KR101985804B1

KR101985804B1 - The composition using optical element

Info

Publication number: KR101985804B1
Application number: KR1020150163157A
Authority: KR
Inventors: 유수영; 권태균; 이성민; 이영신
Original assignee: 주식회사 엘지화학
Priority date: 2015-11-20
Filing date: 2015-11-20
Publication date: 2019-06-04
Also published as: KR20170059173A

Abstract

The present application relates to an optical member and a display device including the optical member.
The optical member and the display device including the optical member according to the present application are economical, have high durability, and can effectively secure the desired optical characteristics as compared with the optical member manufactured in a large-area form.

Description

TECHNICAL FIELD The present invention relates to a composition for an optical member,

The present application relates to a composition for an optical member, an optical member, and a lighting device and a display device including the optical member.

Lighting devices are used in a variety of applications. The lighting device may be, for example, a BLU of a display such as a liquid crystal display (LCD), a television, a computer, a mobile phone, a smart phone, a personal digital assistant (PDA), a gaming device, an electronic reading device, (Backlight Unit). In addition, the lighting device can be used for indoor or outdoor lighting, stage lighting, decorative lighting, accent lighting or museum lighting, and the like, and can also be used for horticulture and special wavelength lighting required for biology.

In recent years, researches have been continuously conducted on a wavelength converting particle, for example, a quartz-dot-based illuminating device for emitting white light, in which the color of light emitted varies depending on the particle size. In particular, various studies have been conducted to improve the dispersibility, stability, and other optical efficiency of quantum dots with respect to a lighting apparatus including a quantum dot.

Korean Patent Publication No. 2011-0048397

The present application provides a composition for an optical member that is excellent in dispersibility of the wavelength converting particles and can ensure stability under high temperature and high humidity conditions.

The present application also provides an optical member having a wavelength conversion region formed from the composition for an optical member and uses thereof.

The present application relates to a composition for an optical member.

The term " optical member " in the present application means a member formed to emit light. For example, the optical member may mean a member formed to absorb light of a predetermined wavelength and emit light of the same or different wavelengths. The shape and shape of the optical member are not particularly limited, and may be, for example, a film shape.

The composition of the present application may be, for example, a composition for forming a wavelength conversion region in an optical member.

The composition for an optical member according to the present application can ensure excellent dispersibility to the wavelength converting particles contained in the wavelength conversion region and exhibit excellent properties in terms of stability at high temperature and / or high humidity conditions.

The composition for an optical member of the present application may comprise two compounds which can be phase-separated from each other.

That is, the composition for an optical member of the present application comprises a first compound; A second compound phase-separated from the first compound, having a boiling point of 200 ° C or higher and not containing a polar functional group; And wavelength conversion particles.

The composition for an optical member of the present application comprises a first compound and a second compound that are phase-separated from each other and mainly contains the wavelength converting particles in a region where the first compound or the second compound is located, The dispersibility and durability of the polymer can be effectively ensured.

The term " phase-separated " means that when the first compound and the second compound are formed in the composition for an optical member through a curing process or the like to be described later, the wavelength-converted regions are divided into regions that are phase- It means that two regions which are not mixed with each other, such as a relatively hydrophobic region and a relatively hydrophilic region, are separated from each other.

In one example, the first compound may be a radically polymerizable compound having a solubility parameter of greater than 10 (cal / cm ³ ) ^1/2 . The solubility parameter of the first compound may refer to the solubility parameter of the single polymer formed by the curing of the first compound. The manner of obtaining the solubility parameter is not particularly limited and may be in accordance with a method known in the art. For example, the parameter may be calculated or obtained according to a method known in the art as a so-called Hansen solubility parameter (HSP). Thus, a compound having a solubility parameter of 10 (cal / cm ³ ) ^1/2 or more can be referred to as a hydrophilic compound. When a hydrophilic compound is selected as the first compound, it can be phase-separated with the second compound.

Solubility parameter of the first compound is about 11 In another example (cal / cm ³⁾ ^1/2 or more, 12 (cal / cm ³⁾ ^1/2 or more, 13 (cal / cm ³⁾ ^1/2 or more, and 14 ( cal / cm ³ ) ^1/2 or more or 15 (cal / cm ³ ) ^{1/2 or} more. Solubility parameter of the first compound is from about 40 (cal / cm ³⁾ ^1/2 or less, about 35 (cal / cm ³⁾ ^1/2 or less, or about 30 (cal / cm ³⁾ ^1/2 or less can in another example have.

In a specific example, the first compound is a compound of the following general formulas (1) to (4): Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound containing a (meth) acrylic acid or a salt thereof.

[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

In formulas (1) to (4), Q ₁ is each independently hydrogen or an alkyl group,

U ₁ are each independently an alkylene group, A is each independently an alkyl with the hydroxyl group may be substituted with a group, Z is hydrogen, an alkoxy group, an group an epoxy group or a monovalent hydrocarbon group, X ₁ is a hydroxy group or a cyano group, m And n is an arbitrary number.

The term "alkyl group" in the present application may mean an alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, unless otherwise specified. The alkyl group may be linear, branched or cyclic. In addition, the alkyl group may be optionally substituted with one or more substituents.

The term "alkylene group" in the present application may mean an alkylene group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms unless otherwise specified. The alkylene group may be linear, branched or cyclic. The alkylene group may optionally be substituted with one or more substituents.

The term " epoxy group " in the present application means, unless otherwise specified, a cyclic ether having three ring constituting atoms or a compound containing such a cyclic ether or a monovalent residue derived therefrom have. As the epoxy group, a glycidyl group, an epoxy alkyl group, a glycidoxyalkyl group or an alicyclic epoxy group can be exemplified. The alicyclic epoxy group may be a monovalent residue derived from a compound containing a structure containing an aliphatic hydrocarbon ring structure and having a structure in which two carbon atoms forming the aliphatic hydrocarbon ring also form an epoxy group. As the alicyclic epoxy group, an alicyclic epoxy group having 6 to 12 carbon atoms can be exemplified, and for example, 3,4-epoxycyclohexylethyl group and the like can be exemplified.

The term "alkoxy group" in the present application may mean an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, unless otherwise specified. The alkoxy group may be linear, branched or cyclic. In addition, the alkoxy group may be optionally substituted with one or more substituents.

The term " monovalent hydrocarbon group " in the present application may mean a monovalent residue derived from a compound consisting of carbon and hydrogen or a derivative of such a compound, unless otherwise specified. For example, the monovalent hydrocarbon group may contain from 1 to 25 carbon atoms. As the monovalent hydrocarbon group, an alkyl group, an alkenyl group, an alkynyl group or an aryl group can be exemplified.

Examples of the substituent which may optionally be substituted in the alkyl group, the alkoxy group, the alkylene group, the epoxy group or the monovalent hydrocarbon group in the present application include a hydroxyl group; Halogen such as chlorine or fluorine; An epoxy group such as a glycidyl group, an epoxy alkyl group, a glycidoxyalkyl group or an alicyclic epoxy group; Acryloyl group; A methacryloyl group; Isocyanate group; Thiol group; An aryloxy group; Or a monovalent hydrocarbon group, but the present invention is not limited thereto.

In the above general formulas (1), (2) and (4), m and n are arbitrary numbers and can be, for example, independently within the range of 1 to 20, 1 to 16 or 1 to 12, respectively.

Examples of the nitrogen-containing radical polymerizable compound include an amide group-containing radical polymerizing compound, an amino group-containing radical polymerizing compound, an imide group-containing radical polymerizing compound, or a cyano group-containing radical polymerizing compound Etc. may be used. Examples of the amide group-containing radical polymerizable compound include (meth) acrylamide or N, N-dimethyl (meth) acrylamide, N, (Meth) acrylamide, N, N'-methylenebis (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, Acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam or (meth) acryloylmorpholine. Examples of the amino group-containing radical polymerizable compound include aminoethyl (meth) acrylate, N-dimethylaminoethyl (meth) acrylate or N, N-dimethylaminopropyl (meth) acrylate. Examples of the imide group-containing radical polymerizable compound include N-isopropylmaleimide, N- Hexyl maleimide or itaconimide The like can be illustrated, and a cyano group-containing radical polymerizable, but as the compound, can be a nitrile such as acrylonitrile or methacrylonitrile, exemplified by acrylonitrile, but is not limited thereto.

As the salt of (meth) acrylic acid, for example, a salt with an alkali metal such as lithium, sodium, and potassium or a salt with an alkaline earth metal such as magnesium, calcium, strontium, and barium is exemplified But is not limited thereto.

After curing, the first compound can form a matrix, for example, in a wavelength conversion region.

The second compound contained in the composition for an optical member is a compound that is phase-separated from the first compound, has a boiling point of 200 ° C or higher, and does not contain a polar functional group. The second compound can form, for example, an emulsion region mainly containing the wavelength converting particles in the wavelength conversion region formed after curing.

Generally, in order to improve the performance of the wavelength converting particles such as so-called quantum dots, the performance and stability of the wavelength converting particles themselves, as well as the reactivity with resins or other materials used for the production of films containing the wavelength converting particles .

The present inventors have found that the wavelength converting particles are positioned in any one of the regions that are phase-separated after curing each other, and that the boiling point is 200 ° C or more in consideration of dispersibility and stability as components of the region where the wavelength converting particles are mainly located, By adopting a compound that does not contain a functional group, stability and dispersibility of the wavelength converting particles can be secured at the same time.

The second compound has a boiling point of 200 캜 or higher. The stability and dispersibility of the desired wavelength converting particles can be simultaneously secured within the range of the boiling point, and the product can be more easily produced. The boiling point of the second compound may also be at least 250 캜, or at least 300 캜, but is not limited thereto. The upper limit of the boiling point is not particularly limited, but may be 1,500 占 폚 or lower, 1,000 占 폚 or lower, or 800 占 폚 or lower.

The second compound also does not contain a polar functional group. When the wavelength converting particle is placed in the region of the compound containing no polar functional group in this way, the desired stability and dispersibility can be effectively ensured. That is, since the polar functional group such as epoxy group, oxetane group, (meth) acryloyl group or (meth) acryloyloxy group may adversely affect the dispersibility and stability of the wavelength converting particles, It is possible to exclude the polar functional group and secure the desired stability and dispersibility.

Such a second compound may, for example, have a solubility parameter less than 10 (cal / cm ³ ) ^1/2 . Thus, a compound having a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 can be referred to as a hydrophobic compound. When a hydrophobic compound is selected as the second compound, it can be phase-separated with the first compound. The solubility parameter of the second compound is another example, for example, ³ (cal / cm 3) over ^{1/2, 4 (cal / cm 3} ) 1/2 or more, or about 5 (cal / cm ³⁾ ^1/2 Or more.

The difference in solubility parameters of the first and second compounds can be controlled for the implementation of a suitable phase separation structure. In one example of the difference between the solubility parameter of the first and second compound is 5 (cal / cm ³⁾ over ^{1/2, 6 (cal / cm 3} ) over ^{1/2, 7 (cal / cm 3} ) 1 / ² or greater than about 8 (cal / cm ³ ) ^1/2 . The difference is a value obtained by subtracting a small value from a large value among the solubility parameters. The upper limit of the difference is not particularly limited. The larger the difference in the solubility parameter, the more appropriate phase separation structure can be formed. The upper limit of the difference may be, for example, 30 (cal / cm ³ ) ^1/2 or less, 25 (cal / cm ³ ) ^1/2 or less, or about 20 (cal / cm ³ ) ^1/2 or less.

The second compound may be, for example, a polymer composed of carbon and hydrogen. The above-mentioned polymer composed of carbon and hydrogen means a polymer containing no atoms other than carbon and hydrogen atoms, and is referred to as a so-called hydrocarbon polymer. The polymer composed of carbon and hydrogen does not contain a polar functional group and may be appropriately selected from those having a boiling point of 200 ° C or higher in consideration of the purpose of the present application.

In one example, the second compound is selected from the group consisting of polybutadiene, polyisobutylene, polyethylene, polypropylene, poly (1-decene), polystyrene, 1-octadecene, 1-nonadecene, cis- , 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-tetradecene, 1-tridecene, 1-undecene or 1-dodecene.

When the second compound and the first compound are included in the composition together with the wavelength converting particles, the first compound and the second compound are phase-separated after the curing and the respective regions are formed in the region formed from such a composition, The first compound or the second compound is located in the region containing the wavelength conversion particles, and the desired dispersibility and stability of the wavelength conversion particles can be achieved.

The second compound may be included in the composition in a proportion of, for example, 5% by weight or more based on the total weight of the solid content of the composition. The upper limit of the content ratio of the second compound is not particularly limited, but may be, for example, 50 wt% or less, 40 wt% or less, 30 wt% or less.

The content ratio of the first compound and the second compound is not particularly limited, but may include, for example, 10 parts by weight to 100 parts by weight of the second compound relative to 100 parts by weight of the first compound. 50 to 95 parts by weight of the first compound and 5 to 50 parts by weight of the second compound. Or 50 to 95 parts by weight of the second compound and 5 to 50 parts by weight of the first compound. The term "parts by weight" in this application means the weight ratio between the components unless otherwise specified.

The composition for an optical member of the present application includes wavelength converting particles.

The term " wavelength conversion particle " in the present application means a nanoparticle formed so as to absorb light of any wavelength and emit light of the same or a different wavelength.

The term " nanoparticle " in the present application means particles having a nano-scale dimension, for example, particles having an average particle size of about 100 nm or less, 90 nm or less, 80 nm or less, 70 nm or less, 50 nm or less, 40 nm or less, 30 nm or less, 20 nm or less, or 15 nm or less. The shape of the nanoparticles is not particularly limited, and may be spherical, ellipsoidal, polygonal or amorphous.

The wavelength converting particle may be a particle capable of absorbing light of a predetermined wavelength and emitting light of the same or a different wavelength.

In one example, the wavelength converting particle is a first wavelength converting particle (hereinafter referred to as a green particle) that absorbs light having a wavelength within a range of 420 to 490 nm and emits light having a wavelength within a range of 490 to 580 nm Or second wavelength converting particles (hereinafter, referred to as red particles) which absorb light of any wavelength within the range of 420 to 490 nm and emit light of any wavelength within the range of 580 to 780 nm .

For example, in order to obtain an optical member having a wavelength conversion region capable of emitting white light, the red particles and / or green particles may be contained together in an appropriate ratio.

In another example, the wavelength converting particle may have an appropriate wavelength range of emitted light so that the wavelength conversion region described below absorbs UV and visible light, and can emit light in the infrared region.

Specifically, the wavelength converting particle may absorb light of any wavelength within the range of 360 nm to 780 nm and emit light of any wavelength within the range of 780 nm to 1,300 nm.

The wavelength converting particles can be used without any particular limitation as long as they exhibit such action. Representative examples of such particles include, but are not limited to, nanostructures called so-called Quantum Dots.

The wavelength converting particles may be in the form of particles, for example, nanowires, nanorods, nanotubes, branched nanostructures, nanotetrapods, tripods ) Or bipods, and such a shape may also be included in the wavelength converting particles defined in the present application. The term " nanostructures " in the present application includes at least one region or feature dimension having dimensions less than about 500 nm, less than about 200 nm, less than about 100 nm, less than about 50 nm, less than about 20 nm, The branch may contain similar structures. In general, region or characteristic dimensions may exist along the smallest axis of the structure, but are not limited thereto. The nanostructure may be, for example, substantially crystalline, substantially monocrystalline, polycrystalline or amorphous, or a combination of the foregoing.

Quantum dots that can be used as wavelength converting particles can be prepared in any known manner. For example, suitable methods for forming quantum dots are disclosed in U.S. Patent Nos. 6,225,198, 2002-0066401, 6,207,229, 6,322,901, 6,949,206, 7,572,393 , U.S. Patent No. 7,267,865, U.S. Patent No. 7,374,807, U.S. Patent No. 6,861,155, and the like, and various other known methods can be applied to the present invention.

Quantum dots or other nanoparticles that may be used in the present application may be formed using any suitable material, for example, an inorganic material, using an inorganic conducting or semi-conducting material. Suitable semiconductor materials include II-VI, III-V, IV-VI, I-III-VI, and IV semiconductors. More specifically, it is possible to use Si, Ge, Sn, Se, Te, B, C (including diamond), P, BN, BP, BAs, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, ZnSe, ZnTe, CdS, CdSe, CdSeZn, CdTe, HgS, HgSe, HgTe, BeS, BeSe, BeTe, MgS, InS, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, ZnO, ZnS, MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si 3 N 4, Ge 3 N 4, Al 2 O 3, (Al, Ga, In) ₂ (S, Se, Te) _3, Al ₂ CO, CuInS _2, CuInSe _2, CuInS ₂ _-x _x Se and may be two or more suitable examples are a combination of the semiconductor, and the like.

In one example, the semiconductor nanocrystals or other nanostructures may comprise a dopant such as a p-type dopant or an n-type dopant. The nanoparticles that may be used in the present application may also include II-VI or III-V semiconductors. Examples of II-VI or III-V semiconductor nanocrystals and nanostructures include any combination of elements in the Periodic Table Group II elements such as Zn, Cd, and Hg, and periodic Table VI elements such as S, Se, Te, Po, And Group V elements such as B, Al, Ga, In, and Tl and Group V elements such as N, P, As, Sb and Bi, but are not limited thereto. Suitable inorganic nanostructures in other examples include metal nanostructures and suitable metals include Ru, Pd, Pt, Ni, W, Ta, Co, Mo, Ir, Re, Rh, Hf, Nb, , Sn, Zn, Fe, or FePt, but the present invention is not limited thereto.

The wavelength converting particle, for example, the quantum dot, may have a core-shell structure. Exemplary materials capable of forming the wavelength converting particles of the core-cell structure include Si, Ge, Sn, Se, Te, B, C (including diamond), P, Co, Au, BN, BP, BAs, ZnS, ZnSe, ZnTe, CdSe, CdSeZn, AlS, AlSb, GaN, GaP, GaAs, GaSb, InN, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, GaN, GaP, , CdTe, HgS, HgSe, HgTe , BeS, BeSe, BeTe, MgS, MgSe, GeS, GeSe, GeTe, SnS, SnSe, SnTe, PbO, PbS, PbSe, PbTe, CuF, CuCl, CuBr, CuI, Si 3 N ₄ , Ge ₃ N ₄ , Al ₂ O ₃ , (Al, Ga, In) ₂ (S, Se, Te) ₃ , Al ₂ CO and any combination of two or more of these materials. no.

Exemplary core-cell wavelength conversion particles (cores / cells) applicable in the present application include, but are not limited to, CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS or CdTe / It is not.

Further, the wavelength conversion particles may be polymer particles composed of an organic material. The kind and size of the polymer particles made of the organic material can be used, for example, without limitation, those disclosed in Korean Patent Laid-Open Publication No. 2014-0137676.

The specific kind of the wavelength conversion particle is not particularly limited, and can be appropriately selected in consideration of the desired light emission characteristics.

In one example, the wavelength converting particles may be surrounded by one or more ligands or barriers. The ligand or barrier may be advantageous to improve the stability of the wavelength converting particle and to protect the wavelength converting particle from harmful external conditions including high temperature, high intensity, external gas or moisture. As described later, the wavelength converting particles may exist only in one of the emulsion region and the matrix. In order to obtain such a wavelength converting region, the characteristics of the ligand or barrier should be compatible only with one of the emulsion region and the matrix . &Lt; / RTI >

In a specific example, the wavelength converting particle may comprise a ligand conjugated, cooperated, associated or attached to its surface. A ligand capable of exhibiting properties suitable for the surface of the wavelength converting particle and a method for forming the ligand are known, and such a method can be applied without limitation in the present application. Such materials and methods are disclosed, for example, in U.S. Patent Publication No. 2008-0281010, U.S. Patent Publication No. 2008-0237540, U.S. Patent Publication No. 2010-0110728, U.S. Patent Application No. 2008-0118755, U.S. Patent No. 7,645,397 U.S. Patent No. 7,374,807, U.S. Patent No. 6,949,206, U.S. Patent No. 7,572,393, U.S. Patent No. 7,267,875, and the like, but are not limited thereto. In one example, the ligand may be a molecule having an amine group (oleylamine, triethylamine, hexylamine, naphtylamine, etc.) or a polymer, a molecule having a carboxyl group (oleic acid or the like), a polymer having a thiol group (butanethiol, hexanethiol, dodecanethiol, etc.) A molecule having a phosphine group (e.g., triphenylphosphine), a molecule having an oxidized phosphine group (such as trioctylphosphine oxide), a molecule having a carbonyl group (such as alkyl ketone), a polymer having a benzene ring (Butene, hexanol, etc.) or a polymer having a hydroxyl group (e.g., benzene, styrene, etc.) or a polymer or a hydroxyl group.

The wavelength conversion particles may be contained in the composition in a proportion of, for example, 0.05 to 20 parts by weight, 0.05 to 15 parts by weight, 0.1 to 15 parts by weight, or 0.5 to 15 parts by weight, relative to 100 parts by weight of the solid content of the composition, no.

The composition for an optical member of the present application may further comprise a radical initiator capable of polymerizing the first compound.

The kind of the radical initiator contained in the composition is not particularly limited. As the initiator, a radical thermal initiator or a photo initiator capable of initiating a curing reaction by applying heat or irradiating light may be used.

Examples of the thermal initiator include 2,2-azobis-2,4-dimethylvaleronitrile (V-65, Wako), 2,2-azobisisobutyronitrile (V- Azo type initiators such as 2,2-azobis-2-methylbutyronitrile (V-59, Wako); (Peroyl NPP, NOF), diisopropyl peroxydicarbonate (Peroyl IPP, NOF), bis-4-butylcyclohexyl peroxydicarbonate (Peroyl TCP, NOF (Peroyl EEP, NOF), diethoxyhexyl peroxydicarbonate (peroyl OPP, NOF), hexyl peroxydicarbonate (Perhexyl ND, NOF), diethoxyethyl peroxydicarbonate ), Dimethoxybutylperoxy dicarbonate (Peroyl MBP, NOF), bis (3-methoxy-3-methoxybutyl) peroxy dicarbonate (Peroyl SOP, NOF), hexyl peroxypivalate (Perflux, NOF), trimethylhexanoyl peroxide (Peroyl 355, NOF), amyl peroxypivalate (Luperox 546M75, Atofina), butyl peroxypivalate (Peroxy compound); (Luperox 610M75, Atofina), amyl peroxyneodecanoate (Luperox 546M75, Atofina) or butyl peroxyneodecanoate (Luperox 10M75, available from Atofina Peroxy dicarbonate compounds such as a)); Acyl peroxides such as 3,5,5-trimethylhexanoyl peroxide, lauryl peroxide or dibenzoyl peroxide; Ketone peroxide; Dialkyl peroxides; Peroxyketals; Or a peroxide initiator such as hydroperoxide, etc., can be used. As the photoinitiator, benzoin, hydroxy ketone, amino ketone or phosphine oxide photoinitiators can be used. Specifically, Benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethyl anino acetophenone, 2,2-dimethoxy- 2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1 (4-methylthio) phenyl] -2-morpholino-propan-1-one, 4- - phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methyl anthraquinone, 2-ethyl anthraquinone, 2-t-butyl anthraquinone , 2-aminoanthraquinone, thioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, (2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] propanone] and 2,4,6-trimethylbenzoyl-diphenyl - phosphine oxide, and the like can be used, but the present invention is not limited thereto.

As the initiator, a compound having high solubility in a hydrophilic component can be selected and used. For example, a hydroxyketone compound, an aqueous dispersion-type hydroxyketone compound, an amino ketone compound, or an aqueous dispersion- It is not.

The radical initiator may be included in the composition in the range of, for example, 0.1 to 10 parts by weight based on 100 parts by weight of the composition forming the wavelength conversion region. Such a ratio can be changed, for example, in consideration of the physical properties of the film and the curing efficiency.

The composition for an optical member of the present application may further contain a substance such as a crosslinking agent, a surfactant, scattering particles, an oxygen scavenger, a radical scavenger or an antioxidant in addition to the above-mentioned components.

The present application is also directed to an optical member.

The optical member of the present application includes two regions which are phase-separated from each other.

In one example, one region of the mutually phase-separated regions may be referred to as a first region, and the remaining region may be referred to as a second region. As described above, by including the first region and the second region that can be phase-separated from each other after the polymerization, and including the wavelength conversion particles in any one of the first region and the second region, It is possible to improve the adhesion between the conversion regions and more effectively control the factors that may adversely affect the wavelength conversion particles such as the initiator and the crosslinking agent to provide the optical member with excellent durability.

In the present application, the first region and the second region that are phase-separated from each other and the region including the wavelength conversion particles present in any one of the two regions can be referred to as a wavelength conversion region. The wavelength conversion region may be, for example, a layer structure, but is not limited thereto.

The first region and the second region may be hydrophilic regions and the second region may be a hydrophobic region. In the present application, hydrophilicity and hydrophobicity, which distinguish the first and second regions, are relative concepts, and an absolute criterion of hydrophilicity and hydrophobicity is that the two regions are distinguished from each other in the wavelength conversion region And is not particularly limited.

The field conversion region includes the first region and the second region. The ratio of the first hydrophilic region and the second hydrophobic region in the wavelength conversion region may vary depending on, for example, the ratio of the wavelength conversion particles to be included in the wavelength conversion region, the adhesion with other layers such as the barrier layer, The production efficiency of the structure, the physical properties required for film formation, and the like. For example, the wavelength conversion region may include a second region ranging from 10 parts by weight to 100 parts by weight with respect to 100 parts by weight of the first region. In another example, the wavelength conversion region may comprise 50 to 95 parts by weight of the first region and 5 to 50 parts by weight of the second region. Alternatively, the wavelength conversion region may include 50 to 95 parts by weight of the second region and 5 to 50 parts by weight of the first region. The term "parts by weight" in this application means the weight ratio between the components unless otherwise specified. In the above, the ratio of the weight of the first and second regions may be a ratio of the weight of each region itself; The ratio of the total weight of all components contained in each region; The weight ratio between the components contained in the main component of each region or the weight of the material used to form each of the regions. For example, the wavelength conversion region may be formed by mixing and polymerizing the above-mentioned composition. In this case, the ratio of the weight of each of the above regions is preferably between the first compound and the second compound, Weight ratio.

In one example, the wavelength conversion region may be in the form of an emulsion. In the meantime, the term " emulsion type layer " in this application means that any one of two or more phases (for example, the first and second regions) which are not mixed with each other is a continuous phase continuous phase, and the other region is a dispersed phase dispersed in the continuous phase. The continuous phase and the dispersed phase may be solid phase, semi-solid phase or liquid phase, respectively, and may be the same phase or different phase. The term " emulsion " in the present application does not necessarily mean only the emulsion formed by two or more liquid phases, although the term " emulsion " is a term mainly used for two or more liquid phases which do not intermingle with each other.

In one example, the wavelength conversion region includes a matrix forming the continuous phase, and may include an emulsion region that is a dispersed phase dispersed in the matrix. In this case, the matrix is any one of the above-described first and second regions (for example, the first region), and the emulsion region as the dispersed phase is the region of the other of the first and second regions Region).

That is, the optical member of the present application comprises an emulsion region dispersed in a continuous phase matrix and having a second compound with a boiling point of at least 200 ° C and no polar functional group, wherein the wavelength conversion And has a wavelength conversion region containing particles.

In one example, the emulsion region may be in the form of particles. That is, the emulsion regions may be dispersed within the matrix in the form of particles. In this case, the particle shape of the emulsion region is not particularly limited, and may be roughly spherical, ellipsoidal, polygonal or amorphous. The average diameter of the particle shape may be in the range of about 1 탆 to 200 탆, in the range of about 1 탆 to 50 탆, or in the range of about 50 탆 to 200 탆. The size of the particle shape can be controlled by controlling the ratio of the material forming the matrix and the emulsion region, or by using a surfactant or the like.

The ratio of the matrix and emulsion region in the wavelength conversion region is. For example, the ratio of the wavelength conversion particles to be included in the wavelength conversion region, the adhesion with other layers such as the barrier layer, the production efficiency of the emulsion structure as the phase separation structure, or the physical properties required for film formation may be selected . For example, the wavelength conversion region may comprise from 5 to 40 parts by weight of the emulsion region relative to 100 parts by weight of the matrix. The ratio of the emulsion region may be 10 parts by weight or more or 15 parts by weight or more based on 100 parts by weight of the matrix. The ratio of the emulsion region may be 35 parts by weight or less based on 100 parts by weight of the matrix. The ratio of the weight of the matrix and the emulsion region in the above is the ratio of the weight of each region itself or the sum of the weights of all the components contained in the region or the ratio of the main component or the weight of the material used for forming each of the regions It can mean the ratio. For example, the matrix and emulsion region may comprise the first compound or second compound described above, wherein the weight ratio of each region may refer to the weight ratio of each compound to the total.

The wavelength converting particles may be contained in the matrix or the emulsion region. In one example, the wavelength converting particle may be contained in only one of the matrix and the emulsion region, and may not be substantially contained in the other region. The fact that the wavelength conversion particles are not substantially contained in any region in the present application means that the ratio of the weight ratio of the wavelength conversion particles contained in the region to the total weight of the wavelength conversion particles contained in the wavelength conversion region , 10% or less, 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1% or less, 0.5% or less or 0.1% It can mean.

In one example, the wavelength converting particles may be substantially contained in the emulsion region in the matrix and the emulsion region. In this case, the matrix may contain substantially no wavelength converting particles. Therefore, in the above case, the ratio of the wavelength conversion particles contained in the emulsion region is preferably 90% by weight or more, 91% by weight or more, 92% by weight or more, At least 93% by weight, at least 94% by weight, at least 95% by weight, at least 96% by weight, at least 97% by weight, at least 98% by weight, at least 99% by weight, at least 99.5% by weight or at least 99.9% by weight. The wavelength converting particles may be, for example, the above-mentioned green particles and / or red particles, or particles that absorb light of any wavelength within the range of 360 nm to 780 nm and emit light of any wavelength within the range of 780 nm to 1,300 nm .

By forming two regions phase-separated in the wavelength conversion region and locating the wavelength conversion particles substantially in only one of the two regions, it is possible to secure physical properties suitable for film formation, for example, And other factors that may adversely affect the physical properties of the nanoparticle such as an initiator and a crosslinking agent in the region where the wavelength converting particles exist at the time of forming the light emitting film It is possible to form a film having excellent durability by controlling it more effectively.

Any one of the matrix and the emulsion region may contain a hydrophilic polymer and the other region may include a hydrophobic polymer.

In one example, the hydrophilic polymer may be formed from the first compound described above, and the hydrophobic polymer may be the second compound.

In the hydrophilic polymer is the HSP (Hansen solubility parameter) is 10 (cal / cm ³⁾ ^1/2 or more means the polymer, and the hydrophobic polymer is less than the HSP 10 (cal / cm ³⁾ ^1/2 the polymer, as described above It can mean.

In a specific example, the matrix may comprise a hydrophilic polymer and the emulsion region may comprise a hydrophobic polymer.

The matrix may be formed by polymerizing the first compound, for example, a radically polymerizable compound having a solubility parameter of 10 (cal / cm ³ ) ^1/2 or more. In this case, the matrix is a compound of the following formulas 1 to 4; Nitrogen-containing radically polymerizable compounds; And a radical polymerizable compound including a (meth) acrylic acid or its salt site.

[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

In formulas (1) to (4), Q ₁ is each independently hydrogen or an alkyl group,

As the kinds of the radical polymerizing compound including the nitrogen-containing radical polymerizing compound and the (meth) acrylic acid or salt thereof, all of the above-mentioned ones mentioned in the composition for an optical member can be applied.

The emulsion region may comprise, for example, a second compound. The second compound has a boiling point of at least 200 캜 and does not contain a polar functional group.

As described above, when a compound having a boiling point of 200 ° C or higher and containing no polar functional group is used as the second compound, the dispersibility and stability of the wavelength converting particles can be secured at the same time, Is used as a light-emitting film which can be guided to a liquid crystal panel, desired optical characteristics can be effectively expressed.

In one example, the second compound may have a solubility parameter less than 10 (cal / cm < ³ >) ^1/2 as described above, and may be a polymer composed of carbon and hydrogen.

Specifically, the second compound is selected from the group consisting of polybutadiene, polyisobutylene, polyethylene, polypropylene, poly (1-decene), polystyrene, 1-octadecene, 1-nonadecene, cis- 1-heptadecene, 1-hexadecene, 1-pentadecene, 1-tetradecene, 1-tridecene, 1-undecene or 1-dodecene.

The wavelength conversion region may be a layer structure including, for example, the above-described continuity and dispersibility.

At this time, the thickness of the layer structure is not particularly limited, and may be selected within an appropriate range in consideration of the intended use and optical characteristics. In one example, the wavelength conversion region may be a layer structure having a thickness in the range of 10 to 500 mu m, 10 to 400 mu m, 10 to 300 mu m, or 10 to 200 mu m, but is not limited thereto.

The optical member may further include a barrier film on one surface or both surfaces thereof to control the reaction of the wavelength converting particles contained in the wavelength converting region with oxygen, water vapor, or the like. Such barrier ribs can protect the wavelength conversion region from conditions under high temperature conditions or in the presence of harmful external factors such as oxygen and moisture.

Fig. 1 shows a structure including one example of the optical member 100 including the wavelength conversion region 101 and the barrier films 102a and 102b disposed on both sides thereof. The barrier film may be formed of a material having good stability, for example, which is hydrophobic and does not cause yellowing even when exposed to light. In one example, the barrier film may be selected to have a refractive index that is generally similar to the wavelength conversion region.

The barrier film can be, for example, a solid material, or a cured liquid, gel, or polymer, and can be selected from materials that are flexible or non-flexible depending on the application. The kind of the material forming the barrier film is not particularly limited and may be selected from known materials including glass, polymer, oxide, nitride, or the like. Barrier films include, for example, glass; Polymers such as PET (poly (ethylene terephthalate)); Or an oxide or nitride such as silicon, titanium or aluminum, or a combination of two or more of the above, but is not limited thereto.

The barrier film may be present on both surfaces of the wavelength conversion region as shown exemplarily in Fig. 1, or may exist only on either surface. In addition, the optical member may have a structure in which a barrier film exists on both surfaces as well as on both sides, and the wavelength conversion region is entirely sealed by the barrier film.

The method for producing such an optical member is not particularly limited, but may be formed by polymerizing, for example, a composition for an optical member containing a first compound, a second compound, wavelength conversion particles and other additives described above.

In one example, the optical member comprising the wavelength conversion region can be formed by coating the composition on a suitable substrate in a known coating manner.

The method of curing the region formed in the above manner is not particularly limited. For example, it is possible to apply an appropriate range of heat to activate the initiator contained in each composition, or to apply electromagnetic waves such as ultraviolet rays Or the like.

In the above manufacturing method, the above-described wavelength conversion region is formed through the above steps. If necessary, a step of forming a barrier film after forming the wavelength conversion region through the above step may be further performed, or the polymerization process may be performed adjacent to the barrier film.

The optical member including the wavelength conversion region thus formed can be used for an illumination device designed to absorb light of any wavelength within a range of 420 nm to 490 nm and emit white light, for example.

The optical member may include a wavelength conversion region that absorbs light of any wavelength within the range of 360 nm to 780 nm and emits light of any wavelength within the range of 780 nm to 1,300 nm, and may be used for solar power generation or the like.

In one example, the optical member of the present application can be used in a lighting apparatus. An exemplary illumination device may include a light source and the optical member. In one example, the light source and the optical member in the illumination device can be arranged so that the light irradiated from the light source can enter into the optical member. When the light emitted from the light source is incident on the optical member, a part of the incident light is not absorbed by the wavelength converting particles in the optical member but is emitted as it is, while the other part is absorbed by the wavelength converting particle Can be released. Accordingly, the color purity or color of light emitted from the optical member can be adjusted by adjusting the wavelength of the light emitted from the light source and the wavelength of the light emitted from the wavelength converting particles. For example, if the wavelength conversion region includes the above-mentioned red and green particles in an appropriate amount, and the light source is adjusted to emit blue light, white light may be emitted from the light source member.

The type of the light source included in the illumination device of the present application is not particularly limited, and an appropriate type can be selected in consideration of the type of the target light. In one example, the light source is a blue light source, and may be, for example, a light source capable of emitting light in a wavelength range of 420 to 490 nm.

Figs. 2 and 3 are views showing, by way of example, a lighting apparatus including a light source and an optical member as described above.

As shown in Figs. 2 and 3, the light source and the optical member in the illuminating device can be arranged such that the light irradiated from the light source can be incident on the optical member. In FIG. 2, the light source 201 is disposed below the optical member 100, so that the light emitted from the light source 201 in the upward direction can be incident on the optical member 100.

Fig. 3 shows a case where the light source 201 is disposed on the side surface of the optical member 100. Fig. When the light source 201 is disposed on the side surface of the optical member 100 as described above, light from the light source 201, such as a light guiding plate 301 or a reflection plate 302, Other means for enabling the light to be efficiently incident on the optical member 100 may be included.

The example shown in Figures 2 and 3 is one example of a lighting device of the present application, and the lighting device may have various known configurations and may additionally include various known configurations for this purpose.

The illumination device of the present application can be used for various applications. A typical application to which the illumination apparatus of the present application may be applied is a display apparatus. For example, the illumination device can be used as a BLU (Backlight Unit) of a display device such as an LCD (Liquid Crystal Display).

In addition, the lighting device may be a backlight unit (BLU) of a display device such as a computer, a mobile phone, a smart phone, a personal digital assistant (PDA), a gaming device, an electronic reading device or a digital camera, , Stage lighting, decorative lighting, accent lighting or museum lighting, etc. In addition, it may be used in horticulture, special wavelength lighting required in biology, etc., but the application to which the lighting device can be applied is not limited to the above.

The present application can provide a composition for an optical member that is excellent in dispersibility of the wavelength converting particles and can secure stability under high temperature and high humidity conditions.

The present application can also provide an optical member having a wavelength conversion region formed from such a composition for an optical member and its use.

1 is a sectional view of an exemplary optical member.
Figures 2 and 3 are schematic diagrams of an exemplary lighting device.
4 is a photomicrograph of the wavelength conversion region according to Example 1 of the present application.
FIGS. 5 and 6 are the results of observing a region in which the quantity of emitted light decreases after the light is incident on the optical member according to the examples and comparative examples of the present application for 24 hours.
FIG. 7 is a graph showing a time-dependent change in the amount of light emission of the optical member according to Examples and Comparative Examples of the present application.

Hereinafter, the light-emitting film or the like of the present application will be specifically described by way of examples and comparative examples, but the range of the light-emitting film or the like is not limited to the following examples.

Example One.

PEGDA (poly (ethyleneglycol) diacrylate, CAS No .: 26570-48-9, solubility parameter (HSP): about ^{18 (cal / cm 3) 1/2} ), Poly (1-decene) (Sigma Aldrich (Cat.No 0.462349, viscosity 50cSt (40 ℃)), the green particles (Quantum Dot particles), a surface active agent (polyvinylpyrrolidone), and SiO ₂ nanoparticles 9 (lit.): 1: 0.1: 0.05: 0.05 (PEGDA: Poly (1- decane: green particles: surfactant: SiO ₂ nanoparticles). Irgacure 2959 and Irgacure 907 as radical initiators were mixed at a concentration of about 1% by weight and stirred for about 6 hours to prepare a mixture . The mixture was placed between two barrier films (i-components) spaced apart at regular intervals to a thickness of about 100 mu m and irradiated with ultraviolet light to induce radical polymerization and cure to form a light emitting layer. In the figure, the emulsion region in which the green particles are present corresponds to the wavelength conversion region It can be confirmed that the dispersion is present in the Ricks.

Comparative Example 1

LA (lauryl acrylate, CAS No .: 2156-97-0, solubility parameter (HSP): about ^{8 (cal / cm 3) 1/2} ), bis fluorene diacrylate (BD, bisfluorene diacrylate, CAS No .: 161182-73-6, solubility parameter (HSP): about 8 to ^{9 (cal / cm 3) 1/2} ), TMPTA (trimethylolpropane triacylate, CAS No .: 15625-89-5), green particles (Quantum Dot particles and SiO ₂ nanoparticles were mixed in a weight ratio of 10: 1: 0.1: 0.05: 0.05 (LA: BD: TMPTA: green particles: SiO ₂ nanoparticles) A wavelength conversion region was fabricated to produce an optical member.

Test Example 1

The optical member manufactured in Example 1 or Comparative Example 1 was placed at a room temperature on the light emitting side of the light source emitting light in the blue region and light emitted from the light source was incident for about 24 hours. Thereafter, a region (damaged region) where the amount of light emitted from the edge of the member was reduced through the microscope was confirmed. Fig. 5 is a result of observation for Example 1, and the damage region (light-reduced area) was about 200 mu m or so. Fig. 6 shows the result of observation for Comparative Example 1, and the damage region (area where the light amount is reduced) was about 1000 mu m or so. FIG. 7 is a graph showing the degree of occurrence of the damaged region (light-reduced area) in Example 1 and Comparative Example 1 with time. FIG.

100: optical member
101: Wavelength conversion area
102a, 102b: barrier layer
201: Light source
301: light guide plate
302: reflector

Claims

A solubility parameter of 10 (cal / cm ³⁾ ^1/2 or more radical-polymerizable compound, the first compound;
A second compound phase-separated from the first compound and having a solubility parameter of less than 10 (cal / cm ³ ) ^1/2 , a boiling point of at least 200 ° C, and no polar functional group; And
Wavelength conversion particles,
The second compound may be selected from the group consisting of poly (1-decene), 1-octadecene, 1-nonadecene, cis-2-methyl-octadecene, 1-heptadecene, 1-tridecene, 1-undecene or 1-dodecene.

delete

The method according to claim 1,
The first compound is a compound of the following formulas (1) to (4); Nitrogen-containing radically polymerizable compounds; (Meth) acrylic acid or a salt thereof. The composition for an optical member according to claim 1,
[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

In formulas (1) to (4), Q ₁ is each independently hydrogen or an alkyl group,
U ₁ is each independently an alkylene group,
A is independently an alkylene group in which the hydroxy group may be substituted,
Z is hydrogen, an alkoxy group, an epoxy group or a monovalent hydrocarbon group,
X ₁ is a hydroxy group or a cyano group,
m and n are arbitrary numbers.

delete

The method according to claim 1,
And the second compound is a polymer composed of carbon and hydrogen.

The method according to claim 1,
And the second compound is contained in an amount of 5% by weight or more based on the total weight of the solid content of the composition.

delete

The method according to claim 1,
Wherein the wavelength converting particle is a quantum dot or a polymer particle.

The method according to claim 1,
The wavelength converting particle absorbs light of any one wavelength within a range of 420 nm to 490 nm and absorbs light of one wavelength within a range of 420 nm to 490 nm or first wavelength converting particle which emits light of any wavelength within a range of 490 nm to 580 nm And a second wavelength converting particle that emits light having a wavelength within a range of 580 nm to 780 nm.

The method according to claim 1,
Wherein the wavelength converting particle absorbs light of any wavelength within the range of 360 nm to 780 nm and emits light of any wavelength within the range of 780 nm to 1,300 nm.

The method according to claim 1,
Wherein the composition further comprises a surfactant, scattering particles or an antioxidant.

An emulsion region dispersed in a continuous phase matrix and having a solubility parameter of less than 10 (cal / cm < ³ >) ^1/2 , a second compound having a boiling point of at least 200 DEG C and no polar functional group, Or a wavelength conversion region containing the wavelength converting particles existing in the emulsion region,
Wherein the matrix comprises polymerized units of a first compound that is a radically polymerizable compound having a solubility parameter of 10 (cal / cm < ³ >) ^1/2 or greater,
The second compound may be selected from the group consisting of poly (1-decene), 1-octadecene, 1-nonadecene, cis-2-methyl-octadecene, 1-heptadecene, 1-tridecene, 1-undecene or 1-dodecene.

delete

13. The method of claim 12,
And the second compound is a polymer composed of carbon and hydrogen.

delete

13. The method of claim 12,
Wherein the ratio of the wavelength conversion particles contained in the emulsion region is 90% by weight or more of the total wavelength conversion particles contained in the wavelength conversion region.

13. The method of claim 12,
Wherein the emulsion region is in the form of particles.

18. The method of claim 17,
Wherein the average diameter of the particle shape is in the range of 1 占 퐉 to 200 占 퐉.

13. The method of claim 12,
The first compound is a compound of the following formulas (1) to (4); Nitrogen-containing radically polymerizable compounds; And a radically polymerizable compound containing a (meth) acrylic acid or a salt thereof.
[Chemical Formula 1]

(2)

(3)

[Chemical Formula 4]

13. The method of claim 12,
Wherein the wavelength conversion region absorbs light within a range of 360 nm to 780 nm and emits light within a range of 780 nm to 1,300 nm.

Light source; And
The illumination device according to claim 12, wherein the optical member is arranged so that light from the light source can enter.

A display device comprising the lighting device of claim 21.