WO2022131363A1 - 波長変換部材、発光装置および液晶表示装置 - Google Patents

波長変換部材、発光装置および液晶表示装置 Download PDF

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WO2022131363A1
WO2022131363A1 PCT/JP2021/046727 JP2021046727W WO2022131363A1 WO 2022131363 A1 WO2022131363 A1 WO 2022131363A1 JP 2021046727 W JP2021046727 W JP 2021046727W WO 2022131363 A1 WO2022131363 A1 WO 2022131363A1
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wavelength conversion
light
conversion member
group
conversion layer
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French (fr)
Japanese (ja)
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達也 大場
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Fujifilm Corp
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Fujifilm Corp
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Publication of WO2022131363A1 publication Critical patent/WO2022131363A1/ja
Priority to US18/334,857 priority patent/US20230324738A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/06—Luminescent materials, e.g. electroluminescent or chemiluminescent containing organic luminescent materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • F21V9/38—Combination of two or more photoluminescent elements of different materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light

Definitions

  • Patent Document 3 when a pyrromethene derivative is used as an organic light emitting material, it is better to contain each of the red light emitting material and the green light emitting material in different layers to form a laminated body than to contain the red light emitting material and the green light emitting material in the same layer. It is disclosed that purity is obtained.
  • a layer containing a red light emitting material and a layer containing a green light emitting material are independently prepared and then bonded to each other. , A complicated process was required.
  • One aspect of the present invention is a wavelength conversion member having good brightness of white light due to high color purity and capable of being formed without stacking a plurality of wavelength conversion layers, and a light emitting device and a liquid crystal display device using the wavelength conversion member.
  • the purpose is to provide.
  • Patent Document 3 discloses an example of an absorption spectrum of a red light emitting material, and it is presumed that the absorbance in the blue region is low and the amount of red fluorescence emitted is insufficient only with blue light.
  • the present inventors can increase the amount of light emitted (for example, the amount of red light emitted) by including light-scattering particles in a wavelength conversion layer containing a pyrromethene derivative, whereby materials having different emission wavelength ranges are mixed in the same layer. However, it was newly found that the color purity can be maintained.
  • one aspect of the present invention is It has a wavelength conversion layer and a base material, and has A wavelength conversion member, wherein the wavelength conversion layer contains a pyrromethene derivative and the haze of the wavelength conversion member is 80% or more and 99.5% or less. Regarding.
  • one aspect of the present invention is It has a wavelength conversion layer and a base material, and has The wavelength conversion layer contains a pyrromethene derivative and The external haze of the base material is 0.5% or more and 50% or less, and Wavelength conversion member, which has an internal haze of 30% or more. Regarding.
  • One aspect of the present invention relates to a liquid crystal display device including the above light emitting device and a liquid crystal cell.
  • the backlight unit 10 shown in FIG. 1 is a so-called direct type backlight unit.
  • the wavelength conversion member 16 shown in FIG. 2 has a configuration in which the wavelength conversion layer 21 is sandwiched between the base materials 22 corresponding to both main surfaces of the wavelength conversion layer 21.
  • the numerical range represented by using "-" means a range including the numerical values before and after "-" as the lower limit value and the upper limit value.
  • (meth) acrylate is used to indicate at least one or both of acrylate and methacrylate. The same applies to “(meth) acryloyl” and the like.
  • the wavelength conversion member 16 is a wavelength conversion member that is incident with the light emitted by the light source 18, converts the wavelength, and emits the light. As described above, the wavelength conversion member 16 is a wavelength conversion member according to one aspect of the present invention.
  • the wavelength conversion member 16 has at least a wavelength conversion layer and a base material. The substrate can support the wavelength conversion layer.
  • the wavelength conversion layer has a function of converting the wavelength of incident light and emitting it.
  • the wavelength conversion layer 21 converts at least a part of the blue light into red light or green light by the effect of the pyromethene derivative contained therein. And emit.
  • blue light is light having a emission center wavelength in a wavelength band of 400 to 500 nm.
  • the green light is light having a emission center wavelength in a wavelength band of more than 500 nm and 580 nm or less.
  • Red light is light having a emission center wavelength in a wavelength band of more than 580 nm and 750 nm or less.
  • white light can be embodied by green light and red light emitted by the wavelength conversion layer and blue light transmitted through the wavelength conversion layer.
  • the "light scattering particles” preferably refer to particles having an average particle size of 0.1 ⁇ m or more, and the average particle size is preferably in the range of 0.5 to 15.0 ⁇ m from the viewpoint of the scattering effect. , 0.7 to 12.0 ⁇ m, more preferably.
  • the "diameter R" described above is synonymous with the average particle size.
  • the "average particle size" of the light-scattering particles is a value obtained by the following method unless otherwise specified.
  • the particles before being used for preparing the composition for forming a wavelength conversion layer are referred to as “powder”.
  • the particles to be measured are observed with a scanning electron microscope (SEM) and photographed at a magnification of 1000 to 20000 times. Observe the powder for particles that exist as powder.
  • SEM scanning electron microscope
  • the primary particle size is measured from the captured image.
  • the average value of the length of the major axis and the length of the minor axis is obtained, and this is adopted as the primary particle diameter.
  • the particle size of each particle is the primary particle size thus obtained.
  • the arithmetic mean of the primary particle diameters of 20 randomly selected particles is taken as the average particle size.
  • the average particle size of the light-scattering particles shown in the examples described later is a value obtained by observing and measuring the cross section of the wavelength conversion layer using S-3400N manufactured by Hitachi High-Tech Corporation as a scanning electron microscope. Is.
  • two or more kinds of light scattering particles having different particle sizes may be mixed and used.
  • Particles with a large particle size are called particles with a large particle size
  • particles with a smaller particle size than particles with a larger particle size are called particles with a smaller particle size.
  • the particle size is preferably in the range of 5.0 ⁇ m to 15.0 ⁇ m, and more preferably in the range of 6.0 ⁇ m to 12.0 ⁇ m.
  • the particles having a small particle size preferably have a particle size in the range of 0.5 ⁇ m to 5.0 ⁇ m, more preferably 0.7 ⁇ m to 3.0 ⁇ m, from the viewpoint of imparting internal scattering property. ..
  • inorganic particles include simple metals such as tungsten, zirconium, titanium, platinum, bismuth, rhodium, palladium, silver, tin, platinum and gold; silica, barium sulfate, barium carbonate, calcium carbonate, talc, clay, kaolin and sulfuric acid.
  • Metal oxides such as barium, barium carbonate, calcium carbonate, alumina white, titanium oxide, magnesium oxide, barium oxide, aluminum oxide, bismuth oxide, zirconium oxide, zinc oxide; magnesium carbonate, barium carbonate, bismuth subcarbonate, calcium carbonate, etc.
  • the shape of the light-scattering particles can be any shape such as spherical, filamentary, and indefinite.
  • the light scattering particles it is possible to use particles having less directional shape (for example, particles having a spherical shape, a regular tetrahedron shape, etc.) to improve the uniformity, fluidity, and light scattering property of the composition for forming a wavelength conversion layer. It is preferable in that it can be enhanced.
  • At least a part of the surface of the inorganic particles may be covered with other components such as an inorganic substance such as alumina, silica, zinc oxide, titanium oxide and zirconium oxide, and an organic substance such as stearic acid and polysiloxane.
  • an inorganic substance such as alumina, silica, zinc oxide, titanium oxide and zirconium oxide
  • an organic substance such as stearic acid and polysiloxane.
  • the surface of the light-scattering particles for example, 50 area% or more may be covered with other components, and the entire surface of the light-scattering particles may be covered with other components.
  • the light-scattering particles can be rephrased as surface-treated light-scattering particles.
  • the content of the light scattering particles in the wavelength conversion layer is preferably 0.5% by volume or more, preferably 10% by volume or more and 70% by volume, from the viewpoint of the light scattering property of the wavelength conversion layer and the brittleness of the wavelength conversion layer. It is more preferably 20% by volume or more and 60% by volume or less.
  • the polymer dispersant is adsorbed on the light-scattering particles via a functional group having an affinity for the light-scattering particles, and the light-scattering particles are converted into a wavelength conversion layer by electrostatic repulsion and / or steric repulsion between the polymer dispersants. It can be dispersed in the forming composition. It is preferable that the polymer dispersant binds to the surface of the light-scattering particles and is adsorbed on the light-scattering particles.
  • Examples of the acidic functional group include a carboxy group (-COOH), a sulfo group (-SO 3 H), a sulfate group (-OSO 3 H), a phosphonic acid group (-PO (OH) 3 ), and a phosphate group (-OPO (-OPO)).
  • OH) 3 phosphinic acid group (-PO (OH)-), mercapto group (-SH) and the like can be mentioned.
  • Nonionic functional groups include hydroxy group, ether group, thioether group, sulfinyl group (-SO-), sulfonyl group ( -SO2- ), carbonyl group, formyl group, ester group, carbonate ester group, amide group, and the like. Examples thereof include a carbamoyl group, a ureido group, a thioamide group, a thioureido group, a sulfamoyl group, a cyano group, an alkenyl group, an alkynyl group, a phosphine oxide group and a phosphine sulfide group.
  • Acid value q ⁇ r ⁇ 5.611 / p
  • q indicates the titration amount (mL) of the 0.1 mol / L ethanol potassium hydroxide solution required for titration
  • r indicates the titer of the 0.1 mol / L ethanol potassium hydroxide solution required for titration
  • p indicates the mass (g) of the polymer dispersant.
  • Amine value y / x ⁇ 28.05
  • y indicates the titration amount (ml) of 0.5 mol / L hydrochloric acid required for titration
  • x indicates the mass (g) of the polymer dispersant.
  • the polymer dispersant may be a polymer (homopolymer) of a single polymerizable compound, or may be a copolymer (copolymer) of a plurality of types of polymerizable compounds.
  • the polymer dispersant may be either a random copolymer, a block copolymer or a graft copolymer.
  • the polymer dispersant is a graft copolymer, it may be a comb-shaped graft copolymer or a star-shaped graft copolymer.
  • the polymer dispersant may be, for example, acrylic resin, polyester resin, polyurethane resin, polyamide resin, polyether, phenol resin, silicone resin, polyurea resin, amino resin, epoxy resin, polyamine such as polyethyleneimine and polyallylamine, and polyimide. It may be there.
  • the haze of the wavelength conversion member shall be a value measured according to JIS K 7136: 2000.
  • a haze meter NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd. can be mentioned.
  • the haze is high, it is preferable if the haze is 30% or more, the haze is preferably 80% or more, more preferably 90% or more, still more preferably 90. % -99.8%. From the viewpoint of suppressing the decrease in transmittance, the haze is preferably 98% or less.
  • the internal haze of the wavelength conversion member indicates the haze generated by the internal member of the sample excluding the influence of the surface haze of the substrate, and is specifically obtained by the following measurement method.
  • a few drops of glycerin are dropped on both sides of the wavelength conversion member, and sandwiched between two glass plates (microslide glass product number S 9111, manufactured by MATSUNAMI) having a thickness of 1 mm from both sides.
  • the wavelength conversion member having both sides sandwiched between the glass plates in this way is optically completely adhered to the two glass plates, and in this state, haze measurement is performed in accordance with JIS K 7136: 2000.
  • haze (Ha) The haze measured in this way is referred to as haze (Ha).
  • glycerin glycerin are dropped between the two glass plates and sandwiched, and the haze measurement is performed in the same manner as described above.
  • the haze measured in this way is referred to as glass haze (Hb).
  • the internal haze value is calculated by subtracting the glass haze (Hb) value from the haze (Ha) value.
  • the external haze of the base material when the external haze of the base material is high, the light scattering component in the outer direction of the wavelength conversion layer is large, so that the internal scattering in the wavelength conversion layer is reduced, and as a result, the excitation light is a wavelength conversion material. It is not absorbed efficiently and tends to reduce brightness and / or color purity. From this point, the external haze of the base material is preferably 50% or less, more preferably 40% or less.
  • the external haze of the substrate can be, for example, 0.5% or more.
  • the internal haze of the wavelength conversion layer and the external haze of the base material satisfy "internal haze ⁇ 0.5 x external haze", and “internal haze ⁇ 0". It is more preferable to satisfy ".75 x external haze”, and it is further preferable that "internal haze ⁇ external haze”.
  • the pyrromethene derivative is preferably a compound represented by the following general formula (1).
  • R 1 to R 9 may be the same or different, respectively, and independently have a hydrogen atom, an alkyl group, and the like. Cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, hydroxy group, thiol group, alkoxy group, alkylthio group, arylether group, arylthioether group, aryl group, heteroaryl group, halogen, cyano group, A fused ring formed between an aldehyde group, a carbonyl group, a carboxyl group, an ester group, a carbamoyl group, an amino group, a nitro group, a silyl group, a siroxanyl group, a boryl group, a sulfo group, a phosphine oxide group, and an adjacent substituent. And selected from adipose ring.)
  • X in the general formula (1) is CR 7 and R 7 is a group represented by the general formula (2).
  • r is a hydrogen atom, an alkyl group, a cycloalkyl group, a heterocyclic group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxy group, a thiol group, an alkoxy group, an alkylthio group and an aryl ether group.
  • K is an integer in the range of 1 to 3. When k is 2 or more, r may be the same or different.
  • the compound represented by the general formula (1) is described in JP-A No. 8-509471, JP-A-2000-208262, J. Am. Org. Chem. , Vol. 64, No. 21, pp. 7813-7819 (1999), Angew. Chem. , Int. Ed. Engl. , Vol. 36, pp. It can be synthesized with reference to the method described in 1333-1335 (1997) and the like.
  • the wavelength conversion layer may appropriately contain other compounds in addition to the compound represented by the general formula (1), if necessary.
  • an assist dopant such as rubrene may be contained in order to further increase the energy transfer efficiency from the excitation light to the compound represented by the general formula (1).
  • a desired organic emission material such as a coumarin-based emission material, a perylene-based emission material, a phthalocyanine-based emission material, or a thylvene-based emission material is desired.
  • the pyrromethene derivative of the first example contained in the wavelength conversion layer is preferably a pyrromethene derivative that exhibits light emission observed in a region having a peak wavelength of 500 nm or more and 580 nm or less by using excitation light. That is, it is preferable that the wavelength conversion layer includes a wavelength conversion layer containing the following light emitting material (a).
  • the light emitting material (a) is a light emitting material that exhibits light emission observed in a region having a peak wavelength of 500 nm or more and 580 nm or less by using excitation light in a wavelength range of 400 nm or more and 500 nm or less.
  • the emission observed in the region where the peak wavelength is 500 nm or more and 580 nm or less is referred to as “green wavelength emission”.
  • the pyrromethene derivative of the second example contained in the wavelength conversion layer is preferably a pyrromethene derivative exhibiting light emission observed in a region having a peak wavelength of 580 nm or more and 750 nm or less by using excitation light. That is, it is preferable that the wavelength conversion layer includes a wavelength conversion layer containing the following light emitting material (b).
  • the light emitting material (b) is observed in a region having a peak wavelength of 580 nm or more and 750 nm or less by being excited by at least one of the excitation light in the wavelength range of 400 nm or more and 500 nm or less and the light emitted from the light emitting material (a).
  • a luminescent material that exhibits light emission.
  • the emission observed in the region where the peak wavelength is 580 nm or more and 750 nm or less is referred to as “red wavelength emission”.
  • a luminescent material exhibiting light emission observed in a region having a peak wavelength of 500 nm or more and 580 nm or less by using excitation light is also referred to as a “green illuminant”, and a peak wavelength of 500 nm or more and 580 nm or less by using excitation light is also referred to.
  • a light emitting material that exhibits light emission observed in a region is also called a "red light emitter”.
  • the wavelength conversion member contains a light emitting material (a) exhibiting green wavelength emission and a light emitting material (b) exhibiting red wavelength emission in each wavelength conversion layer, respectively, and emits blue wavelength light having a sharp emission peak as a light source.
  • a emitting blue wavelength light source for example, a blue wavelength organic EL element or a blue wavelength LED
  • the resin that forms the binder contained in the wavelength conversion layer examples include acrylic resin, epoxy resin, polyimide resin, urethane resin, urea resin, polyvinyl alcohol resin, melamine resin, polyamide resin, polyamideimide resin, polyester resin, and polyolefin resin. , Silicone resin, polycarbonate resin, cycloolefin resin, phenoxy resin, polymer dispersant and the like.
  • the binder resin may contain two or more of these, or may be a copolymer.
  • a copolymer of methyl methacrylate and an aliphatic polyolefin resin can be mentioned.
  • acrylic resin is preferable from the viewpoint of stability.
  • acrylic resin examples include a polymer of unsaturated carboxylic acid, a copolymer of unsaturated carboxylic acid and another ethylenically unsaturated compound, and the like. Among these, a copolymer of an unsaturated carboxylic acid and an ethylenically unsaturated compound is preferable.
  • Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid and the like. Two or more kinds of these may be used as unsaturated carboxylic acids.
  • Examples of the ethylenically unsaturated compound include unsaturated carboxylic acid alkyl esters, aliphatic vinyl compounds, aromatic vinyl compounds, unsaturated carboxylic acid aminoalkyl esters, unsaturated carboxylic acid glycidyl esters, carboxylic acid vinyl esters, and vinyl cyanide. Examples include compounds, unsaturated conjugated dienes, macromonomers and the like.
  • Examples of the unsaturated carboxylic acid alkyl ester include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, isopropyl acrylate, isopropyl methacrylate, n-propyl methacrylate and n acrylate.
  • Examples of the aliphatic conjugated diene include 1,3-butadiene, isoprene and the like.
  • Examples of the macromonomer include polystyrene, polymethylacrylate, polymethylmethacrylate, polybutylacrylate, polybutylmethacrylate, and polysilicone having an acryloyl group or a methacryloyl group at the terminal.
  • the acrylic resin has an ethylenically unsaturated group in the side chain.
  • the ethylenically unsaturated group include a vinyl group, an allyl group, an acrylic group, a methacrylic group and the like.
  • a method of introducing an ethylenically unsaturated group into the side chain of an acrylic resin when the acrylic resin has a carboxyl group, a hydroxy group, etc., an ethylenically unsaturated compound having an epoxy group, acrylic acid chloride, methacryl, etc. Examples thereof include a method of adding an acid chloride and the like, a method of adding a compound having an ethylenically unsaturated group using isocyanate, and the like.
  • Examples of the reactive monomer capable of forming the resin include bisphenol A diglycidyl ether (meth) acrylate, poly (meth) acrylate carbamate, modified bisphenol A epoxy (meth) acrylate, and adipic acid 1,6-hexanediol ().
  • the glass transition temperature (Tg) of the resin is preferably 50 ° C. or higher, more preferably 70 ° C. or higher, from the viewpoint of improving compatibility with the light emitting material and improving durability. It is more preferably 80 ° C. or higher, and even more preferably 90 ° C. or higher. Further, from the viewpoint that an appropriate film hardness can be obtained and cracks and the like during film formation can be suppressed, Tg is preferably 200 ° C. or lower, more preferably 180 ° C. or lower, and 170 ° C. The temperature is more preferably 160 ° C. or lower, and more preferably 160 ° C. or lower. Within the above range, higher durability can be obtained in the wavelength conversion member.
  • the glass transition temperature can be measured by a commercially available measuring instrument (for example, a differential scanning calorimetry device (DSC7000X) manufactured by Hitachi High-Tech Science Co., Ltd., a heating rate of 10 ° C./min).
  • a commercially available measuring instrument for example, a differential scanning calorimetry device (DSC7000X) manufactured by Hitachi High-Tech Science Co., Ltd., a heating rate of 10 ° C./min).
  • the density of the color filter can be reduced and the display becomes brighter. It is possible to do.
  • the SP value of the resin is SP ⁇ 12.0 (cal / cm 3 ) 0.5
  • the lengthening of the emission peak wavelength of the red light is suppressed, and as a result, the green light and the red light are combined.
  • This is preferable because the difference in emission peak wavelength is small.
  • SP ⁇ 11.0 (cal / cm 3 ) 0.5 is more preferable
  • SP ⁇ 10.8 (cal / cm 3 ) 0.5 is more preferable. ..
  • the binder resin having SP ⁇ 7.0 (cal / cm 3 ) 0.5 as the lower limit value can be suitably used because the organic light emitting material has good dispersibility.
  • SP ⁇ 8.0 (cal / cm 3 ) 0.5 is more preferable, and SP ⁇ 8.5 (cal / cm 3 ) 0.5 is more preferable. More preferably, SP ⁇ 9.0 (cal / cm 3 ) 0.5 , and even more preferably SP ⁇ 9.5 (cal / cm 3 ) 0.5 .
  • the solubility parameter is a commonly used Poly. Eng. Sci. , Vol. 14, No. 2, pp. It is a value calculated from the type and ratio of the monomers constituting the resin by using the estimation method of Fedors described in 147-154 (1974) and the like.
  • a mixture of a plurality of types of resins can be calculated by the same method.
  • the SP value of polymethyl methacrylate can be calculated as 9.7 (cal / cm 3 ) 0.5
  • PET polyethylene terephthalate
  • the SP value of the bisphenol A-based epoxy resin can be calculated as 10.9 (cal / cm 3 ) 0.5 .
  • the weight average molecular weight (Mw) of the resin is preferably 5,000 or more, more preferably 15,000 or more, still more preferably 20,000 or more, still more preferably 500,000 or less, and more preferably. Is 100,000 or less, and even more preferably 50,000 or less.
  • Mw weight average molecular weight
  • the weight average molecular weight in the present invention and the present specification is a value measured by a gel permeation chromatography method (GPC method). Specifically, after filtering the sample with a membrane filter having a pore size of 0.45 ⁇ m, GPC (Tosoh HLC-82A) (developing solvent: toluene, developing speed: 1.0 mL / min, column: Tosoh TSKgelG2000HXL) is used. It is a value obtained by polystyrene conversion.
  • GPC gel permeation chromatography method
  • the method for synthesizing the above resin is not particularly limited, and a known method can be appropriately used, and a commercially available product can also be used.
  • Examples of the photopolymerization initiator that can be used to form the binder resin include benzophenone-based compounds, acetophenone-based compounds, anthraquinone-based compounds, imidazole-based compounds, benzothiazole-based compounds, benzoxazole-based compounds, and oxime ester compounds. , Triazine-based compounds, phosphorus-based compounds, inorganic photopolymerization initiators such as titanate, and the like.
  • the photopolymerization initiator may contain two or more of these. In order to easily adjust the content of the photopolymerization initiator to a preferable range described later, a nitrocarbazole-based oxime ester compound is preferable.
  • examples of the benzophenone compound include benzophenone, N, N'-tetraethyl-4,4'-diaminobenzophenone, and 4-methoxy-4'-dimethylaminobenzophenone.
  • examples of the acetophenone compound include 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, ⁇ -hydroxyisobutylphenone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4-.
  • anthraquinone compounds include t-butyl anthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chlor-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, and 9,10-phenanthra.
  • Examples thereof include quinone, 1,2-benzoanthraquinone, 1,4-dimethylanthraquinone, and 2-phenylanthraquinone.
  • the imidazole compound include 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer and the like.
  • Examples of the benzothiazole compound include 2-mercaptobenzothiazole.
  • Examples of the benzoxazole compound include 2-mercaptobenzoxazole.
  • Examples of the triazine compound include 4- (p-methoxyphenyl) -2,6-di- (trichloromethyl) -s-triazine.
  • Examples of the oxime ester compound include 1,2-octanedione, 1- [4- (phenylthio) -2- (O-benzoyloxime)] (“IRGACURE” (registered trademark) OXE01, manufactured by BASF), etanone, 1-.
  • the content of the photopolymerization initiator is preferably 1% by mass or more in the solid content of the composition for forming a wavelength conversion layer from the viewpoint of suppressing surface roughness, and from the viewpoint of compatibility. It is preferably 10% by mass or less of the solid content.
  • the composition for forming a wavelength conversion layer may contain a chain transfer agent together with a photopolymerization initiator.
  • Examples of the organic solvent contained in the composition for forming a wavelength conversion layer include diethylene glycol monobutyl ether acetate, benzyl acetate, ethyl benzoate, methyl benzoate, diethyl malonate, 2-ethylhexyl acetate, 2-butoxyethyl acetate, and ethylene glycol.
  • the organic solvent may be a mixed solvent containing two or more of these.
  • the content of the organic solvent in the wavelength conversion layer forming composition is preferably 40% by mass or more, preferably 50% by mass or more in the wavelength conversion layer forming composition from the viewpoint of improving the coatability. Is more preferable.
  • the content of this organic solvent is preferably 95% by mass or less, and more preferably 90% by mass or less in the composition for forming a wavelength conversion layer from the viewpoint of improving the drying characteristics.
  • the composition for forming a wavelength conversion layer contains a surfactant, the coatability and the uniformity of the coating film surface can be improved.
  • the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, fluorosurfactants, silicone-based surfactants and the like.
  • the anionic surfactant include ammonium lauryl sulfate, polyoxyethylene alkyl ether triethanolamine sulfate and the like.
  • the cationic surfactant include stearylamine acetate and lauryltrimethylammonium chloride.
  • amphoteric tenside agent examples include lauryldimethylamine oxide, laurylcarboxymethyl hydroxyethyl imidazolium betaine and the like.
  • nonionic surfactant examples include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, sorbitan monostearate and the like. The surfactant may contain two or more of these. The content of the surfactant is preferably 0.001% by mass or more and 10% by mass or less in the composition for forming a wavelength conversion layer from the viewpoint of the in-plane uniformity of the coating film.
  • examples of the dispersant contained in the composition for forming a wavelength conversion layer include intermediates of pigments, small molecule dispersants such as derivatives, and polymer dispersants.
  • examples of the pigment derivative contained in the composition for forming a wavelength conversion layer include an alkylamine modified product having a pigment skeleton, a carboxylic acid derivative, a sulfonic acid derivative, and the like, which contribute to appropriate wetting and / or stabilization of the pigment. Of these, a sulfonic acid derivative having a pigment skeleton, which has a remarkable effect on stabilizing the fine pigment, is preferable.
  • Examples of the polymer dispersant contained in the composition for forming a wavelength conversion layer include polymers such as polyester, polyalkylamine, polyallylamine, polyimine, polyamide, polyurethane, polyacrylate, polyimide, and polyamideimide, and co-polymers thereof. Examples include polymers.
  • the polymer dispersant may contain two or more of these. Among these polymer dispersants, those having an amine value of 5 to 200 mgKOH / g in terms of solid content and an acid value of 1 to 100 mgKOH / g are preferable. In particular, a polymer dispersant having a basic group is more preferable, and the inclusion of this polymer dispersant can improve the storage stability of the composition for forming a wavelength conversion layer.
  • Examples of commercially available polymer dispersants having a basic group include “Solspers” (registered trademark) 24000 (manufactured by Avisia), “EFKA” (registered trademark) 4300, 4330 (manufactured by Fuka), and 4340 ( Fuka), “Ajispar” (registered trademark) PB821, PB822 (Ajinomoto Fine-Techno), “BYK” (registered trademark) 161-163, 2000, 2001, 6919, 21116 (Big Chemie), etc. ..
  • the wavelength conversion member includes antioxidants, processing and heat stabilizers, light resistance stabilizers such as ultraviolet absorbers, dispersants for stabilizing coating films, and leveling.
  • antioxidants examples include phenolic antioxidants such as 2,6-di-tert-butyl-p-cresol and 2,6-di-tert-butyl-4-ethylphenol. However, it is not limited to these. Further, these antioxidants may be used alone or in combination of two or more.
  • processing and heat stabilizer examples include phosphorus-based stabilizers such as tributylphosphite, tricyclohexylphosphite, triethylphosphine, and diphenylbutylphosphine. However, it is not limited to these. Further, these stabilizers may be used alone or in combination of two or more.
  • Examples of the light resistance stabilizer include 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2H-.
  • Examples thereof include benzotriazoles such as benzotriazole. However, it is not limited to these. Further, these light resistance stabilizers may be used alone or in combination of two or more.
  • the pyromethene derivative contained in the wavelength conversion layer is excited by the excitation light, and light having a wavelength different from the excitation light is emitted to perform color conversion (that is, wavelength conversion) of the light. Since this excitation-emission cycle is repeated, the probability that singlet oxygen is generated increases due to the interaction between the generated excitation species and the oxygen contained in the wavelength conversion member. Therefore, the probability of collision between the pyrromethene derivative and the singlet oxygen also increases, and the deterioration of the pyrromethene derivative tends to proceed.
  • Pyrromethene derivative is an organic light emitting material.
  • Organic luminescent materials are more susceptible to singlet oxygen than inorganic luminescent materials.
  • the compound represented by the general formula (1) has higher reactivity with singlet oxygen than compounds having a condensed aryl ring such as perylene and derivatives thereof, and the effect of singlet oxygen on durability is large. .. Therefore, by rapidly inactivating the generated singlet oxygen by the singlet oxygen quencher, the durability of the compound represented by the general formula (1), which is excellent in emission quantum yield and color purity, is improved. be able to.
  • Examples of the compound having a role as a singlet oxygen quencher include a tertiary amine, a catechol derivative and a nickel compound. However, it is not limited to these. Further, these compounds (light resistance stabilizers) may be used alone or in combination of two or more.
  • a film made of various resin materials is preferably used in terms of easy thinning, easy weight reduction, and suitable for flexibility.
  • polyethylene polyethylene naphthalate (PEN), polyamide (PA), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyvinyl alcohol (PVA), polyacrylonitrile (PAN), polyimide (PI).
  • PE polyethylene
  • PEN polyethylene naphthalate
  • PA polyamide
  • PET polyethylene terephthalate
  • PVC polyvinyl chloride
  • PVA polyvinyl alcohol
  • PAN polyacrylonitrile
  • PI polyimide
  • Transparent Polyethylene Polymethylmethacrylate Resin (PMMA), Polycarbonate (PC), Polyacrylate, Polymethacrylate, Polypropylene (PP), Polyethylene (PS), ABS, Cycloolefin Copolymer (COC), Cycloolefin Polymer (COP)
  • a resin film made of triacetylcellulose (TAC) are preferably exemplified.
  • a gas barrier film in which a gas barrier layer exhibiting gas barrier properties is formed on these resin films can also be used as the base material 22.
  • the oxygen permeability of the base material 22 is 100 cc / (m 2 , day, atm) or less in that the deterioration of the pyrromethene derivative due to oxygen can be suitably prevented, the deterioration of the binder can be prevented, and the like.
  • a film having a low oxygen permeability that is, a film having a high gas barrier property is a dense and high-density film or a film having a dense and high-density layer, and generally has a thickness of a metal oxide or a metal nitride. Examples thereof include those formed on a film in which a layer having a thickness of ten to several hundred nm serves as a support.
  • a film having such an inorganic substance may deteriorate the optical characteristics of the wavelength conversion member 16 due to light absorption of the inorganic layer or the like.
  • the base material 22 can include one or more layers such as a hard coat layer, an anti-Newton ring layer, an antireflection layer, a low reflection layer, and an antiglare layer, if necessary, or together with (or) one layer or more of these layers. Instead of them), it may include one or more surface layers such as a light scattering layer, a primer layer, an antistatic layer, and an undercoat layer.
  • the wavelength conversion member preferably has an anti-Newton's rings layer on the surface of the base material 22.
  • an anti-Newton's rings layer By having a specific surface roughness on the surface of the base material, it is possible to reduce the contact area with other members facing each other when the backlight unit is used, and it is possible to suppress the occurrence of scratches on the surface of the wavelength conversion member. Be done.
  • the wavelength conversion member when the wavelength conversion member is arranged so as to face the optical film, it is preferable that the wavelength conversion member and the optical film do not come into close optical contact with each other.
  • the surface of the wavelength conversion member on the side facing the optical film preferably has a surface roughness, and may satisfy a specific surface roughness.
  • the anti-Newton ring layer may also serve as a light scattering layer.
  • the method of manufacturing the wavelength conversion member so as to have a specific surface roughness is not particularly limited.
  • the wavelength conversion member can be manufactured so as to have a specific surface roughness. ..
  • the material of the filler is not particularly limited, and may be an inorganic filler or an organic filler. From the viewpoint of abrasion resistance, the filler is preferably an organic filler. The higher the Young's modulus of the filler, the more the occurrence of scratches on the wavelength conversion member is suppressed, while the occurrence of scratches on the facing member may occur.
  • the Young's modulus of the filler is preferably 0.1 GPa or more and 30 GPa or less, more preferably 1 GPa or more and 10 GPa or less, and further preferably 2 GPa or more and 6 GPa or less.
  • the arithmetic mean roughness Ra is a three-dimensional (3D) microscope (for example, manufactured by Olympus, model OLS4100, magnification 10 times, manufactured by Ryoka System Co., Ltd., white interferometer VertScan (registered trademark) (Bertscan), manufactured by Zygo. A value measured using NewView7300).
  • the analysis range is a line roughness with a length of 1289 ⁇ m.
  • the analysis parameter is the roughness parameter
  • the cutoff is ⁇ C; none, ⁇ S; none, ⁇ f; none.
  • ⁇ C, ⁇ S, and ⁇ f are methods for calculating the contour curve for calculating Ra.
  • Contour curves include cross-section curves, roughness curves and swell curves.
  • the cross-section curve is a curve obtained by applying a low-pass filter having a cutoff value of ⁇ S to the measured cross-section curve.
  • the roughness curve is a contour curve obtained by blocking the long wavelength component from the cross-sectional curve by a high frequency filter having a cutoff value ⁇ C.
  • the waviness curve is a contour curve obtained by sequentially applying contour curve filters having cutoff values ⁇ f and ⁇ C to the cross-sectional curve.
  • the ⁇ f contour curve filter blocks the long wavelength component
  • the ⁇ C contour curve filter blocks the short wavelength component.
  • the wavelength conversion member 16 shown in FIG. 2 has a configuration in which the wavelength conversion layer 21 is sandwiched between the base materials 22 corresponding to both main surfaces of the wavelength conversion layer 21.
  • the present invention is not limited to this. That is, the wavelength conversion member 16 may have a configuration in which the base material 22 is provided only on one main surface of the wavelength conversion layer 21.
  • the main surface is the maximum surface such as a layer and a film-like material.
  • Wavelength conversion is possible in that the wavelength conversion layer 21 can be suitably protected, the pyromethene derivative can be prevented from being deteriorated by oxygen, and physical deformation such as curl and 1 deflection can be suppressed by increasing the rigidity of the wavelength conversion member 16.
  • the member 16 preferably has a structure in which the wavelength conversion layer 21 is sandwiched between the base materials 22.
  • the two base materials may be the same or different.
  • the wavelength conversion layer 21 is sandwiched between the base materials 22 and the two base materials are different, it is preferable that at least one base material 22 satisfies the above-mentioned oxygen permeability. It is more preferable that both sheets satisfy the above-mentioned oxygen permeability.
  • the thickness of the base material 22 is preferably in the range of 5 to 150 ⁇ m, more preferably in the range of 10 to 70 ⁇ m, and even more preferably in the range of 15 to 55 ⁇ m.
  • Making the thickness of the base material 22 5 ⁇ m or more can suitably hold and protect the wavelength conversion layer 21, prevent the pyrromethene derivative from being deteriorated by oxygen, and increase the rigidity of the wavelength conversion member 16 to curl and bend. It is preferable in that physical deformation such as can be suppressed. It is preferable that the thickness of the base material 22 is 150 ⁇ m or less in that the thickness of the entire wavelength conversion member 16 including the wavelength conversion layer 21 can be reduced.
  • the method for producing such a wavelength conversion member 16 is not particularly limited, and a known method for producing a laminated film in which a layer exhibiting an optical function is sandwiched between resin films or the like or one surface is supported is available. , Various, available. The following methods are exemplified as a preferred method for manufacturing the wavelength conversion member 16.
  • a wavelength conversion layer 21 is formed by preparing a coating liquid (a composition for forming a wavelength conversion layer), applying the coating liquid to one surface of the base material 22, and heating and drying the coating liquid.
  • a plurality of layers may be laminated as the wavelength conversion layer.
  • the coating method of the coating liquid is not particularly limited, and various known coating methods such as a spin coating method, a die coating method, a bar coating method, and spray coating can be used.
  • the method for heating and drying the coating liquid is not particularly limited, and various known methods for drying the aqueous solution, such as heating and drying using a heater, heating and drying using warm air, and heating and drying using a heater and warm air, can be used. It is possible.
  • the wavelength conversion member 16 can be manufactured.
  • the base material 22 may be attached by utilizing the adhesiveness or adhesiveness of the wavelength conversion layer 21, or if necessary, a transparent adhesive, a transparent adhesive sheet, or an optical transparent adhesive. (OCA (Optical Clear Adhesive)) or the like may be used, and a sticking agent, a sticking layer, a sticking sheet, or the like may be used.
  • OCA Optical Clear Adhesive
  • the light source 18 various known light sources can be used as long as they irradiate light having a wavelength converted by the wavelength conversion member 16 (wavelength conversion layer 21).
  • the LED Light Emitting Diode
  • the wavelength conversion layer 21 of the wavelength conversion member 16 a wavelength conversion layer in which a pyrromethene derivative is dispersed in a binder such as a resin is preferably used. Therefore, as the light source 18, a blue LED that irradiates blue light is particularly preferably used, and in particular, a blue LED having a peak wavelength of 450 nm ⁇ 50 nm is preferably used.
  • the output of the light source 18 is not particularly limited, and may be appropriately set according to the illuminance (luminance) and the like of the light required for the backlight unit 10. Further, in the backlight unit 10, the light source 18 may be one as shown in the illustrated example, or a plurality of light sources 18 may be provided.
  • the backlight unit 10 shown in FIG. 1 is a so-called direct type backlight unit.
  • the present invention is not limited to this, and can be suitably used for a so-called edge light type backlight unit using a light guide plate.
  • an edge light type backlight unit for example, one main surface of the wavelength conversion member 16 is arranged facing the light incident surface of the light guide plate, and the wavelength conversion member 16 is sandwiched between the light guide plate.
  • the light source 18 may be arranged on the opposite side to form an edge light type backlight unit.
  • a plurality of light sources 18 are usually arranged in the longitudinal direction of the light incident surface of the light guide plate, or a long light source is used in the longitudinal direction of the light incident surface of the light guide plate. Arrange in line with the longitudinal direction of.
  • a barrier film may be appropriately used as the wavelength conversion member.
  • the barrier film include inorganic oxides such as silicon oxide, aluminum oxide, titanium oxide, tantalum oxide, zinc oxide, tin oxide, indium oxide, yttrium oxide, and magnesium oxide, silicon nitride, aluminum nitride, and titanium nitride.
  • Inorganic nitrides such as silicon carbide, or mixtures thereof, or metal oxide thin films or metal nitride thin films to which other elements are added, or polyvinyl chloride resin, acrylic resin, silicone resin, melamine resin, urethane resin.
  • a film made of various resins such as a polyvinyl alcohol resin such as a fluororesin and a nitride of vinyl acetate.
  • the barrier resin preferably used for the barrier film include resins such as polyester, polyvinyl chloride, nylon, polyvinyl fluoride, polyvinylidene chloride, polyacrylonitrile, polyvinyl alcohol, and ethylene-vinyl alcohol copolymers, and resin thereof.
  • resins such as polyester, polyvinyl chloride, nylon, polyvinyl fluoride, polyvinylidene chloride, polyacrylonitrile, polyvinyl alcohol, and ethylene-vinyl alcohol copolymers, and resin thereof.
  • resins such as polyester, polyvinyl chloride, nylon, polyvinyl fluoride, polyvinylidene chloride, polyacrylonitrile, polyvinyl alcohol, and ethylene-vinyl alcohol copolymers, and resin thereof.
  • examples include a mixture of resins.
  • polyvinylidene chloride, polyacrylonitrile, ethylene-vinyl alcohol copolymer and polyvinyl alcohol preferably contain one or more of these resins because
  • polyvinyl alcohol for example, a saponified product of polyvinyl acetate obtained by saponifying 98 mol% or more of an acetyl group can be used.
  • ethylene-vinyl alcohol copolymer for example, a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 50% in which an acetyl group is saponified by 98 mol% or more can be used.
  • a commercially available resin can be used, and a commercially available film can also be used.
  • Specific examples include polyvinyl alcohol resins PVA105 and PVA117 manufactured by Kuraray, Excelval AQ-4104 manufactured by Kuraray, ethylene-vinyl alcohol copolymer (“EVAL” (registered trademark)) resins L171B and F171B manufactured by Kuraray, and films. There are EF-XL and the like.
  • Barrier films include antioxidants, curing agents, cross-linking agents, processing and heat stabilizers, UV absorbers, etc., as required, to the extent that they do not excessively affect the light emission and durability of the wavelength conversion layer.
  • a light resistance stabilizer or the like may be added.
  • the thickness of the barrier film is not particularly limited. From the viewpoint of flexibility and / or cost of the entire wavelength conversion member, the thickness of the barrier film is preferably 100 ⁇ m or less. It is more preferably 50 ⁇ m or less, further preferably 20 ⁇ m or less, still more preferably 10 ⁇ m or less, and may be 1 ⁇ m or less. However, from the viewpoint of ease of layer formation, it is preferably 0.01 ⁇ m or more.
  • the barrier film may be provided on both sides of the wavelength conversion member, or may be provided on only one side.
  • antireflection function antiglare function, antireflection antiglare function, hard coat function (friction resistance function), antistatic function, antifouling function, electromagnetic wave shielding function, infrared rays
  • An auxiliary layer having a cut function, an ultraviolet ray cut function, a polarization function, a toning function, and the like may be provided.
  • the wavelength conversion member may be composed of only a base material and a wavelength conversion layer, may be composed of only a base material, a wavelength conversion layer, and a barrier film, or may have a structure having one or more layers.
  • An example of such a layer is an organic layer.
  • the "organic layer” is a layer containing an organic substance as a main component.
  • the organic layer may be a layer having an organic substance content of 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more or 99% by mass or more. can.
  • it may be a layer composed only of organic substances.
  • the layer composed of only organic substances means a layer containing only organic substances, excluding impurities inevitably mixed in the manufacturing process.
  • only one kind of organic substance may be contained, or two or more kinds may be contained.
  • the organic layer can include a cardopolymer.
  • the adhesion between the organic layer and the adjacent layer, particularly the adhesion with the inorganic layer becomes stronger, which is preferable.
  • the cardopolymer reference can be made to paragraphs 805 to 095 of JP-A-2005-096108.
  • the functional number for a "(meth) acrylamide compound” refers to the number of (meth) acrylamide groups contained in one molecule of this compound. Regarding the (meth) acrylamide compound, "monofunctional” means that the number of (meth) acrylamide groups contained in one molecule is one, and “polyfunctional” means that it is contained in one molecule (). Meta) It is assumed that the number of acrylamide groups is two or more.
  • the organic layer containing the (meth) acrylamide compound can be formed by using a polymerizable composition containing the (meth) acrylamide compound.
  • the (meth) acrylamide compound is a polymerizable compound, and the polymerizable composition may contain one or more (meth) acrylamide compounds as the polymerizable compound.
  • the above polymerizable composition may contain a known polymerization initiator.
  • the polymerization initiator is not particularly limited, and for example, paragraph 0079 of International Publication No. 2019/004431 can be referred to.
  • the organic layer can be formed on the surface of the barrier film, on the surface of the substrate, or on the surface of the wavelength conversion layer by a method known as a film forming method using a polymerizable composition.
  • the thickness of the organic layer is preferably in the range of 0.05 to 10.00 ⁇ m, more preferably in the range of 0.50 to 5.00 ⁇ m.
  • Example A1 Preparation of composition for forming wavelength conversion layer
  • a light-scattering particle dispersion 1 was prepared using toluene as a solvent of silicone resin particles (Tospearl 120 manufactured by Momentive Co., Ltd., average particle size 2.0 ⁇ m).
  • the solid content concentration of the light scattering particle dispersion liquid 1 was 30% by mass.
  • wavelength conversion member A1 As a base material, two PET films having a thickness of 50 ⁇ m (Cosmo Shine A4300 manufactured by Toyobo Co., Ltd.) were prepared. The prepared composition for forming a wavelength conversion layer 1 was applied to one surface of one of the base materials by a die coater. Next, the wavelength conversion layer A1 was formed on the substrate by drying the composition 1 for forming the wavelength conversion layer in a heating furnace having an in-core temperature of 95 ° C. for 30 minutes. The thickness of the formed wavelength conversion layer was 22 ⁇ m.
  • the wavelength conversion layer is sandwiched between the two base materials by laminating the other base material (PET film) on the formed wavelength conversion layer 1 and attaching the other base material (PET film) with an adhesive (3M Co., Ltd., 8172CL). Then, a wavelength conversion member as shown in FIG. 2 was manufactured.
  • the amount of the light-scattering particle dispersion 1 added to the composition 1 was adjusted so that the haze of the wavelength conversion member A1 was 90%.
  • the haze of the obtained wavelength conversion member 1 was measured using a haze meter NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd. in accordance with JIS K 7136: 2000.
  • Example A2 In Example A1, the wavelength conversion member A2 having the wavelength conversion layer 2 formed was produced in the same manner except that the pyrromethene derivative G-1 was replaced with G-2. The haze of the wavelength conversion member A2 was measured in the same manner as in Example A1, and a result of 90% was obtained.
  • Example A3 The wavelength conversion member A3 was produced in the same manner as in Example A1 except that the light scattering particles were changed from silicone resin particles to benzoguanamine / formaldehyde condensate particles (Eposter MS, manufactured by Nippon Catalyst Co., Ltd., average particle size 2.0 ⁇ m). .. The haze of the wavelength conversion member A3 was measured in the same manner as in Example A1, and a result of 95% was obtained.
  • Example A4 The wavelength conversion member A4 was produced in the same manner as in Example A1 except that the light scattering particles were changed from silicone resin particles to rutile type titanium oxide particles (D-918, manufactured by Sakai Chemical Industry Co., Ltd., average particle size 0.26 ⁇ m). did. The haze of the wavelength conversion member 4 was measured in the same manner as in Example A1, and a result of 90% was obtained.
  • Example B1 In Example A1, the wavelength conversion member B1 was produced in the same manner as in Example A1 except that the amount of the light scattering particles added was adjusted so that the haze of the wavelength conversion layer conversion member was 70%.
  • Example B2 In Example A1, the wavelength conversion member B2 was produced in the same manner as in Example A1 except that the light scattering particles were not added.
  • the manufactured backlight unit is turned on so that the entire surface is displayed in white, and the initial brightness is measured using a luminance meter (manufactured by TOPCON, SR3) installed at a position 520 mm in the direction perpendicular to the surface of the light guide plate.
  • the value Y0 (cd / m 2 ) was measured and evaluated based on the following evaluation criteria.
  • the wavelength conversion member of each of the above examples contains pyrromethene derivatives having different emission wavelength ranges in the same layer. From the results shown in Table 1, the haze value of the wavelength conversion member can be increased by including light scattering particles in such a layer, and in Examples A1 to A4 having a haze value of 80% or more, the brightness of white light. It turns out that is good.
  • the pyromethene derivative G-1 is 0.40 parts by mass
  • the pyromethene derivative R-1 is 0.01 parts by mass
  • the organic substance surface treatment is applied as light scattering particles.
  • Alumina-coated titanium oxide particles Ti-pure R-706, manufactured by Chemers).
  • the prepared composition for forming a wavelength conversion layer was applied to one surface of one of the base materials 22 by a bar coater (bar count # 30).
  • a PET film Cosmo Shine A4360 manufactured by Toyobo Co., Ltd.
  • the internal haze of the wavelength conversion member and the external haze of the base material were the values shown in the table below.

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