WO2021106556A1 - Élément de conversion de longueur d'onde et son procédé de fabrication, unité de rétroéclairage et dispositif d'affichage d'image - Google Patents

Élément de conversion de longueur d'onde et son procédé de fabrication, unité de rétroéclairage et dispositif d'affichage d'image Download PDF

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WO2021106556A1
WO2021106556A1 PCT/JP2020/041943 JP2020041943W WO2021106556A1 WO 2021106556 A1 WO2021106556 A1 WO 2021106556A1 JP 2020041943 W JP2020041943 W JP 2020041943W WO 2021106556 A1 WO2021106556 A1 WO 2021106556A1
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layer
wavelength conversion
meth
acrylate
metal oxide
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PCT/JP2020/041943
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English (en)
Japanese (ja)
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紀一 福原
里奈 伊豆
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昭和電工マテリアルズ株式会社
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Publication of WO2021106556A1 publication Critical patent/WO2021106556A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • 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

Definitions

  • the present disclosure relates to a wavelength conversion member and its manufacturing method, a backlight unit, and an image display device.
  • a backlight unit is provided in an image display device such as a liquid crystal display device.
  • the backlight unit includes a wavelength conversion member including a phosphor that emits light from a light source.
  • a wavelength conversion member including a quantum dot phosphor that emits red light and a quantum dot phosphor that emits green light when used, when the wavelength conversion member is irradiated with blue light as excitation light, the quantum dot phosphor White light can be obtained from the red light and green light emitted from the light and the blue light transmitted through the wavelength conversion member.
  • the wavelength conversion member containing a phosphor usually has a cured product obtained by curing a curable composition containing a phosphor. Further, in the wavelength conversion member containing a phosphor, at least a part of the cured product containing the phosphor may be covered with a coating material. For example, in the case of a film-shaped wavelength conversion member, a barrier film having a barrier property against oxygen may be provided on one side or both sides of the cured product containing a phosphor.
  • Patent Document 1 includes an end face sealing layer covering the end face of the wavelength conversion layer including the gas barrier layer, and the end face sealing layer is the first.
  • a wavelength conversion laminated film containing a metal layer, a resin layer, and a second metal layer in this order has been proposed.
  • the wavelength conversion laminated film described in Patent Document 1 requires steps such as metal sputtering, resin layer formation, and electroless plating at the end of the wavelength conversion layer, which is complicated. In view of this situation, a method of suppressing deterioration of the phosphor at the end of the wavelength conversion member by another novel configuration has been searched for.
  • An object of the present disclosure is to provide a novel wavelength conversion member capable of suppressing a decrease in brightness at an end, a method for manufacturing the same, and a backlight unit and an image display device using the wavelength conversion member.
  • Means for solving the above problems include the following aspects.
  • ⁇ 3> The wavelength conversion member according to ⁇ 1> or ⁇ 2>, wherein the resin layer forms the outermost surface on the side surface of the wavelength conversion layer.
  • ⁇ 4> The wavelength conversion member according to any one of ⁇ 1> to ⁇ 3>, wherein the resin layer contains a poly (meth) acrylic acid ester.
  • the protective layer covers the outer peripheral surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer, ⁇ 1> to ⁇ 4. > The wavelength conversion member according to any one of the items.
  • ⁇ 6> A backlight unit including the wavelength conversion member according to any one of ⁇ 1> to ⁇ 5> and a light source.
  • ⁇ 7> An image display device including the backlight unit according to ⁇ 6>.
  • a metal oxide layer and a resin are formed on the side surfaces of a laminate having a wavelength conversion layer containing a phosphor and a coating material arranged on one main surface or both main surfaces of the wavelength conversion layer.
  • a method for manufacturing a wavelength conversion member which comprises a step of forming a protective layer including a layer.
  • the step of forming the protective layer includes a step of forming the metal oxide layer and a step of forming the resin layer in this order. Manufacturing method of parts.
  • ⁇ 11> The method for producing a wavelength conversion member according to any one of ⁇ 8> to ⁇ 10>, wherein the resin layer contains a poly (meth) acrylic acid ester.
  • ⁇ 12> The method for manufacturing a wavelength conversion member according to any one of ⁇ 8> to ⁇ 11>, wherein the protective layer is formed so as to cover the outer peripheral surface of the laminated body.
  • a novel wavelength conversion member capable of suppressing a decrease in brightness at an end portion and a method for manufacturing the same, and a backlight unit and an image display device using the wavelength conversion member are provided.
  • the term "process” includes not only a process independent of other processes but also the process if the purpose of the process is achieved even if the process cannot be clearly distinguished from the other process. ..
  • the numerical range indicated by using "-" in the present disclosure includes the numerical values before and after "-" as the minimum value and the maximum value, respectively.
  • the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described stepwise. ..
  • the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
  • each component may contain a plurality of applicable substances.
  • the content or content of each component is the total content or content of the plurality of substances present in the composition unless otherwise specified.
  • a plurality of types of particles corresponding to each component may be contained.
  • the particle size of each component means a value for a mixture of the plurality of particles present in the composition unless otherwise specified.
  • the term "layer” or “membrane” refers to only a part of the region, in addition to the case where the layer or the membrane is formed in the entire region when the region where the layer or the membrane exists is observed. The case where it is formed is also included.
  • the term “laminated” refers to stacking layers, and two or more layers may be bonded or the two or more layers may be removable.
  • “(meth) acryloyl” means at least one of acryloyl and methacrylic
  • (meth) acrylic means at least one of acrylic and methacrylic
  • (meth) acrylate means at least one of acrylate and methacrylate.
  • Means, "(meth) allyl” represents at least one of allyl and methacrylic.
  • the wavelength conversion member according to the embodiment of the present disclosure includes a wavelength conversion layer containing a phosphor, a coating material arranged on one main surface or both main surfaces of the wavelength conversion layer, and the wavelength conversion layer. It has a protective layer including a metal oxide layer and a resin layer, which is arranged on the side surface of the above.
  • the wavelength conversion member of the present embodiment since the side surface of the wavelength conversion layer is protected by the protective layer, it is possible to suppress a decrease in brightness at the end portion. Further, in one aspect, the wavelength conversion member of the present embodiment tends to be excellent in moisture and heat resistance.
  • each essential or optional member included in the wavelength conversion member will be described in detail.
  • the wavelength conversion layer contains a phosphor.
  • the wavelength conversion layer may further contain a cured resin product, or may have a phosphor contained (encapsulated) in the cured resin product. Further, the wavelength conversion layer may further contain a light diffusing material.
  • the wavelength conversion layer contains a phosphor that emits light when irradiated with light from a light source.
  • the type of phosphor is not particularly limited, and examples thereof include an organic phosphor and an inorganic phosphor.
  • the organic phosphor include a naphthalimide compound and a perylene compound.
  • the inorganic phosphor include Y 3 O 3 : Eu, YVO 4 : Eu, Y 2 O 2 : Eu, 3.5 MgO / 0.5 MgF 2 , GeO 2 : Mn, (Y ⁇ Cd) BO 2 : Eu, etc.
  • Red light emitting inorganic phosphor ZnS: Cu ⁇ Al, (Zn ⁇ Cd) S: Cu ⁇ Al, ZnS: Cu ⁇ Au ⁇ Al, Zn 2 SiO 4 : Mn, ZnSiO 4 : Mn, ZnS: Ag ⁇ Cu, ( Zn ⁇ Cd) S: Cu, ZnS: Cu, GdOS: Tb, LaOS: Tb, YSiO 4 : Ce ⁇ Tb, ZnGeO 4 : Mn, GeMgAlO: Tb, SrGaS: Eu 2+ , ZnS: Cu ⁇ Co, MgO ⁇ nB 2 O 3 : Green luminescent inorganic phosphors such as Ge ⁇ Tb, LaOBr: Tb ⁇ Tm, La 2 O 2 S: Tb, ZnS: Ag, GaWO 4 , Y 2 SiO 6 : Ce, ZnS: Ag ⁇ Ga ⁇ Cl , Ca 2 B 4
  • a quantum dot phosphor is preferable from the viewpoint of excellent color reproducibility of the image display device.
  • the quantum dot phosphor is not particularly limited, and examples thereof include particles containing at least one selected from the group consisting of a group II-VI compound, a group III-V compound, a group IV-VI compound, and a group IV compound.
  • the quantum dot phosphor preferably contains a compound containing at least one selected from the group consisting of Cd and In.
  • II-VI group compounds include CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSte, ZnSeS, ZnSeTe, ZnSte, HgSeS, ZnS.
  • Group III-V compounds include GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, COLP, PLGAs, VMwareSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb , AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNAs, GaInNAs, GaInNAs, GaInNAs, GaIn
  • the quantum dot phosphor may have a core-shell structure.
  • core / shell By making the band gap of the compound constituting the shell wider than the band gap of the compound constituting the core, it is possible to further improve the quantum efficiency of the quantum dot phosphor.
  • core / shell examples include CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS, and CdTe / ZnS.
  • the quantum dot phosphor may have a so-called core multi-shell structure in which the shell has a multi-layer structure.
  • the quantum efficiency of the quantum dot phosphor can be further improved. Is possible.
  • the wavelength conversion layer may contain one kind of quantum dot phosphor alone, or may contain two or more kinds of quantum dot phosphors in combination. May be good.
  • Examples of a mode in which two or more types of quantum dot phosphors are contained in combination include a mode in which two or more types of quantum dot phosphors having different components but the same average particle size are contained, and a mode in which components having different average particle sizes are contained. Examples thereof include an embodiment containing two or more types of quantum dot phosphors, and an embodiment containing two or more types of quantum dot phosphors having different components and average particle diameters.
  • the emission center wavelength of the quantum dot phosphor can be changed by changing at least one selected from the group consisting of the components of the quantum dot phosphor and the average particle size.
  • the wavelength conversion layer includes a quantum dot phosphor G having an emission center wavelength in the green wavelength region of 520 nm to 560 nm and a quantum dot phosphor R having an emission center wavelength in the red wavelength region of 600 nm to 680 nm. It may be contained.
  • the wavelength conversion layer containing the quantum dot phosphor G and the quantum dot phosphor R is irradiated with excitation light in the blue wavelength range of 430 nm to 480 nm, the quantum dot phosphor G and the quantum dot phosphor R are green, respectively. Light and red light are emitted. As a result, white light can be obtained by the green light and red light emitted from the quantum dot phosphor G and the quantum dot phosphor R and the blue light transmitted through the cured product.
  • the content of the phosphor in the wavelength conversion layer is preferably, for example, 0.01% by mass to 1.0% by mass, and 0.05% by mass to 0.5% by mass, based on the entire wavelength conversion layer. Is more preferable, and 0.1% by mass to 0.5% by mass is further preferable.
  • 0.01% by mass or more with respect to the entire wavelength conversion layer a sufficient wavelength conversion function tends to be obtained, and when the content of the phosphor is 0.01% by mass or less. , The aggregation of phosphors tends to be suppressed.
  • the wavelength conversion layer may further contain a cured resin product.
  • the wavelength conversion layer may be a layer in which the above-mentioned phosphor is contained in the cured resin product.
  • the cured resin product preferably contains a sulfide structure from the viewpoint of adhesion to other members (coating material, etc.) of the cured resin product and suppression of wrinkles due to volume shrinkage during curing.
  • the cured resin composition containing a sulfide structure is obtained by curing a resin composition containing, for example, a thiol compound described later and a polymerizable compound having a carbon-carbon double bond that causes an enthiol reaction with a thiol group of the thiol compound. Obtainable.
  • the cured resin product preferably contains an alicyclic structure or an aromatic ring structure.
  • the cured resin product having an alicyclic structure or an aromatic ring structure can be obtained, for example, by curing a resin composition containing a polymer compound having an alicyclic structure or an aromatic ring structure, which will be described later.
  • the cured resin product preferably contains an alkyleneoxy group.
  • the polarity of the cured resin product increases, and non-polar oxygen tends to be difficult to dissolve in the components in the cured product.
  • the flexibility of the cured resin product tends to increase and the adhesion to the coating material tends to improve.
  • the cured resin product containing an alkyleneoxy group can be obtained, for example, by curing a resin composition containing a polymerizable compound having an alkyleneoxy group, which will be described later.
  • the wavelength conversion layer may be a cured product of a composition containing a phosphor, a polymerizable compound, and a photopolymerization initiator (hereinafter, also simply referred to as a resin composition).
  • the resin composition may contain a phosphor, a thiol compound, at least one selected from the group consisting of a (meth) acrylic compound and a (meth) allyl compound, and a photopolymerization initiator.
  • the resin composition may optionally contain other components. Hereinafter, each component of the resin composition will be described in detail.
  • the resin composition contains a phosphor.
  • the details of the phosphor are as described above.
  • the quantum dot phosphor may be used in the state of a quantum dot phosphor dispersion liquid dispersed in a dispersion medium.
  • the dispersion medium for dispersing the quantum dot phosphor include various organic solvents, silicone compounds, and monofunctional (meth) acrylate compounds.
  • the quantum dots may be used in the state of a quantum dot phosphor dispersion liquid by using a dispersant, if necessary.
  • the organic solvent that can be used as the dispersion medium is not particularly limited as long as precipitation and aggregation of the quantum dot phosphor are not confirmed, and acetonitrile, methanol, ethanol, acetone, 1-propanol, ethyl acetate, butyl acetate, toluene, hexane and the like are not particularly limited. Can be mentioned.
  • Silicone compounds that can be used as a dispersion medium include straight silicone oils such as dimethyl silicone oil, methylphenyl silicone oil, and methylhydrogen silicone oil; amino-modified silicone oil, epoxy-modified silicone oil, carboxy-modified silicone oil, and carbinol-modified silicone. Oil, mercapto-modified silicone oil, heterogeneous functional group-modified silicone oil, polyether-modified silicone oil, methylstyryl-modified silicone oil, hydrophilic special-modified silicone oil, higher alkoxy-modified silicone oil, higher fatty acid-modified silicone oil, fluorine-modified silicone oil, etc. Modified silicone oil and the like.
  • the monofunctional (meth) acrylate compound that can be used as a dispersion medium is not particularly limited as long as it is liquid at 25 ° C., and a monofunctional (meth) acrylate compound having an alicyclic structure (preferably isobornyl (meth)). ) Acrylate and dicyclopentanyl (meth) acrylate), methoxypolyethylene glycol (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, ethoxylated o-phenylphenol (meth) acrylate and the like.
  • dispersant used as needed examples include polyether amine (trade name: JEFFAMINE (registered trademark) M-1000, HUNTSMAN), oleic acid and the like.
  • the mass-based ratio of the quantum dot phosphor to the quantum dot phosphor dispersion liquid is preferably 1% by mass to 20% by mass, and more preferably 1% by mass to 10% by mass.
  • the content of the quantum dot phosphor dispersion liquid in the resin composition is the total amount of the resin composition when the mass-based ratio of the quantum dot phosphor to the quantum dot phosphor dispersion liquid is 1% by mass to 20% by mass. On the other hand, for example, it is preferably 1% by mass to 10% by mass, more preferably 4% by mass to 10% by mass, and further preferably 4% by mass to 7% by mass.
  • the content of the quantum dot phosphor in the resin composition is preferably, for example, 0.01% by mass to 1.0% by mass, preferably 0.05% by mass or more, based on the total amount of the resin composition. It is more preferably 0.5% by mass, and further preferably 0.1% by mass to 0.5% by mass.
  • the content of the quantum dot phosphor is 0.01% by mass or more, sufficient emission intensity tends to be obtained when the cured product is irradiated with excitation light, and the content of the quantum dot phosphor is 1.0.
  • it is mass% or less the aggregation of the quantum dot phosphor tends to be suppressed.
  • the resin composition contains a polymerizable compound.
  • the polymerizable compound contained in the resin composition is not particularly limited, and examples thereof include a thiol compound, a (meth) acrylic compound, and a (meth) allyl compound.
  • the (meth) allyl compound means a compound having a (meth) allyl group in the molecule
  • the (meth) acrylic compound means a compound having a (meth) acryloyl group in the molecule.
  • Compounds having both a (meth) allyl group and a (meth) acryloyl group in the molecule shall be classified as (meth) allyl compounds for convenience.
  • the resin composition is selected from the group consisting of a thiol compound, a (meth) acrylic compound and a (meth) allyl compound as a polymerizable compound at least. 1 type and may be included.
  • a cured product obtained by curing a resin composition containing a thiol compound as a polymerizable compound and at least one selected from the group consisting of a (meth) acrylic compound and a (meth) allyl compound has a thiol group and ( A sulfide structure (RSR', R and R'represents an organic group) formed by an enthiol reaction with a carbon-carbon double bond of a (meth) acryloyl group or a (meth) allyl group.
  • RSR', R and R' represents an organic group formed by an enthiol reaction with a carbon-carbon double bond of a (meth) acryloyl group or a (meth) allyl group.
  • the thiol compound may be a monofunctional thiol compound having one thiol group in one molecule, or a polyfunctional thiol compound having two or more thiol groups in one molecule.
  • the thiol compound contained in the resin composition may be only one kind or two or more kinds.
  • the thiol compound may or may not have a polymerizable group other than the thiol group (for example, (meth) acryloyl group, (meth) allyl group) in the molecule.
  • a compound containing a thiol group and a polymerizable group other than the thiol group in the molecule shall be classified as a "thiol compound”.
  • the monofunctional thiol compound examples include hexanethiol, 1-heptanethiol, 1-octanethiol, 1-nonanthiol, 1-decanethiol, 3-mercaptopropionic acid, methyl mercaptopropionate, methoxybutyl mercaptopropionate, and the like.
  • Examples thereof include octyl mercaptopropionate, tridecyl mercaptopropionate, 2-ethylhexyl-3-mercaptopropionate, n-octyl-3-mercaptopropionate and the like.
  • polyfunctional thiol compound examples include ethylene glycol bis (3-mercaptopropionate), diethylene glycol bis (3-mercaptopropionate), tetraethylene glycol bis (3-mercaptopropionate), 1,2-.
  • the thiol compound preferably contains a polyfunctional thiol compound.
  • the ratio of the polyfunctional thiol compound to the total amount of the thiol compound is, for example, preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably 100% by mass.
  • the thiol compound may be in the state of a thioether oligomer that has reacted with the (meth) acrylic compound.
  • the thioether oligomer can be obtained by addition polymerization of a thiol compound and a (meth) acrylic compound in the presence of a polymerization initiator.
  • the content of the thiol compound in the resin composition is preferably, for example, 5% by mass to 80% by mass, and 15% by mass, based on the total amount of the resin composition. It is more preferably to 70% by mass, and further preferably 20% by mass to 60% by mass.
  • the content of the thiol compound is 5% by mass or more with respect to the total amount of the resin composition, the adhesion of the wavelength conversion layer to the coating material tends to be further improved, and the content of the thiol compound is the resin composition.
  • it is 80% by mass or less with respect to the total amount, the heat resistance and the moist heat resistance of the wavelength conversion layer tend to be further improved.
  • the (meth) acrylic compound may be a monofunctional (meth) acrylic compound having one (meth) acryloyl group in one molecule, and two or more (meth) acrylic compounds in one molecule. It may be a polyfunctional (meth) acrylic compound having an acryloyl group.
  • the (meth) acrylic compound contained in the resin composition may be one kind or two or more kinds.
  • the monofunctional (meth) acrylic compound examples include (meth) acrylic acid; methyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and isononyl (meth).
  • Alkyl (meth) acrylate having an alkyl group having 1 to 18 carbon atoms such as acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, and stearyl (meth) acrylate; benzyl (meth) acrylate, phenoxyethyl ( A (meth) acrylate compound having an aromatic ring such as a meta) acrylate; an alkoxyalkyl (meth) acrylate such as butoxyethyl (meth) acrylate; an aminoalkyl (meth) acrylate such as N, N-dimethylaminoethyl (meth) acrylate; Diethylene glycol monoethyl ether (meth) acrylate, triethylene glycol monobutyl ether (meth) acrylate, tetraethylene glycol monomethyl ether (meth) acrylate, hexaethylene glycol monomethyl ether (meth) acrylate
  • Acrylate Polyalkylene glycol monoaryl ether (meth) acrylate such as hexaethylene glycol monophenyl ether (meth) acrylate; cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, isobornyl (meth) acrylate, methylene oxide-added cyclo (Meta) acrylate compound having an alicyclic structure such as decatorien (meth) acrylate; (meth) acrylate compound having a heterocycle such as (meth) acryloylmorpholine and tetrahydrofurfuryl (meth) acrylate; heptadecafluorodecyl (meth) ) Alkyl fluoride (meth) acrylates such as acrylates; 2-hydroxyethyl (meth) acrylates, 3-hydroxypropyl (meth) acrylates, 4-hydroxybutyl (meth) acrylates, trietylene N
  • N-Isopropyl (meth) acrylamide N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylamide and other (meth) acrylamide compounds; Be done.
  • polyfunctional (meth) acrylic compound examples include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonanediol di (meth) acrylate.
  • Polyalkylene glycol di (meth) acrylate Polyalkylene glycol di (meth) acrylate such as polyethylene glycol di (meth) acrylate and polypropylene glycol di (meth) acrylate; Trimethylol propantri (meth) acrylate, Trimethylol propantri with ethylene oxide (meth) Tri (meth) acrylate compounds such as meth) acrylate and tris (2-acryloyloxyethyl) isocyanurate; ethylene oxide-added pentaerythritol tetra (meth) acrylate, trimethylolpropanetetra (meth) acrylate, pentaerythritol tetra (meth) acrylate and the like.
  • Tetra (meth) acrylate compounds tricyclodecanedimethanol di (meth) acrylate, cyclohexanedimethanol di (meth) acrylate, 1,3-adamantan dimethanol di (meth) acrylate, hydrogenated bisphenol A (poly) ethoxydi ( Meta) acrylate, hydrogenated bisphenol A (poly) propoxydi (meth) acrylate, hydrogenated bisphenol F (poly) ethoxydi (meth) acrylate, hydrogenated bisphenol F (poly) propoxydi (meth) acrylate, hydrogenated bisphenol S (poly) Examples thereof include (meth) acrylate compounds having an alicyclic structure such as ethoxydi (meth) acrylate and hydrogenated bisphenol S (poly) propoxydi (meth) acrylate.
  • the (meth) acrylic compound is preferably a (meth) acrylate compound having an alicyclic structure or an aromatic ring structure from the viewpoint of further improving the heat resistance and moisture heat resistance of the cured product.
  • the alicyclic structure or aromatic ring structure include an isobornyl skeleton, a tricyclodecane skeleton, and a bisphenol skeleton.
  • the (meth) acrylic compound may have an alkyleneoxy group or may be a bifunctional (meth) acrylic compound having an alkyleneoxy group.
  • alkyleneoxy group for example, an alkyleneoxy group having 2 to 4 carbon atoms is preferable, an alkyleneoxy group having 2 or 3 carbon atoms is more preferable, and an alkyleneoxy group having 2 carbon atoms is further preferable.
  • the alkyleneoxy group contained in the (meth) acrylic compound may be one type or two or more types.
  • the alkyleneoxy group-containing compound may be a polyalkyleneoxy group-containing compound having a polyalkyleneoxy group containing a plurality of alkyleneoxy groups.
  • the number of alkyleneoxy groups in one molecule is preferably 2 to 30, more preferably 2 to 20, and 3 to 20. It is more preferably 10 pieces, and particularly preferably 3 to 5 pieces.
  • the (meth) acrylic compound has an alkyleneoxy group
  • it preferably has a bisphenol structure.
  • the heat resistance of the cured product tends to be more excellent.
  • the bisphenol structure include a bisphenol A structure and a bisphenol F structure, and among them, the bisphenol A structure is preferable.
  • (meth) acrylic compound having an alkyleneoxy group examples include alkoxyalkyl (meth) acrylates such as butoxyethyl (meth) acrylates; diethylene glycol monoethyl ether (meth) acrylates, triethylene glycol monobutyl ether (meth) acrylates, and the like.
  • Examples thereof include bisphenol type di (meth) acrylate compounds such as ethoxylated bisphenol A type di (meth) acrylate, propoxylated bisphenol A type di (meth) acrylate, and propoxylated ethoxylated bisphenol A type di (meth) acrylate; ..
  • the alkyleneoxy group-containing compound ethoxylated bisphenol A type di (meth) acrylate, propoxylated bisphenol A type di (meth) acrylate and propoxylated ethoxylated bisphenol A type di (meth) acrylate are preferable, and ethoxylated bisphenol A-type di (meth) acrylate is more preferable.
  • the content of the (meth) acrylic compound in the resin composition is, for example, 40% by mass to 90% by mass with respect to the total amount of the resin composition. It may be 50% by mass to 80% by mass.
  • the (meth) allyl compound may be a monofunctional (meth) allyl compound having one (meth) allyl group in one molecule, and two or more (meth) allyl compounds in one molecule. It may be a polyfunctional (meth) allyl compound having an allyl group.
  • the (meth) allyl compound contained in the resin composition may be only one kind or two or more kinds.
  • the (meth) allyl compound may or may not have a polymerizable group (for example, (meth) acryloyl group) other than the (meth) allyl group in the molecule.
  • a polymerizable group for example, (meth) acryloyl group
  • compounds having a polymerizable group other than the (meth) allyl group in the molecule shall be classified as "(meth) allyl compound”.
  • the monofunctional (meth) allyl compound examples include (meth) allyl acetate, (meth) allyl n-propionate, (meth) allyl benzoate, (meth) allyl phenyl acetate, (meth) allyl phenoxy acetate, and (meth). Examples thereof include allyl methyl ether and (meth) allyl glycidyl ether.
  • polyfunctional (meth) allyl compound examples include di (meth) allyl benzenedicarboxylate, di (meth) allyl cyclohexanedicarboxylate, di (meth) allylmaleate, di (meth) allyl adipate, and di (meth).
  • Examples of the (meth) allyl compound include compounds having an isocyanurate skeleton such as tri (meth) allyl isocyanurate, tri (meth) allyl cyanurate, and benzenedicarboxylic acid di (meth) from the viewpoint of heat resistance and moisture heat resistance of the cured product.
  • At least one selected from the group consisting of allyl and di (meth) allyl cyclohexanedicarboxylic acid is preferable, a compound having an isocyanurate skeleton is more preferable, and tri (meth) allyl isocyanurate is further preferable.
  • the content of the (meth) allyl compound in the resin composition is, for example, 10% by mass to 50% by mass with respect to the total amount of the resin composition. It may be 15% by mass to 45% by mass.
  • the polymerizable compound may include a thioether oligomer as a thiol compound and a (meth) allyl compound (preferably a polyfunctional (meth) allyl compound).
  • the quantum dot phosphor is a dispersion liquid dispersed in a silicone compound as a dispersion medium. It is preferably in a state.
  • the polymerizable compound is a thiol compound that is not in the form of a thioether oligomer, and a (meth) acrylic compound (preferably a polyfunctional (meth) acrylic compound, more preferably a bifunctional (meth) acrylic compound). May be included.
  • the polymerizable compound contains a thiol compound that is not in the state of a thioether oligomer and a (meth) acrylic compound and a quantum dot phosphor is used as the phosphor
  • the quantum dot phosphor is used as the dispersion medium (meth). It is preferably in the state of a dispersion liquid dispersed in an acrylic compound, preferably a monofunctional (meth) acrylic compound, and more preferably isobornyl (meth) acrylate.
  • the type of photopolymerization initiator contained in the resin composition is not particularly limited, and examples thereof include compounds that generate radicals when irradiated with active energy rays such as ultraviolet rays.
  • the photopolymerization initiator include benzophenone, N, N'-tetraalkyl-4,4'-diaminobenzophenone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, 2-Methyl-1- [4- (methylthio) phenyl] -2-morpholino-propanone-1, 4,4'-bis (dimethylamino) benzophenone (also referred to as "Michler ketone”), 4,4'-bis (Diethylamino) benzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 1-hydroxycyclohexylphenylketone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- (4- (4-) Aromatic ketone compounds such as (2-hydroxyethoxy) -phenyl) -2-hydroxy-2-methyl-1-propane-1-one,
  • At least one selected from the group consisting of an acylphosphine oxide compound, an aromatic ketone compound, and an oxime ester compound is preferable from the viewpoint of curability, and from the acylphosphine oxide compound and the aromatic ketone compound. At least one selected from the above group is more preferable, and an acylphosphine oxide compound is further preferable.
  • the content of the photopolymerization initiator in the resin composition is preferably, for example, 0.1% by mass to 5% by mass, preferably 0.1% by mass to 3% by mass, based on the total amount of the resin composition. It is more preferably 0.1% by mass to 1.5% by mass.
  • the content of the photopolymerization initiator is 0.1% by mass or more, the sensitivity of the resin composition tends to be sufficient, and when the content of the photopolymerization initiator is 5% by mass or less, the resin The influence on the hue of the composition and the decrease in storage stability tend to be suppressed.
  • the resin composition may further contain a light diffusing material.
  • the light diffusing material include titanium oxide, barium sulfate, zinc oxide, calcium carbonate and the like.
  • titanium oxide is preferable from the viewpoint of light scattering efficiency.
  • the titanium oxide may be rutile-type titanium oxide or anatase-type titanium oxide, and is preferably rutile-type titanium oxide.
  • the average particle size of the light diffusing material is preferably 0.1 ⁇ m to 1 ⁇ m, more preferably 0.2 ⁇ m to 0.8 ⁇ m, and even more preferably 0.2 ⁇ m to 0.5 ⁇ m.
  • the average particle size of the light diffusing material can be measured as follows. When the light diffusing material is contained in the resin composition, the extracted light diffusing material is dispersed in purified water containing a surfactant to obtain a dispersion liquid.
  • the value when the integration from the small diameter side is 50% ( The median diameter (D50)) is defined as the average particle size of the light diffusing material.
  • the resin composition can be obtained by diluting the resin composition with a liquid medium, precipitating the light diffusing material by centrifugation or the like, and distributing the light diffusing material.
  • the average particle size of the light diffusing material in the cured product obtained by curing the resin composition containing the light diffusing material is the equivalent circle diameter (major axis) of 50 particles by observing the particles using a scanning electron microscope.
  • the geometric mean of the minor axis) can be calculated and calculated as the arithmetic mean value.
  • the light diffusing material preferably has an organic substance layer containing an organic substance on at least a part of the surface thereof.
  • the organic substances contained in the organic substance layer include organic silane, organosiloxane, fluorosilane, organic phosphonate, organic phosphoric acid compound, organic phosphinate, organic sulfonic acid compound, carboxylic acid, carboxylic acid ester, carboxylic acid derivative, amide, and hydrocarbon.
  • the organic substance contained in the organic substance layer preferably contains a polyol, an organic silane, and the like, and more preferably contains at least one selected from the group consisting of the polyol and the organic silane.
  • organic silanes include octyltriethoxysilane, nonyltriethoxysilane, decyltriethoxysilane, dodecyltriethoxysilane, tridecyltriethoxysilane, tetradecyltriethoxysilane, pentadecyltriethoxysilane, and hexadecyltriethoxysilane.
  • Examples thereof include silane, heptadecyltriethoxysilane, and octadecyltriethoxysilane.
  • organosiloxane examples include polydimethylsiloxane (PDMS) terminated with a trimethylsilyl group, polymethylhydrosiloxane (PMHS), polysiloxane induced by functionalization of PMHS with an olefin (by hydrosilylation), and the like.
  • organic phosphonates include n-octylphosphonic acid and its ester, n-decylphosphonic acid and its ester, 2-ethylhexylphosphonic acid and its ester, and camphyl phosphonic acid and its ester.
  • organic phosphoric acid compound examples include organic acidic phosphate, organic pyrophosphate, organic polyphosphate, organic metaphosphate, salts thereof and the like.
  • organic phosphinate examples include n-hexylphosphinic acid and its ester, n-octylphosphinic acid and its ester, di-n-hexylphosphinic acid and its ester, and di-n-octylphosphinic acid and its ester. Can be mentioned.
  • organic sulfonic acid compound examples include alkyl sulfonic acids such as hexyl sulfonic acid, octyl sulfonic acid, and 2-ethylhexyl sulfonic acid, these alkyl sulfonic acids, metal ions such as sodium, calcium, magnesium, aluminum, and titanium, and ammonium. Examples thereof include salts with ions and organic ammonium ions such as triethanolamine.
  • carboxylic acid include maleic acid, malonic acid, fumaric acid, benzoic acid, phthalic acid, stearic acid, oleic acid, linoleic acid and the like.
  • carboxylic acid ester examples include the above carboxylic acid, ethylene glycol, propylene glycol, trimethylolpropane, diethanolamine, triethanolamine, glycerol, hexanetriol, erythritol, mannitol, sorbitol, pentaerythritol, bisphenol A, hydroquinone, and flo.
  • Specific examples of the amide include stearic acid amide, oleic acid amide, and erucic acid amide.
  • polyolefin and its copolymer examples include a copolymer of polyethylene, polypropylene, ethylene and one or more compounds selected from propylene, butylene, vinyl acetate, acrylate, acrylamide and the like. ..
  • polyol examples include glycerol, trimethylolethane, trimethylolpropane and the like.
  • alkanolamine examples include diethanolamine and triethanolamine.
  • organic dispersant include high molecular weight organic dispersants having functional groups such as citric acid, polyacrylic acid, polymethacrylic acid, anionic, cationic, zwitterionic, and nonionic.
  • the light diffusing material may have a metal oxide layer containing a metal oxide on at least a part of the surface thereof.
  • the metal oxide contained in the metal oxide layer include silicon dioxide, aluminum oxide, zirconia, phosphoria, and boria.
  • the metal oxide layer may be one layer or two or more layers.
  • the light diffusing material has two metal oxide layers, it preferably contains a first metal oxide layer containing silicon dioxide and a second metal oxide layer containing aluminum oxide.
  • the light diffusing material has a metal oxide layer, the dispersibility of the light diffusing material in the cured product tends to be improved.
  • the metal oxide layer and the organic material layer are provided on the surface of the light diffusing material in the order of the metal oxide layer and the organic material layer.
  • the light diffusing material has an organic material layer and two metal oxide layers, a first metal oxide layer containing silicon dioxide and a second metal oxide layer containing aluminum oxide are formed on the surface of the light diffusing material. It is preferable that the organic material layer is provided in the order of the first metal oxide layer, the second metal oxide layer, and the organic material layer (the organic material layer is the outermost layer).
  • the content of the light diffusing material in the wavelength conversion layer formed by curing the resin composition is, for example, 0.1% by mass with respect to the total amount of the wavelength conversion layer. It is preferably ⁇ 1.0% by mass, more preferably 0.2% by mass to 1.0% by mass, and even more preferably 0.3% by mass to 1.0% by mass.
  • the resin composition may further contain a liquid medium.
  • the liquid medium means a medium in a liquid state at 25 ° C.
  • liquid medium examples include acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isopropyl ketone, methyl-n-butyl ketone, methyl isobutyl ketone, methyl-n-pentyl ketone, methyl-n-hexyl ketone, diethyl ketone, and the like.
  • Ketone solvents such as dipropyl ketone, diisobutyl ketone, trimethylnonanone, cyclohexanone, cyclopentanone, methylcyclohexanone, 2,4-pentandione, acetonylacetone; diethyl ether, methyl ethyl ether, methyl-n-propyl ether, diisopropyl Ether, tetrahydrofuran, methyl tetrahydrofuran, dioxane, dimethyl dioxane, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol di-n-propyl ether, ethylene glycol di-n-butyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, Diethylene glycol methyl-n-propyl ether, diethylene glycol methyl-n-butyl ether
  • Solvents methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, t-butanol, n-pentanol, isopentanol, 2-methylbutanol, sec-pentanol, t-pentanol , 3-methoxybutanol, n-hexanol, 2-methylpentanol, sec-hexanol, 2-ethylbutanol, sec-heptanol, n-octanol, 2-ethylhexanol, sec-octanol, n-nonyl alcohol, n-decanol , Se-undecyl alcohol, trimethylnonyl alcohol, sec-tetradecyl alcohol, sec-heptadecyl alcohol, cyclohexanol, methylcyclohexanol,
  • Diethylene glycol mono-n-hexyl ether Diethylene glycol mono-n-hexyl ether, triethylene glycol monoethyl ether, tetraethylene glycol mono-n-butyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, tripropylene glycol monomethyl ether, etc.
  • Glycol monoether solvent such as terpene solvent such as terpinene, terpineol, milsen, aloosimene, limonene, dipentene, pinene, carboxylic, ossimen, ferlandrene; straight silicone oil such as dimethyl silicone oil, methylphenyl silicone oil, methylhydrogen silicone oil; Amino-modified silicone oil, epoxy-modified silicone oil, cal Boxy-modified silicone oil, carbinol-modified silicone oil, mercapto-modified silicone oil, heterologous functional group-modified silicone oil, polyether-modified silicone oil, methylstyryl-modified silicone oil, hydrophilic special-modified silicone oil, higher alkoxy-modified silicone oil, higher fatty acid Modified silicone oils such as modified silicone oils and fluorine-modified silicone oils; butanoic acid, pentanoic acid, hexanoic acid, heptanic acid, octanoic acid,
  • the content of the liquid medium in the resin composition is preferably, for example, 1% by mass to 10% by mass, and 4% by mass, based on the total amount of the resin composition. It is more preferably from 10% by mass to 10% by mass, and even more preferably from 4% by mass to 7% by mass.
  • the resin composition may further contain components other than the above-mentioned components.
  • the resin composition may further contain components such as a polymerization inhibitor, a silane coupling agent, a surfactant, an adhesion imparting agent, an antioxidant, and a light stabilizer.
  • a polymerization inhibitor such as a silane coupling agent, a surfactant, an adhesion imparting agent, an antioxidant, and a light stabilizer.
  • the resin composition can be prepared by mixing a phosphor, a polymerizable compound, a photopolymerization initiator, and if necessary, other components by a conventional method.
  • the wavelength conversion layer may be one obtained by curing one kind of resin composition, or may be one obtained by curing two or more kinds of resin compositions.
  • the wavelength conversion layer has different emission characteristics from the first cured product layer obtained by curing the resin composition containing the first phosphor and the first phosphor.
  • a second cured product layer obtained by curing the resin composition containing the second phosphor may be laminated.
  • the average thickness of the wavelength conversion layer is not particularly limited, and is preferably, for example, 50 ⁇ m to 200 ⁇ m, more preferably 50 ⁇ m to 150 ⁇ m, and even more preferably 80 ⁇ m to 120 ⁇ m.
  • the average thickness of the wavelength conversion layer is 50 ⁇ m or more, the wavelength conversion efficiency tends to be further improved, and when the average thickness of the wavelength conversion layer is 200 ⁇ m or less, when the wavelength conversion member is applied to the backlight unit described later. In addition, there is a tendency that the backlight unit can be made thinner.
  • the average thickness of the wavelength conversion layer is obtained as, for example, an arithmetic mean value of the thicknesses of any three points measured using a micrometer.
  • the wavelength conversion layer can be obtained, for example, by forming a coating film, a molded product, or the like of a resin composition, performing a drying treatment as necessary, and then irradiating with active energy rays such as ultraviolet rays.
  • the wavelength and irradiation amount of the active energy rays can be appropriately set according to the composition of the resin composition. In one aspect, it is irradiated with ultraviolet rays having a wavelength of 280 nm ⁇ 400 nm at an irradiation amount of 100mJ / cm 2 ⁇ 5000mJ / cm 2.
  • Examples of the ultraviolet source include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, carbon arc lamps, metal halide lamps, xenon lamps, chemical lamps, black light lamps, microwave-excited mercury lamps, and the like.
  • the coating material is arranged on one main surface of the wavelength conversion layer or on both main surfaces.
  • the "main surface” of the wavelength conversion layer represents two facing surfaces having the largest area of the wavelength conversion layer.
  • the “side surface” of the wavelength conversion layer represents a surface other than the main surface of the wavelength conversion layer. The same applies to layers other than the wavelength conversion layer included in the wavelength conversion member.
  • the “main surface” and the “side surface” may be flat or have a curved surface.
  • the covering material is preferably placed on both main surfaces of the wavelength conversion layer.
  • the material of the covering material is not particularly limited, and polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN); polyolefin such as polyethylene (PE) and polypropylene (PP); polyamide such as nylon; ethylene-vinyl alcohol co-weight. It may be coalescence (EVOH) or the like. From the viewpoint of availability, the material of the coating material is preferably at least one selected from the group consisting of polyethylene terephthalate and polypropylene.
  • the coating material preferably has a barrier property against at least one selected from the group consisting of oxygen and water, and more preferably has a barrier property against both oxygen and water, from the viewpoint of suppressing a decrease in the luminous efficiency of the phosphor. preferable.
  • the coating material having a barrier property against at least one selected from the group consisting of oxygen and water is not particularly limited, and examples thereof include a barrier film having a base material layer and an inorganic layer.
  • the base material layer include a base material layer formed from the above-mentioned materials.
  • Examples of the inorganic substance forming the inorganic layer include silica and alumina.
  • the method for producing the barrier film having the base material layer and the inorganic layer is not particularly limited, and examples thereof include a method of depositing an inorganic substance on one side or both sides of the base material layer.
  • the coating material is a barrier film having a base material layer and an inorganic layer
  • the method of arranging the coating material and the wavelength conversion layer in the wavelength conversion member is not particularly limited, and the inorganic layer is arranged so as to face the wavelength conversion member. Is preferable. That is, it is preferable that the inorganic layer is arranged between the base material layer and the wavelength conversion layer. As a result, the barrier function tends to be suitably exhibited.
  • Oxygen permeability of the dressing is preferably 1.0mL / (m 2 ⁇ 24h ⁇ atm) or less, more preferably 0.8mL / (m 2 ⁇ 24h ⁇ atm) or less, 0 and more preferably .6mL / (m 2 ⁇ 24h ⁇ atm) or less.
  • the oxygen permeability of the coating material can be measured using an oxygen permeability measuring device (for example, MOCON, OX-TRAN) under the conditions of a temperature of 23 ° C. and a relative humidity of 90%.
  • the water vapor permeability of the dressing for example, more that that 1 ⁇ 10 is 0 g / (m 2 ⁇ 24h ) or less preferably, 8 ⁇ 10 -1 g / ( m 2 ⁇ 24h) or less preferably, and more preferably 6 ⁇ 10 -1 g / (m 2 ⁇ 24h) or less.
  • the water vapor permeability of the coating material can be measured using a water vapor permeability measuring device (for example, MOCON, AQUATRAN) under the conditions of a temperature of 40 ° C. and a relative humidity of 100%.
  • the covering material is preferably in the form of a sheet.
  • the average thickness of the covering material is, for example, preferably 10 ⁇ m to 200 ⁇ m, more preferably 12 ⁇ m to 170 ⁇ m, and even more preferably 15 ⁇ m to 150 ⁇ m.
  • the average thickness of the covering material is obtained as, for example, an arithmetic mean value of the thicknesses of any three points measured using a micrometer.
  • the protective layer includes a metal oxide layer and a resin layer, and is arranged on the side surface of the wavelength conversion layer. Since the metal oxide is denser than the metal and is chemically stable, it is possible to satisfactorily exert the effect of suppressing the decrease in brightness at the end portion. Further, when the protective layer contains the resin layer, the decrease in brightness at the end portion of the wavelength conversion member tends to be suppressed more satisfactorily. The reason for this is not always clear, but the introduction of the resin layer alleviates the difference in the coefficient of thermal expansion between the protective layer and the wavelength conversion layer, and the expansion or contraction of the wavelength conversion member with temperature changes causes the barrier property of the metal oxide layer. It is presumed that this is because the decrease in is suppressed.
  • metal oxide contained in the metal oxide layer examples include silica, alumina, niobium oxide, cerium oxide, and titanium oxide.
  • One type of metal oxide may be used alone, or two or more types may be used in combination. Of these, it is preferable to use silica and alumina together.
  • Examples of the resin forming the resin layer include acrylic resin, urethane resin, thiol resin, fluorine resin and the like, and among them, acrylic resin is preferable.
  • examples of the acrylic resin include poly (meth) acrylic acid ester and a copolymer of (meth) acrylic acid ester and other components.
  • examples of the acrylic resin include polymethylmethacrylate (PMMA).
  • PMMA polymethylmethacrylate
  • the protective layer may be, for example, a protective layer formed by forming a metal oxide layer on a base material which is a resin layer.
  • the method for forming the metal oxide is not particularly limited, and examples thereof include an atomic layer deposition method, sputtering, a chemical vapor deposition method (CVD), a physical vapor deposition method (PVD), and a molecular beam epitaxy method (MBE).
  • CVD chemical vapor deposition method
  • PVD physical vapor deposition method
  • MBE molecular beam epitaxy method
  • the room temperature atomic layer deposition method is useful. According to the room temperature atomic layer deposition method, it is possible to better suppress the decrease in brightness at the end without deteriorating the phosphor due to heat.
  • the protective layer may include a layer other than the metal oxide layer and the resin layer.
  • the protective layer includes a metal oxide layer and a resin layer, and the metal oxide layer and the resin layer are adjacent to each other. Is preferable.
  • the protective layer may be composed of a metal oxide layer and a resin layer (that is, includes only the metal oxide and the resin layer) and may not include other layers.
  • the protective layer may be arranged on at least a part of the side surface of the wavelength conversion layer, may be arranged on the entire side surface of the wavelength conversion layer, or may be further arranged on the side surface of the wavelength conversion layer.
  • the protective layer may be arranged on a part or the whole of the side surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer.
  • the protective layer may cover the outer peripheral surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer.
  • the outer peripheral surface of the layered member represents a surface including the main surface and the side surface of the layered member.
  • the metal oxide layer contained in the protective layer covers the outer peripheral surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer.
  • the outer peripheral surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer coated on the resin layer may be coated.
  • the metal oxide layer may be arranged outside the resin layer on the side surface of the wavelength conversion layer. Therefore, on the side surface of the wavelength conversion layer, the resin layer and the metal oxide layer may be arranged in this order from the wavelength conversion layer side. On the contrary, on the side surface of the wavelength conversion layer, the resin layer may be arranged outside the metal oxide layer. Therefore, on the side surface of the wavelength conversion layer, the metal oxide layer and the resin layer may be arranged in this order from the wavelength conversion layer side.
  • the metal oxide layer may form the outermost layer or the resin layer may form the outermost surface on the side surface of the wavelength conversion layer.
  • the average thickness of the protective layer is not particularly limited.
  • the average thickness of the protective layer is preferably 5 nm to 500 nm, more preferably 10 nm to 300 nm, further preferably 20 nm to 100 nm, and particularly preferably 30 nm to 90 nm.
  • the average thickness of the protective layer is 5 nm or more, the decrease in brightness tends to be suppressed more satisfactorily.
  • the average thickness of the protective layer is 500 nm or less, the manufacturing cost tends to be suppressed.
  • the thickness of the metal oxide layer in the protective layer (when the metal oxide layer contains a plurality of metal oxides, the total thickness of the metal oxide layers formed by the plurality of metal oxides) is 0. It is preferably 1 nm to 100 nm, more preferably 0.5 nm to 50 nm, and even more preferably 1 nm to 40 nm.
  • the thickness of the metal oxide layer is 0.1 nm or more, sufficient barrier properties tend to be obtained, and when the thickness of the metal oxide layer is 100 nm or less, the production cost tends to be suppressed.
  • the silica layer when the protective layer contains a silica layer and an alumina layer, is preferably 0.1 nm to 40 nm, more preferably 0.2 nm to 30 nm, and further preferably 0.3 nm to 20 nm.
  • An alumina layer of preferably 0.1 nm to 40 nm, more preferably 0.2 nm to 30 nm, still more preferably 0.3 nm to 20 nm may be contained.
  • the thickness of the resin layer is preferably 4.9 nm to 499.9 nm, more preferably 9.5 nm to 299.5 nm, further preferably 19 nm to 199.5 nm, and 30 nm to 100 nm. Is particularly preferred.
  • the average thickness of the protective layer and the average thickness of each layer in the protective layer are obtained as the arithmetic mean value of the thicknesses of any three points measured by energy dispersive X-ray analysis.
  • wavelength conversion member having the protective layer will be described with reference to the drawings, but the wavelength conversion member according to the present embodiment is not limited to the mode shown in the drawings.
  • a protective layer 15 including a metal oxide layer 13 and a resin layer 14 is arranged on a side surface of a laminate in which coating materials 12A and 12B are arranged on both main surfaces of the wavelength conversion layer 11.
  • An example of the wavelength conversion member 10 is shown.
  • the metal oxide layer 13 is arranged inside and the resin layer 14 is arranged outside, but the resin layer 14 is arranged inside and the metal oxide layer 13 is arranged outside. You may.
  • the former configuration in which the metal oxide layer 13 is arranged inside and the resin layer 14 is arranged outside is adopted, there is a tendency that the decrease in brightness at the end portion of the wavelength conversion member 10 can be suppressed more satisfactorily.
  • the metal oxide layer 13 is suitably protected by the resin layer and the physical or chemical deterioration of the metal oxide is suitably suppressed.
  • the resin layer 14 is arranged inside and the metal oxide layer 13 is arranged outside
  • the moisture and heat resistance tends to be further improved.
  • the reason for this is not clear, since the resin layer 14 is arranged inside, the strain in a high temperature environment due to the difference in the coefficient of linear expansion between the metal oxide layer 13 and the wavelength conversion member 10 can be relaxed. It is presumed that this is because the deterioration of the metal oxide layer 13 is suppressed.
  • the outer peripheral surface of the laminate in which the coating materials 12A and 12B are arranged on both main surfaces of the wavelength conversion layer 11 is covered with the protective layer 15 including the metal oxide layer 13 and the resin layer 14.
  • An example of a wavelength conversion member is shown.
  • the metal oxide layer 13 is arranged inside and the resin layer 14 is arranged outside, but the resin layer 14 is arranged inside and the metal oxide layer 13 is arranged outside. You may.
  • the former configuration in which the metal oxide layer 13 is arranged inside and the resin layer 14 is arranged outside is adopted, there is a tendency that the decrease in brightness at the end portion can be suppressed more satisfactorily.
  • the metal oxide layer 13 is suitably protected by the resin layer and the physical or chemical deterioration of the metal oxide is suitably suppressed.
  • the moisture and heat resistance tends to be further improved.
  • the resin layer 14 is arranged inside, the strain in a high temperature environment due to the difference in the coefficient of linear expansion between the metal oxide layer 13 and the wavelength conversion member 10 can be relaxed. It is presumed that this is because the deterioration of the metal oxide layer 13 is suppressed.
  • the metal oxide layer is formed by the atomic layer deposition method, as shown in FIG. 2, it is possible to relatively easily form a structure in which the outer peripheral surface of the laminate is covered with the metal oxide layer 13. ..
  • the types and average thicknesses of the coating material 12A and the coating material 12B may be the same or different, respectively.
  • a wavelength conversion layer containing a phosphor and a coating material arranged on one main surface or both main surfaces of the wavelength conversion layer are provided.
  • a step of forming a protective layer including a metal oxide layer and a resin layer on the side surface of the laminated body is included. The above-mentioned contents can be applied to the details of the wavelength conversion member.
  • the step of forming the protective layer may include a step of forming the metal oxide layer and a step of forming the resin layer in any order.
  • the step of forming the protective layer may include a step of forming the metal oxide layer and a step of forming the resin layer in this order.
  • the metal oxide layer formed so as to cover the outer peripheral surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer? Or, it may be formed so as to cover the outer peripheral surface of the laminate in which the coating material is arranged on one main surface or both main surfaces of the wavelength conversion layer coated on the resin layer. .. In a further aspect, the protective layer may be formed to cover the outer peripheral surface of the laminate.
  • the wavelength conversion member of this embodiment can be manufactured by, for example, the following manufacturing method.
  • first coating material a film-like coating material
  • the method of applying the resin composition is not particularly limited, and examples thereof include a die coating method, a curtain coating method, an extrusion coating method, a rod coating method, and a roll coating method.
  • a film-like coating material (hereinafter, also referred to as “second coating material”) that is continuously conveyed is attached onto the coating film of the resin composition.
  • the coating film is cured and a cured product layer is formed by irradiating the active energy rays from the side of the first coating material and the second coating material that can transmit the active energy rays. If neither the first coating material nor the second coating material can transmit the active energy rays, the coating film is irradiated with the active energy rays before the second coating material is bonded, and the cured product layer is formed. May be formed. Then, by cutting out to a desired size, a laminate of the first coating material, the cured product layer, and the second coating material can be produced.
  • a protective layer including a metal oxide layer and a resin layer is formed on the side surface of the laminate produced as described above.
  • the method of forming the protective layer is not particularly limited.
  • a metal oxide layer is formed on the side surface or the outer peripheral surface of the laminate, and then a resin composition for forming a resin layer is applied to the outer peripheral surface of the metal oxide layer, and the resin composition is dried or cured as necessary.
  • the resin layer may be formed by this. Further, the resin layer may be formed on the side surface or the outer peripheral surface of the laminate first, and then the metal oxide layer may be coated on the outer peripheral surface of the resin layer.
  • Examples of the method for forming the metal oxide layer include an atomic layer deposition method, sputtering, a chemical vapor deposition method (CVD), a physical vapor deposition method (PVD), and a molecular beam epitaxy method (MBE).
  • Examples of the method for applying the resin composition for forming the resin layer include the methods exemplified as the above-mentioned method for applying the resin composition for forming the wavelength conversion layer.
  • the backlight unit includes the above-mentioned wavelength conversion member and a light source.
  • the backlight unit is preferably a multi-wavelength light source from the viewpoint of improving color reproducibility.
  • blue light having an emission center wavelength in the wavelength range of 430 nm to 480 nm and having an emission intensity peak having a half-value width of 100 nm or less, and emission center wavelength in the wavelength range of 520 nm to 560 nm.
  • the light unit can be mentioned.
  • the half-value width of the emission intensity peak means the peak width at a height of 1/2 of the peak height.
  • the emission center wavelength of the blue light emitted by the backlight unit is preferably in the range of 440 nm to 475 nm.
  • the emission center wavelength of the green light emitted by the backlight unit is preferably in the range of 520 nm to 545 nm.
  • the emission center wavelength of the red light emitted by the backlight unit is preferably in the range of 610 nm to 640 nm.
  • the half-value width of each emission intensity peak of the blue light, green light, and red light emitted by the backlight unit is preferably 80 nm or less, preferably 50 nm or less. It is more preferably 40 nm or less, particularly preferably 30 nm or less, and extremely preferably 25 nm or less.
  • the light source of the backlight unit for example, a light source that emits blue light having a emission center wavelength in the wavelength range of 430 nm to 480 nm can be used.
  • the light source include an LED (Light Emitting Diode) and a laser.
  • the wavelength conversion member preferably includes at least a quantum dot phosphor R that emits red light and a quantum dot phosphor G that emits green light.
  • white light can be obtained from the red light and green light emitted from the wavelength conversion member and the blue light transmitted through the wavelength conversion member.
  • the light source of the backlight unit for example, a light source that emits ultraviolet light having a emission center wavelength in the wavelength range of 300 nm to 430 nm can be used.
  • the light source include LEDs and lasers.
  • the wavelength conversion member preferably includes a quantum dot phosphor B that is excited by excitation light and emits blue light, together with a quantum dot phosphor R and a quantum dot phosphor G. As a result, white light can be obtained from the red light, green light, and blue light emitted from the wavelength conversion member.
  • the backlight unit of the present embodiment may be an edge light type or a direct type.
  • FIG. 3 shows an example of a schematic configuration of an edge light type backlight unit.
  • the backlight unit 20 shown in FIG. 3 includes a light source 21 for emitting the blue light L B, a light guide plate 22 to be emitted guiding the blue light L B emitted from the light source 21, the light guide plate 22 and disposed to face
  • Wavelength conversion member 10 emits the red light L R and the green light L G part of the blue light L B as the excitation light, the red light L and R and the green light L G, the blue light was not the excitation light L B and are emitted.
  • the red light L R, the green light L G, and the blue light L B, the white light L W is emitted from the retroreflective member 23.
  • the image display device includes the backlight unit described above.
  • the image display device is not particularly limited, and examples thereof include a liquid crystal display device such as a television, a personal computer, and a mobile phone.
  • FIG. 4 shows an example of the schematic configuration of the liquid crystal display device.
  • the liquid crystal display device 30 shown in FIG. 4 includes a backlight unit 20 and a liquid crystal cell unit 31 arranged to face the backlight unit 20.
  • the liquid crystal cell unit 31 has a configuration in which the liquid crystal cell 32 is arranged between the polarizing plate 33A and the polarizing plate 33B.
  • the drive method of the liquid crystal cell 32 is not particularly limited, and is a TN (Twisted Nematic) method, an STN (Super Twisted Nematic) method, a VA (Vertical Birefringence) method, an IPS (In-Plane-Switching) method, and an OCB (Optical Birefringence) method.
  • TN Transmission Nematic
  • STN Super Twisted Nematic
  • VA Very Birefringence
  • IPS In-Plane-Switching
  • OCB Optical Birefringence
  • Example 1 [Manufacturing of wavelength conversion member] The materials shown below were mixed to prepare a resin composition.
  • Tricyclodecanedimethanol diacrylate (manufactured by Sartmer) -Pentaerythritol tetrakis (3-mercaptopropionate) (manufactured by Evans Chemetics) -Titanium oxide powder (trade name: R-706, manufactured by The Chemours Company) -4-Hydroxy-2,2,6,6-tetramethylpiperidin-N-oxyl (trade name: LA-7RD, manufactured by ADEKA CORPORATION) ⁇ 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (trade name: TPO, manufactured by BASF Japan Ltd.) -Quantum dot dispersion (green, manufactured by Nanosys, Inc.) and quantum dot dispersion (red, manufactured by Nanosys, Inc.)
  • the obtained resin composition was applied as a coating material to the anti-matte surface of a barrier film having a thickness of 72 ⁇ m to form a coating film.
  • the same coating material as above was placed on this coating film.
  • ultraviolet rays were irradiated using an ultraviolet irradiation device (Igraphics Co., Ltd.) (irradiation amount: 1000 mJ / cm 2 ) to cure the resin composition, and coating materials were arranged on both sides of the wavelength conversion layer.
  • the wavelength conversion member of was manufactured.
  • Each wavelength conversion member obtained above was cut into a circular dimension having a diameter of 20 mm to prepare a measurement sample.
  • the obtained circular measurement sample having a diameter of 20 mm was placed on the rotating part of the spin coating device and fixed by operating the vacuum pump. 1 mL of the polymer solution was added dropwise while rotating the measurement sample at a rate of 800 rpm.
  • the polymer solution was prepared by the following method. Polymethylmethacrylate (PMMA, Tokyo Chemical Industry Co., Ltd.) in a solvent prepared by mixing acetone (manufactured by Tokyo Chemical Industry Co., Ltd.) and p-xylene (manufactured by Tokyo Chemical Industry Co., Ltd.) so as to have a mass ratio of 5: 1.
  • a polymer-coated measurement sample was placed in a vacuum chamber and evacuated with an oil rotary pump and a turbo molecular pump until the degree of vacuum reached 2 ⁇ 10 -3 Pa. At this time, the chamber was not heated in particular, and all were carried out in a room temperature environment. After introducing trimethylaluminum (TMA) into the vacuum chamber, the inside of the system was once exhausted. By this operation, a molecular layer of TMA was deposited on the entire surface and edges of the measurement sample. Subsequently, a mixed gas of water vapor and argon was introduced to oxidize the molecular layer of TMA to form an aluminum layer. By repeating these operations, an atomic layer of aluminum was deposited on the measurement sample and repeated until a predetermined thickness was reached.
  • TMA trimethylaluminum
  • ⁇ Comparative example 1> [Manufacturing of wavelength conversion member] The materials shown below were mixed to prepare a resin composition.
  • Tricyclodecanedimethanol diacrylate (manufactured by Sartmer) -Pentaerythritol tetrakis (3-mercaptopropionate) (manufactured by Evans Chemetics) -Titanium oxide powder (trade name: R-706, manufactured by The Chemours Company) -4-Hydroxy-2,2,6,6-tetramethylpiperidin-N-oxyl (trade name: LA-7RD, manufactured by ADEKA CORPORATION) ⁇ 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (trade name: TPO, manufactured by BASF Japan Ltd.) -Quantum dot dispersion (green, manufactured by Nanosys, Inc.) and quantum dot dispersion (red, manufactured by Nanosys, Inc.)
  • the obtained resin composition was applied as a coating material to the anti-matte surface of a barrier film having a thickness of 72 ⁇ m to form a coating film.
  • the same coating material as above was placed on this coating film.
  • ultraviolet rays were irradiated using an ultraviolet irradiation device (Igraphics Co., Ltd.) (irradiation amount: 1000 mJ / cm 2 ) to cure the resin composition, and coating materials were arranged on both sides of the wavelength conversion layer.
  • the wavelength conversion member of was manufactured.
  • Each wavelength conversion member obtained above was cut into a circle with a diameter of 20 mm to prepare a measurement sample.
  • the measurement sample was placed in a vacuum chamber and evacuated with an oil rotary pump and a turbo molecular pump until the degree of vacuum reached 2 ⁇ 10 -3 Pa. At this time, the chamber was not heated in particular, and all were carried out in a room temperature environment. After introducing trimethylaluminum (TMA) into the vacuum chamber, the inside of the system was once exhausted. By this operation, a molecular layer of TMA was deposited on the entire surface and edges of the measurement sample. Subsequently, a mixed gas of water vapor and argon was introduced to oxidize the molecular layer of TMA to form an aluminum layer. By repeating these operations, an atomic layer of aluminum was deposited on the measurement sample and repeated until a predetermined thickness was reached.
  • TMA trimethylaluminum
  • ⁇ Comparative example 2> [Manufacturing of wavelength conversion member] The materials shown below were mixed to prepare a resin composition.
  • Tricyclodecanedimethanol diacrylate (manufactured by Sartmer) -Pentaerythritol tetrakis (3-mercaptopropionate) (manufactured by Evans Chemetics) -Titanium oxide powder (trade name: R-706, manufactured by The Chemours Company) -4-Hydroxy-2,2,6,6-tetramethylpiperidin-N-oxyl (trade name: LA-7RD, manufactured by ADEKA CORPORATION) ⁇ 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (trade name: TPO, manufactured by BASF Japan Ltd.) -Quantum dot dispersion (green, manufactured by Nanosys, Inc.) and quantum dot dispersion (red, manufactured by Nanosys, Inc.)
  • the presence of the metal oxide ALD layer and buffer layer suppressed the progress of edge deterioration and achieved a high brightness maintenance rate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)

Abstract

Cet élément de conversion de longueur d'onde comprend : une couche de conversion de longueur d'onde comprenant un matériau fluorescent ; un matériau de recouvrement disposé sur une ou les deux surfaces principales de la couche de conversion de longueur d'onde ; et une couche de protection qui est disposée sur la surface latérale de la couche de conversion de longueur d'onde et qui comprend une couche d'oxyde métallique et une couche de résine.
PCT/JP2020/041943 2019-11-29 2020-11-10 Élément de conversion de longueur d'onde et son procédé de fabrication, unité de rétroéclairage et dispositif d'affichage d'image WO2021106556A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024009823A1 (fr) * 2022-07-08 2024-01-11 日亜化学工業株式会社 Élément de conversion de longueur d'onde et procédé de fabrication d'élément de conversion de longueur d'onde

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015000967A (ja) * 2013-06-18 2015-01-05 デクセリアルズ株式会社 蛍光体シート
WO2017026349A1 (fr) * 2015-08-12 2017-02-16 富士フイルム株式会社 Film en couches
JP2017538166A (ja) * 2014-12-05 2017-12-21 オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツングＯｓｒａｍ Ｏｐｔｏ Ｓｅｍｉｃｏｎｄｕｃｔｏｒｓ ＧｍｂＨ 変換要素、オプトエレクトロニクス半導体部品、および変換要素の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015000967A (ja) * 2013-06-18 2015-01-05 デクセリアルズ株式会社 蛍光体シート
JP2017538166A (ja) * 2014-12-05 2017-12-21 オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツングＯｓｒａｍ Ｏｐｔｏ Ｓｅｍｉｃｏｎｄｕｃｔｏｒｓ ＧｍｂＨ 変換要素、オプトエレクトロニクス半導体部品、および変換要素の製造方法
WO2017026349A1 (fr) * 2015-08-12 2017-02-16 富士フイルム株式会社 Film en couches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024009823A1 (fr) * 2022-07-08 2024-01-11 日亜化学工業株式会社 Élément de conversion de longueur d'onde et procédé de fabrication d'élément de conversion de longueur d'onde

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