JP2011089016A - Green colored composition, color filter and color display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a green colored composition capable of forming a color filter enabling high brightness and a broad region of color reproduction in a liquid crystal display device using a white organic EL light source, a color display device such as an organic EL display device, a color filter having a filter segment formed by using the green colored composition, a white organic EL light source equipped with this filter, and the color display device using this light emitting device. <P>SOLUTION: The green colored composition includes a colorant, a transparent resin, a monomer and/or a photopolymerization initiator and colorant includes a pigment (A) represented by formula (1) and a yellow pigment (B), and this green colored composition is used in the color filter of a display device equipped with a white organic EL light source. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a color display device having a color filter and a white organic EL (electroluminescence) element (hereinafter sometimes referred to as “OLED”) as a light source (white organic EL light source), and a color preferably used for the color display device. It is related with the green coloring composition used for formation of a filter and this color filter. White means a broad concept including pseudo white.

  As a color display device using a color filter, for example, (a) a backlight as a light source, a liquid crystal as an optical shutter, and a combination of color filters having color adjustment functions (color conversion function, color separation function, color correction function, etc.) (B) a synthetic white organic EL light source, an organic EL display device comprising a combination of color filters having color adjustment functions (color conversion function, color separation function, color correction function, etc.), and the like.

  As the backlight in the liquid crystal display device of (a), a cold-cathode tube type backlight, a two-wavelength peak pseudo-white backlight or a three-wavelength peak backlight using a light emitting diode or a white organic EL element using an inorganic material. There are lights. The backlights other than the OLED light source have a bright line spectrum designed from the aspects of display performance as a liquid crystal display device, matching with color filters, and durability of the backlight.

  In the liquid crystal display device, a liquid crystal layer sandwiched between two polarizing plates controls the amount of light passing through the first polarizing plate by controlling the degree of polarization of light passing through the first polarizing plate. The VA mode, the IPS mode, etc., and the type using a TN (twisted nematic) mode type liquid crystal is the mainstream. However, these liquid crystal display devices have a problem that energy is wasted because the backlight unit continues to emit the same light as white display even in black display.

  As the synthetic white organic EL light source of the organic EL display device of (b), there are a light source having a two-wavelength peak, a light source having a three-wavelength peak, and a light source having many peaks in the visible light region, and an organic EL that emits light in each color. Synthetic white light is obtained by mixing or layering materials.

  Since the organic EL display device can directly turn on / off the light source of the pixel by a TFT (thin film transistor) or the like, it is possible to perform black display by turning off the light emission of the designated pixel. Accordingly, the polarizing plate used in the liquid crystal display device is not required in the light emitting device, and it is not necessary to control the liquid crystal body. For this reason, the amount of transmitted light in the display device increases, and energy consumption can be greatly reduced by turning off the light emitting device in black display. In addition, it is possible to reproduce true dark black, and the contrast ratio can be increased. As an organic EL color display device in which the problems in the liquid crystal display device are solved, for example, a product such as “XEL-1” manufactured by SONY is already on the market. (For example, see Patent Document 1)

  Further, in a conventionally used display device such as a liquid crystal display device using a backlight such as a cold-cathode tube type, the green coloring composition used for forming the green filter segment generally has excellent brightness. . I. Pigment Green 36, C.I. I. Pigment Green 7 is often used. In a conventional color filter, high brightness and a wide color display area can be achieved by using these pigments.

  In recent years, a color display device using an OLED light source has attracted attention because of its excellent display performance. However, in both cases (a) and (b), it is used as a conventional backlight and a backlight or white light source. There is a difference in specific spectrum and structure from the OLED light source. (For example, see Non-Patent Documents 1 and 2)

  For example, in backlights such as cold cathode fluorescent lamps and inorganic LED light sources, emission line spectra are designed from the aspects of display performance as a liquid crystal display device, matching with color filters, and durability of the backlight. However, in the OLED light source, there is no peak around 420 to 430 nm due to the characteristics of the material, and there are peaks around 460 nm and 600 nm. Moreover, since the emission spectrum of the OLED light source has a broader peak as compared with the conventional light source, the spectrum is higher than that of the conventional light source up to around 500 nm even after passing the peak around 460 nm. ing. For these reasons, currently used color filters cannot be used as they are in display devices using OLED light sources. For this reason, it is necessary to select and develop a color filter material that can be used for an OLED light source and that has optimum hue and transmittance characteristics.

Japanese Patent Laid-Open No. 2005-10091 JP-A-2005-202196

T.A. K. Hatwar et al. , IMID '07 DIGEST 15-1 Osamu Akahoshi “Development of Organic Electronics” Information Organization 2007/09/27

  The present invention has been made in view of such a current situation, and in a color display device such as a liquid crystal display device or an organic EL display device using a white organic EL light source, a color filter capable of high brightness and a wide color reproduction region is provided. An object of the present invention is to provide a green coloring composition that can be formed, and a color filter including a filter segment formed using the same, and further provide a color display device having the color filter and a white organic EL element as a light source. It is what.

  As a result of intensive studies in order to solve the above problems, the present inventors have obtained a pigment (A) having a structure represented by the following formula (1), a yellow pigment (B), a transparent resin, It has been found that the above-mentioned problems can be solved by using a green coloring composition containing a monomer and / or a polymerization initiator.

Formula (1)

  The present invention also relates to a green coloring composition, wherein the weight ratio of the pigment (A) to the yellow pigment (B) is 75:25 to 20:80.

  In the present invention, the yellow pigment (B) is C.I. I. It is related with the green coloring composition characterized by including the at least 1 or more types of yellow pigment chosen from the group which consists of Pigment Yellow 138, 139, 150, and 185.

  In addition, the present invention relates to the green coloring composition, which is a green pigment dispersion obtained by dispersing a mixture containing at least the pigment (A), the yellow pigment (B), and a transparent resin.

  The present invention also provides a color filter comprising at least one red filter segment, at least one green filter segment, and at least one blue filter segment, wherein at least one green filter segment is the green coloring composition described above The color filter formed by these.

  The present invention also relates to the color filter described above, which is for a light emitting device having a white organic EL light source.

  In the present invention, at least one green filter segment has a spectral characteristic having two or more maximum values within a wavelength range of 400 nm to 700 nm, and is at least in a wavelength range of 430 nm to 485 nm and a wavelength range of 580 nm to 620 nm. It has peak wavelengths (λ1) and (λ2) at which the emission intensity becomes maximum, and the ratio (I2 / I1) of the emission intensity I1 at the wavelength λ1 to the emission intensity I2 at the wavelength λ2 is 0.4 or more and 0.9 or less. XYZ color system chromaticity coordinates measured using a white organic EL light source having a certain emission spectrum satisfy 0.180 ≦ x ≦ 0.225, 0.650 ≦ y ≦ 0.715, and the colored layer pattern The present invention relates to the color filter, wherein the film thickness is less than 3.5 μm.

  The present invention also relates to a color display device comprising the color filter and a light emitting device having a white organic EL light source.

  In the present invention, by using a green coloring composition containing a white organic EL light source and a pigment (A) having a structure represented by the formula (1) and a yellow pigment (B) as a colorant, high brightness, A color filter having a wide color display area, a high contrast ratio, and a color display device can be obtained.

It is an example of the emission spectrum of a white organic EL light source.

Hereinafter, the present invention will be described in detail.
In addition, “CI” mentioned below means a color index (CI).
<Green coloring composition>
The green coloring composition of the present invention is a green coloring composition containing a pigment (A) having a structure represented by the formula (1), a yellow pigment (B), a transparent resin, a monomer and / or a polymerization initiator. And a green coloring composition suitable for use in a color filter of a color display device or a liquid crystal display device mainly comprising a white organic EL light source, and particularly a color filter of a color display device comprising a white organic EL light source It is a green coloring composition used preferably. First, other components such as a colorant, a transparent resin, a monomer, a polymerization initiator, a solvent used as necessary, a dispersibility improver, and a dispersion aid used in the green coloring composition will be sequentially described.

[Colorant]
(Pigment (A) having structure represented by formula (1))
The colorant of the green coloring composition includes at least a pigment (A) having a structure represented by the following formula (1) and a yellow pigment (B). The pigment (A) can be produced by a known method described in a patent document (US Pat. No. 7,585,363). In the green coloring composition coating film containing the pigment (A), C.C. I. Compared with a green coloring composition coating film of a copper phthalocyanine pigment such as Pigment Green 7, the hiding power of light having a long wavelength of 670 nm or more is high. On the other hand, the transmittance | permeability of the green coloring composition coating film using the said pigment with respect to the 500 nm-550 nm light requested | required of a green filter segment is high enough. When the above colorant having a low wavelength hiding power is used, the thickness of the filter segment must be increased in order to reduce the long wavelength light transmittance in the green filter segment. The light transmittance of 500 nm to 550 nm is also reduced. Moreover, when the film thickness of the filter segment increases, there is a problem that the productivity of the filter segment also deteriorates. For the above reasons, when the green coloring composition of the present invention is used, C.I. I. It is excellent in forming a color filter pattern with a thinner film thickness than a green filter segment using Pigment Green 7 or the like.

(Formula 1)

In recent years, the color reproduction range has been determined by the standard three primary colors defined by the US National Television System Committee (NTSC), red (0.67, 0.33), green (0.21, 0.71), and blue (0.31). 14, 0.08), a color filter satisfying that the ratio (unit:%, hereinafter abbreviated as NTSC ratio) to the area surrounded by 90% or more is required. In particular, a color display device having a color filter satisfying the chromaticity of the NTSC standard is preferable because color reproducibility comparable to a printed matter can be obtained.
In the green filter segment of such a color filter, the chromaticity points (x, y) in the XYZ color system measured using a white organic EL light source are 0.180 ≦ x ≦ 0.225, 0.650 ≦ y. It is preferable to use a green coloring composition satisfying ≦ 0.715.
Further, it is more preferable to use a green coloring composition having chromaticity coordinates (x, y) close to (0.210, 0.710). When the chromaticities x and y are out of the above ranges, it is difficult to reproduce a green color with high saturation comparable to the printed matter. Moreover, when y is larger than 0.715, it is possible to reproduce high green again, but this is not preferable because the transmittance of the green filter segment is lowered. The film thickness of the filter segment is preferably less than 3.5 μm and more preferably 3.0 μm or less from the viewpoint of the productivity and transmittance of the filter segment.

(Pigment (B)
The green coloring composition of the present invention contains a yellow pigment (B) as a colorant in addition to the pigment (A) having the structure represented by the formula (1). Examples of the yellow pigment (B) include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 126, 127, 128, 129, 138, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180 181,182,185,187,188,193,194,198,199,213,214, and the like. Among these, the inclusion of any one of Pigment Yellow 138, 139, 150, and 185 is preferred because a green colored composition having a high transmittance can be obtained, and the inclusion of Pigment Yellow 185 is most preferred in terms of excellent transmittance. .

  When the colorant does not contain any of the pigment (A) having the structure represented by the formula (1) and the yellow pigment (B), an XYZ color measurement measured using a white organic EL light source having a colored layer pattern It becomes difficult for the chromaticity coordinates in the system to satisfy 0.180 ≦ x ≦ 0.225 and 0.650 ≦ y ≦ 0.715. The preferred weight ratio of the pigment (A) to the pigment (B) is 75:25 to 20:80, and 70:30 to 30:70 indicates that the chromaticity coordinates in the XYZ color system of the colored layer pattern are Since it becomes easy to satisfy | fill the said chromaticity range, it is preferable.

  In addition to the pigments (A) and (B), the green coloring composition of the present invention is not limited to C.I. I. Pigment Green 7, 10, 36, 37, 58 and other green pigments may be contained.

(Miniaturization of colorant)
The colorant contained in the green coloring composition of the present invention can be refined by performing a salt milling treatment. The primary particle diameter of the colorant is preferably 20 nm or more because of good dispersion in the colorant carrier. Moreover, since a filter segment with favorable surface roughness can be formed, it is preferable that it is 100 nm or less. A particularly preferable range is a range of 25 to 85 nm. The primary particle diameter of the pigment was measured by directly measuring the size of the primary particle from an electron micrograph of the pigment using a TEM (transmission electron microscope). Specifically, the minor axis diameter and major axis diameter of the primary particles of each pigment were measured, and the average was taken as the particle diameter of the pigment particles. Next, for 100 or more pigment particles, the volume of each particle is obtained by approximating it to a cube of the obtained particle size, and the volume average particle size is defined as the average primary particle size.

  Salt milling is a process of heating a mixture of a colorant, a water-soluble inorganic salt, and a water-soluble organic solvent using a kneader such as a kneader, two-roll mill, three-roll mill, ball mill, attritor, or sand mill. After mechanically kneading, the water-soluble inorganic salt and the water-soluble organic solvent are removed by washing with water. The water-soluble inorganic salt serves as a crushing aid, and the pigment is crushed using the high hardness of the inorganic salt during salt milling. By optimizing the conditions at the time of subjecting the pigment to salt milling, it is possible to obtain a colorant having a sharp particle size distribution with a very fine primary particle diameter and a wide distribution range.

  As the water-soluble inorganic salt, sodium chloride, barium chloride, potassium chloride, sodium sulfate and the like can be used, but sodium chloride (salt) is preferably used from the viewpoint of cost. The water-soluble inorganic salt is preferably used in an amount of 50 to 2000% by weight, and most preferably 300 to 1000% by weight based on the total weight of the pigment (100% by weight) from the viewpoint of both processing efficiency and production efficiency.

  The water-soluble organic solvent functions to wet the colorant and water-soluble inorganic salt, and is not particularly limited as long as it dissolves (mixes) in water and does not substantially dissolve the inorganic salt to be used. However, a high boiling point solvent having a boiling point of 120 ° C. or higher is preferable from the viewpoint of safety because the temperature rises during salt milling and the solvent is easily evaporated. For example, 2-methoxyethanol, 2-butoxyethanol, 2- (isopentyloxy) ethanol, 2- (hexyloxy) ethanol, diethylene glycol, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol monomethyl ether, Liquid polyethylene glycol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, dipropylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, liquid polypropylene glycol and the like are used. The water-soluble organic solvent is preferably used in an amount of 5 to 1000% by weight, and most preferably 50 to 500% by weight, based on the total weight of the colorant (100% by weight).

  When salt milling the colorant, a resin may be added as necessary. The type of resin used is not particularly limited, and natural resins, modified natural resins, synthetic resins, synthetic resins modified with natural resins, and the like can be used. The resin used is solid at room temperature, preferably insoluble in water, and more preferably partially soluble in the organic solvent. The amount of resin used is preferably in the range of 5 to 200% by weight based on the total weight of the colorant (100% by weight).

[Transparent resin]
The transparent resin used in the green coloring composition of the present invention is preferably a resin having a spectral transmittance of preferably 80% or more, more preferably 95% or more in the entire wavelength region of 400 to 700 nm in the visible light region. The transparent resin may be any of a thermoplastic resin, a thermosetting resin, and a photocurable resin, and can be used in an amount of 30 to 500% by weight based on the total weight of the pigment. If it is less than 30% by weight, the film formability and various resistances are insufficient, and if it exceeds 500% by weight, the pigment concentration is low and color characteristics cannot be expressed.

  Examples of the thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, and polyester resin. Acrylic resins, alkyd resins, polystyrene resins, polyamide resins, rubber resins, cyclized rubber resins, celluloses, polyethylene (HDPE, LDPE), polybutadiene, polyimide resins, and the like.

  Examples of the thermosetting resin include an epoxy resin, a benzoguanamine resin, a rosin-modified maleic acid resin, a rosin-modified fumaric acid resin, a melamine resin, a urea resin, and a phenol resin.

  As the photocurable resin, a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group has a reactive substituent such as an isocyanate group, an aldehyde group, an epoxy group, or a carboxyl group (meta ) A resin obtained by reacting an acrylic compound or cinnamic acid to introduce a photocrosslinkable group such as a (meth) acryloyl group or a styryl group into the linear polymer is used. Further, a linear polymer containing an acid anhydride such as a styrene-maleic anhydride copolymer or an α-olefin-maleic anhydride copolymer is converted into a (meth) acrylic compound having a hydroxyl group such as hydroxyalkyl (meth) acrylate. Half-esterified products are also used.

  When the green coloring composition is used in the form of an alkali development type colored resist material, it is preferable to use an alkali-soluble resin having an acidic group such as a (meth) acrylic acid copolymer resin (alkali-soluble acrylic resin). In order to disperse the pigment preferably, the weight average molecular weight (Mw) of the alkali-soluble resin is preferably in the range of 10,000 to 100,000, more preferably in the range of 30,000 to 80,000. The number average molecular weight (Mn) is preferably in the range of 5,000 to 50,000, and the value of Mw / Mn is preferably 10 or less.

  In the present invention, the weight average molecular weight (Mw) of the resin was measured using a TSKgel column (manufactured by Tosoh Corporation) and GPC equipped with an RI detector (manufactured by Tosoh Corporation, HLC-8120GPC) using THF as a developing solvent. It is a weight average molecular weight (Mw) in terms of polystyrene.

〔monomer〕
The monomer of the present invention includes a monomer or oligomer that is cured by ultraviolet rays or heat to produce a transparent resin, and these can be used alone or in combination of two or more. The amount of the monomer is preferably 5 to 400% by weight based on the total weight of the colorant (100% by weight), and more preferably 10 to 300% by weight from the viewpoint of photocurability and developability. preferable.

  Examples of monomers and oligomers that are cured by ultraviolet rays or heat to produce a transparent resin include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate. , Cyclohexyl (meth) acrylate, β-carboxyethyl (meth) acrylate, polyethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di ( (Meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, 1,6-hexanediol diglycy Ruether di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, neopentyl glycol diglycidyl ether di (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, tricyclodeca Nyl (meth) acrylate, ester acrylate, methylolated melamine (meth) acrylate ester, epoxy (meth) acrylate, urethane acrylate and other acrylic esters and methacrylate esters, (meth) acrylic acid, styrene, vinyl acetate, Hydroxyethyl vinyl ether, ethylene glycol divinyl ether, pentaerythritol trivinyl ether, (meth) acrylamide, N-hydroxymethyl Examples include, but are not necessarily limited to, til (meth) acrylamide, N-vinylformamide, acrylonitrile and the like.

(Polymerization initiator)
The polymerization initiator of the present invention includes a photopolymerization initiator and a thermal polymerization initiator.
(Photopolymerization initiator)
A photopolymerization initiator is added to the green coloring composition of the present invention as necessary in order to cure the composition by irradiation with ultraviolet rays and form a filter segment by a photolithographic method. A photopolymerization initiator is also used when a photocurable resin is used as the transparent resin. The blending amount when using the photopolymerization initiator is preferably 5 to 200% by weight based on the total weight of the colorant (100% by weight), and 10 to 150 from the viewpoint of photocurability and developability. More preferably, it is% by weight.

Examples of the photopolymerization initiator include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpho Acetophenone photopolymerization initiators such as linopropan-1-one, benzoin photopolymerization initiators such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzyldimethyl ketal, benzophenone, benzoylbenzoic acid, benzoylbenzoic acid Me , 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, benzophenone photopolymerization initiators such as 4-benzoyl-4′-methyldiphenyl sulfide, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthio Thioxanthone photopolymerization initiators such as xanthone and 2,4-diisopropylthioxanthone, 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piperonyl-4 , 6-Bis (trichloromethyl) -s-triazine, 2,4-bis Trichloromethyl) -6-styryl-s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxy-naphth-1-yl)- Triazines such as 4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, 2,4-trichloromethyl (4′-methoxystyryl) -6-triazine A photopolymerization initiator, a borate photopolymerization initiator, a carbazole photopolymerization initiator, an imidazole photopolymerization initiator, etc., and an oxime ester photopolymerization initiator are used.
The said photoinitiator can be used individually or in mixture of 2 or more types.

(Sensitizer)
Moreover, a sensitizer may be used with the said photoinitiator as needed. As the sensitizer, any conventionally known sensitizer for the polymerization initiator can be used. Specifically, α-acyloxy ester, acylphosphine oxide, methylphenylglyoxylate, benzyl, 9,10-phenanthrenequinone, camphorquinone, ethylanthraquinone, 4,4′-diethylisophthalophenone, Examples of the compound include 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone and 4,4′-diethylaminobenzophenone, but are not limited thereto. The blending amount when using the sensitizer is preferably 3 to 60% by weight based on the total weight (100% by weight) of the photopolymerization initiator contained in the green coloring composition, and is photocurable. From the viewpoint of developability, it is more preferably 5 to 50% by weight.

(Thermal polymerization initiator)
When a thermosetting resin is used as the transparent resin, a thermopolymerization initiator may be included as necessary. Examples of the thermal polymerization initiator include benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di (peroxide benzoate) hexyne-3, 1,4- Bis (tert-butylperoxyisopropyl) benzene, lauroyl peroxide, tert-butyl peracetate, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3, 2,5-dimethyl-2,5- Di (tert-butylperoxy) hexane, tert-butylperbenzoate, tert-butylperphenylacetate, tert-butylperisobutyrate, tert-butylper-sec-octoate, tert-butylperpivalate, cumylper Bareto and tert- butyl hydroperoxide diethyl acetate, other azo compounds such as azobisisobutyronitrile, dimethyl azoisobutyrate, and the like.

〔solvent〕
In order to sufficiently disperse the pigment in the pigment carrier, the green coloring composition of the present invention is coated on a substrate such as a glass substrate so that the dry film thickness is 0.2 to 5 μm to form a filter segment. In order to facilitate the formation of the coating film, a solvent is contained.

Examples of the solvent include 1,2,3-trichloropropane, 1,3-butanediol, 1,3-butylene glycol, 1,3-butylene glycol diacetate, 1,4-dioxane, 2-heptanone, and 2-methyl. -1,3-propanediol, 3,5,5-trimethyl-2-cyclohexen-1-one, 3,3,5-trimethylcyclohexanone, ethyl 3-ethoxypropionate, 3-methyl-1,3-butanediol 3-methoxy-3-methyl-1-butanol, 3-methoxy-3-methylbutyl acetate, 3-methoxybutanol, 3-methoxybutyl acetate, 4-heptanone, m-xylene, m-diethylbenzene, m-dichlorobenzene N, N-dimethylacetamide, N, N-dimethylformamide, n-butylal N-butylbenzene, n-propyl acetate, N-methylpyrrolidone, o-xylene, o-chlorotoluene, o-diethylbenzene, o-dichlorobenzene, p-chlorotoluene, p-diethylbenzene, sec-butylbenzene, tert-butylbenzene, γ-butyrolactone, isobutyl alcohol, isophorone, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monoethyl ether, ethylene glycol monoethyl ether acetate, ethylene glycol monotertiary butyl ether, Ethylene glycol monobutyl ether, ethylene glycol monobutyl ether acetate, ethylene glycol monopropyl ether Ether, ethylene glycol monohexyl ether, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, diisobutyl ketone, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol Monomethyl ether, cyclohexanol, cyclohexanol acetate, cyclohexanone, dipropylene glycol dimethyl ether, dipropylene glycol methyl ether acetate, dipropylene glycol monoethyl ether, dipropylene Recall monobutyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monomethyl ether, diacetone alcohol, triacetin, tripropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, propylene glycol diacetate, propylene glycol phenyl ether, propylene glycol monoethyl ether , Propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether, propylene glycol monopropyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether propionate, benzyl alcohol, methyl isobutyl Tons, methylcyclohexanol, acetate n- amyl acetate n- butyl, isoamyl acetate, isobutyl acetate, propyl acetate, but dibasic acid ester and the like, not necessarily limited thereto.
A solvent can be used individually by 1 type or in mixture of 2 or more types. Moreover, since the solvent can adjust the coloring composition to an appropriate viscosity and can form a filter segment having a desired uniform film thickness, it is 800 to 4000% by weight based on the total weight of the colorant (100% by weight). It is preferable to use it in an amount.

[Dye derivative]
In the green coloring composition of the present invention, a pigment derivative can be used for the purpose of improving the dispersibility of the colorant. A pigment derivative is a compound in which a substituent is introduced into an organic pigment. Such organic dyes also include light yellow aromatic polycyclic compounds such as naphthalene and anthraquinone which are not generally called dyes. Examples of the dye derivatives are described in JP-A-63-305173, JP-B-57-15620, JP-B-59-40172, JP-B-63-17102, JP-B-5-9469, and the like. These can be used alone or in combination of two or more. When using a pigment derivative, the blending amount is preferably 0.001 to 40% by weight based on the total weight of the colorant (100% by weight), more preferably 0.1 to 30% by weight from the viewpoint of dispersibility. %, From the viewpoint of heat resistance and light resistance, it is most preferably 0.5 to 25% by weight. When the blending amount of the pigment derivative is less than 0.001% by weight with respect to the total amount of the colorant, the dispersibility may be deteriorated, and when it exceeds 40% by weight, the heat resistance and light resistance may be deteriorated.

[Dispersion aid]
When dispersing the colorant in a colorant carrier such as a transparent resin and / or an organic solvent, a dispersion aid such as a resin-type dispersant or a surfactant can be appropriately used. Since the dispersion aid is excellent in dispersion of the colorant and has a great effect of preventing reaggregation of the colorant after dispersion, the green coloring composition obtained by dispersing the colorant in the colorant carrier using the dispersion aid. When is used, a color filter having a high spectral transmittance can be obtained.

  The resin-type dispersant has a colorant-affinity part having the property of adsorbing to the colorant and a part compatible with the colorant carrier, and adsorbs to the colorant to disperse the colorant to the colorant carrier. It works to stabilize. Specific examples of resin-type dispersants include polycarboxylic acid esters such as polyurethane and polyacrylate, unsaturated polyamides, polycarboxylic acids, polycarboxylic acid (partial) amine salts, polycarboxylic acid ammonium salts, and polycarboxylic acid alkylamine salts. , Polysiloxane, long-chain polyaminoamide phosphate, hydroxyl group-containing polycarboxylic acid ester, modified products thereof, amides formed by reaction of poly (lower alkyleneimine) and polyester having a free carboxyl group, and salts thereof Water-soluble such as oil-based dispersants such as (meth) acrylic acid-styrene copolymer, (meth) acrylic acid- (meth) acrylic acid ester copolymer, styrene-maleic acid copolymer, polyvinyl alcohol, polyvinylpyrrolidone Resin, water-soluble polymer, polyester, Polyacrylate, ethylene oxide / propylene oxide addition compound, phosphate ester-based and the like are used, it can be used alone or in admixture of two or more. The compounding amount of the resin-type dispersant is preferably 0.001 to 40% by weight based on the total weight of the colorant (100% by weight), more preferably 0.1 to 35% by weight from the viewpoint of dispersibility, and heat resistance. From the viewpoints of lightness and light resistance, it is most preferably 0.5 to 30% by weight.

  Surfactants include sodium lauryl sulfate, polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium stearate, sodium alkyl naphthalene sulfonate, sodium alkyl diphenyl ether disulfonate Anionic surfactants such as monoethanolamine lauryl sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, monoethanolamine stearate, monoethanolamine of styrene-acrylic acid copolymer, polyoxyethylene alkyl ether phosphate; Polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene Nonionic surfactants such as alkyl ether phosphates, polyoxyethylene sorbitan monostearate, and polyethylene glycol monolaurate; chaotic surfactants such as alkyl quaternary ammonium salts and their ethylene oxide adducts; alkyldimethylamino Examples include amphoteric surfactants such as alkylbetaines such as betaine acetate and alkylimidazolines, and these can be used alone or in admixture of two or more.

(Leveling agent)
In order to improve the leveling property of the composition on the transparent substrate, it is preferable to add a leveling agent to the green coloring composition of the present invention. As the leveling agent, dimethylsiloxane having a polyether structure or a polyester structure in the main chain is preferable. Specific examples of dimethylsiloxane having a polyether structure in the main chain include FZ-2122 manufactured by Toray Dow Corning, BYK-333 manufactured by BYK Chemie. Specific examples of dimethylsiloxane having a polyester structure in the main chain include BYK-310 and BYK-370 manufactured by BYK Chemie. Dimethylsiloxane having a polyether structure in the main chain and dimethylsiloxane having a polyester structure in the main chain can be used in combination. In general, the leveling agent content is preferably 0.003 to 0.5% by weight based on the total weight of the green coloring composition (100% by weight).

  As a particularly preferred leveling agent, it is a kind of so-called surfactant having a hydrophobic group and a hydrophilic group in the molecule, has a hydrophilic group but has low solubility in water, and when added to a green coloring composition, It has the feature that its surface tension lowering ability is low, and it is useful to have good wettability to the glass plate despite its low surface tension lowering ability, and the added amount that does not cause coating film defects due to foaming In this case, those that can sufficiently suppress the chargeability can be preferably used. As a leveling agent having such preferable characteristics, dimethylpolysiloxane having a polyalkylene oxide unit can be preferably used. Examples of the polyalkylene oxide unit include a polyethylene oxide unit and a polypropylene oxide unit, and dimethylpolysiloxane may have both a polyethylene oxide unit and a polypropylene oxide unit.

  In addition, the bonding form of the polyalkylene oxide unit with dimethylpolysiloxane includes a pendant type in which the polyalkylene oxide unit is bonded in the repeating unit of dimethylpolysiloxane, a terminal-modified type in which the end of dimethylpolysiloxane is bonded, and dimethylpolysiloxane. Any of linear block copolymer types in which they are alternately and repeatedly bonded may be used. Dimethylpolysiloxane having a polyalkylene oxide unit is commercially available from Toray Dow Corning Co., Ltd., for example, FZ-2110, FZ-2122, FZ-2130, FZ-2166, FZ-2191, FZ-2203, FZ. -2207, but is not limited thereto.

An anionic, cationic, nonionic or amphoteric surfactant can be supplementarily added to the leveling agent. Two or more kinds of surfactants may be mixed and used.
Anionic surfactants added to the leveling agent as auxiliary agents include polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium alkyl naphthalene sulfonate, alkyl diphenyl ether disulfonic acid Sodium, lauryl sulfate monoethanolamine, lauryl sulfate triethanolamine, ammonium lauryl sulfate, monoethanolamine stearate, sodium stearate, sodium lauryl sulfate, monoethanolamine of styrene-acrylic acid copolymer, polyoxyethylene alkyl ether phosphate Examples include esters.

  Examples of the chaotic surfactant that is supplementarily added to the leveling agent include alkyl quaternary ammonium salts and their ethylene oxide adducts. Nonionic surfactants added to the leveling agent as auxiliary agents include polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene alkyl ether phosphate ester, polyoxyethylene sorbitan monostearate And amphoteric surfactants such as alkyl dimethylamino acetic acid betaine and alkylimidazolines, and fluorine-based and silicone-based surfactants.

[Curing agent, curing accelerator]
Moreover, in order to assist hardening of a thermosetting resin, a hardening | curing agent, a hardening accelerator, etc. may be included as needed. As the curing agent, phenolic resins, amine compounds, acid anhydrides, active esters, carboxylic acid compounds, sulfonic acid compounds and the like are effective, but are not particularly limited to these, and thermosetting resins. Any curing agent may be used as long as it can react with the. Of these, compounds having two or more phenolic hydroxyl groups in one molecule and amine curing agents are preferred. Examples of the curing accelerator include amine compounds (for example, dicyandiamide, benzyldimethylamine, 4- (dimethylamino) -N, N-dimethylbenzylamine, 4-methoxy-N, N-dimethylbenzylamine, 4-methyl). -N, N-dimethylbenzylamine etc.), quaternary ammonium salt compounds (eg triethylbenzylammonium chloride etc.), blocked isocyanate compounds (eg dimethylamine etc.), imidazole derivative bicyclic amidine compounds and salts thereof (eg Imidazole, 2-methylimidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 4-phenylimidazole, 1-cyanoethyl-2-phenylimidazole, 1- (2-cyanoethyl) -2- D Ru-4-methylimidazole, etc.), phosphorus compounds (eg, triphenylphosphine, etc.), guanamine compounds (eg, melamine, guanamine, acetoguanamine, benzoguanamine, etc.), S-triazine derivatives (eg, 2,4-diamino-6) -Methacryloyloxyethyl-S-triazine, 2-vinyl-2,4-diamino-S-triazine, 2-vinyl-4,6-diamino-S-triazine isocyanuric acid adduct, 2,4-diamino-6 Methacryloyloxyethyl-S-triazine / isocyanuric acid adduct, etc.) can be used. These may be used alone or in combination of two or more. The content of the curing accelerator is preferably 0.01 to 15% by weight based on the total weight of the thermosetting resin (100% by weight).

[Other additive components]
The green coloring composition of the present invention can contain a storage stabilizer in order to stabilize the viscosity with time of the composition. Moreover, in order to improve adhesiveness with a transparent substrate, adhesion improving agents, such as a silane coupling agent, can also be contained.

  Examples of storage stabilizers include quaternary ammonium chlorides such as benzyltrimethyl chloride and diethylhydroxyamine, organic acids such as lactic acid and oxalic acid, and methyl ethers thereof, t-butylpyrocatechol, tetraethylphosphine, and tetraphenylphosphine. Organic phosphines, phosphites and the like can be mentioned. The storage stabilizer can be used in an amount of 0.1 to 10% by weight based on the total weight of the colorant (100% by weight).

  Examples of the silane coupling agent include vinyl silanes such as vinyltris (β-methoxyethoxy) silane, vinylethoxysilane, and vinyltrimethoxysilane, (meth) acrylsilanes such as γ-methacryloxypropyltrimethoxysilane, β- (3 , 4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) methyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane, β- (3,4-epoxycyclohexyl) ) Epoxysilanes such as methyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β ( Aminoethyl) γ-aminopro Lutriethoxysilane, N-β (aminoethyl) γ-aminopropylmethyldiethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N Examples include aminosilanes such as -phenyl-γ-aminopropyltriethoxysilane, thiosilanes such as γ-mercaptopropyltrimethoxysilane, and γ-mercaptopropyltriethoxysilane. The silane coupling agent can be used in an amount of 0.01 to 10% by weight, preferably 0.05 to 5% by weight, based on the total weight (100% by weight) of the colorant in the green coloring composition. .

[Production method of green coloring composition]
The green coloring composition of the present invention is a three-roll mill, a two-roll mill, a sand mill, a kneader, a mixture of a colorant, a transparent resin, if necessary, a pigment derivative, a dispersion aid, and a solvent. A colorant can be finely dispersed in a resin solvent liquid using various dispersing means such as an attritor (pigment dispersion). The green coloring composition can be prepared as a green coloring composition (colored resist material) for a solvent developing type or alkali developing type color filter. The green color composition for solvent development type or alkali development type color filters is prepared by mixing the pigment dispersion with a monomer, a polymerization initiator, and if necessary, other resins, solvents, dye derivatives, dispersion aids and additives. Can be adjusted.
The green coloring composition can also be produced by mixing each pigment separately and finely dispersed in a resin and a solvent. In particular, the pigment (A) and the yellow pigment (B) are mixed. Dispersing together makes it possible to produce a dispersion excellent in fluidity. Therefore, when a colored composition is applied by a spin coating method, a colored composition with little coating unevenness can be obtained, which is preferable.

[Removal of coarse particles]
The green coloring composition of the present invention is prepared by means of centrifugal separation, sintering filter, membrane filter, etc., and coarse particles of 5 μm or more, preferably 1 μm or more, more preferably 0.5 μm or more and coarse particles It is preferable to remove the dust. Thus, it is preferable that a green coloring composition does not contain a particle | grain of 0.5 micrometer or more substantially. More preferably, it is 0.3 μm or less. In addition, the particle diameter here means the particle diameter measured by SEM.

<Color filter>
The color filter of the present invention is a color filter comprising at least one green filter segment, at least one red filter segment, and at least one blue filter segment, wherein at least one green filter segment is represented by the formula (1). It is formed by the green coloring composition containing the pigment (A) which has a structure represented, and a yellow pigment (B).

[Green filter segment]
As described above, the green filter segment of the color filter of the present invention is formed of a green coloring composition containing the pigment (A) and the yellow pigment (B). Such a green filter segment can be formed using the above-described green coloring composition of the present invention. As a forming method, any one of known or well-known methods for forming a conventional color filter segment, such as a printing method, an ink jet method, or a photolithography method, may be employed depending on the composition of the green coloring composition. .

[Red filter segment]
The red filter segment of the color filter of the present invention contains a red pigment as a colorant. Examples of red pigments include C.I. I. Pigment Red 7, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 57: 1, 81, 81: 1, 81: 2, 81: 3, 81: 4, 122, 123, Red pigments such as 146, 168, 177, 178, 179, 184, 185, 187, 190, 200, 202, 208, 210, 246, 254, 255, 264, 270, 272, 279.

  Moreover, a yellow pigment may be used in combination with the red filter segment as a colorant. Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 126, 127, 128, 129, 138, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180 181,182,185,187,188,193,194,198,199,213,214, and the like.

  In the present invention, in order to realize high brightness and a wide color display area in consideration of optimization of the red filter segment with the white organic EL light source, at least C.I. I. Pigment Red, 177, C.I. I. Pigment Red 149, C.I. I. It is preferable that at least one red pigment selected from the group consisting of Pigment Red 179 is included. The reason why the combination of these pigments is preferable in the red filter segment is that the high coloring power of each pigment is effective in developing a wide color display region.

  In order to form the red filter segment of the color filter of the present invention, a red pigment and a yellow pigment as described above are used, for example, a transparent resin component, a solvent, and, if necessary, a monomer, a polymerization initiator, and other green coloring compositions. Using the same material as that used for forming, a red colored composition is produced by the same method as the production of the green colored composition, and this red colored composition is used by the same method as the formation of the green filter segment. A red filter segment may be formed.

[Blue filter segment]
In the blue filter segment of the color filter of the present invention, for example, C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64, and the like can be used, and C.I. I. Pigment Violet 23 and other purple pigments, C.I. I. Pigment Red 81, 81: 1, 81: 2, 81: 3, 81: 4, 81: 5 and other metal lake pigments of rhodamine dyes can be used in combination.

  In order to form the blue filter segment of the color filter of the present invention, the blue pigment as described above and, if necessary, a violet pigment or a red pigment, for example, a transparent resin component, a solvent, and further, if necessary, a monomer or a polymerization initiator, Using the same material as that used to form the other green colored composition, a blue colored composition is produced by the same method as the production of the green colored composition, and a green filter is produced using the blue colored composition. The blue filter segment may be formed by the same method as the formation of the segment.

[Manufacture of color filters]
Below, the manufacturing method of the color filter using the green coloring composition of this invention is demonstrated.
The color filter of the present invention includes a filter segment on a substrate, and can include, for example, a black matrix and red, green, and blue filter segments. The said filter segment can be formed on a board | substrate by apply | coating the green coloring composition of this invention by a spin coat system or a die coat system, for example. At this time, each segment can be formed using a green coloring composition containing a monomer, a photopolymerization initiator, and the like, using a photolithography technique. Each segment can also be formed by a printing method. As a printing method at this time, a conventional well-known printing method or an inkjet method can be used.

  As a substrate of the color filter, a substrate having a high transmittance for visible light, for example, a glass plate such as soda lime glass, low alkali borosilicate glass, non-alkali aluminoborosilicate glass, polycarbonate, polymethyl methacrylate, polyethylene A resin plate such as terephthalate is used. In addition, a transparent electrode made of indium oxide, tin oxide, or the like may be formed on the surface of the glass plate or the resin plate in order to drive the liquid crystal after forming the panel.

  When forming a filter segment, when using a green color composition (colored resist material) for a solvent development type or alkali development type color filter containing a monomer, a photopolymerization initiator, etc., the green color composition film is exposed after exposure. Developed. As the developer, a known alkali developer conventionally used for developing a photosensitive resin, for example, an aqueous solution of sodium carbonate, sodium hydroxide or the like, or an organic alkali such as dimethylbenzylamine, triethanolamine or the like is used. Can do. Moreover, an antifoamer and surfactant can also be added to a developing solution. As a development processing method, a shower development method, a spray development method, a dip (immersion) development method, a paddle (liquid accumulation) development method, or the like can be applied.

  In order to increase the UV exposure sensitivity, the green coloring composition is applied and dried, and then a water-soluble or alkali-soluble resin such as polyvinyl alcohol or a water-soluble acrylic resin is applied and dried to form a film that prevents polymerization inhibition by oxygen. Ultraviolet exposure can also be performed after forming.

If the black matrix is formed in advance before forming the filter segment on the transparent substrate or the reflective substrate, the contrast of the display panel can be further increased. As the black matrix, a chromium, chromium / chromium oxide multilayer film, an inorganic film such as titanium nitride, or a resin film in which a light-shielding agent is dispersed is used, but is not limited thereto. In addition, a thin film transistor (TFT) may be formed in advance on the transparent substrate or the reflective substrate, and then a filter segment may be formed. By forming the filter segment on the TFT substrate, the aperture ratio of the panel can be increased and the luminance can be improved.
On the color filter of the present invention, an overcoat film or a transparent conductive film is formed as necessary.

<Color display device>
The color display device according to the present invention includes a color filter including a green filter segment formed of a green coloring composition containing at least a pigment (A) and a yellow pigment (B) as a colorant, and a white organic EL light source. To do.

[Organic EL device]
The organic EL element used in the present invention has a spectral characteristic having two or more maximum values within a wavelength range of 400 nm to 700 nm, and emits light at least in a wavelength range of 430 nm to 485 nm and a wavelength range of 580 nm to 620 nm. It has peak wavelengths (λ1) and (λ2) at which the intensity is maximum, and the ratio (I2 / I1) of the emission intensity I1 at the wavelength λ1 to the emission intensity I2 at the wavelength λ2 is 0.4 or more and 0.9 or less. It preferably has an emission spectrum, and more preferably 0.6 or more and 0.9 or less.
Furthermore, it is preferable that the light emission intensity has a maximum value or a shoulder in the wavelength range of 530 nm to 650 nm.
The wavelength range of 430 nm to 485 nm is preferable when the organic EL display device including the color filter displays blue with good color reproducibility. More preferably, it is the range of 430 nm-475 nm.

  An organic EL element is comprised from the element which formed the organic layer of one layer or a multilayer between the anode and the cathode. Here, the single-layer organic EL element refers to an element composed of only a light emitting layer between an anode and a cathode, while the multilayer organic EL element refers to a hole or a hole in the light emitting layer in addition to the light emitting layer. Hole injection layer, hole transport layer, hole blocking layer, electron injection for the purpose of facilitating electron injection and smooth recombination of holes and electrons in the light emitting layer It refers to a laminate of layers. Therefore, typical element configurations of the multilayer organic EL element include (1) anode / hole injection layer / light emitting layer / cathode, and (2) anode / hole injection layer / hole transport layer / light emitting layer / cathode. (3) Anode / hole injection layer / light emitting layer / electron injection layer / cathode, (4) Anode / hole injection layer / hole transport layer / light emitting layer / electron injection layer / cathode, (5) Anode / positive Hole injection layer / light emitting layer / hole blocking layer / electron injection layer / cathode, (6) anode / hole injection layer / hole transport layer / light emitting layer / hole blocking layer / electron injection layer / cathode, (7) Examples include an anode / light emitting layer / hole blocking layer / electron injection layer / cathode, and (8) an element configuration laminated in a multilayer structure such as anode / light emitting layer / electron injection layer / cathode. However, the organic EL element used in the present invention is not limited to these.

  Moreover, each organic layer mentioned above may be formed by the layer structure of 2 or more layers, respectively, and several layers may be laminated | stacked repeatedly. As such an example, an element configuration called “multi-photon emission” in which a part of the multilayer organic EL element is multilayered has been proposed in recent years for the purpose of improving light extraction efficiency. For example, in an organic EL device composed of a glass substrate / anode / hole transport layer / electron transporting light emitting layer / electron injection layer / charge generating layer / light emitting unit / cathode, the charge generating layer and the light emitting unit There is a method of laminating a plurality of portions.

  First, materials that can be used for each of these layers are specifically exemplified. However, materials that can be used in the present invention are not limited to these.

As a material that can be used for the hole injection layer, a phthalocyanine-based compound is effective, and copper phthalocyanine (abbreviation: CuPc), vanadyl phthalocyanine (abbreviation: VOPc), or the like can be used. There are also materials obtained by chemically doping conductive polymer compounds, such as polyethylenedioxythiophene (abbreviation: PEDOT) doped with polystyrene sulfonic acid (abbreviation: PSS), polyaniline (abbreviation: PANI), or the like. You can also Further, thin films of inorganic semiconductors such as molybdenum oxide (abbreviation: MoO _x ), vanadium oxide (abbreviation: VO _x ), nickel oxide (abbreviation: NiO _x ), and inorganic insulation such as aluminum oxide (abbreviation: Al ₂ O ₃ ) An ultra-thin body film is also effective. In addition, 4,4 ′, 4 ″ -tris (N, N-diphenyl-amino) -triphenylamine (abbreviation: TDATA), 4,4 ′, 4 ″ -tris [N- (3-methylphenyl) -N-phenyl-amino] -triphenylamine (abbreviation: MTDATA), N, N'-bis (3-methylphenyl) -N, N'-diphenyl-1,1'-biphenyl-4,4'-diamine (Abbreviation: TPD), 4,4′-bis [N- (1-naphthyl) -N-phenyl-amino] -biphenyl (abbreviation: α-NTPD), 4,4′-bis [N- (4- ( Aromatic amine compounds such as N, N-di-m-tolyl) amino) phenyl-N-phenylamino] biphenyl (abbreviation: DNTPD) can also be used. Further, a substance showing acceptability with respect to these aromatic amine compounds may be added to the aromatic amine compound, specifically, 2,3,5,6-tetrafluoro-7 which is an acceptor for VOPc. , 7,8,8-tetracyanoquinodimethane (abbreviation: F4-TCNQ), or α-NPD to which acceptor MoO _x is added may be used.

  As a material that can be used for the hole transport layer, an aromatic amine compound is preferable, and TDATA, MTDATA, TPD, α-NPD, DNTPD, and the like described for the hole injection material can be used.

As an electron transport material that can be used for the electron transport layer, tris (8-quinolinolato) aluminum (abbreviation: Alq ₃ ), tris (4-methyl-8-quinolinolato) aluminum (abbreviation: Almq ₃ ), bis (10− Hydroxybenzo [h] -quinolinato) beryllium (abbreviation: BeBq ₂ ), bis (2-methyl-8-quinolinolato) (4-phenylphenolato) aluminum (abbreviation: BAlq), bis [2- (2-hydroxyphenyl) And metal complexes such as benzoxazolate] zinc (abbreviation: Zn (BOX) ₂ ), bis [2- (2-hydroxyphenyl) benzothiazolate] zinc (abbreviation: Zn (BTZ) ₂ ). In addition to metal complexes, 2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3,4-oxadiazole (abbreviation: PBD), 1,3-bis [5- Oxadiazole derivatives such as (p-tert-butylphenyl) -1,3,4-oxadiazol-2-yl] benzene (abbreviation: OXD-7), 3- (4-tert-butylphenyl) -4 -Phenyl-5- (4-biphenylyl) -1,2,4-triazole (abbreviation: TAZ), 3- (4-tert-butylphenyl) -4- (4-ethylphenyl) -5- (4-biphenylyl) ) -1,2,4-triazole (abbreviation: p-EtTA Z) and other triazole derivatives, 2,2 ′, 2 ″-(1,3,5-benzenetriyl) tris [1-phenyl-1H-benz Imidazole] (abbreviation: Imidazole derivatives such as PBI), bathophenanthroline (abbreviation: can be used phenanthroline derivatives such as BCP): BPhen), bathocuproine (abbreviation.

Materials that can be used for the electron injection layer include Alq ₃ , Almq ₃ , BeBq ₂ , BAlq, Zn (BOX) ₂ , Zn (BTZ) ₂ , PBD, OXD-7, TA described above.
Electron transport materials such as Z, p-EtTAZ, TPBI, BPhen, and BCP can be used. In addition, an ultra-thin film of an insulator such as an alkali metal halide such as LiF or CsF, an alkaline earth halide such as CaF ₂ , or an alkali metal oxide such as Li ₂ O is often used. In addition, alkali metal complexes such as lithium acetylacetonate (abbreviation: Li (acac)) and 8-quinolinolato-lithium (abbreviation: Liq) are also effective. Further, a substance exhibiting a donor property with respect to these electron injection materials may be added to the electron injection material, and alkali metals, alkaline earth metals, rare earth metals, and the like can be used as donors. Specifically, a material obtained by adding lithium as a donor to BCP or a material obtained by adding lithium as a donor to Alq ₃ can be used.

  Furthermore, a hole blocking material that can prevent holes from passing through the light emitting layer from reaching the electron injection layer and form a layer having excellent thin film formability is used for the hole blocking layer. Examples of such hole blocking materials include aluminum complex compounds such as bis (8-hydroxyquinolinato) (4-phenylphenolato) aluminum, and bis (2-methyl-8-hydroxyquinolina). -To) (4-phenylphenolato) gallium complex compounds such as gallium, nitrogen-containing condensed aromatic compounds such as 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (abbreviation: BCP) Can be mentioned.

  Although there is no restriction | limiting in particular as a light emitting layer which obtains white light emission, For example, the following can be used. That is, the energy level of each layer of the organic EL laminated structure is defined and light is emitted using tunnel injection (European Patent No. 0390551). Similarly, a white light-emitting element is an example of an element using tunnel injection. What is described (JP-A-3-230584), a light-emitting layer having a two-layer structure (JP-A-2-220390 and JP-A-2-216790), and a plurality of light-emitting layers A layered material composed of materials having different emission wavelengths (Japanese Patent Laid-Open No. 4-51491), a blue light emitter (fluorescent peak 380 to 480 nm) and a green light emitter (480 to 580 nm), Further, a red phosphor is included (Japanese Patent Laid-Open No. 6-207170), the blue light emitting layer contains a blue fluorescent dye, and the green light emitting layer is a red fluorescent dye. It has contained area, such as construction of those (JP-A-7-142169) and the like further containing a green phosphor.

  Further, as the light emitting material used in the present invention, a material known as a conventional light emitting material may be used. Examples of compounds suitably used for blue, green, orange to red light emission are shown below. However, the light emitting material is not limited to those specifically exemplified below.

  Blue light emission can be obtained by using perylene, 2,5,8,11-tetra-t-butylperylene (abbreviation: TBP), 9,10-diphenylanthracene derivative, or the like as a guest material, for example. Further, styrylarylene derivatives such as 4,4′-bis (2,2-diphenylvinyl) biphenyl (abbreviation: DPVBi), 9,10-di-2-naphthylanthracene (abbreviation: DNA), 9,10-bis It can also be obtained from an anthracene derivative such as (2-naphthyl) -2-tert-butylanthracene (abbreviation: t-BuDNA). A polymer such as poly (9,9-dioctylfluorene) may also be used.

  Further preferred specific examples are shown in Table 1.

Green light is emitted from coumarin dyes such as coumarin 30 and coumarin 6, bis [2- (2,4-difluorophenyl) pyridinato] picolinatoiridium (abbreviation: FIrpic), bis (2-phenylpyridinato) acetyl. It can be obtained by using acetonatoiridium (abbreviation: Ir (ppy) (acac)) or the like as a guest material. Tris (8-hydroxyquinoline) aluminum (abbreviation: Alq ₃ ), BAlq, Zn (BTZ), bis (
It can also be obtained from a metal complex such as 2-methyl-8-quinolinolato) chlorogallium (substantially: Ga (mq) ₂ Cl). A polymer such as poly (p-phenylene vinylene) may also be used.

Further preferred specific examples are shown in Table 2.

Light emission from orange to red is caused by rubrene, 4- (dicyanomethylene) -2- [p- (dimethylamino) styryl] -6-methyl-4H-pyran (abbreviation: DCM1), 4- (dicyanomethylene) -2- Methyl-6- (9-julolidyl) ethynyl-4H-pyran (abbreviation: DCM2), 4- (dicyanomethylene) -2,6-bis [p- (dimethylamino) styryl] -4H-pyran (abbreviation: BisDCM) Bis [2- (2-thienyl) pyridinato] acetylacetonatoiridium (abbreviation: Ir (thp) ₂ (acac)), bis (2-phenylquinolinato) acetylacetonatoiridium (abbreviation: Ir (pq) (acac) )) Etc. as a guest material. It can also be obtained from a metal complex such as bis (8-quinolinolato) zinc (abbreviation: Znq2) or bis [2-cinnamoyl-8-quinolinolato] zinc (abbreviation: Znsq2). A polymer such as poly (2,5-dialkoxy-1,4-phenylenevinylene) may be used.

  Further preferred specific examples are shown in Table 3.

Furthermore, the material used for the anode of the organic EL device of the present invention is preferably a material having a work function (4 eV or more) metal, alloy, electrically conductive compound or a mixture thereof as an electrode substance. Specific examples of such an electrode substance include metals such as Au, and conductive materials such as CuI, ITO, SNO ₂ , and ZNO. In order to form this anode, a thin film can be formed from these electrode materials by a method such as vapor deposition or sputtering. The anode desirably has such a characteristic that when light emitted from the light emitting layer is extracted from the anode, the transmittance of the anode for light emission is greater than 10%. The sheet resistance of the anode is preferably several hundred Ω / cm ² or less. Further, although the film thickness of the anode depends on the material, it is usually selected in the range of 10 nm to 1 μm, preferably 10 to 200 nm.

The material used for the cathode of the organic EL device used in the present invention is a material having a work function (4 eV or less) metal, alloy, electrically conductive compound and a mixture thereof as an electrode substance. Specific examples of such electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium / silver alloy, aluminum / aluminum oxide, aluminum / lithium alloy, indium, and rare earth metals. This cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering. Here, when light emitted from the light-emitting layer is extracted from the cathode, the transmittance of the cathode for light emission is preferably greater than 10%. Further, the sheet resistance as the cathode is preferably several hundred Ω / cm ² or less, and the film thickness is usually 10 nm to 1 μm, preferably 50 to 200 Nm.

  Regarding the method for producing the organic EL device used in the present invention, an anode, a light emitting layer, a hole injection layer as necessary, and an electron injection layer as necessary are formed by the above materials and methods, and finally a cathode is formed. What is necessary is just to form. Moreover, an organic EL element can also be produced from the cathode to the anode in the reverse order.

  This organic EL element is manufactured on a translucent substrate. This translucent substrate is a substrate that supports the organic EL element, and for the translucency, it is desirable that the transmittance of light in the visible region of 400 to 700 nm is 50% or more, preferably 90% or more, Further, it is preferable to use a smooth substrate.

  These substrates have mechanical and thermal strengths and are not particularly limited as long as they are transparent. For example, glass plates, synthetic resin plates and the like are preferably used. Examples of the glass plate include plates made of soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, quartz, and the like. Examples of the synthetic resin plate include plates such as polycarbonate resin, acrylic resin, polyethylene terephthalate resin, polyether sulfide resin, and polysulfone resin.

  As a method for forming each layer of the organic EL element used in the present invention, a dry film forming method such as vacuum deposition, electron beam beam irradiation, sputtering, plasma, ion plating, or spin coating, dipping, flow coating, inkjet A wet film-forming method such as a method, a method of vapor-depositing a light emitter on a donor film, JP-A-2002-534882, and S. T.A. Lee, et al. , Proceedings of SID'02, p. LITI (Laser Induced Thermal Imaging) method described in 784 (2002), printing (offset printing, flexographic printing, gravure printing, screen printing), inkjet, and the like can also be applied.

  The organic layer is particularly preferably a molecular deposited film. Here, the molecular deposited film is a thin film formed by deposition from a material compound in a gas phase state or a film formed by solidifying from a material compound in a solution state or a liquid phase state. Can be classified from a thin film (accumulated film) formed by the LB method according to a difference in an agglomerated structure and a higher-order structure and a functional difference resulting therefrom. Also, as disclosed in JP-A-57-51781, a binder such as a resin and a material compound are dissolved in a solvent to form a solution, and then this is thinned by a spin coat method or the like. Also, an organic layer can be formed. The film thickness of each layer is not particularly limited, but if the film thickness is too thick, a large applied voltage is required to obtain a constant light output, resulting in poor efficiency. Conversely, if the film thickness is too thin, the pinhole is used. Or the like, and even when an electric field is applied, it is difficult to obtain sufficient light emission luminance. Accordingly, the thickness of each layer is suitably in the range of 1 nm to 1 μm, but more preferably in the range of 10 nm to 0.2 μm.

  Further, in order to improve the stability of the organic EL element with respect to temperature, humidity, atmosphere and the like, a protective layer may be provided on the surface of the element, or the entire element may be covered or sealed with a resin or the like. In particular, when the entire element is covered or sealed, a photocurable resin that is cured by light is preferably used.

  The current applied to the organic EL element used in the present invention is usually a direct current, but a pulse current or an alternating current may be used. The current value and the voltage value are not particularly limited as long as they are within the range that does not destroy the element. However, considering the power consumption and life of the element, it is desirable to efficiently emit light with as little electrical energy as possible.

  The driving method of the organic EL element used in the present invention can be driven not only by the passive matrix method but also by the active matrix method. Further, the method for extracting light from the organic EL device of the present invention is applicable not only to the method of bottom emission for extracting light from the anode side but also to the method of top emission for extracting light from the cathode side. These methods and techniques are described in Shinji Kido, “All about organic EL”, published by Nihon Jitsugyo Shuppansha (published in 2003).

  The main method of the full color method of the organic EL element used in the present invention is a color filter method. The color filter method uses a white light emitting organic EL element to extract light of three primary colors through a color filter. In addition to these three primary colors, a part of white light is extracted as it is and used for light emission. In addition, the luminous efficiency of the entire device can be increased.

  Furthermore, the organic EL element used in the present invention may adopt a microcavity structure. This is because the organic EL device has a structure in which the light emitting layer is sandwiched between the anode and the cathode, and the emitted light causes multiple interference between the anode and the cathode, but the reflectance and transmission of the anode and the cathode This is a technology that actively uses the multiple interference effect and controls the emission wavelength extracted from the device by appropriately selecting the optical characteristics such as the rate and the film thickness of the organic layer sandwiched between them. . Thereby, it is also possible to improve the emission chromaticity. For the mechanism of this multiple interference effect, see J.A. Yamada et al., AM-LCD Digest of Technical Papers, OD-2, p. 77-80 (2002).

  As described above, an RGB color filter layer is produced in parallel with a glass substrate, and a light emitting layer (backlight) produced using the ITO electrode layer and the organic EL element is placed on the color filter layer. As a result, color display is possible, and a color display device is obtained. that time. A color display device having a high contrast ratio can be realized by controlling the flow of current during light emission using TFTs.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited thereto. In the following, “parts” means “parts by weight” unless otherwise specified.
Further, the weight average molecular weight (Mw) of the resin was measured by using TSKgel column (manufactured by Tosoh Corp.) and GPC equipped with RI detector (manufactured by Tosoh Corp., HLC-8120GPC) using polystyrene as a developing solvent. It is a weight average molecular weight (Mw) in terms of conversion.

  First, production examples of organic EL elements used in Examples and Comparative Examples, preparation of an acrylic resin solution, production method of a micronized pigment, and production method of a pigment dispersion will be described.

<Example of manufacturing organic EL element>
The production example of the organic EL element used as a white light source is specifically shown below. In the production examples of organic EL elements, all the mixing ratios are weight ratios unless otherwise specified. Vapor deposition (vacuum deposition) was performed in a vacuum of 10 ⁻⁶ Torr and under conditions without temperature control such as substrate heating and cooling. In the evaluation of the light emission characteristics of the element, the characteristics of an organic EL element having an electrode area of 2 mm × 2 mm were measured.

  After the cleaned glass plate with the ITO electrode was treated with oxygen plasma for about 1 minute, 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (α-NPD) was vacuum deposited, A hole injection layer having a thickness of 150 nm was obtained. On the hole injection layer, the compound (R-2) and the compound (R-3) shown in Table 4 are further co-evaporated at a composition ratio of 100: 2 to form a first light emitting layer having a thickness of 10 nm. did. Further, the compound (B-1) and the compound (B-4) in Table 2 were co-evaporated at a composition ratio of 100: 3 to form a second light emitting layer having a thickness of 20 nm. On this light emitting layer, 5 nm of α-NPD and 20 nm of the compound (G-3) in Table 3 were further evaporated to form a third light emitting layer. Further, a tris (8-hydroxyquinoline) aluminum complex was vacuum-deposited to form an electron injection layer having a film thickness of 35 nm, and then an electrode was formed by first depositing 1 nm of lithium fluoride and then 200 nm of aluminum. The organic EL element was obtained.

Furthermore, in order to protect this organic EL element from the surrounding environment, it was hermetically sealed in a dry glow box filled with pure nitrogen. This device produced white light emission with a direct current voltage of 5 V and an emission luminance of 950 (cd / m ² ), a maximum emission luminance of 55000 (cd / m ² ), and an emission efficiency of 3.9 (lm / W). FIG. 1 shows the obtained emission spectrum.

  The peak wavelengths (λ1) and (λ2) at which the emission intensity becomes maximum in the range of 430 nm to 485 nm and the wavelength of 580 nm to 620 nm of the organic EL element (EL-1), the emission intensity I1 at the wavelength λ1 and the emission wavelength I2 at the wavelength λ2, respectively. Table 4 shows the ratio (I2 / I1) of the emission intensity I2.

<Preparation of acrylic resin solution>
[Preparation of acrylic resin solution 1]
A reaction vessel equipped with a separable four-necked flask equipped with a thermometer, a cooling tube, a nitrogen gas introduction tube, and a stirrer was charged with 70.0 parts of cyclohexanone, heated to 80 ° C., purged with nitrogen in the reaction vessel, and then dropped. N-Butyl methacrylate 13.3 parts, 2-hydroxyethyl methacrylate 4.6 parts, methacrylic acid 4.3 parts, paracumylphenol ethylene oxide modified acrylate (“Aronix M110” manufactured by Toagosei Co., Ltd.) from the tube A mixture of 0.4 part of 2,2′-azobisisobutyronitrile was added dropwise over 2 hours. After completion of the dropping, the reaction was further continued for 3 hours to obtain an acrylic resin solution having a solid content of 30% by weight and a weight average molecular weight of 26000.
After cooling to room temperature, about 2 g of the resin solution was sampled, heated and dried at 180 ° C. for 20 minutes to measure the nonvolatile content, and cyclohexanone was added to the previously synthesized resin solution so that the nonvolatile content was 20% by weight. Thus, an acrylic resin solution 1 was prepared.

[Preparation of acrylic resin solution 2]
A reaction vessel equipped with a separable four-necked flask equipped with a thermometer, a cooling tube, a nitrogen gas introduction tube, and a stirrer was charged with 520.0 parts of cyclohexanone, heated to 80 ° C., and purged with nitrogen in the reaction vessel. From the tube, 7.0 parts of methacrylic acid, 32.0 parts of benzyl methacrylate, 101.0 parts of 2-hydroxyethyl methacrylate, 11.0 parts of methyl methacrylate, 2,2′-azobisiso A mixture of 2.0 parts of butyronitrile was added dropwise over 2 hours. After completion of the dropwise addition, the reaction was continued for another 3 hours, and 1.0 part of azobisisobutyronitrile dissolved in 50 parts of cyclohexanone was added, and the reaction was further continued at 80 ° C. for 1 hour to obtain a copolymer solution. Got. Next, with respect to 337 parts of the obtained copolymer solution, a mixture of 33.0 parts of 2-methacryloylethyl isocyanate, 0.4 part of dibutyltin laurate and 130.0 parts of cyclohexanone was subjected to a condition at 70 ° C. For 3 hours.
After cooling to room temperature, about 2 g of the resin solution was sampled, heated and dried at 180 ° C. for 20 minutes to measure the nonvolatile content, and cyclohexanone was added to the previously synthesized resin solution so that the nonvolatile content was 20% by weight. Then, an acrylic resin solution 2 as a photosensitive resin solution was prepared. The obtained photosensitive resin had a weight average molecular weight of about 37,000 and a double bond equivalent of 460.

<Method for producing refined pigment>
[Production of red-treated pigment (PR-1)]
Red pigment C.I. I. Pigment Red 177 ("CROMOPHTAL RED A2B" manufactured by Ciba Japan), 8 parts of pigment derivative A-2 shown in Table 5, 1600 parts of sodium chloride, and 190 parts of diethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.) It was charged into a gallon kneader (manufactured by Inoue Seisakusho) and kneaded at 60 ° C. for 10 hours. Next, this mixture is poured into about 5 liters of warm water, heated to about 70 ° C. and stirred with a high speed mixer for about 1 hour to form a slurry, then filtered and washed to remove sodium chloride and diethylene glycol, It dried at 80 degreeC for 24 hours, and obtained 156 parts of red process pigment (PR-1).

[Production of red-treated pigment (PR-2)]
Red pigment C.I. I. 500 parts of Pigment Red 179 pigment (BASF Japan Co., Ltd. “Pariogen Maroon L-3920”), 500 parts of sodium chloride, and 250 parts of diethylene glycol were charged into a stainless gallon kneader (manufactured by Inoue Seisakusho) at 120 ° C. for 8 hours. Kneaded. Next, the kneaded product is poured into 5 liters of warm water, stirred for 1 hour while heating to 70 ° C. to form a slurry, repeatedly filtered and washed with water to remove sodium chloride and diethylene glycol, and then dried at 80 ° C. overnight. 490 parts of red-treated pigment (PR-2) were obtained.

[Production of green-treated pigment (PG-1)]
500 parts of phthalocyanine-based green pigment CI Pigment Green 7 (“Lionol Green YS-07” manufactured by Toyo Ink Mfg. Co., Ltd.), 500 parts of sodium chloride, and 250 parts of diethylene glycol are charged into a 1 gallon kneader (manufactured by Inoue Seisakusho), 120 The mixture was kneaded at 4 ° C. for 4 hours. Next, the kneaded product is poured into 5 liters of warm water, stirred for 1 hour while heating to 70 ° C. to form a slurry, filtered and washed repeatedly to remove sodium chloride and diethylene glycol, and then dried at 80 ° C. overnight. And 490 parts of green-treated pigment (PG-1) was obtained.

[Production of yellow-treated pigment (PY-1)]; Yellow pigment (B)
Except for changing the phthalocyanine green pigment CI Pigment Green 7 to the isoindoline yellow pigment CI Pigment Yellow 185 ("Paliogen Yellow D1155" manufactured by BASF) and changing the kneading time from 4 hours to 8 hours, the green treated pigment (PG- In the same manner as in the preparation of 1), 490 parts of a yellow-treated pigment (PY-1) was obtained.

[Production of yellow-treated pigment (PY-2)]; Yellow pigment (B)
Except for changing the phthalocyanine green pigment CI Pigment Green 7 to the isoindolinone yellow pigment CI Pigment Yellow 139 (“Irgafore Yellow 2R-CF” manufactured by Ciba Japan) and changing the kneading time from 4 hours to 8 hours, it is green. In the same manner as in the preparation of the treated pigment (PG-1), 490 parts of a yellow treated pigment (PY-2) was obtained.

[Production of yellow-treated pigment (PY-3)]; Yellow pigment (B)
Green treated pigment (PG-1) except that the phthalocyanine green pigment CI Pigment Green7 was changed to the azo yellow pigment CI Pigment Yellow 150 ("E-4GN" manufactured by LANXESS) and the kneading time was changed from 4 hours to 8 hours. 490 parts of a yellow-treated pigment (PY-3) was obtained in the same manner as in the preparation of

[Production of yellow-treated pigment (PY-4)]; Yellow pigment (B)
Except for changing the phthalocyanine green pigment CI Pigment Green 7 to the quinophthalone yellow pigment CI Pigment Yellow 138 (BASF "Pariol Yellow K0960-HD") and changing the kneading time from 4 hours to 8 hours, the green processing pigment (PG In the same manner as in the preparation of -1), 490 parts of a yellow-treated pigment (PY-4) was obtained.

[Production of blue-treated pigment (PB-1)]
200 parts of blue pigment CI Pigment Blue 15: 6 (“LIONOL BLUE ES” manufactured by Toyo Ink Manufacturing Co., Ltd.), 1600 parts of sodium chloride, and 100 parts of diethylene glycol (manufactured by Tokyo Chemical Industry Co., Ltd.) And kneaded at 70 ° C. for 12 hours. Next, this mixture is poured into about 5 liters of warm water, heated to about 70 ° C. and stirred with a high speed mixer for about 1 hour to form a slurry, then filtered and washed to remove sodium chloride and diethylene glycol, It dried at 80 degreeC for 24 hours, and obtained 198 parts of blue process pigments (PB-1).

[Production of blue-treated pigment (PB-2)]; Pigment (A) having a structure represented by formula (1)
In a reaction vessel equipped with a 100 mL separable three-necked flask equipped with a thermometer, a condenser tube, a nitrogen gas inlet tube, and a stirring device, 20 parts of 1-chloronaphthalene, 0.12 parts of urea, 9.13 parts of 4-fluoro While adding phthalonitrile and 2.0 parts of aluminum chloride, the reaction vessel was purged with nitrogen while raising the temperature with a mantle heater, and stirred at 210 ° C. until the reaction product turned blue-green. After an exothermic reaction appeared, a blue color was observed by refluxing under a condition where the temperature was raised to 255 ° C., and then the mixture was allowed to stand at 255 ° C. for 3 hours. Then, after cooling to 100 degreeC and adding 60 mL xylene, it stirred for 20 minutes.
Next, the mixture was filtered and the collected precipitate was washed with 50 mL of xylene and then with 100 mL of acetone. The washed precipitate was put into a 250 mL Erlenmeyer flask, 50 mL of 5 mL of 5 wt% sodium hydroxide aqueous solution was added, and the mixture was stirred with a stirrer for 20 minutes. Undissolved material was collected on a Buchner funnel and washed with 50 mL acetone, then with 50 mL ligroin and dried on a Buchner funnel. The product was returned to the Erlenmeyer flask and 5% by weight of aqueous ammonia was added and stirred. The supernatant became clear and the resulting solid was collected on a Buchner funnel. Next, it was washed with 50 mL of distilled water twice and 100 mL of acetone, dried on a Buchner funnel for 20 minutes, then transferred to a 250 mL Erlenmeyer flask, and 100 mL of acetone was added. After boiling for 15 minutes on a hot plate, the mixture was filtered, dried on a Buchner funnel for 15 minutes, and then dried in a vacuum oven at 60 ° C. overnight. By the above method, a blue-treated pigment (PB-2), which is the pigment (A) having the structure of formula (1), was obtained.

[Production of purple-treated pigment (PV-1)]
200 parts of purple pigment CI Pigment Violet 23 (“LIONOGEN VIOLET RL” manufactured by Toyo Ink Manufacturing Co., Ltd.), 1600 parts of sodium chloride, and 100 parts of diethylene glycol (manufactured by Tokyo Kasei Co., Ltd.) are charged into a 1 gallon kneader (manufactured by Inoue Seisakusho). And kneading at 90 ° C. for 3 hours. Next, this mixture is poured into about 5 liters of warm water, heated to about 70 ° C. and stirred with a high speed mixer for about 1 hour to form a slurry, then filtered and washed to remove sodium chloride and diethylene glycol, It was dried at 80 ° C. for 24 hours to obtain 198 parts of purple-treated pigment (PV-1).

<Method for producing pigment dispersion>
[Preparation of pigment dispersions (DR-1, 2, DG-1 to 5, DY-1 to 4, DB-1, 2, DV-1)]
A mixture of the dye derivative, the pigment, the acrylic resin solution 1, the resin-type dispersant, and the organic solvent described in Table 5 was uniformly stirred and mixed with the composition and blending amount described in Tables 6 and 7, and then zirconia beads having a diameter of 1 mm were used. The mixture was dispersed for 5 hours with an Eiger mill (“Mini Model M-250 MKII” manufactured by Eiger Japan). Thereafter, 30.0 parts of propylene glycol monomethyl ether acetate (hereinafter sometimes abbreviated as PGMAc) was added, followed by filtration with a 5 μm filter to prepare each pigment dispersion.

[Examples 1-17, Comparative Examples 1-4]
(Production of green coloring composition (alkali development type coloring resist material) (RG-1 to 21))
The mixture shown in Tables 8 to 10 was stirred and mixed to be uniform, and then filtered through a 1 μm filter to obtain a green colored composition (alkali development type colored resist material).

Abbreviations in Tables 8 to 10 are shown below.
Photopolymerization initiator / sensitizer: “Irgacure OXE-01”, “Irgacure OXE-02”, “Irgacure 907”, “Irgacure 379” manufactured by Ciba Japan
"EAB-F" manufactured by Hodogaya Chemical Co., Ltd., "Lucirin TPO" manufactured by BASF, and "Kayacure DETX-S" manufactured by Nippon Kayaku Co., Ltd.
Monomer: “Aronix M402” manufactured by Toagosei Co., Ltd., “KAYARAD DPCA-30”, “KAYARAD DPCA-60” manufactured by Nippon Kayaku Co., Ltd.
Leveling agent solution: A solution obtained by diluting 1 part of “FZ-2122” (non-volatile content: 100% by weight) manufactured by Toray Dow Corning with 99 parts of cyclohexanone

[Examples 18 to 36, Comparative Examples 5 to 8]
(Production of green filter segment (FG-1 to 23))
A black matrix was patterned on a glass substrate, and a green coloring composition shown in Tables 8 to 10 was applied on the substrate with a spin coater to form a film of the green coloring composition. The film was irradiated with ultraviolet rays of 150 mJ / cm ² through a photomask using an ultrahigh pressure mercury lamp. Next, an alkali developer composed of 0.1% by weight of sodium carbonate 0.15% by weight sodium hydrogen carbonate 0.05% by weight anionic surfactant (“PERILEX NBL” manufactured by Kao Corporation) and 99.7% by weight of water After removing the unexposed portion by spray development, the substrate is washed with ion-exchanged water, and this substrate is heated at 230 ° C. for 20 minutes to form green filter segments (FG-1 to 23) having the film thicknesses shown in Table 11. did.

(Chromaticity film thickness evaluation)
Table 11 shows the chromaticity and film thickness when the green filter segments (FG-1 to 23) obtained in Examples and Comparative Examples are combined with the organic EL element (EL-1).

(Evaluation of coating unevenness)
Each green coloring composition was spin-coated on a 360 mm × 465 mm × 0.7 mm glass substrate under the conditions that the finished film thickness was the value described in Table 11, and dried under reduced pressure to 0.5 Torr. The substrate was allowed to transmit light from a sodium lamp in a dark room, and coating unevenness was visually evaluated according to the following criteria. The evaluation results are shown in Table 11.
○: Unevenness is not observed, and the level is good.
(Triangle | delta): Although the coating film center part looks a little thick, it is a practical level.
X: The level at which the center of the coating film is greatly raised is not suitable for practical use.

Example 18 in which the green filter segments (FG-20 to 23) of Comparative Examples 5 to 8 prepared using the green coloring composition (RG-18 to 21) have the same chromaticity coordinates (x, y). When compared with -20 green filter segments (FG-1 to FG-3), the blue treatment is the pigment (A) having the structural formula represented by the formula (1) when the chromaticity coordinates (x, y) are equivalent The brightness Y of (FG-1 to 3) made of a green coloring composition containing the pigment (PB-2) and the yellow pigment (B) was a large value.
In particular, the green coloring composition (RG-2-4, RG-2-4) in which the ratio of the pigment (A) having the structural formula represented by the formula (1) and the yellow pigment (B) is in the range of 75:25 to 20:80. For the green filter segments (FG-2 to 6, FG-9 to 18) of Examples 19 to 23 and Examples 26 to 35 formed using 7 to 16), the thickness of the colored pattern is less than 3.5 μm. The chromaticity coordinates (x, y) satisfy 0.180 ≦ x ≦ 0.225 and 0.650 ≦ y ≦ 0.715, and the color reproducibility was particularly good.
Moreover, it was obtained by mixing the dispersion (DB-2) of (PB-2) and the dispersion (DY-1) of (PY-1) (RG-1 to RG-3, RG-5, 6). And the coating unevenness of (RG-4, RG-10-16) obtained using dispersions (DG-2-5) in which (PB-2) and (PY-1) are dispersed together, Since the fluidity of the dispersions (RG-4, RG-10 to 16) in which the pigment (A) and the yellow pigment (B) were dispersed together was excellent, the coating unevenness was good.

(Production of color filter)
(Preparation of blue coloring composition (RB-1) and red coloring composition (RR-1))
The blue colored composition (RB-1) and the red colored composition (RR-1) were changed in the same manner as in Example 1 except that the compositions and amounts (parts by weight) shown in Table 12 and Table 13 were changed. Produced.

Abbreviations in Table 12 and Table 13 are shown below.
Photopolymerization initiator: “Irgacure OX-01” manufactured by Ciba Japan
・ Monomer: “Aronix M402” manufactured by Toagosei Co., Ltd.
Leveling agent solution: A solution obtained by diluting 1 part of “FZ-2122” (non-volatile content: 100% by weight) manufactured by Toray Dow Corning with 99 parts of cyclohexanone

A black matrix is patterned on a glass substrate, and a red colored composition (RR-1) is applied to the substrate with a spin coater in a white organic EL light source (EL-1) (hereinafter also used for green and blue) Formed. The film was irradiated with ultraviolet rays of 300 mJ / cm ² through a photomask using an ultrahigh pressure mercury lamp. Next, spray development was performed with an alkaline developer composed of a 0.2% by weight aqueous sodium carbonate solution to remove unexposed portions, followed by washing with ion-exchanged water. The substrate was heated at 230 ° C. for 20 minutes, so that x = A red filter segment with 0.665 and y = 0.326 was formed.
Similarly, x = 0.140 using the blue coloring composition (RB-1) so that x = 0.207 using the green coloring composition (RG-4), and y = 0.700. A green filter segment and a blue filter segment such that y = 0.060 were formed to obtain a color filter.

  When the green coloring composition in the present invention is used, when a white organic EL light source (EL-1) is used, a color filter having a green filter segment excellent in color density, color purity, and transparency in a wide chromaticity range It was possible to produce.

(Production of color display device)
An ITO electrode layer and a white organic EL light source (EL-1) were respectively mounted on the RGB color filter layers produced side by side on a glass substrate or the like as described above, thereby producing a color display device.
The color display device formed using the green coloring composition according to the present invention is capable of high brightness and a wide color reproduction region in a color display device using a white organic EL light source.

Claims (8)

A green coloring composition comprising a pigment (A) having a structure represented by the following formula (1), a yellow pigment (B), a transparent resin, a monomer and / or a polymerization initiator.
Formula (1)

  The green coloring composition according to claim 1, wherein the weight ratio of the pigment (A) to the yellow pigment (B) is 75:25 to 20:80.   The yellow pigment (B) is C.I. I. 3. The green coloring composition according to claim 1, comprising at least one yellow pigment selected from the group consisting of Pigment Yellow 138, 139, 150, and 185. 4.   The green coloring composition according to any one of claims 1 to 3, which is a green pigment dispersion obtained by dispersing a mixture containing at least the pigment (A), the yellow pigment (B) and a transparent resin.   5. A color filter comprising at least one red filter segment, at least one green filter segment, and at least one blue filter segment, wherein the at least one green filter segment is the green coloring composition according to claim 1. A color filter formed by an object.   The color filter according to claim 5, wherein the color filter is for a light emitting device having a white organic EL light source.   At least one green filter segment has a spectral characteristic having two or more maximum values within a wavelength range of 400 nm to 700 nm, and has a maximum emission intensity within a wavelength range of 430 nm to 485 nm and a wavelength range of 580 nm to 620 nm. And has a light emission spectrum in which the ratio (I2 / I1) of the emission intensity I1 at the wavelength λ1 to the emission intensity I2 at the wavelength λ2 is 0.4 or more and 0.9 or less. The XYZ color system chromaticity coordinates measured using a white organic EL light source satisfy 0.180 ≦ x ≦ 0.225 and 0.650 ≦ y ≦ 0.715, and the thickness of the colored layer pattern is 3. The color filter according to claim 6, wherein the color filter is less than 5 μm.   A color display device comprising the color filter according to claim 6 and a light emitting device having a white organic EL light source.

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