example, an acrylic monomer). Can be mentioned. Examples of the monomer include various epoxy group-containing monomers such as glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate, glycidyl vinyl ether, and allyl glycidyl ether; (2-oxo-1,3-oxolane) ) Vinyl monomers containing (2-oxo-1,3-oxolane) group such as methyl(meth)acrylate; 3,4-epoxycyclohexyl(meth)acrylate, 3,4-epoxycyclohexylmethyl(meth)acrylate , A variety of alicyclic epoxy group-containing vinyl monomers such as 3,4-epoxycyclohexylethyl (meth)acrylate.

On the other hand, examples of the ethylenically unsaturated double bond-containing monomer include various aromatic vinyls such as styrene, α-methylstyrene, and vinyltoluene; methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, Various acrylic acid esters; various methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate; ethylene, propylene, butene-1 , Various α-olefins; vinyl chloride, vinylidene chloride, various halogenated olefins other than fluoroolefins (halo olefins); dimethyl fumarate, diethyl fumarate, dibutyl fumarate, dioctyl fumarate And various unsaturated dicarboxylic acids such as dimethyl maleate, diethyl maleate, dibutyl maleate, dioctyl maleate, dimethyl itaconate, diethyl itaconate, dibutyl itaconate, dioctyl itaconate, and 1-18 carbon atoms Diesters with monohydric alcohols; vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl caproate, vinyl caprylate, vinyl caprate, vinyl laurate, branched with 9 carbon atoms (branched) Examples thereof include various aliphatic vinyl carboxylates such as aliphatic vinyl carboxylate, branched aliphatic vinyl carboxylate having 10 carbon atoms, branched aliphatic vinyl carboxylate having 11 carbon atoms, and vinyl stearate.

Specific polyfunctional epoxy resins include polyglycidyl methacrylate, methyl methacrylate-glycidyl methacrylate copolymer, benzyl methacrylate-glycidyl methacrylate copolymer, n-butyl methacrylate-glycidyl methacrylate copolymer, 2-hydroxyethyl methacrylate-glycidyl. Examples thereof include a methacrylate copolymer, a (3-ethyl-3-oxetanyl)methyl methacrylate-glycidyl methacrylate copolymer, and a styrene-glycidyl methacrylate copolymer. Further, as the thermosetting resin of the present embodiment, compounds described in paragraphs 0044 to 0066 of JP-A-2014-56248 can be used.

Such a homopolymer or copolymer of a monomer having an oxirane ring structure is preferably a two-dimensional (linear) copolymer from the viewpoint of easy handling and production. For example, without a solvent. Alternatively, in an organic solvent, glycidyl (meth)acrylate as an essential component, a known and commonly used copolymerizable ethylenically unsaturated monomer, such as aromatic vinyl or (meth)acrylic acid ester, is used. It can be obtained by polymerizing together a monomer containing one double bond and, if necessary, a monomer containing two or more ethylenically unsaturated double bonds. A copolymer having a desired epoxy group content can be obtained by adjusting the combined ratio of glycidyl (meth)acrylate and another ethylenically unsaturated monomer, and a copolymerizable ethylenically unsaturated monomer can be obtained. Depending on what kind of monomer is selected and used and the average molecular weight of the whole, the refractive index of the copolymer, glass transition temperature, flexibility, transparency, solubility in organic solvents, etc. Can be adjusted. The copolymerization ratio of a monomer containing an aromatic ring such as aromatic vinyl is, for example, the refractive index of the produced copolymer, and the alkyl chain length of the (meth)acrylic acid ester is the flexibility of the produced copolymer or the support. Affects adhesion to Such a copolymer is, for example, a known and commonly used copolymerizable ethylenically unsaturated monomer in an organic solvent having a specific LogP value range of the present invention described later, using the glycidyl (meth)acrylate as an essential component. Can also be easily obtained by performing polymerization until the desired molecular weight is obtained so that the glycidyl group does not ring-open. Of course, the copolymer may be prepared by carrying out in an organic solvent outside the specific LogP value range to be described later to replace the organic solvent on the left with an organic solvent within the specific LogP value range to be described later. ..

Examples of the polyfunctional epoxy resin include bisphenol A type epoxy resin, bisphenol F type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol S type epoxy resin, diphenyl ether type epoxy resin, hydroquinone type epoxy resin, naphthalene type epoxy resin. Resin, biphenyl type epoxy resin, fluorene type epoxy resin, phenol novolac type epoxy resin, orthocresol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, trifunctional epoxy resin, tetraphenylolethane type epoxy resin, dicyclopentadiene Phenol type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol A nucleus-containing polyol type epoxy resin, polypropylene glycol type epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, glyoxal type epoxy resin, alicyclic epoxy resin A heterocyclic epoxy resin can be used.

More specifically, bisphenol A type epoxy resin such as trade name "Epicoat 828" (manufactured by Japan Epoxy Resin Co., Ltd.), bisphenol F type epoxy resin such as trade name "YDF-175S" (manufactured by Toto Kasei Co., Ltd.), trade name Brominated bisphenol A type epoxy resin such as "YDB-715" (manufactured by Tohto Kasei Co., Ltd.), bisphenol S type epoxy resin such as trade name "EPICLON EXA1514" (manufactured by DIC Corporation), trade name "YDC-1312" ( Hydroquinone type epoxy resin such as Toto Kasei Co., Ltd., naphthalene type epoxy resin such as trade name "EPICLON EXA4032", "HP-4770", "HP-4700", "HP-5000" (manufactured by DIC Corporation), Biphenyl type epoxy resin such as trade name "Epicoat YX4000H" (manufactured by Japan Epoxy Resin Co.), bisphenol A type novolac epoxy resin such as trade name "Epicoat 157S70" (manufactured by Japan Epoxy Resin Co., Ltd.), trade name "Epicoat 154" ( Japan Epoxy Resin Co., Ltd.), phenolic novolac type epoxy resin such as trade name “YDPN-638” (Toto Kasei Co.), cresol novolac type epoxy resin such as trade name “YDCN-701” (Toto Kasei Co., Ltd.), product Dicyclopentadiene phenol type epoxy resin such as name "EPICLON HP-7200", "HP-7200H" (manufactured by DIC Corporation), trishydroxyphenylmethane type such as trade name "Epicoat 1032H60" (manufactured by Japan Epoxy Resin Co., Ltd.) Epoxy resin, trifunctional epoxy resin such as trade name "VG3101M80" (manufactured by Mitsui Chemicals, Inc.), tetraphenylolethane epoxy resin such as trade name "Epicoat 1031S" (manufactured by Japan Epoxy Resins Co., Ltd.), trade name "Denacol EX -411" (manufactured by Nagase Chemical Industry Co., Ltd.) and the like, hydrogenated bisphenol A type epoxy resin such as trade name "ST-3000" (manufactured by Toto Kasei Co., Ltd.), trade name "Epicoat 190P" (Japan Epoxy) Glycidyl ester type epoxy resin such as resin), glycidyl amine type epoxy resin such as trade name “YH-434” (manufactured by Toto Kasei Co., Ltd.) and glyoxal type epoxy resin such as product name “YDG-414” (manufactured by Toto Kasei Co., Ltd.) Epoxy resin, alicyclic polyfunctional epoxy compound such as trade name "Epolide GT-401" (manufactured by Daicel Chemical Industries, Ltd.), triglycidyl isocyanate (TGI Examples thereof include heterocyclic epoxy resins such as C). If necessary, a trade name "Neo Tote E" (manufactured by Toto Kasei Co., Ltd.) or the like can be mixed as an epoxy reactive diluent.

Moreover, as a multifunctional epoxy resin, "Fine Dick A-247S", "Fine Dick A-254", "Fine Dick A-253", "Fine Dick A-229-30A", and "Fine Dick A-229S" manufactured by DIC Corporation. "Fine Dick A-261", "Fine Dick A249", "Fine Dick A-266", "Fine Dick A-241", "Fine Dick M-8020", "Epiclon N-740", "Epiclone N-770", "Epiclon N-865" (trade name) or the like can be used.

When a polyfunctional epoxy resin having a relatively small molecular weight is used as the thermosetting resin, the epoxy group is replenished in the ink composition (inkjet ink) to increase the reaction point concentration of the epoxy and increase the crosslinking density. it can.

Among the polyfunctional epoxy resins, it is preferable to use an epoxy resin having four or more epoxy groups in one molecule (a polyfunctional epoxy resin having four or more functional groups) from the viewpoint of increasing the crosslink density. In particular, when a thermosetting resin having a weight average molecular weight of 10,000 or less is used in order to improve the ejection stability from the ejection head in the inkjet method, the strength and hardness of the pixel portion (cured product of the ink composition) decrease. Since it is easy to do so, from the viewpoint of sufficiently increasing the crosslink density, it is preferable to add a tetrafunctional or higher-functional polyfunctional epoxy resin to the ink composition (inkjet ink).

As a thermosetting resin having an epoxy group, a multi-component copolymer of a monomer having an oxirane ring structure and another monomer is less colored and is excellent in transparency, and the crosslink density is increased, which is excellent in chemical resistance and flexibility. From the viewpoint of easily obtaining a cured product having such advantages, it is preferable as compared with other polyfunctional epoxy resins. The excellent optical properties and film physical properties of such a cured product have been shown to be suitable for use in optical materials, particularly for light conversion layers expected to have long-term reliability.

As the curing agent and curing accelerator used for curing the thermosetting resin, any of the known conventional ones that can be dissolved or dispersed in the above-mentioned organic solvent can be used, and for example, 4-methylhexahydro Phthalic anhydride, triethylenetetramine, diaminodiphenylmethane, phenol novolac resin, tris(dimethylaminomethyl)phenol, N,N-dimethylbenzylamine, 2-ethyl-4-methylimidazole, triphenylphosphine, 3-phenyl-1 , 1-dimethylurea and the like.

Among them, compared with polymers such as phenol novolac resin, they are liquid at room temperature or have excellent solubility in the organic solvents mentioned above and can have low viscosity, making it easier to cure at lower temperature and in shorter time. Therefore, it is preferable to use a low-molecular curing agent and a curing accelerator that cause less coloring of the cured product.

The thermosetting resin may be insoluble in alkali from the viewpoint of easily obtaining a color filter pixel portion having excellent reliability. The thermosetting resin being insoluble in alkali means that the amount of the thermosetting resin dissolved in a 1% by mass potassium hydroxide aqueous solution at 25° C. is 30% by mass or less based on the total mass of the thermosetting resin. Means that. The dissolution amount of the thermosetting resin is preferably 10% by mass or less, more preferably 3% by mass or less.

The weight average molecular weight of the thermosetting resin is such that an appropriate viscosity is easily obtained as an inkjet ink, that the curability of the ink composition is good, and that the solvent resistance of the pixel portion (cured product of the ink composition) is high. Also, from the viewpoint of improving the wear resistance, it may be 750 or more, 1000 or more, and 2000 or more. From the viewpoint of obtaining an appropriate viscosity as an inkjet ink, the viscosity may be 500000 or less, 300000 or less, or 200000 or less. However, this does not apply to the molecular weight after crosslinking.

The content of the thermosetting resin is such that an appropriate viscosity can be easily obtained as an inkjet ink, that the curability of the ink composition is good, and that the solvent resistance of the pixel portion (cured product of the ink composition) and From the viewpoint of improving abrasion resistance, the amount may be 10% by mass or more, 15% by mass or more, or 20% by mass or more, based on the mass of the nonvolatile content of the ink composition. The content of the thermosetting resin, the viscosity of the inkjet ink does not become too high, from the viewpoint that the thickness of the pixel portion does not become too thick for the light conversion function, based on the mass of the nonvolatile content of the ink composition, It may be 90 mass% or less, 80 mass% or less, 70 mass% or less, 60 mass% or less, or 50 mass% or less.

[Organic solvent]
The organic solvent in the present invention is an organic solvent having a specific LogP value range described later.
Examples of the organic solvent contained in the ink composition of the present invention include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, and dimethyl malonate. , Diethyl malonate, dimethyl succinate, diethyl succinate, 1,4-butane-all diacetate, glyceryl triacetate and the like.

The boiling point of the organic solvent is preferably 180° C. or higher from the viewpoint of continuous ejection stability of the inkjet ink. Further, since it is necessary to remove the solvent from the ink composition before the ink composition is cured when forming the pixel portion, the boiling point of the solvent is preferably 300° C. or less from the viewpoint of easily removing the solvent.

In the present invention, an organic solvent is used from the viewpoint of preparing the ink composition to be uniform, and from the viewpoint of increasing the fluidity of the ink composition and forming the color filter pixel portion (light conversion layer) with less unevenness. Is preferably used.

[LogP value]
The ink composition of the present invention is most characterized by using an organic solvent having a specific LogP value range. For example, an organic solvent in the specific LogP value range is selected from the organic solvents exemplified above. Can be used as an essential component. By using such an organic solvent having a specific LogP value range, in the present invention, it is possible to make the cured product of the ink composition less likely to cause defects. In the present invention, the log P value represents the logarithmic value of the partition coefficient of 1-octanol/water of an organic solvent, and is “Journal of Pharmaceutical Sciences, page 83, volume 84, No. 1, 1995” (WILLIAM M. MEYLAN). , PHILIP H. HOWARD)). The logP value is a numerical value generally used for relative evaluation of hydrophilicity/hydrophobicity of organic compounds.

For example, it is calculated as follows.
1,4-butanediol diacetate 1.39
Tetralin 3.27
LDO 1.35
OXT-221 2.02
Ethylene glycol-1.61
n-lauryl methacrylate 6.68

Incidentally, the logarithmic value of the partition coefficient of 1-octanol/water can be measured based on JIS Z 7260-117, but the value obtained by the above calculation method shows a very good correlation among many measured results. The above is shown in the above-mentioned document.

In the ink composition of the present invention, in particular, in the ink composition for inkjet, the LogP value of the organic solvent is −1.0 or more and 6.5 or less, and if necessary, the technical effect of the present invention is not impaired. In the range, the LogP value may contain an organic solvent outside this range.
The LogP value of the organic solvent is 5.0 or less, may be 4.0 or less, may be 3.0 or less, and may be 2.0 or less in terms of suppressing deterioration of the luminescent nanocrystals due to water. May be: Further, from the viewpoint of suppressing the water absorption of the ink composition containing the luminescent nanocrystal, it may be −0.5 or more, may be 0.0 or more, and may be 1.0 or more.
When the LogP value contains an organic solvent outside the range of -1.0 or more and 6.5 or less in the above range, the organic solvent suppresses deterioration of the luminescent nanocrystals due to oxygen and moisture in the atmosphere, It may be 30% by mass or less, 20% by mass or less, 10% by mass, 5% by mass or less, or 2% by mass or less in the ink.

Since the ink composition of the present invention is a thermosetting ink composition using a thermosetting resin, it is possible to suppress deterioration of the luminescent nanocrystalline particles due to photocuring, for example.

The ink composition of the present embodiment can be applied as an ink used in a known method for producing a color filter, but without wasting materials such as relatively expensive luminescent nanocrystal particles and a solvent. The color filter pixel portion (light conversion layer) can be formed only by using a required amount in a required portion, and thus it should be appropriately prepared and used so as to be more suitable for an inkjet method than a photolithography method. preferable.

The viscosity of the ink composition may be, for example, 2 mPa·s or more, 5 mPa·s or more, or 7 mPa·s or more, from the viewpoint of ejection stability during inkjet printing. The viscosity of the ink composition may be 20 mPa·s or less, 15 mPa·s or less, or 12 mPa·s or less. When the viscosity of the ink composition is 2 mPa·s or more, the meniscus shape of the ink composition at the tip of the ink ejection hole of the ejection head becomes stable, and therefore ejection control of the ink composition (for example, ejection amount and ejection timing) is performed. Control) becomes easy. On the other hand, when the viscosity is 20 mPa·s or less, the ink composition can be smoothly ejected from the ink ejection holes. The viscosity of the ink composition is 2 to 20 mPa·s, 2 to 15 mPa·s, 2 to 12 mPa·s, 5 to 20 mPa·s, 5 to 15 mPa·2 to 20 mPa·s, 7 to 15 mPa·s, and 7 to 12 mPa. -S, s, or 7-12 mPa*s may be sufficient. The viscosity of the ink composition is measured by, for example, an E-type viscometer.

The surface tension of the ink composition is preferably a surface tension suitable for an inkjet method, specifically, it is preferably in the range of 20 to 40 mN/m, and more preferably 25 to 35 mN/m. .. By setting the surface tension within this range, it is possible to suppress the occurrence of flight bending. The flight curve means that when the ink composition is ejected from the ink ejection holes, the landing position of the ink composition deviates from the target position by 30 μm or more. When the surface tension is 40 mN/m or less, the meniscus shape at the tip of the ink ejection hole becomes stable, which facilitates ejection control of the ink composition (for example, control of ejection amount and ejection timing). On the other hand, when the surface tension is 20 mN/m or less, the occurrence of flight bending can be suppressed. That is, a pixel portion in which the ink composition is not accurately landed and the ink composition is not sufficiently filled occurs in the pixel portion formation area to be landed, or a pixel portion formation area (or a pixel portion) adjacent to the pixel portion formation area to be landed. The ink composition does not land on the surface and the color reproducibility does not deteriorate.

The ink composition further contains components other than the luminescent nanocrystalline particles, the light-scattering particles, the thermosetting resin, the polymer dispersant, and the organic ligand, as long as the effect of the present invention is not impaired. Good. Examples of other components include a photopolymerizable compound, a polymerization initiator, and a sensitizer.

[Water content]
In the ink composition of the present invention, the water content of the ink composition can be measured by a Karl Fischer moisture meter (for example, Mitsubishi Chemical Corporation model number CA-06, vaporization unit VA-06). The water content in the ink composition may be 90 ppm or less, 50 ppm or less, 20 ppm or less, 9 ppm or less, or 4 ppm or less from the viewpoint of suppressing deterioration of the luminescent nanocrystals. May be 2 ppm or less, and may be 1 ppm or less.

In the ink composition of the present invention, when the organic solvent having a specific LogP value range is used and the water content is within the above range, a cured product is less likely to cause a defect, and deterioration of the luminescent nanocrystals is further suppressed. It is more preferable from the viewpoint that it can be effectively suppressed. In the case of an inkjet ink composition, the best technical effect can be expected in combination with the ejection method.

In the present invention, the water content of the ink composition raw material such as the ink composition and the organic solvent can be controlled within the above-mentioned specific content value range by the following method. For example, an ink composition is prepared using an organic solvent dehydrated by adding molecular sieves, or molecular sieves is added to a mixture of a thermosetting resin and an organic solvent, and molecular sieves are added to the ink composition and filtered after dehydration. Is the way to do it. If necessary, the filtration as shown on the left may not be performed.

The dehydration treatment time is not particularly limited, but it takes time for the molecular sieves to adsorb the water molecules contained in the ink composition raw material such as the ink composition and the organic solvent, so after adding the molecular sieves. It may be dehydrated for 12 hours or longer, may be dehydrated for 24 hours or longer, and may be dehydrated for 48 hours or longer. At this time, it may be in an air atmosphere, but it is preferable to perform the dehydration treatment in an inert gas atmosphere in which water is substantially absent. The molecular sieves used are preferably used after removing adsorbed water by heat treatment or the like before use, and the heating temperature may be 200°C or higher, 250°C or higher, and 300°C or higher. The temperature may be 350° C. or higher. Depressurization during heating is also preferable from the viewpoint of removing adsorbed water molecules, and may be 0.1 mmHg or less, 0.01 mmHg, or 0.001 mmHg or less.
Solid raw materials such as light-scattering particles may adsorb water molecules and thus may be dehydrated before use, and may be heated in the air or under an inert gas atmosphere or under reduced pressure to remove water. ..

Since water dissolves in a liquid under the atmosphere, the ink composition raw material may be dehydrated before the ink composition is prepared, or the ink composition may be prepared without dehydrating the ink composition raw material. The ink composition may be dehydrated. The ink composition may be further dehydrated after preparing the ink composition after dehydrating each of the ink composition raw materials. By performing the dehydration operation more rigorously, the cured product is less likely to cause defects, and the deterioration of the luminescent nanocrystals can be more reliably suppressed.

[Dissolved oxygen concentration]
In one embodiment, the dissolved oxygen concentration of the ink composition raw material such as the ink composition or the organic solvent can be reduced by exposing the ink or the organic solvent to a stream of an inert gas such as nitrogen or argon, or by blowing an inert gas. Even for solid raw materials such as light-scattering particles, it is possible to prevent oxygen from being mixed into the ink composition by filling the interior of the container with a nitrogen stream and storing it in a nitrogen atmosphere.

The dissolved oxygen concentration is a value obtained by measuring the dissolved oxygen of the ink composition using a dissolved oxygen concentration meter having an optical and solvent resistance. Specifically, for example, Visiferm manufactured by Hamilton is used to measure the dissolved oxygen concentration of the ink composition. Dissolved oxygen concentration can be measured. Note that it is possible to reduce the dissolved oxygen concentration below the measurable lower limit of the apparatus for measuring the dissolved oxygen concentration, and this case is also an embodiment of the present invention.

[Deoxidizer]
The ink composition according to one embodiment may contain an oxygen scavenger, and the oxygen scavenger may be one that reacts with dissolved oxygen to reduce the oxygen concentration. For example, L-ascorbic acid, erythorbic acid, gallic acid, and These salts, pyrogallol, guarcetophenone, etc. are mentioned.
In the present invention, the content of the oxygen scavenger in the ink composition may be 0.01% by mass or more, and is 0.1% by mass or more, from the viewpoint of suppressing deterioration of the luminescent nanocrystals. May be 0.5% by mass or more, may be 1% by mass or more, and may be 30% by mass or less and may be 20% by mass or less from the viewpoint of avoiding coloring of the ink cured film. It may be 10% by mass or less and 5% by mass or less.

Since the method for removing the dissolved gas from the ink composition is simpler, a method of introducing an inert gas such as nitrogen gas into the ink composition to remove the dissolved gas containing dissolved oxygen, or the ink composition It is preferable to adopt a method of reducing the pressure of the substance.
It should be noted that by performing a combination of the method of removing the dissolved gas containing dissolved oxygen in the ink composition described above and the method of dehydrating the ink composition described above, both the dissolved gas concentration and the water concentration are low. It is more preferable from the viewpoint that the composition can be prepared and the problems of the cured product and the deterioration of the luminescent nanocrystals can be suppressed more effectively.

Although one embodiment of the color filter ink composition has been described above, the ink composition of the above-described embodiment can also be used in, for example, a photolithography method in addition to the inkjet method. In this case, the ink composition contains an alkali-soluble resin as the binder polymer.

When the ink composition is used in a photography system, first, the ink composition is applied onto a substrate, and when the ink composition contains a solvent, the ink composition is further dried to form a coating film. The coating film thus obtained is soluble in an alkali developing solution and is patterned by being treated with the alkali developing solution. At this time, most of the alkaline developing solution is an aqueous solution from the viewpoint of easiness of treating the waste solution of the developing solution and the like, so that the coating film of the ink composition is treated with the aqueous solution. On the other hand, in the case of the ink composition using the luminescent nanocrystal particles (quantum dots, etc.), the luminescent nanocrystal particles are unstable to water, and the luminescent property (for example, fluorescence) is impaired by water. For this reason, in the present embodiment, the inkjet method, which does not require treatment with an alkaline developer (aqueous solution), is preferable.

Even when the coating film of the ink composition is not treated with an alkali developing solution, when the ink composition is alkali-soluble, the coating film of the ink composition easily absorbs moisture in the air, and As time elapses, the light emitting property (eg, fluorescence) of the light emitting nanocrystalline particles (quantum dots etc.) is impaired. From this viewpoint, in the present embodiment, the coating film of the ink composition is preferably alkali-insoluble. That is, the ink composition of the present embodiment is preferably an ink composition capable of forming an alkali-insoluble coating film. Such an ink composition can be obtained by using an alkali-insoluble thermosetting resin as the thermosetting resin. The coating film of the ink composition is alkali-insoluble means that the dissolution amount of the coating film of the ink composition at 25° C. in a 1% by mass aqueous potassium hydroxide solution is based on the total mass of the coating film of the ink composition. It means that it is 30 mass% or less. The dissolved amount of the coating film of the ink composition is preferably 10% by mass or less, more preferably 3% by mass or less. It should be noted that the fact that the ink composition is an ink composition capable of forming an alkali-insoluble coating film means that after the ink composition is applied onto a substrate, it is dried at 80° C. for 3 minutes when a solvent is contained. This can be confirmed by measuring the amount of dissolution of the obtained coating film having a thickness of 1 μm.

<Method for producing ink composition>
Next, a method for producing the ink composition of the above-described embodiment will be described. The method for producing an ink composition includes, for example, a first step of preparing a dispersion of light-scattering particles containing a light-scattering particle and a polymer dispersant, and a dispersion of light-scattering particles and a luminescent nanoparticle. A second step of mixing the crystal particles. In this method, the dispersion of light-scattering particles may further contain a thermosetting resin and an organic solvent having a specific LogP value range as described above as essential components. In the second step, the thermosetting resin May be further mixed. According to this method, the light scattering particles can be sufficiently dispersed. Therefore, it is possible to easily obtain the ink composition capable of reducing the leakage light in the pixel portion.

In the step of preparing a dispersion of light-scattering particles, the light-scattering particles, the polymer dispersant, and optionally a thermosetting resin are mixed, and a dispersion treatment is performed to disperse the light-scattering particles. May be prepared. The mixing and dispersing treatment may be carried out using a dispersing device such as a bead mill, a paint conditioner, a planetary stirrer. It is preferable to use a bead mill or a paint conditioner from the viewpoint that the dispersibility of the light-scattering particles becomes good and the average particle diameter of the light-scattering particles can be easily adjusted to a desired range.

The method for producing an ink composition may further include, before the second step, a step of preparing a dispersion of luminescent nanocrystalline particles containing luminescent nanocrystalline particles and a thermosetting resin. Good. In this case, in the second step, the dispersion of light-scattering particles and the dispersion of luminescent nanocrystal particles are mixed. According to this method, the luminescent nanocrystal particles can be sufficiently dispersed. Therefore, it is possible to easily obtain the ink composition capable of reducing the leakage light in the pixel portion. In the step of preparing the dispersion of luminescent nanocrystal particles, the same dispersion device as in the step of preparing the dispersion of light-scattering particles is used to mix and disperse the luminescent nanocrystal particles and the thermosetting resin. Processing may be performed.

The ink composition thus obtained is prepared so as to have a specific moisture content as described above.

When the ink composition of the present embodiment is used as an ink composition for an ink jet system, it is preferably applied to a piezo jet system ink jet recording apparatus having a mechanical ejection mechanism using a piezoelectric element. In the piezo jet method, the ink composition is not instantaneously exposed to high temperature upon ejection, the quality of the luminescent nanocrystalline particles is unlikely to change, and the color filter pixel section (light conversion layer) also has the expected luminescent characteristics. Is easier to obtain.

<Light conversion layer and color filter>
Next, details of the light conversion layer and the color filter using the ink composition of the above-described embodiment will be described with reference to the drawings. In the following description, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

FIG. 1 is a schematic cross-sectional view of a color filter of one embodiment. As shown in FIG. 1, the color filter 100 includes a base material 40 and a light conversion layer 30 provided on the base material 40. The light conversion layer 30 includes a plurality of pixel units 10 and a light shielding unit 20.

The light conversion layer 30 has, as the pixel unit 10, a first pixel unit 10a, a second pixel unit 10b, and a third pixel unit 10c. The first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c are arranged in a grid pattern so as to be repeated in this order. The light-shielding portion 20 is provided between adjacent pixel portions, that is, between the first pixel portion 10a and the second pixel portion 10b, between the second pixel portion 10b and the third pixel portion 10c, and the third light-shielding portion. Is provided between the pixel portion 10c and the first pixel portion 10a. In other words, these adjacent pixel units are separated by the light shielding unit 20.

The first pixel portion 10a and the second pixel portion 10b each include a cured product of the ink composition of the above-described embodiment. The cured product contains luminescent nanocrystalline particles, light scattering particles, and a curing component. The curable component is a cured product of a thermosetting resin, specifically, a cured product obtained by crosslinking the thermosetting resin. That is, the first pixel portion 10a includes the first curable component 13a and the first luminescent nanocrystalline particles 11a and the first light-scattering particles 12a dispersed in the first curable component 13a. Including. Similarly, the second pixel portion 10b includes a second curing component 13b, and second luminescent nanocrystal particles 11b and second light scattering particles 12b dispersed in the second curing component 13b. including. In the first pixel portion 10a and the second pixel portion 10b, the first curing component 13a and the second curing component 13b may be the same or different, and the first light scattering particles 12a and It may be the same as or different from the second light scattering particles 12b.

The first luminescent nanocrystalline particles 11a are red luminescent nanocrystalline particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having an emission peak wavelength in the range of 605 to 665 nm. That is, the first pixel unit 10a may be restated as a red pixel unit for converting blue light into red light. The second luminescent nanocrystalline particles 11b are green luminescent nanocrystalline particles that absorb light having a wavelength in the range of 420 to 480 nm and emit light having an emission peak wavelength in the range of 500 to 560 nm. That is, the second pixel portion 10b may be restated as a green pixel portion for converting blue light into green light.

The content of the luminescent nanocrystalline particles in the pixel portion containing the cured product of the ink composition is 5% by mass or more based on the total mass of the cured product of the ink composition from the viewpoint of being more excellent in the effect of reducing leakage light. 10% by mass or more, 15% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more Good. The content of the luminescent nanocrystalline particles may be 70% by mass or less, or even 60% by mass or less, based on the total mass of the cured product of the ink composition, from the viewpoint of excellent reliability of the pixel portion. It may be 55% by mass or less, or may be 50% by mass or less.

The content of the light-scattering particles in the pixel portion containing the cured product of the ink composition is 0.1% by mass or more based on the total mass of the cured product of the ink composition from the viewpoint of being more excellent in the leakage light reducing effect. 1% by mass or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, 12% by mass or more May be. The content of the light-scattering particles may be 60% by mass or less based on the total mass of the cured product of the ink composition, from the viewpoint of more excellent leakage light reduction effect and the reliability of the pixel portion. 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, It may be 15% by mass or less. The content of the light-scattering particles is 0.1 to 60% by mass, 0.1 to 50% by mass, 0.1 to 40% by mass, and 0.1 to 0.1% by mass based on the total mass of the cured product of the ink composition. 30% by mass, 0.1 to 25% by mass, 0.1 to 20% by mass, 0.1 to 15% by mass, 1 to 60% by mass, 1 to 50% by mass, 1 to 40% by mass, 1 to 30% by mass %, 1 to 25% by mass, 1 to 20% by mass, 1 to 15% by mass, 5 to 60% by mass, 5 to 50% by mass, 5 to 40% by mass, 5 to 30% by mass, 5 to 25% by mass, 5-20 mass%, 5-15 mass%, 7-60 mass%, 7-50 mass%, 7-40 mass%, 7-30 mass%, 7-25 mass%, 7-20 mass%, 7- 15% by mass, 10-60% by mass, 10-50% by mass, 10-40% by mass, 10-30% by mass, 10-25% by mass, 10-20% by mass, 10-15% by mass, 12-60% by mass %, 12 to 50% by mass, 12 to 40% by mass, 12 to 30% by mass, 12 to 25% by mass, 12 to 20% by mass, or 12 to 15% by mass.

The third pixel unit 10c has a transmittance of 30% or more for light having a wavelength in the range of 420 to 480 nm. Therefore, the 3rd pixel part 10c functions as a blue pixel part, when using the light source which emits the light of the wavelength of the range of 420-480 nm. The 3rd pixel part 10c contains the hardened|cured material of the composition containing the above-mentioned thermosetting resin, for example. The cured product contains the third curing component 13c. The third curing component 13c is a cured product of a thermosetting resin, specifically, a cured product obtained by crosslinking the thermosetting resin. That is, the 3rd pixel part 10c contains the 3rd hardening component 13c. When the third pixel portion 10c contains the above-mentioned cured product, the composition containing the thermosetting resin has the above-mentioned ink composition as long as the transmittance for light having a wavelength in the range of 420 to 480 nm is 30% or more. Among the components contained in the composition, components other than the thermosetting resin may be further contained. The transmittance of the third pixel unit 10c can be measured by a microspectroscope.

The thickness of the pixel portion (the first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c) is, for example, 1 μm or more, 2 μm or more, or 3 μm or more. May be. The thickness of the pixel portion (the first pixel portion 10a, the second pixel portion 10b, and the third pixel portion 10c) may be, for example, 30 μm or less, 20 μm or less, and 15 μm or less. May be.

The light shielding unit 20 is a so-called black matrix provided for the purpose of separating adjacent pixel units from each other to prevent color mixing and to prevent light leakage from the light source. The material forming the light shielding portion 20 is not particularly limited, and in addition to a metal such as chromium, a resin composition containing a binder polymer containing light shielding particles such as carbon fine particles, metal oxides, inorganic pigments and organic pigments is cured. The thing etc. can be used. As the binder polymer used here, one or a mixture of two or more resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose, a photosensitive resin, O/W An emulsion type resin composition (for example, an emulsion of reactive silicone) can be used. The thickness of the light shielding portion 20 may be, for example, 0.5 μm or more and 10 μm or less.

The base material 40 is a transparent base material having a light-transmitting property, and is, for example, a transparent glass substrate such as quartz glass, Pyrex (registered trademark) glass, a synthetic quartz plate, a transparent resin film, an optical resin film, or the like. A flexible substrate or the like can be used. Among these, it is preferable to use a glass substrate made of alkali-free glass containing no alkali component in the glass. Specifically, "7059 glass", "1737 glass", "Eagle 200" and "Eagle XG" manufactured by Corning, "AN100" manufactured by Asahi Glass Co., Ltd., "OA-10G" and "Nippon Electric Glass Co., Ltd." OA-11" is preferred. These are materials having a small coefficient of thermal expansion and are excellent in dimensional stability and workability in high temperature heat treatment.

The color filter 100 including the light conversion layer 30 described above is preferably used when a light source that emits light having a wavelength in the range of 420 to 480 nm is used.

In the color filter 100, for example, after the light-shielding portion 20 is formed in a pattern on the base material 40, the ink composition (of the above-described embodiment is provided in the pixel portion formation region partitioned by the light-shielding portion 20 on the base material 40. It can be produced by a method of selectively adhering (inkjet ink) by an inkjet method and curing the ink composition by irradiation with active energy rays or heating.

The method of forming the light shielding portion 20 is performed by forming a metal thin film of chromium or a resin composition thin film containing light shielding particles in a region serving as a boundary between a plurality of pixel portions on one surface side of the base material 40. Then, a method of patterning this thin film can be used. The metal thin film can be formed by, for example, a sputtering method, a vacuum deposition method, or the like, and the thin film of the resin composition containing the light shielding particles can be formed by, for example, a coating method, a printing method, or the like. As a method for patterning, a photolithography method and the like can be mentioned.

Examples of the inkjet method include a bubble jet (registered trademark) method using an electrothermal converter as an energy generating element, a piezo jet method using a piezoelectric element, and the like.

When the ink composition is cured by irradiation with active energy rays (for example, ultraviolet rays), for example, a mercury lamp, a metal halide lamp, a xenon lamp, an LED or the like may be used. The wavelength of the irradiation light may be, for example, 200 nm or more and 440 nm or less. The exposure dose may be, for example, 10 mJ/cm ² or more and 4000 mJ/cm ² or less.

When the ink composition is cured by heating, the heating temperature may be, for example, 110° C. or higher and 250° C. or lower. The heating time may be, for example, 10 minutes or more and 120 minutes or less.

Although one embodiment of the color filter, the light conversion layer, and the manufacturing method thereof has been described above, the present invention is not limited to the above embodiment.

For example, the light conversion layer may be used in place of the third pixel portion 10c or in addition to the third pixel portion 10c, and a pixel portion (including a cured product of an ink composition containing blue light-emitting nanocrystalline particles). A blue pixel portion) may be provided. Further, the light conversion layer may include a pixel portion (for example, a yellow pixel portion) containing a cured product of an ink composition containing nanocrystal particles that emit light of a color other than red, green, and blue. In these cases, it is preferable that each of the luminescent nanocrystalline particles contained in each pixel portion of the light conversion layer has an absorption maximum wavelength in the same wavelength range.

Further, at least a part of the pixel portion of the light conversion layer may contain a cured product of a composition containing a pigment other than the luminescent nanocrystalline particles.

Further, the color filter may include an ink repellent layer made of a material having an ink repellent property having a width narrower than that of the light shielding part, on the pattern of the light shielding part. Further, instead of providing an ink repellent layer, a photocatalyst containing layer as a wettability variable layer is formed in a solid coating in a region including a pixel portion forming region, and then light is applied to the photocatalyst containing layer through a photomask. It is also possible to irradiate and perform exposure to selectively increase the ink affinity of the pixel portion formation region. Examples of the photocatalyst include titanium oxide.

Further, the color filter may include an ink receiving layer containing hydroxypropyl cellulose or the like between the base material and the pixel portion.

Further, the color filter may include a protective layer on the pixel portion. This protective layer flattens the color filter and prevents the components contained in the pixel portion or the components contained in the pixel portion and the photocatalyst containing layer from being eluted into the liquid crystal layer. It is provided. As a material forming the protective layer, a material used as a known protective layer for a color filter can be used.

Further, in manufacturing the color filter and the light conversion layer, the pixel portion may be formed by a photolithography method instead of the inkjet method. In this case, first, the ink composition is applied to the substrate in layers to form an ink composition layer. Next, the ink composition layer is exposed in a pattern and then developed with a developer. In this way, a pixel portion made of a cured product of the ink composition is formed. Since the developer is usually alkaline, an alkali-soluble polymer is used as the binder polymer. However, from the viewpoint of material usage efficiency, the inkjet method is superior to the photolithography method. This is because, in principle, the photolithography method removes almost 2/3 or more of the material, and the material is wasted. Therefore, in the present embodiment, it is preferable to use the inkjet ink to form the pixel portion by the inkjet method.

In addition to the above-mentioned luminescent nanocrystal particles, the pixel portion of the light conversion layer of the present embodiment may further contain a pigment having substantially the same color as the luminescent color of the luminescent nanocrystal particles. For example, when a pixel portion containing luminescent nanocrystal particles that absorbs blue light and emits light is used as the pixel portion of the liquid crystal display element, blue light or quasi-white light having a peak at 450 nm is emitted from the light source. However, if the concentration of the luminescent nanocrystalline particles in the pixel portion is not sufficient, the light from the light source will pass through the light conversion layer when the liquid crystal display element is driven. The transmitted light (blue light, leaked light) from this light source and the light emitted by the luminescent nanocrystalline particles are mixed. From the viewpoint of preventing the deterioration of color reproducibility due to the occurrence of such color mixture, a pigment may be contained in the pixel portion of the light conversion layer. Since the pigment is contained in the pixel portion, the ink composition may contain the pigment.

In addition, one or two of the red pixel portion (R), the green pixel portion (G), and the blue pixel portion (B) in the light conversion layer of the present embodiment do not contain the luminescent nanocrystal particles. It may be a pixel portion containing a coloring material. As the coloring material that can be used here, a known coloring material can be used. For example, as the coloring material used in the red pixel portion (R), a diketopyrrolopyrrole pigment and/or an anionic red organic dye can be used. Can be mentioned. Examples of the coloring material used for the green pixel portion (G) include at least one selected from the group consisting of copper halide phthalocyanine pigments, phthalocyanine green dyes, and a mixture of a phthalocyanine blue dye and an azo yellow organic dye. Examples of the coloring material used in the blue pixel portion (B) include an ε-type copper phthalocyanine pigment and/or a cationic blue organic dye. When used in the light conversion layer, the amount of these coloring materials used is 1 to 5 masses based on the total mass of the pixel portion (cured product of the ink composition) from the viewpoint of preventing a decrease in transmittance. % Is preferable.

Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the following examples.

The operation for producing the luminescent nanocrystals and the operation for producing the ink described below were carried out in a glove box filled with nitrogen or in a flask under a nitrogen stream with the atmosphere shut off.
Further, all the raw materials exemplified below were used by replacing the atmosphere in the container with nitrogen gas by introducing nitrogen gas into the container in advance. As for the liquid material, nitrogen gas was introduced into the liquid to replace the dissolved oxygen with nitrogen gas.
In addition, chloroform, ethanol, hexane, toluene, and 1,4-butanediol diacetate used below are molecular sieves (basically 3A is used, and hexane, toluene, butanediol diacetate are 4A) in advance with 48 molecular sieves. What was dehydrated and dried for a period of time or longer was used.
Before use, titanium oxide was heated at 120° C. under a reduced pressure of 1 mmHg for 2 hours and allowed to cool in a nitrogen gas atmosphere.

[Production of red luminescent nanocrystals]
A 1000 ml flask was charged with 17.48 g of indium acetate, 25.0 g of trioctylphosphine oxide, and 35.98 g of lauric acid, and the mixture was stirred at 160° C. for 40 minutes while bubbling with nitrogen gas. After stirring at 250° C. for 20 minutes, the temperature was raised to 300° C. and stirring was continued. In a glove box, 4.0 g of tris(trimethylsilyl)phosphine was dissolved in 15.0 g of trioctylphosphine and then filled in a glass syringe. This was poured into a flask kept at 300°C and reacted at 250°C for 10 minutes. Further, in a glove box, tris(trimethylsilyl)phosphine (7.5 g) dissolved in trioctylphosphine (30.0 g) was added dropwise to the above reaction solution (5 ml) in 12 minutes, and then 5 ml at a time interval of 15 minutes until the reaction solution was used up. Added to.

In a separate three-necked flask, 5.595 g of indium acetate, 10.0 g of trioctylphosphine oxide and 11.515 g of lauric acid were charged, and the mixture was stirred at 160° C. for 40 minutes while bubbling with nitrogen gas. After further stirring at 250° C. for 20 minutes and heating to 300° C., the mixed solution cooled to 70° C. was added to the above reaction solution. 5 ml of a mixed solution prepared by dissolving 4.0 g of tris(trimethylsilyl)phosphine in 15.0 g of trioctylphosphine in the glove box was again added dropwise to the above reaction solution in 12 minutes, and then 5 ml each was reacted at 15-minute intervals until used up. Added to the solution. After stirring for 1 hour and cooling to room temperature, 100 ml of toluene and 400 ml of ethanol were added to agglomerate the fine particles. After the fine particles were precipitated using a centrifuge, the supernatant was discarded and the precipitated fine particles were dissolved in trioctylphosphine to obtain a trioctylphosphine solution of indium phosphide (InP) red light-emitting nanocrystals. ..

[Production of green luminescent nanocrystals]
A 1000 ml flask was charged with 23.3 g of indium acetate, 40.0 g of trioctylphosphine oxide and 48.0 g of lauric acid, and stirred at 160° C. for 40 minutes while bubbling with nitrogen gas. After stirring at 250° C. for 20 minutes, the temperature was raised to 300° C. and stirring was continued. In a glove box, 10.0 g of tris(trimethylsilyl)phosphine was dissolved in 30.0 g of trioctylphosphine and then filled in a glass syringe. This was poured into a flask kept at 300°C and reacted at 250°C for 5 minutes. The flask was cooled to room temperature, and 100 ml of toluene and 400 ml of ethanol were added to aggregate the fine particles. After the fine particles were precipitated using a centrifuge, the supernatant was discarded, and the precipitated fine particles were dissolved in trioctylphosphine to obtain a trioctylphosphine solution of indium phosphide (InP) green luminescent nanocrystals. ..

[Production of InP/ZnS core-shell nanocrystals]
After adjusting the InP nanocrystals synthesized above to 3.6 g of InP and 90 g of trioctylphosphine in the trioctylphosphine solution, the mixture is put into a 1000 ml flask, and further 90 g of trioctylphosphine oxide and 30 g of lauric acid are added. On the other hand, a stock solution is prepared by mixing 162 g of trioctylphosphine with 42.9 ml of a 1M hexane solution of diethylzinc and 92.49 g of a 9.09% by weight trioctylphosphine solution of bistrimethylsilylsulfide in a glove box. After the inside of the flask was replaced with a nitrogen atmosphere, the temperature of the flask was set to 180° C., and when the temperature reached 80° C., 15 ml of the above stock solution was added, and then 15 ml was continuously added every 10 minutes. (Flask temperature maintained at 180°C). After the last addition was completed, the reaction was terminated by maintaining the temperature for another 10 minutes. After the reaction was completed, the solution was cooled to room temperature and 500 ml of toluene and 2000 ml of ethanol were added to aggregate the nanocrystals. After precipitating the nanocrystals using a centrifuge, discarding the supernatant, and re-dissolving the precipitate in chloroform so that the concentration of the nanocrystals in the solution is 20% by mass, InP/ZnS core-shell nanocrystals A chloroform solution of

[QD ligand exchange]
Triethylene glycol monomethyl ether ester of 3-mercaptopropanoic acid (triethylene glycol monomethyl ether mercaptopropionate) (TEGMEMP) was synthesized with reference to JP-A-2002-121549.
In a container filled with nitrogen gas, QD dispersion liquid 1 (the above InP/ZnS core-shell nanocrystals (red light emitting)) and 80 g of a chloroform solution in which 8 g of TEGMEMP synthesized above are dissolved are mixed, and the mixture is mixed at 80° C. for 2 hours. The ligand was exchanged by stirring and cooled to room temperature.
Then, toluene/chloroform was evaporated with stirring at 40° C. under reduced pressure, and the mixture was concentrated until the liquid amount became 100 ml. Four times the weight of n-hexane was added to this dispersion to aggregate QDs, and the supernatant was removed by centrifugation and decantation. 50 g of toluene was added to the precipitate and ultrasonically redispersed. This washing operation was performed three times in total to remove the free ligand component remaining in the solution. The precipitate after decantation was vacuum dried at room temperature for 2 hours to obtain 2 g of a powder of QD (QD-TEGMEMP) modified with TEGMEMP.

[Preparation of titanium oxide dispersion]
In a container filled with nitrogen gas, 6 g of titanium oxide, 1.01 g of a polymer dispersant, and 1,4-butanediol diacetate were mixed so that the nonvolatile content was 40%. After adding zirconia beads (diameter: 1.25 mm) to the mixture in the container filled with nitrogen gas, the closed container filled with nitrogen gas was shaken for 2 hours using a paint conditioner to disperse the mixture. I went. Thereby, a light scattering particle dispersion 1 was obtained.
All of the above materials were prepared by introducing nitrogen gas and replacing the dissolved oxygen with nitrogen gas.

[Example 1]
[Preparation of ink composition]
After uniformly mixing the following (1), (2) and (3) in a container filled with nitrogen gas, the mixture is filtered with a filter having a pore size of 5 μm in a glove box, and nitrogen gas is further introduced into the ink. It was introduced and the nitrogen gas was saturated.
Then, the pressure was reduced to remove the nitrogen gas to obtain an ink composition. The materials used are as follows.

[Light scattering particles]
・Titanium oxide: MPT141 (manufactured by Ishihara Sangyo Co., Ltd.)
[Thermosetting resin]
-Glycidyl group-containing solid acrylic resin: "Findick A-254"
(DIC Corporation, epoxy equivalent 500)
[Polymer dispersant]
-Polymer dispersant: BYK-2164
(Product name by BYK, "DISPERBYK" is a registered trademark)
[Organic solvent]
・1,4-Butanediol diacetate (manufactured by Daicel Corporation)

(1) 22.5 g of a QD dispersion liquid in which the organic solvent 1,4-butanediol diacetate was mixed with the QD-TEGMEMP prepared above to make the nonvolatile content 30%
(2) Thermosetting resin: "Findick A-254" (6.28 g) manufactured by DIC Corporation, and a curing agent: 1-methylcyclohexane-4,5-dicarboxylic acid anhydride (1.05 g) and cured Accelerator: Dimethylbenzylamine (0.08 g) was dissolved in organic solvent: 1,4-butanediol diacetate so that the nonvolatile content was 30%. 12.5 g of thermosetting resin solution
(3) 7.5 g of the light scattering particle dispersion 1

[Example 2]
[Preparation of ink composition]
An ink composition was obtained in the same manner as in Example 1 except that QD dispersion liquid 2 (InP/ZnS core-shell nanocrystals described above (green light emitting property)) was used instead of QD dispersion liquid 1.

[Comparative Example 1]
An ink composition prepared by using decylbenzene as an organic solvent in the same manner as in Example 1 and sealed in nitrogen gas was stirred in the atmosphere to obtain an ink composition. An increase in dissolved oxygen concentration was observed.

[Production of light conversion filter]
The ink composition obtained above was applied onto a glass substrate in the atmosphere with a spin coater so that the film thickness after drying would be 3.5 μm. The coating film was heated to 180° C. in nitrogen to be cured to form a layer (light conversion layer) made of a cured product of the ink composition on the glass substrate. A light conversion filter was obtained by the above operation.

(3) Evaluation The ink composition obtained above and the light conversion filter obtained above were evaluated in the following procedure. The results are shown in Table 1.

[External quantum efficiency (EQE)]
Using the blue LED (peak emission wavelength: 450 nm), an integrating sphere is connected to the emission spectrophotometer (trade name "MCPD-9800") manufactured by Otsuka Electronics Co., Ltd., and an integrating sphere is provided above the blue LED. Was installed. A substrate having a light conversion layer was inserted between the blue LED and the integrating sphere, the blue LED was turned on, and the observed spectrum and illuminance at each wavelength were measured.
The external quantum efficiency was determined as follows from the spectrum measured by the above measuring device and the illuminance. This value is a value indicating how much of the light (photons) incident on the light conversion layer is emitted to the observer as fluorescence. Therefore, if this value is large, it indicates that the light conversion layer is excellent, and it is an important evaluation index together with S(PL).
External quantum efficiency of red emission light conversion layer=P(Red)/E(Blue)×100 (%)
External quantum efficiency of green emission light conversion layer=P(Green)/E(Blue)×100 (%)

Here, E (Blue), P (Red), and P (Green) represent the following, respectively.
E (Blue):
The total value of "illuminance×wavelength/hc" at a wavelength of 380 to 490 nm in this wavelength range is shown. Incidentally, h represents Planck's constant, and c represents the speed of light. (This is the value corresponding to the number of observed photons.)
P (Red):
The total value of "illuminance×wavelength/hc" in the measurement wavelength of 490 to 590 nm in this wavelength range is shown. (Corresponding to the number of photons observed)
P (Green):
The total value of “illuminance×wavelength/hc” at the measurement wavelength of 590 to 780 nm in this wavelength range is shown. (Corresponding to the number of photons observed)

Based on the above, the EQE was calculated, the EQE of Example 2 was set to 10, and the EQE of the measured sample was evaluated as a relative value as follows.
<Evaluation criteria>
Less than 10: D
10: C
Over 10 and under 100: B
More than 100: A

[Bubbling evaluation]
The ink was fed using a liquid feed pump, and the generation of bubbles in the piping tube was visually observed.
[Water content evaluation]
The moisture content was measured by a Karl Fischer moisture meter (Mitsubishi Chemical Corporation model number CA-06, vaporization unit VA-06 manufactured by the same company).

[Example 3]
First, a substrate (BM substrate) having a light shielding portion called a black matrix (BM) was manufactured by the following procedure. That is, after applying a black resist (“CFPR BK” manufactured by Tokyo Ohka Kogyo Co., Ltd.) on a glass substrate made of non-alkali glass (“OA-10G” manufactured by Nippon Electric Glass Co., Ltd.), prebaking, pattern exposure, development and By performing post-baking, a patterned light-shielding portion was formed. The exposure was performed by irradiating the black resist with ultraviolet rays at an exposure dose of 250 mJ/cm ² . The pattern of the light-shielding portion was a pattern having openings corresponding to subpixels of 200 μm×600 μm, the line width was 20 μm, and the thickness was 2.6 μm.

Next, the red light emitting ink composition obtained in Example 1 was printed on the opening portion on the BM substrate by an inkjet method, irradiated with ultraviolet rays, and then heated at 150° C. for 30 minutes in a nitrogen atmosphere. As a result, the ink composition was cured to form a pixel portion made of a cured product of the ink composition. The obtained pixel portion is a pixel portion that converts blue light into red light. The pixel portion had a thickness of 2.1 μm. By the above operation, a patterned light conversion filter was obtained.

[Example 4]
A BM substrate was prepared in the same manner as in Example 3. Next, the red luminescent ink composition obtained in Example 1 and the green luminescent ink composition obtained in Example 2 were printed on the opening portion on the BM substrate by an inkjet method, and then irradiated with ultraviolet rays to obtain Example 3 The ink composition was cured in the same manner as in. As a result, a pixel portion that converts blue light into red light and a pixel portion that converts blue light into green light were formed on the BM substrate. By the above operation, a patterned light conversion filter including a plurality of types of pixel portions was obtained.

10... Pixel part, 10a... 1st pixel part, 10b... 2nd pixel part, 10c... 3rd pixel part, 11a... 1st luminescent nanocrystal particle, 11b... 2nd luminescent nanocrystal particle , 12a... First light-scattering particles, 12b... Second light-scattering particles, 20... Light-shielding portion, 30... Light conversion layer, 40... Base material, 100... Color filter.

Claims (17)

Contains luminescent nanocrystalline particles, thermosetting resin and organic solvent,
An ink composition, wherein the LogP value of the organic solvent is -1.0 or more and 6.5 or less. Contains luminescent nanocrystalline particles, thermosetting resin and organic solvent,
The LogP value of the organic solvent is -1.0 or more and 6.5 or less,
An ink composition having a moisture (H ₂ O) content of 90 ppm or less based on a Karl Fischer moisture meter. Contains luminescent nanocrystalline particles, thermosetting resin and organic solvent,
The LogP value of the organic solvent is -1.0 or more and 6.5 or less,
An inkjet ink composition having a water content (H ₂ O) content of 90 ppm or less based on a Karl Fischer water content meter. The method for producing the ink composition according to claim 3, wherein the ink composition is depressurized to remove dissolved gas. The inkjet ink composition according to claim 3, wherein the water (H ₂ O) content is 20 ppm or less. The inkjet ink composition according to claim 3, wherein the thermosetting resin is insoluble in alkali. 7. The inkjet ink composition according to claim 3, which is capable of forming an alkali-insoluble coating film. The ink composition for inkjet according to claim 3, wherein the surface tension is 20 to 40 mN/m. The inkjet ink composition according to any one of claims 3, 5, 6, 7 or 8, having a viscosity of 2 to 20 mPa·s. The inkjet ink composition according to any one of claims 3, 5, 6, 7, 8 or 9, further containing a solvent having a boiling point of 180°C or higher. The inkjet ink composition according to any one of claims 3, 5, 6, 7, 8, 9 or 10, which is for a color filter. A light conversion layer comprising a cured product of the ink composition according to claim 1. A light conversion layer comprising a cured product of the ink composition according to claim 1, wherein the light conversion layer is alkali-insoluble. A light conversion layer having a plurality of pixel portions,
The light conversion layer, wherein each of the plurality of pixel portions has a pixel portion containing a cured product of the inkjet ink composition according to any one of claims 3, 5, 6, 7, 8, 9 or 10. Further comprising a light shielding portion provided between the plurality of pixel portions,
The plurality of pixel units,
The luminescent nanocrystalline particles containing the cured product and containing, as the luminescent nanocrystalline particles, light that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having an emission peak wavelength in the range of 605 to 665 nm. , A first pixel portion,
The luminescent nanocrystalline particles containing the cured product and containing, as the luminescent nanocrystalline particles, light that absorbs light having a wavelength in the range of 420 to 480 nm and emits light having an emission peak wavelength in the range of 500 to 560 nm. , The 2nd pixel part, The light conversion layer as described in any one of Claims 12-14 which has these. 16. The light conversion layer according to claim 12, wherein the plurality of pixel units further include a third pixel unit having a transmittance of 30% or more for light having a wavelength in the range of 420 to 480 nm. .. A color filter comprising the light conversion layer according to claim 12.

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