JP2003208980A - Color conversion filter board and color conversion color display using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color conversion system color display of which the device life is improved by suppressing the rise of the device temperature at the time of organic EL device drive. <P>SOLUTION: It is the color conversion filter board, which consists of a transparent support board, a single, or two or more kinds of color conversion filter layers which is arranged in this support board, and is constituted by making a photo polymerization nature resin film of film thickness of 5 μm or more, which contains at least one kind of fluorescent dye, form in a desired pattern, and at least a gas barrier layer, which is arranged between these color conversion filter layers, covers a heat releasing layer excellent in thermal conductivity and this color conversion filter layer, and is formed transparently and evenly. Moreover, it is the color conversion system color display using the color conversion filter board. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter which enables high-definition multicolor display with excellent environmental resistance and productivity, and an organic multicolor light emitting display device having the color filter. In detail, image sensor,
Color filters for display of personal computers, word processors, televisions, facsimiles, audio, video, car navigation, electric desk calculators, telephones, portable terminals, industrial measuring instruments, etc., and organic multicolor light emitting displays equipped with the color filters. The present invention relates to a device, and more particularly to an organic multicolor light emitting display using a color conversion method.

[0002]

2. Description of the Related Art In recent years, the diversification of information is rapidly progressing. Among these, display devices in the information field are
“Light, thin, and excellent” are required, and active development is underway toward further lower power consumption and faster response. In particular, high-definition full-color display devices have been widely devised.

It has a thin film laminated structure of organic molecules having excellent viewing angle dependence and high-speed response with respect to a liquid crystal display device and the like, and is 100 at an applied voltage of 10V.
A laminated organic electroluminescence (hereinafter, referred to as organic EL) element that emits light with high brightness of 0 cd / m ² or more is
Reported by Tang et al. (Appl. Phys. Lett., 51, 913 (19
87)), the research for organic EL devices has been actively conducted for practical use. Also, similar devices using organic polymer materials are being actively developed.

Since an organic EL element can realize a high current density at a constant voltage, it can be expected to have higher luminous brightness and luminous efficiency than an inorganic EL element or an LED. The display element includes (1) high brightness and high contrast,
(2) Low voltage drive and high luminous efficiency, (3) High resolution,
It has excellent features such as (4) wide viewing angle, (5) high response speed, (6) miniaturization and colorization, and (7) lightness and thinness. From the above points, application to “flat, light, thin, excellent” flat panel displays is expected.

A green monochrome organic EL display for mounting on a car was already commercialized by Pioneer in November 1997. In the future, in order to meet the needs of diversifying society, there is an urgent need for practical use of organic EL displays having long-term stability and high-speed responsiveness and capable of multicolor display or high-definition full-color display.

One example of a method for making an organic EL display multi-colored or full-colored is to separate and arrange three primary color light emitters of red (R), green (G), and blue (B) in a matrix form. This is a method of emitting light. JP-A-57
See, for example, JP-A-157487, JP-A-58-147989, and JP-A-3-214593. When using an organic light emitting element for colorization, RG
It is technically difficult and cannot be manufactured at low cost because the three kinds of light-emitting materials of B have to be arranged on the matrix with high precision. In addition, since the three kinds of light emitting materials have different lifespans (luminance change characteristics), there is a drawback that the chromaticity shifts due to long-term use.

Further, there is a method in which a color filter is used for a backlight which emits white light and three primary colors are transmitted (JP-A-1-315988, JP-A-2-273496, JP-A-3-194888, etc.). Although known, a long-life and high-luminance white EL organic EL light-emitting element necessary for obtaining high-luminance RGB light has not yet been obtained.

Alternatively, there is also known a method in which the light emitted from the light-emitting body is absorbed by the fluorescent materials arranged in a plane, and the fluorescent materials emit multicolored fluorescence (Japanese Patent Laid-Open No. 3-152897, etc.). There is. Here, a method of emitting multicolor fluorescence from a certain light-emitting body using a phosphor is a CRT,
Has a track record in applications such as plasma displays.

In recent years, a color conversion system using a fluorescent material that absorbs light in the light emitting region of an organic light emitting element and emits fluorescence in the visible light region as a filter (Japanese Patent Laid-Open Nos. 3-152897 and 5-258860). Gazette, etc.) is disclosed. Since the emission color of the organic light emitting element is not limited to white,
An organic light emitting device having higher brightness can be applied to the light source, and a color conversion method using an organic light emitting device emitting blue light (Japanese Patent Laid-Open Nos. 3-152897, 8-286033, and 9-208944). No.
The wavelength of blue light is converted into green light and red light. By patterning a fluorescent dye conversion film containing such a fluorescent dye with high precision, a full-color light emitting display can be constructed even with weak energy rays such as near-ultraviolet light or visible light of a light emitting body.

An important issue in practical use as a color display is that it has a fine color display function and long-term stability including color reproducibility (Functional Material, Vol. 18, No. 2, 96). See page). However, the color organic EL element has a problem that the current-luminance characteristic is deteriorated by driving for a certain period.
Active research is being conducted in various places regarding the performance degradation of organic EL devices, and various causes have been announced so far. In particular, since the organic EL layer including the light emitting layer is made of a material having low heat resistance, performance deterioration due to heat generated when the device is driven is a serious problem.

The organic light emitting device excites a light emitting material by recombination of electrons and holes injected from an electrode to obtain light emission. However, the recombination probability of electrons and holes is not 100%, and the part of the charges flowing in the element that does not contribute to the recombination is released as heat. Also, no excited luminescent material can be converted into light with 100% efficiency, and a part of energy not released as light is released as heat. Therefore, the organic EL element generates a large amount of heat when it is driven, and in order to prolong the life of the element composed of an organic material having low heat resistance as described above, it is very important to take measures against heat. is there.

As a measure against heat generated when the organic light emitting element is driven,
Several methods have been published so far. For example, JP-A-9-35868 and JP-A-2000-
Japanese Patent No. 234918 discloses filling an outer periphery of an EL element with an inert liquid having high thermal conductivity. Alternatively, JP-A-5-101886 and 2000
Japanese Patent No. 348860 discloses forming an encapsulant having high thermal conductivity on the upper surface of an organic EL device after forming the organic EL device. Further, Japanese Patent Laid-Open No. 2001-250694 discloses disposing an inorganic material having high thermal conductivity in an insulating film that protects an end portion of a transparent conductive film.

According to these methods, it is considered that the heat when driving the organic EL element is easily transferred to the surroundings, the rise in the element temperature is suppressed, and the element life is improved. However, it cannot be said that sufficient heat countermeasures have been taken for use in a color conversion type organic color display.

FIG. 1 shows a general sectional structure of a color conversion type organic EL color display. 3 on the support substrate 1
Seed color conversion layers 2-4 are formed, and an overcoat layer 5 covers them to planarize the top surface.
In FIG. 1, most of the color conversion layers 2 to 4 and the overcoat layer 5 are formed of a polymer material, and the total film thickness is 5 μm or more. Moreover, the thermal conductivity of these is 0.
Very small, 2 W / mK or less. Therefore, as compared with the method of separately painting the three primary colors or the method of cutting white with a color filter, there is a drawback that heat transfer in the direction of the support substrate 1 is less likely to occur.

[0015]

Accordingly, the organic EL
In order to prolong the life of color conversion type organic color display using elements, it is necessary to develop more effective heat countermeasures. In particular, it is necessary to facilitate heat transfer in the direction of the substrate 1 and minimize an increase in element temperature during driving.

[0016]

Means for Solving the Problems As a result of earnest studies on a highly efficient heat radiation method to a supporting substrate side in a color display of a color conversion system, the present inventors have found that heat generated between pixels not used for display. It was devised to dissipate heat generated by the organic EL element to the substrate through the gas barrier layer and the heat dissipation layer by disposing a highly conductive material.

The color conversion filter substrate according to the first aspect of the present invention is a transparent support substrate and is disposed on the support substrate.
Film thickness of 5 μm containing at least one fluorescent dye
A single or a plurality of types of color conversion filter layers formed by forming the above photopolymerizable resin film in a desired pattern, and arranged between the color conversion filter layers, a heat dissipation layer having excellent thermal conductivity,
At least a gas barrier layer that covers the color conversion filter layer and is formed to be transparent and flat is provided. The heat dissipation layer can be formed of a metal, an alloy, an oxide, a nitride, or a polymer material in which a good heat conductor is dispersed.

The color conversion color display according to the second aspect of the present invention is a transparent electrode formed in one or a plurality of electrically independent regions on the color conversion filter substrate of the first aspect of the present invention. Layer, a light emitting layer, and a second electrode layer are laminated at least in sequence, and a desired transparent electrode layer and a desired second electrode layer are formed.
By inputting an electric signal to the pixel sandwiched by the electrode layer, the light emitting layer of the pixel is caused to emit light, and the emitted light passes through the gas barrier layer of the portion and is incident on the color conversion filter layer of the portion. The fluorescent dye in the color conversion filter layer is photoexcited and emits fluorescence to display a predetermined emission color on the supporting substrate side.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A. Color Conversion Filter Substrate An example of the color conversion filter substrate of the present invention is shown in FIG. In FIG. 2, a red conversion layer 2, a green conversion layer 3, and a blue conversion layer 4 are formed on a supporting substrate 1 with predetermined patterns, and a heat dissipation layer 6 is formed between these patterns. . As described below, the green color conversion layer 3 may be a green color filter layer. The blue conversion layer 4 is preferably a blue filter layer. A gas barrier layer 7 is formed so as to cover these conversion filter layers, and the top surface thereof is flat. However, in FIG. 2, a gas barrier layer having a two-layer structure including the first gas barrier layer 7a and the second gas barrier layer 7b is shown. In the following specification, the first gas barrier layer 7a and the second gas barrier layer 7b may be collectively referred to as the gas barrier layer 7. In addition, in this specification and the drawings, the same functional portions are denoted by the same reference numerals. Hereinafter, each layer will be described in detail.

1. Color Conversion Layer 1) Organic Fluorescent Dye In the present invention, the organic fluorescent dye absorbs light in the near ultraviolet region to the visible region, particularly light in the blue to blue-green region emitted from the luminescent material, and fluoresces visible light of different wavelengths. It emits light as. Preferably, at least one kind of fluorescent dye that emits fluorescence in the red region is used, and it may be combined with one or more kinds of fluorescent dye that emits fluorescence in the green region. That is, when an organic light-emitting element that emits light in the blue to blue-green range is used as a light source, if light from the element is passed through a simple red filter to obtain light in the red range, light having a wavelength in the red range is originally used. Since the amount of light is small, the output light becomes extremely dark.

Therefore, by converting the light in the blue to blue-green region from the device into the light in the red region by the fluorescent dye, it is possible to output the light in the red region having sufficient intensity. On the other hand, the light in the green region may be converted into the light in the green region by another organic fluorescent dye and output in the same manner as the light in the red region. Alternatively, if the emission of the device contains sufficient light in the green region,
The light from the device may simply be output through the green filter. Further, regarding the light in the blue region, it is possible to output the light of the organic light emitting element through a simple blue filter.

Examples of fluorescent dyes that absorb light in the blue to blue-green range emitted from the luminescent material and emit fluorescence in the red range include, for example, rhodamine B, rhodamine 6G, rhodamine 3B, rhodamine 101, rhodamine 110, sulforhodamine, and the like. Rhodamine-based dyes such as Basic Violet 11 and Basic Red 2, cyanine-based dyes, 1
-Ethyl-2- [4- (p-dimethylaminophenyl)
Examples include pyridine-based dyes such as -1,3-butadienyl] -pyridinium perchlorate (pyridine 1), and oxazine-based dyes. Further, various dyes (direct dyes, acid dyes, basic dyes, disperse dyes, etc.) can be used as long as they have fluorescence.

Examples of fluorescent dyes which absorb light in the blue to blue-green range emitted from the light-emitting body and emit fluorescence in the green range include 3- (2'-benzothiazolyl) -7-
Diethylamino-coumarin (coumarin 6), 3- (2 '
-Benzimidazolyl) -7-diethylamino-coumarin (coumarin 7), 3- (2'-N-methylbenzimidazolyl) -7-diethylamino-coumarin (coumarin 30), 2,3,5,6-1H, 4H-tetrahydro-
8-trifluoromethylquinolidine (9,9a, 1-g
h) Coumarin-based dyes such as coumarin (coumarin 153), basic yellow 51 which is a coumarin dye-based dye, and naphthalimide-based dyes such as Solvent Yellow 11 and Solvent Yellow 116. Further, various dyes (direct dyes, acid dyes, basic dyes, disperse dyes, etc.) can be used as long as they have fluorescence.

The organic fluorescent dye used in the present invention includes polymethacrylic acid ester, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer resin, alkyd resin, aromatic sulfonamide resin, urea resin, melamine resin, benzoguanamine resin and An organic fluorescent pigment may be prepared by kneading in advance a mixture of these resins or the like to form a pigment. Also,
These organic fluorescent dyes and organic fluorescent pigments (herein,
These two are collectively referred to as an organic fluorescent dye) and may be used alone or in combination of two or more in order to adjust the hue of fluorescence.

The organic fluorescent dye used in the present invention is used in an amount of 0.01 to 5 with respect to the color conversion layer based on the weight of the color conversion layer.
Mass%, more preferably 0.1 to 2 mass%.
If the content of the organic fluorescent dye is less than 0.01% by mass, sufficient wavelength conversion cannot be performed, or if the content exceeds 5%, the color conversion efficiency decreases due to the effect of density quenching. Bring

2) Matrix Resin Next, the matrix resin used in the color conversion layer of the present invention is a photocurable or photothermal combined curable resin (resist).
Is subjected to light and / or heat treatment to generate radical species or ionic species to polymerize or crosslink to make them insoluble and infusible. Further, in order to pattern the color conversion layer, it is desirable that the photocurable or photothermal combined curable resin is soluble in an organic solvent or an alkaline solution in an unexposed state.

Specifically, the matrix resin is obtained by photo- or heat-treating a composition film comprising (1) an acrylic polyfunctional monomer or oligomer having a plurality of acroyl groups or methacroyl groups and a photo or thermal polymerization initiator. Produced by generating photo radicals or heat radicals,
(2) A composition comprising poly (vinyl cinnamic acid ester) and a sensitizer, which is dimerized and cross-linked by light or heat treatment, and (3) a composition film comprising a linear or cyclic olefin and bis azide is subjected to light or heat treatment. Generated by the generation of nitrene and cross-linked with olefin, and (4) a composition film comprising a monomer having an epoxy group and an acid generator, which generates an acid (cation) by light or heat treatment and is polymerized. Including etc. In particular, those obtained by polymerizing the composition comprising the acrylic polyfunctional monomer and oligomer (1) and a photo or thermal polymerization initiator are preferable. Because the composition is capable of high-definition patterning,
Also, after polymerization, reliability such as solvent resistance and heat resistance is high.

The photopolymerization initiator, sensitizer and acid generator which can be used in the present invention are preferably those which initiate polymerization by light of a wavelength which is not absorbed by the fluorescent conversion dye contained therein. In the fluorescence conversion filter layer of the present invention, a photopolymerization initiator and a thermal polymerization initiator are added when the resin itself in the photocurable or photothermal combined curable resin can be polymerized by light or heat. It is also possible not to.

As the matrix resin (color conversion layer), a solution or dispersion liquid containing a photocurable or photothermal combined curable resin, an organic fluorescent dye and an additive is applied on a supporting substrate to form a resin layer. And a desired portion of the photo-curable or photo-heat-and-curable resin is exposed to light to be polymerized. After exposing the desired portion to insolubilize the photocurable or photothermal combined curable resin,
Perform patterning. The patterning can be carried out by a conventional method such as removing the resin in the unexposed portion using an organic solvent or an alkaline solution that dissolves or disperses the resin in the unexposed portion.

2. Heat-Dissipating Layer The material for the heat-dissipating layer is not particularly limited as long as it has high thermal conductivity and does not adversely affect the characteristics of the color conversion layer, and may be solid or liquid. However, as an example, a metal or alloy that is a good conductor of heat can be used. Metals and alloys have excellent light reflection properties (strictly speaking, absorption and re-emission properties in the entire wavelength range), and also serve as a light reflection layer that improves the extraction efficiency of the color conversion layer. It is suitable as a layer material. The heat dissipation layer can be formed from any metal or alloy.
Examples of preferred metals or alloys are Al, Si, Ti
And their alloys. Also, Al
Inorganic nitride such as N, SiN, TiN, or Al ₂ O
It is also possible to use inorganic oxides such as ₃ , SiO _x , and TiO _x . Alternatively, a polymer material in which a good heat conductor is dispersed (such as a silicone resin in which fine particles of gold, silver, copper, etc. are dispersed) may be used. The heat dissipation layer formed of the above-mentioned materials typically has a thermal conductivity of 1 W / m · K or more, and preferably 10 W / m · K or more. Further, as a thermosetting resin having high heat conductivity, a mesogenic structure (biphenyl, phenylpyrimidyl,
Epoxy resins with phenylpyridyl, etc.) have recently been reported. The resin may be used as the heat dissipation layer 6 of the present invention.

The method for forming the heat dissipation layer is also not particularly limited. For example, it can be formed by a conventional method such as a dry method (sputtering method, vapor deposition method, CVD method, etc.) or a wet method (spin coating method, roll coating method, casting method, etc.). The heat dissipation layer can be formed after the pattern-shaped color conversion layer is formed, or can be formed before the color conversion layer is formed. Preferably, the heat dissipation layer is formed after forming the color conversion layer. In the formation of the heat dissipation layer, the heat dissipation layer material may be adhered in a desired pattern (for example, a sputtering method using a mask), or the material may be adhered uniformly over the entire surface and then the photolithography method or the like may be used. You may form a pattern.

3. Gas Barrier Layer The material of the gas barrier layer 7 has high transparency in the visible region (transmittance of 50% or more in the range of 400 to 700 nm), and T
g is 100 ° C. or higher, has a surface hardness equal to or higher than the pencil hardness of 2H, and can form a coating film on the color conversion layers 2 to 4 and the heat dissipation layer smoothly, and the color conversion layers 2 to 4 and A material that does not deteriorate the function of the heat dissipation layer is preferable.
Such materials include, for example, imide-modified silicone resins (JP-A-5-134112 and JP-A-7-218).
No. 717, JP-A-7-30631, etc.), an inorganic metal compound (TiO, Al ₂ O ₃ , SiO _2, etc.) dispersed in acrylic, polyimide, silicone resin, etc. (JP-A-5-119306). Japanese Patent Laid-Open No. 7-104114, etc.) and an ultraviolet curable resin. Examples of the ultraviolet curable resin that can be used for the gas barrier layer 7 include epoxy-modified acrylate resin (see JP-A-7-48424), resin having a reactive vinyl group of acrylate monomer / oligomer / polymer, resist resin (JP-A-HEI). 6-300910, JP-A-7-128519, JP-A-8-273.
394, Japanese Unexamined Patent Publication No. 9-330793, etc.), fluororesin (Japanese Unexamined Patent Publication No. 5-36475, Japanese Unexamined Patent Publication No. 9-330793), and / or
Alternatively, a thermosetting resin can be used. Alternatively, an inorganic compound formed by a sol-gel method (described in Monthly Display 1997, Vol. 3, No. 7, JP-A-8-
No. 27934, etc.) can also be used.

Further, from the viewpoint of heat dissipation toward the substrate, it is preferable to use a material having high heat conductivity. From this viewpoint, it is also possible to use an epoxy resin having the above-mentioned mesogenic structure (biphenyl, phenylpyrimidyl, phenylpyridyl, etc.) as a material for the gas barrier layer.

The method for forming the gas barrier layer 7 is not particularly limited, and for example, a dry method (sputtering method, vapor deposition method, CVD method) is used.
Method, etc.) or a wet method (spin coating method, roll coating method, casting method, etc.).

Further, the gas barrier layer 7 has an electric insulating property and a barrier property against gas and organic solvent,
A high transparency in the visible region (transmittance of 50% or more in the range of 400 to 700 nm), and the anode 8 on the gas barrier layer.
A material having a hardness (preferably a pencil hardness of 2H or more) that can withstand the film formation may be used. For example, Si
_{O x, SiN x, SiN x} O y, AlO x, TiO x, TaO
Inorganic oxides such as _x and ZnO _x or inorganic nitrides can be used. Since these inorganic oxides and inorganic nitrides have higher thermal conductivity than polymer materials, they are advantageous in terms of heat dissipation toward the substrate. Further, it is also effective to enhance the adhesiveness of the transparent electrode formed thereon. The method for forming the gas barrier layer 7 is not particularly limited, and the gas barrier layer 7 can be formed by a common method such as a sputtering method, a CVD method, a vacuum vapor deposition method, a dip method.

The above-mentioned gas barrier layer 7 may be a single layer, or a plurality of the above-mentioned materials such as the two-layer structure of the first gas barrier layer 7a and the second gas barrier layer 7b shown in FIG. The layers may be laminated.

In order to manufacture an organic EL light emitting device including a transparent electrode and an organic light emitting layer on the gas barrier layer 7 with high precision, the upper surface of the gas barrier layer 7 is preferably flat.

4. Support Substrate The support substrate 1 used for the color conversion filter of the present invention needs to be transparent to the light converted by the above-mentioned color conversion layer. The supporting substrate 1 should be able to withstand the conditions (solvent, temperature, etc.) used for forming the color conversion layer and the gas barrier layer, and preferably has excellent dimensional stability.

A preferable material for the supporting substrate 1 is
Includes resins such as glass, polyethylene terephthalate, and polymethylmethacrylate. Corning glass is particularly preferred.

5. Color Conversion Filter Substrate The color conversion filter substrate of the present invention is manufactured by forming one or a plurality of types of color conversion layers on the support substrate 1 described above in a desired pattern. The color conversion layer is formed by applying a composition containing the above-mentioned fluorescence conversion dye and a resist onto the supporting substrate 1, exposing it through a mask for forming a desired pattern, and patterning it to have a desired pattern. It is made. The color conversion layer has a film thickness of 5 μm or more, preferably 8 to 15 μm.

When manufacturing a color display,
It is preferable to form three types of color conversion layers 2 to 4 of red, green and blue. When the one that emits blue or blue-green is used as the light-emitting body, as described above, the red and green color conversion layers and the blue filter layer, or the red color conversion layer and the green and blue filter layers are used. It is also possible to form and.

The desired pattern of color conversion layers and filter layers depends on the application used. A set of rectangular or circular areas of red, green, and blue may be formed as a set and formed on the entire surface of the supporting substrate. Alternatively, one set of parallel stripes of red, green, and blue (areas having a desired width and having a length corresponding to the length of the supporting substrate 1) is set, and is formed on the entire surface of the supporting substrate. Good. It is also possible to arrange a specific color conversion layer more (numerically and in area) than the color conversion layers of other colors.

B. Color conversion type organic EL color display The color conversion type color display of the present invention includes the above-mentioned color conversion filter substrate and an organic EL light emitting element provided on the gas barrier layer 7 of the filter substrate. That is,
Light in the near-ultraviolet to visible region, preferably light in the blue to blue-green region emitted from the light-emitting element is made incident on the color conversion filter layer, and visible light of different wavelengths is emitted from the color conversion filter layer. It is a thing.

The organic EL light emitting device has a structure in which an organic light emitting layer is held between a pair of electrodes, and a hole injection layer and an electron injection layer are interposed if necessary. Specifically, one having the following layer structure is adopted.

(1) Anode / organic light emitting layer / cathode (2) Anode / hole injection layer / organic light emitting layer / cathode (3) Anode / organic light emitting layer / electron injection layer / cathode (4) anode / hole injection Layer / organic light emitting layer / electron injection layer / cathode (5) anode / hole injection layer / hole transport layer / organic light emitting layer / electron injection layer / cathode In the above layer structure, at least one of the anode and the cathode is It is desirable to be transparent in the wavelength range of the light emitted from the organic light-emitting body, and the light is emitted through the transparent electrode to be incident on the fluorescent color conversion layer. It is known in the art that it is easy to make the anode transparent, and it is desirable to make the anode transparent also in the present invention.

Known materials are used as the materials for the respective layers. In order to obtain blue to blue green light emission, as the organic light emitting layer 11, for example, a fluorescent whitening agent such as benzothiazole-based, benzimidazole-based, benzoxazole-based, a metal chelated oxonium compound, a styrylbenzene-based compound, Aromatic dimethylidin compounds are preferably used.

FIG. 3 shows an example of the organic EL color display of the present invention. FIG. 2 shows a portion corresponding to one pixel of an organic light emitting element having a plurality of pixels for use as a color conversion type multi-color or full-color display. A transparent anode (first electrode layer) 8 is formed on the gas barrier layer 7 of the color conversion filter substrate shown in FIG. 2 at a position corresponding to each of the color conversion filter layers 2, 3 and 4, and holes are formed on the transparent anode (first electrode layer) 8. The injection layer 9, the hole transport layer 10, the organic light emitting layer 11, the electron injection layer 12, and the cathode (second electrode layer) 13 are sequentially stacked.

The anode 8 is formed of a transparent electrode such as ITO, and the cathode 13 is formed of a metal electrode. The patterns of the anode 8 and the cathode 13 may be parallel stripes and may be formed to intersect with each other. In that case, the organic light emitting device of the present invention can perform matrix driving, that is, when a voltage is applied to a specific stripe of the anode 8 and a specific stripe of the cathode 13, in the organic light emitting layer 11, The part where these stripes intersect emits light. Therefore, by applying a voltage to selected stripes of anode 8 and cathode 13,
Only the part where a specific fluorescent color conversion filter layer and / or a simple filter layer is located can emit light.

Further, the anode 8 may be a uniform flat electrode having no stripe pattern, and the cathode 13 may be patterned so as to correspond to each pixel. In that case, a so-called active matrix drive can be performed by providing a switching element corresponding to each pixel.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example to which the present invention is applied will be described below with reference to the drawings.

Example 1 [Preparation of Blue Filter Layer 4] Corning Glass (50
A blue filter material (manufactured by Fuji Hunt Electronics Technology: Color Mosaic CB-7001) was applied to (× 50 × 1.0 mm) by spin coating. Next, patterning is performed by photolithography, and the line width is 0.1 mm × 0.3 mm and the pitch is 0.33 m.
m, and a blue filter layer 4 having a pattern with a film thickness of 6 μm was obtained.

[Production of Green Conversion Layer 3] As a fluorescent dye,
Coumarin 6 (0.7 parts by mass) was dissolved in 120 parts by mass of propylene glycol monoethyl acetate (PGEMA) solvent. Next, the photopolymerizable resin "V259PA /
P5 "(trade name, Nippon Steel Chemical Co., Ltd.) 100 parts by mass was added and dissolved to obtain a coating liquid. This coating liquid was applied to Corning glass (50 x
50 × 1.0 mm) was applied using a spin coating method. Next, patterning is performed by photolithography, and the line width is 0.1 mm × 0.3 mm and the pitch is 0.33 m.
m, and a green conversion layer 3 having a pattern with a film thickness of 6 μm
Got

[Preparation of Red Conversion Layer 2] As a fluorescent dye,
Coumarin 6 (0.6 parts by mass), Rhodamine 6G (0.3
Parts by mass) and Basic Violet 11 (0.3 parts by mass) were dissolved in 120 parts by mass of a propylene glycol monoethyl acetate (PEGMA) solvent. For the solution, a photopolymerizable resin "V259PA / P5"
(Product name, Nippon Steel Chemical Co., Ltd., refractive index 1.59)
100 parts by mass was added and dissolved. This coating liquid was applied onto a Corning glass (50 × 50 × 1.0 mm) on which a blue filter layer and a green conversion layer were formed by a spin coating method. Next, patterning was performed by a photolithography method to obtain a red conversion layer 2 having a pattern with a line width of 0.1 mm × 0.3 mm, a pitch of 0.33 mm, and a film thickness of 6 μm.

[Formation of Heat Dissipating Layer 6] For the Corning glass on which the red color conversion layer, the green color conversion layer and the blue color filter layer have been formed as described above, a mask capable of forming a grid pattern is used and RGB Around each subpixel,
A 6 μm-thick SiN film was formed by a sputtering method to form the heat dissipation layer 7. The sputtering device was an RF-planar magnetron device, and Si ₃ N ₄ was used as a target.
Further, Ar was used as a sputtering gas at the time of film formation, and the film formation was performed at a substrate temperature of 160 ° C. A top view of the structure obtained by this step is shown in FIG.

[Production of Gas Barrier Layer 7] A silicon-based hard coating agent (KP854, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied on the substrate on which the heat dissipation layer was formed as described above by a spin coating layer, and then in an oven. By baking at 130 ° C., a first gas barrier layer 7a having a thickness of 0.5 μm was obtained. Next, a sputtering method is used to form a 0.5 μm thick SiO film.
The second gas barrier layer 7b composed of the _x film was obtained. The sputtering device was an RF-planar magnetron device, and SiO ₂ was used as a target. Further, Ar was used as a sputtering gas at the time of film formation, and the film formation was performed at a substrate temperature of 80 ° C. The gas barrier layer 7 having a two-layer structure was obtained by the above method.

[Production of Organic EL Element] As shown in FIG. 3, an anode 8 / hole injection layer 9 / hole transport layer 10 / organic light emitting layer was formed on the color conversion filter substrate produced as described above. 11 / electron injection layer 12 / cathode 13 was formed into a 6-layer organic EL element (light emitter).

First, a transparent electrode (IT) is formed on the surface of the gas barrier layer 7 which is the uppermost layer of the filter substrate by a sputtering method.
O) was deposited on the entire surface. Next, the resist agent "O
FRP-800 "(trade name, manufactured by Tokyo Ohka) was applied.
Next, patterning was performed by a photolithography method to form an anode 8 having a stripe pattern having a width of 0.094 mm, a pitch of 0.33 mm and a film thickness of 100 nm, which were located in the light emitting portions of the respective colors.

Next, the substrate on which the anode 8 is formed is mounted in a resistance heating vapor deposition device, and the hole injection layer 9 and the hole transport layer 1 are attached.
0, the organic light emitting layer 11, and the electron injection layer 12 were sequentially formed without breaking the vacuum. When forming a film, the internal pressure of the vacuum chamber is 1 × 10
^The pressure was reduced to ^-4 Pa. As the hole injection layer 9, copper phthalocyanine (CuPc) having a thickness of 100 nm was laminated. As the hole transport layer 10, 4,4′-bis [N- (1-naphthyl)-
N-phenylamino] biphenyl (α-NPD) 20
nm stacked. As the organic light emitting layer 11, 4,4′-bis (2,2′-diphenylvinyl) biphenyl (DPVB
i) was laminated to 30 nm. Aluminum chelate (tris (8-hydroxyquinoline)) is used as the electron injection layer 12.
An aluminum complex, Alq) was laminated in a thickness of 20 nm. Table 1
Shows the structural formulas of the materials used for each layer.

[0059]

[Table 1]

Next, without breaking the vacuum, the anode (IT
O) Mg / Ag (mass ratio 10/1) layer having a thickness of 200 nm, using a mask capable of obtaining a stripe pattern having a width of 0.30 mm and a pitch of 0.33 mm (gap width of 0.03 mm) orthogonal to the line 8) A cathode 13 made of was formed.

The organic light-emitting device thus obtained was sealed glass (not shown) in a glove box under a dry nitrogen atmosphere (both oxygen and water concentrations were 10 ppm or less).
And a UV-curable adhesive were used for sealing to obtain a color conversion color display.

(Example 2) On the outer peripheral portion (inside the sealing glass) of the organic EL element in Example 1, JP-A-9-3586 was used.
A color conversion color display was obtained in the same manner as in Example 1 except that the inert oil (Demnum S-20, manufactured by Daikin Industries, Ltd.) disclosed in the Example of JP-A-8 was filled.

(Comparative Example 1) A color conversion color display was obtained in the same manner as in Example 1 except that the heat dissipation layer 6 was prepared using a negative photoresist (V259PA / P5, Nippon Steel Chemical Co., Ltd.). It was

(Comparative Example 2) On the outer peripheral portion (inside the sealing glass) of the organic EL element in Comparative Example 1, JP-A-9-3586 was used.
A color-converted color display was obtained in the same manner as in Comparative Example 1 except that the inert oil (Demnum S-20, manufactured by Daikin Industries, Ltd.) disclosed in the Example of JP-A-8 was filled.

(Evaluation) With respect to the color conversion color displays manufactured in the examples and the comparative examples, the luminance when continuously driven under the same conditions (the organic EL element is continuously lit under the condition of initially achieving 100 cd / m ² ). The change was measured.
Results are shown in FIG. As shown in FIG. 5, it can be seen that the color conversion displays of Examples 1 and 2 have a small amount of change in luminance with time and have a long life. Further, as is clear from the comparison between Example 1 and Example 2, as disclosed in JP-A-9-35.
Even better results were obtained by using the measures with the inert oil described in Japanese Patent No. 868 together. Only from the viewpoint of extending the life of the color conversion type display, it is preferable to use an inert oil together with the heat dissipation layer of the present invention. However, when using an inert oil,
There are problems in that the number of steps for injecting the inert oil is increased, and that the finished panel becomes a liquid-containing material instead of a completely solid-state device, so that the productivity and the impact resistance of the completely-solid-state element are lowered. Furthermore, in order to hold the inert oil, a sealing glass or a sealing can becomes indispensable, and sealing with a sealing film (for example, Japanese Patent Laid-Open No. 5-101886), which is being researched for the purpose of thinning, is required. It also has the drawback of not being applicable. Therefore, whether to use an inert oil together should be examined according to the application of the color conversion display.

[0066]

The fine particle additive according to the present invention is added to a color conversion filter to provide a color conversion filter substrate in which the deterioration of the function of the color conversion filter due to the driving of the organic EL light emitting device is suppressed, and long-term use. It is possible to provide a color conversion type organic EL color display that maintains stable light emission characteristics over the entire range. As a result, a color conversion type organic EL display having excellent reliability and wide viewing angle characteristics is realized.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a conventional color conversion filter substrate.

FIG. 2 is a schematic sectional view of a color conversion filter substrate of the present invention.

FIG. 3 is a schematic sectional view of a color conversion color display of the present invention.

FIG. 4 is a schematic top view of a color conversion filter substrate (four pixels, before forming a gas barrier layer) of the present invention.

FIG. 5 is a graph comparing changes in luminance with time of driving of the color conversion displays manufactured in Examples and Comparative Examples.

[Explanation of symbols]

1 transparent support substrate 2 Red conversion layer 3 Green conversion layer 4 Blue conversion layer 5 Overcoat layer 6 Heat dissipation layer 7a First gas barrier layer 7b Second gas barrier layer 8 anode 9 Hole injection layer 10 Hole transport layer 11 Organic light emitting layer 12 Electron injection layer 13 cathode

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H048 BA02 BB02 BB08 BB10 BB32                 3K007 AB04 AB11 AB12 AB13 AB14                       BB06 DB03

Claims (9)

[Claims] 1. A transparent support substrate, and a photopolymerizable resin film having a film thickness of 5 μm or more, which is disposed on the support substrate and contains at least one kind of fluorescent dye, formed in a desired pattern. One or a plurality of types of color conversion filter layers, a heat dissipation layer having excellent thermal conductivity, which is disposed between the color conversion filter layers, and a gas barrier layer which covers the color conversion filter layers and is formed to be transparent and flat. A color conversion filter substrate characterized by comprising at least. 2. The color conversion filter substrate according to claim 1, wherein the heat dissipation layer is made of a metal or an alloy. 3. The metal or alloy is Al, Si, T
The color conversion filter substrate according to claim 2, wherein the color conversion filter substrate is selected from the group consisting of i and alloys thereof. 4. The color conversion filter substrate according to claim 1, wherein the heat dissipation layer is formed of an oxide or a nitride. 5. The oxide or nitride is AlN, S
iN, TiN, Al _TwoO_Three, SiO_xAnd TiO_xOr
The method according to claim 4, characterized in that it is selected from the group consisting of:
Mounted color conversion filter substrate. 6. The color conversion filter substrate according to claim 1, wherein the heat dissipation layer is formed of a polymer material in which a good heat conductor is dispersed. 7. The color conversion filter substrate according to claim 1, wherein the heat dissipation layer is formed of an epoxy resin having a mesogenic structure. 8. The gas barrier layer includes a layer of an epoxy resin having a mesogenic structure.
8. The color conversion filter substrate according to any one of items 1 to 7. 9. A transparent electrode layer formed in one or a plurality of electrically independent regions on the color conversion filter substrate according to claim 1, a light emitting layer, and a second electrode. A color conversion color display, characterized in that it is formed by at least sequentially laminating layers.