KR20060081649A - The full color oled display construction and manufacturing method by using photoluminescent layer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full color organic light emitting diode display structure using a light excitation diffusing material and a method of manufacturing the same. The present invention relates to a blue organic light emitting diode and a light excitation diffusing material added with blue or a small amount of green and red, The use of color filters has been developed to improve light efficiency, color efficiency, resolution and to increase the color reshaping of displays as well as being applicable to large area displays, production cost reductions and flexible substrates;

An organic light emitting die rod, which is a light source, and an optical excitation material and a color filter, which receive light from the light source and convert the light into excitation and color; A thin film of an organic light emitting diode display is formed on the upper surface of the substrate by depositing a transparent conductive film sputtering method such as indium-tin-oxide (ITO) on the upper surface of the photoexcitation material and the color filter and thermally depositing an organic light emitting material and a metal electrode on the upper surface thereof. The present invention relates to a full color organic light emitting diode display structure and a method of manufacturing the same.

AMOLED, PMOLED, Full Color OLED Display, Color Conversion, Color Filter, Blue OLED, photoluminescence

Description

Full Color OLED Display construction and manufacturing method by Using Photoluminescent Layer

1 is a conceptual diagram showing a color filter layer according to an embodiment of the present invention

2A is a conceptual diagram illustrating a general structure of a bottom type organic light emitting diode.

2b is a conceptual diagram showing a general structure of a top type organic light emitting diode

Figure 3a is a conceptual diagram showing an embodiment produced in the bottom method

Figure 3b is a conceptual diagram showing an embodiment produced by the Top method

4 is a conceptual diagram illustrating an embodiment in which a light emitting diode is manufactured as a microcavity organic light emitting diode.

5 is a block diagram showing a manufacturing method according to an embodiment of the present invention.

6 is a block diagram showing a manufacturing method according to another embodiment of the present invention.

7 is a spectrum of a conventional blue organic light emitting diode and a microcavity organic light emitting diode.

8 is a spectrum after passing through a blue organic light emitting diode and a light excitation diffusing material

FIG. 9 is a spectrum in which the blue organic light emitting diode and the photoexcited material of FIG. 8 pass through a color filter to emit blue, green, and red colors, respectively.

10 is a graph showing the spectrum of FIG. 9 in color coordinates;

11 is a spectrum of a conventional blue organic light emitting diode and a blue organic light emitting diode in which red is added.

12 is a graph showing the efficiency of FIG.

Figure 13 is a cross-sectional view of a full color organic light emitting diode display using a conventional fixed fine shadow mask method.

14 is a cross-sectional view of a full color organic light emitting diode display using a conventional white organic light emitting diode and color filter.

15 is a cross-sectional view of a full color organic light emitting diode display using a conventional blue organic light emitting diode and a color converting material.

<Explanation of symbols for main parts of the drawings>

1: substrate

2: light emitting diode

     21: transparent substrate

     22: positive electrode

          221: semi-transmissive metal layer 222: transparent space layer

     23: organic light emitting layer

          231: hole injection layer 232: hole transport layer

          233 light emitting layer 234 hole limiting layer

235: electron transport layer 236: electron injection layer

24: negative electrode

241: reflector 242: transparent space layer

243: transflective metal layer

3: color filter

     31: red color filter 32: green color filter

     33: blue color filter

          310: black metrics 320: photoexcitation diffuser

     41: forming the black matrix pattern

     42: color filter forming step

     43: step of forming photoexcitation diffuser

     44: heating step

     45: developing stage

     46: forming an anode electrode

     47: organic light emitting layer forming step

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full color organic light emitting diode display using a light excitation diffuser and a color filter. The present invention relates to a blue organic light emitting diode, a blue or a small amount of green and red, and a light excitation diffuser and a color filter. The present invention relates to a full color organic light emitting diode display developed to improve light efficiency, color efficiency, resolution, and to enlarge a large area of a display, reduce production costs, and facilitate the manufacture of a flexible substrate.

In general, a display using a full color organic light emitting diode is classified into three types. The first method is to emit red, green, and blue light using a fine-fine fine shadow mask, and the second is to produce red, green, and blue light using a white organic light emitting diode and a color filter. That's the way. The third method is to draw red, green, and blue colors using a color changing medium (CCM) in a blue organic light emitting diode.

FIG. 13 is a cross-sectional view of a full color organic light emitting diode display using a conventional high definition fine shadow mask method. The red, green, and blue light emitting methods as shown in the above example have good luminous efficiency and color, but are limited in the minimum line width of the shadow mask. (About several tens of micrometers) is difficult to manufacture at high resolution.

In addition, as the substrate grows, it is difficult to manufacture a large area due to the bending of the high-fine fine shadow mask.

FIG. 14 is a cross-sectional view of a conventional full color organic light emitting diode display using a white organic light emitting diode and a color filter. In the case of extracting red, green, and blue colors using the white organic light emitting diode and a color filter, a fine fine shadow is shown. High resolution is possible because a photolithography and an open type shadow mask are used without using a mask.

However, in this case, not only the luminous efficiency of the white organic light emitting diode is low, but also the color conversion is severe as the voltage increases.

FIG. 15 is a cross-sectional view of a full color organic light emitting diode display using a conventional blue organic light emitting diode and a color converting material, and a method of extracting red, green, and blue colors using the blue organic light emitting diode and the color converting material is shown in FIG. High resolution is possible because the high-definition shadow shadow mask is not used in the same way as the method using a light emitting diode and a color filter, but the luminous efficiency of the blue organic light emitting diode as a light emitting source is not only low, but also the efficiency of the color conversion material that converts colors. It has the disadvantage of being low and expensive.

The present invention has been developed to solve the above problems, the object of which is to insert a light excitation diffuser on the upper surface of the color filter, the light emitted from the organic light emitting diode is excited and amplified by the light excitation diffuser at the same time color filter Through red, green, and blue through to improve the light efficiency and color purity.

In addition, a high-resolution, large-area organic light emitting diode display is manufactured by fabricating a photoexcitation diffuser and a color filter through photolithography without using a fine-fine shadow mask.

In addition, the color filter and the substrate having a constant pattern of optical excitation diffuser on the color filter, a positive electrode having a high reflectance and work function, a negative electrode having a transparent and low work function, and a thin organic light emitting film therebetween. The purpose is to fabricate an organic light emitting diode display that combines organic light emitting diodes to emit red, green, and blue light.

In addition, the organic light emitting diode uses a micro-cavity structure to move blue to deep blue color, thereby increasing energy, and the light-excited diffuser can be excited very well. The purpose is to produce a light emitting diode display.

In order to achieve the above object, the present invention provides a color filter for converting color of the light emitted by the light emitting diode into red, green, and blue, and a full color organic light emitting diode display in which a substrate is formed in front of the color filter. ;

A black mattress that blocks light between respective color filters is formed behind the substrate, and a layer of light excitation diffuser is formed between the color filter and the light emitting diode;

The light emitting diode includes an organic light emitting layer comprising a hole injection layer, a hole transport layer, a light emitting layer, a hole limiting layer, an electron transport layer, an electron injection layer sequentially stacked; A full-color organic light emitting diode display structure using a photoexcitation diffuser material, wherein a transparent negative electrode and a high reflecting positive electrode are respectively formed on both sides of the organic light emitting layer to emit light in the direction of the negative electrode;

A black matrix pattern forming step of forming a black matrix layer in a predetermined pattern by using the upper surface of the transparent substrate; A color filter forming step of uniformly arranging the color filters by exposing with a photoresist having red, green, and blue color filters on the upper surface of the substrate according to the pattern of the black matrix; A photoexcitation material coating step of uniformly applying a transparent photoresist including a photoexcitation diffusing material and a diffusing material to the upper surface of the substrate on which the color filter is formed; A heating step of heating using a hot plate or an oven; Photoexcitation is characterized in that a series of steps of the development step of aligning the substrate subjected to the heating step by using the same photo mask as the color filter and then exposing the developer to develop for a predetermined time after exposure to ultraviolet light The present invention relates to a method for manufacturing a full color organic light emitting diode display using a diffusion material.

Accordingly, the configuration of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce.

1 is a conceptual diagram illustrating a color filter layer according to an embodiment of the present invention, a color filter 3 for converting light from the light emitting diodes 2 into red, green, and blue colors, and the color filter 3. A full color organic light emitting diode display in which a substrate (1) is formed in front of a; A black mattress 310 is formed at the rear of the substrate 1 to block light between each of the color filters 31, 32, and 33, and between the color filters 31, 32, and 33 and the light emitting diodes 2. A photoexcited material 320 layer is formed thereon; The light emitting diode 2 may include a hole injection layer 231, a hole transport layer 232, a light emitting layer 233, a hole blocking layer 234, an electron transport layer 235, and an electron transport layer 235. an organic light emitting layer 23 including a transport layer) and an electron injection layer 236 sequentially stacked; The full color organic light emitting diode display structure is characterized in that transparent negative electrodes 24 and high reflecting positive electrodes 22 are formed on both sides of the organic light emitting layer 23 to emit light toward the negative electrode 24.

In general, a method of passing the light emitted from the light emitting diodes 2 through each of the color filters 31, 32, and 33 is a resolution of the color filters 31, 32, and 33 regardless of the integrated number of the light emitting diodes 2. It is easy to manufacture in high resolution because of the integration number of the light) but the light efficiency is reduced and the color change is severe according to the voltage increase, but in the present invention, the light is excited and amplified by the light excitation diffuser 320 to improve the efficiency. In addition, the black mattress 310 was formed in order to prevent overlapping of light with the adjacent color filters 31, 32, and 33 to enable clear high resolution.

Photoexcitation material 320 that can be used in the present invention largely includes an inorganic fluorescent material, an organic fluorescent material, an organic pigment, a nano material. Representative photo-excited inorganic fluorescent materials are composed of phosphors doped with cerium (Y ₃ ) in Y ₃ Al ₅ O ₁₂ (YAG) in garnet-based (Gd) materials. Inorganic fluorescent materials that can be used in the present invention are specifically (Y _1-xy Gd _x Ce _y ) ₃ (Al _1-z Ga _z ) ₅ O ₁₂ ; (Gd _1-x Ce _x ) Sc ₂ Al ₅ O ₁₂ ; (x + y ?? 1; 0 ?? x ?? 1; 0 ?? y ?? 1; 0 ?? z ?? 1) SrB ₄ O ₇ : Sm ²⁺ ; SrGa ₂ S ₄ : Eu ²⁺ ; BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ; (Sr, Mg, Ca, Ba, Zn) ₂ P ₂ O ₇ : Eu, Mn; (Ca, Sr, Ba, Mg) ₅ (PO ₄ ) ₃ (Cl, F, OH): Eu, Mn; (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) ₆ (F, Cl, Br, OH): Eu ²⁺ ; (Sr, Ca, Ba, Mg) ₁₀ (PO ₄ ) ₆ (F, Cl, Br, OH): Eu ²⁺ , Mn ²⁺ ; (Sr, Ba, Ca) MgAl ₁₀ O ₁₇ : Eu, Mn; (Ba, Sr, Ca) MgAl ₁₀ O ₁₇ : Eu ²⁺ ; _{(Sr, Ca) 10 (PO} 4) 6 .nB 2 O 3: Eu 2+; ( stage, 0 <n <1) Sr 4 Al 14 O 25: Eu; 3.5MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ ; ZnS: Cu, Al; ZnS: Ag, Al; CaS: Ce; SrS: Ce; SrS: Eu; MgS: Eu; CaS: Eu; (Y, Tb, Lu, La, Gd) ₃ (Al, Sc, Ga, In) ₅ O ₁₂ : Ce, Pr, Sm; BaAl ₈ O ₁₃ : Eu; 2SrO.0.84P ₂ O ₅ .0.16B ₂ O ₃ : Eu; Sr ₂ Si ₃ O ₈ .2SrCl ₂ : Eu; Ba ₃ MgSi ₂ O ₈ : Eu ²⁺ ; Sr ₄ Al ₁₄ O ₂₅ : Eu ²⁺ ; (Ba, Sr, Ca) Al ₂ O ₄ : Eu ²⁺ ; (Y, Gd, Lu, Sc, La) BO ₃ : Ce ³⁺ , Tb ³⁺ ; (Ba, Sr, Ca) ₂ SiO ₄ : Eu ²⁺ ; (Ba, Sr, Ca) ₂ (Mg, Zn) Si ₂ O ₇ : Eu ²⁺ ; (Sr, Ca, Ba) (Al, Ga, In) ₂ S ₄ : Eu ²⁺ ; (Y, Gd, Tb, La, Sm, Pr, Lu) _x (Al, Ga, In) _y O ₁₂ : Ce ³⁺ ; (2.8 ?? x ?? 3; 4.9 ?? y ?? 5.1) (Ca, Sr, Ba) ₈ (Mg, Zn) (SiO ₄ ) ₄ (Cl, F) ₂ : Eu ²⁺ , Mn ²⁺ ; (Gd, Y, Lu, La) ₂ O ₃ : Eu ³⁺ , Bi ³⁺ ; (Gd, Y, Lu, La) ₂ O ₂ S: Eu ³⁺ , Bi ³⁺ ; (Gd, Y, Lu, La) VO ₄ : Eu ³⁺ , Bi ³⁺ ; SrY ₂ S ₄ : Eu ²⁺ ; CaLa ₂ S ₄ : Ce ³⁺ ; (Ca, Sr) S: Eu ²⁺ ; (Ba, Sr, Ca) MgP ₂ O ₇ : Eu ²⁺ , Mn ²⁺ ; ZnCdS and the like and a mixture of two or more selected therefrom.

The main wavelength of light emitted from the photoexcitation material depends on the excitation material described above.

Ce ³⁺ emission depending on the garnet composition can emit light from green (~ 540 nm; YAG: Ga, Ce) to red (~ 600 nm; YAG: Gd, Ce) without decreasing the light efficiency. have. In addition, a representative inorganic phosphor for emitting deep red is SrB ₄ O ₇ : Sm ²⁺ . Sm ²⁺ mainly contributes to the red wavelength. In particular, the deep red inorganic phosphor absorbs the entire visible light region of 600 nm or less and emits light having a deep red color, that is, a wavelength of 650 nm or more. A representative inorganic phosphor for emitting green light is SrGa ₂ S ₄ : Eu ²⁺ . Such a green inorganic phosphor absorbs light of 500 nm or less and emits a main wavelength of 535 nm. A representative inorganic phosphor for emitting blue light is BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ . Such a blue inorganic phosphor absorbs light of 430 nm or less and emits a main wavelength of 450 nm. Organic fluorescent materials may emit blue, green, and red light. For example, (4,4'-bis (2,2-diphenyl-ethen-1-yl) diphenyl (DPVBi), bis (styryl) amine (DSA) system, and the like are typical organic materials emitting blue light. , Tris (8-quinolinato) aluminum (III) (Alq ₃ ), cumarin 6, 10- (2-benzothiazolyl) -1,1,7,7-tetramethyl-2,3,6 , 7-tetrahydro-1 H, 5 H, 11 H-[1] benzopyrano [6,7,8-ij] -quinolizine-11-one (C545T) and quinacridone luminesce green In addition, 4-dicyanomethylene-2-methyl-6- (zulolidin-4-yl-vinyl) -4H-pyran (DCM2) and 4- (dicyanomethylene) -2- Methyl-6- (1,1,7,7-tetramethylzulolidil-9-enyl) -4H-pyran (DCJT), 4- (dicyanomethylene) -2-tertbutylbutyl-6- (1, 1,7,7-tetramethylzololidyl-9-enyl) -4H-pyran (DCJTB) and the like are representative organic materials that emit red color.

The organic pigments usable in the present invention include azo pigments such as insoluble azo pigments, azo lake pigments, condensed azo pigments and metal salt azo pigments. Examples of the phthalocyanine salts include copper phthalocyanine, halogenated copper phthalocyanine, metal phthalocyanine, and copper phthalocyanine lake pigments. The dye lake pigments include acid fuel lakes and basic dye lake pigments, and the condensed polycyclic pigments include anthraquinone, thioindigo, perylene, prinon, quinacridone, dioxazine, isoindolinone, Isoindoline, quinaphthalone, and the like, and other pigments include nitroso pigments, alizarin, metal complex salt azomethine, aniline black, alkali blue, and fluorescence fluorescence. Nano-scale metals and nano-composites are used as materials such as quantum dots of nano metals and composite materials. Platinum, gold, silver, nickel, magnesium, palladium, etc. are used as nano metals. Composite materials include cadmium sulfide (CdS), cadmium selenide (CdSe), zinc sulfide (ZnS), zinc selenide (ZnSe), indium phosphite (InP), titanium oxide (TiO ₂ ), zinc oxide (ZnO), tin Oxides (SnO), silicon oxides (SiO ₂ ), magnesium oxides (MgO) and the like.

The light diffusion material of the present invention is largely divided into a polymer diffusion agent and an inorganic diffusion agent. Transparent diffusing agents include organic transparent diffusing agents such as acrylic resins, styrene resins and silicone resins, and inorganic transparent diffusing agents such as synthetic silica, glass beads, and diamond, and white diffusing agents include silicon oxide (SiO ₂ ) and titanium oxide (TiO). ₂ ), inorganic oxides including zinc oxide (ZnO), barium sulfate (BASO ₄ ), calcium carbonate (CaSO ₄ ), magnesium carbonate (MgCO ₃ ), aluminum hydroxide (Al (OH) ₃ ), clay, etc. It is a substance.

The hole injection layer 231 may be formed by using a material such as CuPc (Phthalocyanine Copper) or MT-DATA (4,4'4 "-Tris (N-3-methylphenyl-N-phenyl-amino) triphenylamine). The hole transport layer 232 is deposited on the top of the electrode 22, and the hole transport layer 232 is NPB (4,4'-bis [N- (1-naphthyl) -N-phenyl-amino] biphenyl) or TPD (N, N '). It is deposited on the upper surface of the hole injection layer 231 using a material such as -diphenyl-N, N'-bis (3-methylphenyl) -1,1-biphenyl-4,4'-diamine. An organic emitting layer 233 is formed on top of 232. The organic light emitting layer 233 is formed of a monochromatic blue organic low molecular luminescent material, as well as other colors such as small amounts of green and red. A small amount of the organic low molecular luminescent material may be added to the blue organic low molecular luminescent material to form a color, that is, the organic light emitting layer 233 has a small amount of the red organic low molecular luminescent material and the blue organic low molecular luminescent material. Is used, DCJTB (4-Dicyanomethylene) -2-tert-butyl-6- (1,1,7,7-tetramethyljulolidyl-9-enyl) -4H-pyran) or DCM series (4- (Dicyanomethylene)- 2-methyl-6- (4-dimethylaminostyryl) -4H-pyran derivative) or Alq3 (tris (8-hydroxyquinoline) aluminum), which is a substance that emits green light, such as Nile Red A small amount is added to a material having a large energy band gap, such as CBP (4,4'-Bis (carbazol-9-yl) biphenyl), and a blue organic low molecular luminescent material, that is, DPVBi (4,4'-bis (2,2- diphenylvinyl) biphenyl) or DCS (4,4-Bis [carbazoly- (9)]-stilbene). In addition, when the organic light emitting layer 233 is made of a small amount of green organic low molecular luminescent material and blue organic low molecular material, Alq3 material is used or IrPPy3 (Iridium tris (phenylpyridine)) or C6 (Coumarin 6 or 3- (2-). Benzothiazoly) -7-diethylaminocoumarin)) or C545T (10-2- (Benzothiazolyl) -2,3,6,7-tetrahydro-1,1,7,7, -teramethyl-1H, 5H, 11H- [1] A green organic dopant such as benzopyrano [6,7,8-ij] quinolizin) is added to Alq3, a material that emits green light, or a material having a large energy band gap, such as a small amount of CBP. It is preferably formed before or after DPVBi (4,4'-bis (2,2-diphenylvinyl) biphenyl) or DCS (4,4-Bis [carbazoly- (9)]-stilbene). In addition, when the organic light emitting layer 233 is made of a blue organic low molecular luminescent material, DPVBi (4,4'-bis (2,2-diphenylvinyl) biphenyl) or DCS (4,4-Bis [carbazoly- (9)). ] -stilbene) or F2Irpic (Bis (3,5-difluoro-2- (2-pyridyl) phenyl- (2-caboxypyridyl)) iridium (III)) blue dopant with energy band gap It is preferably formed by adding a small amount to a large material, such as CBP.

The hole limiting layer 234 is BAlq (aluminum (III) bis (2-methyl-8-quinolinato) 4-phenylphenolate), but BCP (bathocuproine or 2,9-Dimethyl-4,7-diphenyl-1,10- It is deposited on the upper surface of the organic light emitting layer 233 using a material such as phenanthroline or CBP, Alq3 or Bphen (4,7-Diphenyl-1,10-phenanthroline on the upper surface of the hole limiting layer 234 ), An electron transport layer 235 is fabricated using PBD (2- (4-Biphenyl) -5- (p-tert-butylphenyl) -1,3,4-oxadiazole). The electron injection layer 236 is deposited on the upper surface of the electron transport layer 235 by using lithium fluoride (LiF) or cesium fluoride (CsF).

Forming the organic light emitting layer 23 including the hole injection layer 231, the hole transport layer 232, the light emitting layer 233, the hole limiting layer 234, the electron transport layer 235, and the electron injection layer 236. In order to achieve this, a vacuum deposition method using an open shadow mask, a deposition method using a laser beam, a printing method using an ink-jet, or a deposition method using color patterning can be manufactured. It is not specifically limited to either method.

On the other hand, the configuration of the light emitting diode 2 is changed according to the position of the negative electrode 24 and the positive electrode 22 formed on both sides of the organic light emitting layer 23, the positive electrode 22 is made of a material having a high reflectance When formed, the transparent substrate 21 is stacked next to the transparent negative electrode 24. When the positive electrode 22 is formed of a transparent material, the transparent substrate 21 is positioned behind the positive electrode 22.

3A is a conceptual diagram illustrating an embodiment fabricated in a bottom method, in which a black matrix 310 is formed in a predetermined pattern on a substrate 1 and a color filter 3 including a light excitation diffusion layer 320 in the formed pattern. Is formed, and a protective layer having a high transmittance is formed on the color filter 3, and a positive electrode 22, a blue organic light emitting layer 23, and a cathode 24 are formed on the protective layer, respectively. Finally, an embodiment in which one or more protective layers are formed is shown. In this case, it is preferable to use indium tin oxide (ITO) as the positive electrode.

3B is a conceptual diagram illustrating an embodiment manufactured in a top manner, wherein an anode electrode is patterned on an upper surface of the transparent substrate 21, and the anode electrode forms indium tin oxide (ITO) on an upper surface of aluminum or silver film. It is preferable that the conductive film has a high reflectance and a high work function. On the upper surface of the electron injection layer 236, a negative electrode 24 formed of a transparent cathode having a low work function is formed, and the cathode has a low work function metal film such as a magnesium film, a calcium film, a silver film, or a magnesium film. After forming a thin mixture of silver films, a transmissive conductive film, such as an ITO film or an IZO film, is deposited so that light is emitted to the cathode electrode.

4 is a conceptual diagram showing an embodiment in which a light emitting diode is manufactured as a microcavity organic light emitting diode, and when the light emitting diode 2 is manufactured as a microcavity organic light emitting diode, blue light may be emitted in deep blue. The color conversion efficiency in the photoexcitation diffuser can be increased, and the color of blue is also excellent. The microcavity structure has a semi-transmissive metal layer 221, a transparent space layer 222, and a semi-transmissive metal layer 221 stacked on the positive electrode 22, and two reflective plates 241 and a transparent space layer ( 242 and the semi-transmissive metal layer 243 may be formed. In this case, a metal having high reflectance, such as aluminum (Al) or silver (Ag), is mainly used as the reflecting plate 241, and an indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) is used as the semi-transmissive metal. Translucent metals are mainly used. In addition, as the transparent space layer, a transparent organic material such as NPB or transparent inorganic material such as SiOx or SixNy is mainly used.

5 is a block diagram showing a manufacturing method according to an embodiment of the present invention, comprising: forming a black matrix pattern 41 using a transparent matrix upper surface in a predetermined pattern; A color filter forming step (42) of uniformly arranging the color filters by exposing with a photoresist having red, green and blue color filters on the upper surface of the substrate according to the pattern of the black matrix; An optical excitation material applying step (43) uniformly applied to the upper surface of the substrate on which the color filter is formed by using a transparent photoresist including a light excitation diffusing material and a diffusing material; A heating step 44 of heating using a hot plate or an oven; After the heating step 44 is aligned with a substrate using the same photo mask as the color filter, and then exposed to ultraviolet light, a series of development steps 45 of developing the developer for a predetermined time are sequentially performed. Is manufactured with load.

6 is a block diagram showing a manufacturing method according to another embodiment of the present invention, wherein the light emitting diode 2 has a transparent space layer 222 formed thereon and an organic light emitting layer 23 and a reflecting plate 241 below. An embodiment is characterized in that it is further configured. Its manufacturing method is a sputtered metal having a high work function, such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), formed on the upper surface of the color excitation diffuser and the color filter substrate formed by the developing step 45. An anode electrode forming step 46 for depositing an anode electrode and depositing the anode electrode on the upper surface of the color filter using an exposure process; The organic light emitting layer forming step 47 for depositing the organic light emitting layer and the metal negative electrode layer by the vacuum thermal evaporation method as shown on the patterned anode top was further shown.

When the + and-powers are applied to the anode and cathode electrodes, respectively, blue light is emitted from the organic light emitting layer, and the emitted blue light is transferred to the light excitation diffusion material layer through the anode, which is a transparent electrode. The blue light that reaches is partially transmitted, and the other part is energized by the photoexcitation diffuser to excite the light, and then becomes white light having blue, green, and red colors. After passing through the light excitation diffusion material and passing through the color filter, blue, green, and red colors are respectively obtained to implement a full color organic light emitting diode display. In this case, an embodiment of preventing leakage current from occurring by using an insulating photoresist and a cathode separator photoresist on the anode electrode and separating the cathodes from each other is also a preferred embodiment. will be.

FIG. 7 shows a spectrum of a conventional blue organic light emitting diode and a microcavity organic light emitting diode, and when fabricated with a microcavity organic light emitting diode, the light excitation is good, making it easy to match white color, and the light amplification is increased. It can be seen.

FIG. 8 illustrates a spectrum after passing through a blue organic light emitting diode and a light excitation diffusing material, wherein blue light is emitted through all of the wavelengths of 400 nm to 700 nm depending on the wavelength distribution. Able to know. In the experiment, the photoexcitation diffuser was used as YAG 5% and ZnCdS 1%, and 1% SiO2 ball was used as the diffusing agent. At this time, it was confirmed that the photoexcitation diffuser has an advantage that various colors can be produced depending on the concentration of the photoexcitation diffuser and the concentration of the diffusing agent.

FIG. 9 is a spectrum in which the blue organic light emitting diode and the photoexcited material produced in FIG. 8 pass through a color filter to give blue, green, and red colors, respectively, and FIG. 10 is a graph showing the spectrum of FIG. 9 in color coordinates.

As shown in FIG. 9 and FIG. 10, the color purity is widely spread, so that many colors can be expressed. The color fineness mask is superior to the organic light emitting diode using the conventional high definition shadow mask method. It can be used to produce high resolution, large area full color organic light emitting diode displays.

FIG. 11 illustrates a spectrum of a conventional blue organic light emitting diode and a blue organic light emitting diode in which red is added, and FIG. 12 illustrates the efficiency of FIG. 11.

Referring to FIG. 12, it can be seen that the efficiency of the blue organic light emitting diode added with red is very high. When the organic light emitting diode is manufactured based on the graph, a high efficiency full color organic light emitting diode display can be manufactured.

As described above, according to the present invention, the full color organic light emitting diode display using the conventional shadow mask is difficult to achieve high resolution and large area due to the limitation of the line width and the warpage of the shadow mask. The new full-color organic light emitting diode display uses the photolithography process, which has the effect of high resolution and large area.

In addition, the conventional full color organic light emitting diode using a white organic light emitting diode and a color filter is capable of high resolution using a photolithography process, but the color purity of the white organic light emitting diode is low, and the efficiency of white light itself is not only good, The white light from the diodes passes through the color filter, which greatly reduces the efficiency. In contrast, the new full color organic light emitting diode display using the excitation material and the color filter of the present invention improves the efficiency by preventing the decrease in efficiency by inserting the excitation material before passing through the color filter.

In addition, the conventional full-color organic light emitting diode using the blue organic light emitting diode and the color conversion material has a problem in that the efficiency of blue light itself is inferior, and the color conversion efficiency for converting the color in the color conversion material is inferior, and the high cost of the color conversion material itself is achieved. Due to this, it was difficult to manufacture a full color organic light emitting diode display. However, the use of a small amount of green and red added blue of the present invention not only greatly increases the luminous efficiency but also excites the light in the light excitation diffuser and red each through the color filter. The color conversion efficiency is also high as it can lead to green, blue, and green.

In addition, when the microcavity structure is used when fabricating the organic light emitting diode of the present invention, the photoexcitation and light emission are excellent in the photoexcitation diffusing material, resulting in high efficiency and high color reproducibility. When the organic light emitting diode is manufactured by vacuum thermal evaporation, the thickness can be reduced.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is only an example, and those skilled in the art may make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

A color filter 3 for converting light from the light emitting diodes 2 into red, green, and blue colors, and a full color organic light emitting diode display in which a substrate 1 is formed in front of the color filter 3; In; A black mattress 310 is formed at the rear of the substrate 1 to block light between each of the color filters 31, 32, and 33, and between the color filters 31, 32, and 33 and the light emitting diodes 2. A photoexcitation diffuser layer 320 is formed thereon; The light emitting diode 2 includes a hole injection layer 231, a hole transport layer 232, a light emitting layer 233, a hole limiting layer 234, an electron transport layer 235, and an electron injection layer 236. An organic light emitting layer 23; Full color organic light emitting diodes using photoexcitation diffusion materials, characterized in that the transparent positive electrode 22 and the high reflectance negative electrode 24 are formed on both sides of the organic light emitting layer 23, respectively, and emit in the direction of the positive electrode 22. Display structure. The positive electrode 22 is formed by stacking a transparent space layer 222 between two semi-transmissive metal layers 221, and a reflecting plate 241 and a transparent space layer 242 on the negative electrode 24. Full-color organic light emitting diode display structure using a light excitation diffuser material, characterized in that the semi-transmissive metal layer (243) is laminated. 2. The light emitting diode (2) of claim 1, wherein the transparent space layer (222) is formed on the upper side and the organic light emitting layer 23, the reflecting plate 26 further comprises a light excitation diffuser material Used full color organic LED display structure. The method according to any one of claims 1 to 3, wherein the black matrix 310 is formed in a predetermined pattern on the substrate 1, and the formed color filter 3 includes a light excitation diffusion layer. A passivation layer 27 having a high transmittance is formed on the color filter 3, and a positive electrode 22, a blue organic light emitting layer 23, and a cathode 24 are disposed on the passivation layer 27. And a full color organic light emitting diode display structure using photoexcitation diffusing materials, each of which is formed in the form of a film and at least one passivation layer is formed. A black matrix pattern forming step 41 of forming a black matrix layer in a predetermined pattern by using the upper surface of the transparent substrate; A color filter forming step (42) of uniformly arranging the color filters by exposing with a photoresist having red, green and blue color filters on the upper surface of the substrate according to the pattern of the black matrix; An optical excitation material applying step (43) uniformly applied to the upper surface of the substrate on which the color filter is formed by using a transparent photoresist including a light excitation diffusing material and a diffusing material; A heating step 44 of heating using a hot plate or an oven; After the heating step 44, the substrate is aligned using the same photo mask as the color filter, and then exposed to ultraviolet light, and then a developing step 45 of developing the developer for a predetermined time is sequentially performed. A method for manufacturing a full color organic light emitting diode display using a photoexcitation diffusing material characterized by a load. The anode electrode according to claim 4, wherein an indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) is deposited on the upper surface of the photoexcitation diffuser and the color filter substrate formed by the developing step 45. Forming an anode electrode and leaving the anode electrode only on the upper surface of the color filter using an exposure process; An organic light emitting layer forming step 47 for depositing an organic light emitting layer and a metal negative electrode layer by vacuum thermal evaporation is further formed on the patterned anode top surface. .

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