WO2018092705A1 - 量子ドット含有部材、シート部材、バックライト装置、及び、表示装置 - Google Patents

量子ドット含有部材、シート部材、バックライト装置、及び、表示装置 Download PDF

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Publication number
WO2018092705A1
WO2018092705A1 PCT/JP2017/040704 JP2017040704W WO2018092705A1 WO 2018092705 A1 WO2018092705 A1 WO 2018092705A1 JP 2017040704 W JP2017040704 W JP 2017040704W WO 2018092705 A1 WO2018092705 A1 WO 2018092705A1
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WIPO (PCT)
Prior art keywords
quantum dot
general formula
sheet member
sheet
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/040704
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English (en)
French (fr)
Japanese (ja)
Inventor
宮永　昭治
哲二 伊藤
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NS Materials Inc
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NS Materials Inc
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Filing date
Publication date
Application filed by NS Materials Inc filed Critical NS Materials Inc
Priority to CN201780070645.4A priority Critical patent/CN110268287A/zh
Priority to EP17871809.4A priority patent/EP3543750A4/en
Priority to JP2018551607A priority patent/JP6815577B2/ja
Priority to US16/461,152 priority patent/US20200079649A1/en
Publication of WO2018092705A1 publication Critical patent/WO2018092705A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/50—Sympathetic, colour changing or similar inks
    • 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, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • 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
    • 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
    • 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 
    • G02F1/015—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 semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
    • 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
    • G02F1/133602—Direct backlight
    • 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
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • 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
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/02—Frequency-changing of light, e.g. by quantum counters
    • 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
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/03—Viewing layer characterised by chemical composition
    • C09K2323/031—Polarizer or dye
    • 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 
    • G02F1/015—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 semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
    • G02F1/01791—Quantum boxes or quantum dots

Definitions

  • the present invention relates to a quantum dot-containing member, a sheet member, a backlight device, and a display device.
  • Patent Document 1 discloses an invention relating to a display device using a phosphor sheet.
  • Patent Document 1 discloses a display device in which barrier layers are arranged on both sides of a phosphor sheet.
  • the phosphor can be protected from temperature rise, humidity, and other harmful environmental conditions.
  • providing the barrier layer increases the number of parts and increases the thickness of the sheet member.
  • the present invention has been made in view of such points, and in particular, without providing a barrier layer, a quantum dot-containing member, a sheet member, a backlight device, and An object is to provide a display device.
  • the quantum dot-containing member of the present invention is a member in which quantum dots are dispersed in a resin, and a barrier layer is not disposed on the surface of the member.
  • the resin preferably contains the following general formula (1) and general formula (2).
  • the resin may contain the following general formula (3) and at least one selected from the general formula (4), the general formula (5), and the general formula (6). preferable.
  • the resin preferably contains the following general formula (7) or general formula (8).
  • the polymer constituting the resin has a high crosslinking density.
  • the normalized illuminance at 500 hours is preferably 0.6 or more.
  • the barrier layer is not arranged on either the light incident side or the light emitting side of the member.
  • the sheet member in the present invention is characterized by being configured using the quantum dot-containing member described above.
  • the backlight device according to the present invention is characterized by including the quantum dot-containing member described above or the sheet member described above.
  • a display device is characterized by including the above-described quantum dot-containing member or the above-described sheet member.
  • the quantum dot-containing member of the present invention it is possible to effectively suppress the change in light emission intensity with time without providing a barrier layer.
  • FIG. 1 is a longitudinal sectional view of a sheet member showing a first embodiment of the present invention.
  • the sheet member 1 is a sheet-like material in which quantum dots are dispersed by a resin, and barrier layers are provided on both sides and one side of the sheet member 1, in other words, on the light incident side and the light emitting side. Not equipped.
  • the sheet member 1 is formed in a thin plate shape, and in general, the “sheet” is configured such that the thickness is small relative to the length and width.
  • the sheet member 1 may or may not be flexible, but is preferably flexible.
  • the sheet member 1 may be simply called a sheet, or may be called a film or a film sheet.
  • film is defined as a flexible sheet.
  • the thickness may be changed depending on the location, or may be gradually changed in the length direction or the width direction, or may be changed stepwise. .
  • the length dimension L, the width dimension W, and the thickness dimension T of the sheet member 1 are not limited, and various dimensions are changed depending on the product. For example, it may be used for the backlight of a large product such as a TV, or it may be used for the backlight of a small portable device such as a smartphone. Therefore, the size is determined according to the product. become.
  • the sheet member 1 includes a large number of quantum dots, but may include fluorescent pigments, fluorescent dyes and the like in addition to the quantum dots.
  • a red quantum dot and a green normal phosphor YAG, Sialon, etc. may be mixed.
  • Quantum dots are nanoparticles having a particle size of about several nanometers to several tens of nanometers.
  • the quantum dots are formed of CdS, CdSe, ZnS, ZnSe, ZnSeS, ZnTe, ZnTeS, or the like. It is preferable that the quantum dot does not contain Cd and does not contain P. Cd has restrictions on its use in each country due to its toxicity. In addition, organophosphorus compounds are expensive, and are easily oxidized in the air, so that the synthesis becomes unstable, leading to increased costs, unstable fluorescent properties, and complicated manufacturing processes.
  • a large number of organic ligands 6 are coordinated on the surface of the quantum dots 5. Thereby, aggregation of quantum dots 5 can be suppressed and the target optical characteristic is expressed.
  • the ligand which can be used for reaction is not specifically limited, For example, the following ligands are mentioned as a typical thing.
  • the quantum dot 5 shown in FIG. 2B has a core-shell structure having a core 5a and a shell 5b coated on the surface of the core 5a. As shown in FIG. 2B, it is preferable that a large number of organic ligands 6 are coordinated on the surface of the quantum dots 5.
  • the core 5a of the quantum dot 5 shown in FIG. 2B is a nanoparticle shown in FIG. 2A. Accordingly, the core 5a is formed of, for example, the materials listed above. Although it does not ask the material of shell 5b, it is formed with zinc sulfide (ZnS) etc., for example.
  • the shell 5b preferably does not contain cadmium (Cd).
  • the shell 5b may be in a solid solution state on the surface of the core 5a.
  • the boundary between the core 5a and the shell 5b is indicated by a dotted line, but this indicates that the boundary between the core 5a and the shell 5b may or may not be confirmed by analysis.
  • Quantum dots include, for example, quantum dots having a fluorescence wavelength of about 520 nm (green) and about 660 nm (red). For this reason, when blue light is incident from the light incident surface, part of the blue color is converted into green or red by the quantum dots. Thereby, white light can be obtained from the light emitting surface.
  • the sheet member 1 shown in FIG. 1 has a single layer structure and is formed by being formed into a sheet shape.
  • the sheet member 1 may be a sheet-like material in which the quantum dot layer 3 is formed on at least one surface of the base film 2.
  • the quantum dot layer 2 can be formed on the surface of the base film 2 by coating.
  • the base film 2 is not particularly limited, but is preferably a PET (polyethylene terephthalate) film from the viewpoints of light transmittance, handleability (handling property), and adhesion with the quantum dot layer 3. It is.
  • the resin in which the quantum dots are dispersed contains the following general formula (1) and general formula (2).
  • General formula (1) is an isocyanurate compound. Moreover, General formula (2) is located in the terminal position of a resin polymer.
  • the isocyanurate compound represented by the general formula (1) and the resin monomer containing the terminal position represented by the general formula (2) are mixed.
  • the isocyanurate compound is a main material that improves durability, and the resin monomer containing the terminal position represented by the general formula (2) acts as a cross-linking agent, so that the sheet member 1 can be used as a barrier layer as in the prior art. Even if it is not coated with, it is possible to obtain excellent durability while maintaining high light emission intensity.
  • examples of the resin for dispersing the quantum dots include the following.
  • the resin preferably contains the following general formula (3), and at least one selected from general formula (4), general formula (5), and general formula (6).
  • the resin compound which combined general formula (3) and general formula (4), the resin compound which combined general formula (3) and general formula (5), and general formula (3) It is preferable to select at least any one of the resin compounds obtained by combining General Formula (6). In addition, you may select 2 or more types from General formula (4), General formula (5), and General formula (6), and may mix with General formula (3).
  • General formula (3) is triallyl isocyanurate
  • general formula (4) is pentaerythritol tetrakis (3-mercaptopropionate)
  • general formula (5) is (1,3,5-tris (3-mercabutbutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H-trione)
  • the general formula (6) is (dipentaerythritol hexakis (3 -Mercaptopropionate).
  • the normalized illuminance in 500 hours can be secured at 0.6 or more.
  • a normalized illuminance of 0.7 or more can be secured, and more preferably, a normalized illuminance of 0.8 or more can be secured.
  • the transmittance of the sheet member 1 can be 90% or more.
  • the coverage of 2020 (color gamut) can be 90% or more, and more preferably 95% or more.
  • the resin preferably contains the following general formula (7) or general formula (8).
  • the resin used for the sheet member 1 in addition to the above, polypropylene, polyethylene, polystyrene, AS resin, ABS resin, acrylic resin, methacrylic resin, polyvinyl chloride, polyacetal, polyamide, polycarbonate, modified Polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, polysulfone, polyethersulfone, polyphenylene sulfide, polyamideimide, polymethylpentene, liquid crystal polymer, epoxy resin, phenol resin, urea resin, melamine resin, epoxy resin, diallyl phthalate resin, Including unsaturated polyester resin, polyimide, polyurethane, silicone resin, styrenic thermoplastic elastomer or some mixture of these It is possible.
  • the light scattering agent 8 may be contained in the sheet member 1.
  • the light scattering agent 8 is contained in the quantum dot layer 3.
  • the material for the light scattering agent 8 is not particularly limited, fine particles such as SiO 2 , BN, and AlN can be presented.
  • the light scattering agent 8 is contained in the sheet member 1 or the quantum dot layer 3 in an amount of 1 to 10 wt%.
  • the thickener 9 is included in the sheet member 1.
  • the quantum dot layer 3 contains a thickener 9.
  • the material of the thickener 9 is not particularly limited, and examples thereof include carboxyvinyl polymer, carboxymethyl cellulose, acrylic acid methyl ester copolymer, bentonite (aluminum silicate) or hectorite (magnesium silicate) based additive.
  • the resin composition constituting the sheet member 1 and the quantum dot layer 3 can be adjusted to an appropriate viscosity, and the sheet member 1 and the quantum dot layer 3 can be formed in a predetermined thickness and shape. Easy to do.
  • a dispersant is included in order to improve the dispersibility of the quantum dots contained in the sheet member 1.
  • the material of the dispersant is not particularly limited, but epoxy resin, polyurethane, polycarboxylate, naphthalenesulfonate formalin condensation polymer, polyethylene glycol, polycarboxylic acid partially alkyl ester compound , Using polyether-based, polyalkylene polyamine, alkyl sulfonate, quaternary ammonium salt, higher alcohol alkylene oxide, polyhydric alcohol ester, alkyl polyamine, or polyphosphate dispersant Specifically, DISPERBYK (registered trademark) manufactured by Big Chemie Japan can be exemplified.
  • a protective layer having excellent water resistance may be provided at the end (edge) of the sheet member 1 including quantum dots.
  • the protective layer is not provided, and even when the end surface of the sheet member 1 is exposed, the quantum dots are deteriorated compared to the conventional case. Can be suppressed.
  • deterioration can be suppressed because the polymer has a high crosslinking density.
  • the sheet member 1 including the quantum dots of the present embodiment can be incorporated into, for example, the backlight device 55 shown in FIG.
  • the backlight device 55 is configured to include a plurality of light emitting elements 20 (LEDs) and the sheet member 1 of the present embodiment facing the light emitting elements 20.
  • each light emitting element 20 is supported on the surface of a support body 52.
  • the backlight device 55 is disposed on the back surface side of the display unit 54 such as a liquid crystal display to constitute the display device 50.
  • a diffuser plate for diffusing light, other sheets, and the like may be interposed between the light emitting element 20 and the display unit 54 in addition to the sheet member 1.
  • the sheet member 1 including the quantum dots shown in FIG. 7 is formed as a single sheet, for example, a plurality of sheet members 1 may be connected so as to have a predetermined size.
  • a configuration in which a plurality of sheet members 1 are connected by tiling is referred to as a composite sheet member.
  • the composite sheet member is disposed in place of the sheet member 1 of the display device 50 of FIG. 7, and the diffusion plate is disposed between the light emitting element 20 and the composite sheet member, that is, the light emitting element 20 / the diffusion plate / composite.
  • the configuration of the sheet member / display unit 54 will be considered. In such a configuration, light emitted from the light emitting element 20 and diffused by the diffusion plate is incident on the composite sheet member. Since the light diffused by the diffusion plate enters the composite sheet member, the light intensity distribution due to the distance from the light emitting element 20 is suppressed. In addition, since the distance between the light emitting element 20 and the composite sheet member is longer than when there is no diffusion plate, the influence of heat generated by the light emitting element 20 on the quantum dots included in the composite sheet is reduced.
  • the light emitting element 20 / the composite sheet member 21 / the diffusion plate 22 / the display unit 54 can be arranged in this order. According to this, even in the case where unevenness of emission color due to irregular reflection or deterioration of quantum dots due to water vapor entering from the joints occurs at the joints of the sheet members 1, the color of the display on the display unit 54 It is possible to appropriately suppress the occurrence of unevenness. That is, since the light emitted from the composite sheet member 21 is diffused by the diffusion plate 22 and then enters the display unit 54, color unevenness in the display of the display unit 54 can be suppressed.
  • the composite sheet member 21 When the composite sheet member 21 is used, it is preferable to use a diffuser plate disposed on the light exit surface side of the composite sheet member 21 regardless of the application to the display device shown in FIG.
  • the light guide member may be configured by providing the sheet member 1 of the present embodiment on the surface of the light guide plate 40.
  • the light emitting element 20 LED
  • the use of the sheet member 1 of this Embodiment is not limited to FIG.7, FIG8 and FIG.9.
  • the present embodiment it is possible to effectively suppress the temporal change of the light emission intensity of the sheet member 1 as compared with the conventional case. Therefore, the wavelength conversion characteristics when the sheet member 1 of the present embodiment is used as the backlight device 55 or the light guide member can be stabilized, and the lifetime of the backlight device 55 or the light guide member can be extended. be able to.
  • the sheet member 1 of the present embodiment can be flexible. Therefore, the sheet member 1 can be appropriately installed on a curved surface or the like.
  • the sheet member 1 of the present embodiment can be applied to an illumination device, a light source device, a light diffusion device, a light reflection device, and the like in addition to the above-described backlight device and light guide member.
  • FIG. 10 is a conceptual diagram showing a manufacturing apparatus for manufacturing the sheet member of the present embodiment.
  • FIG. 10 discloses an example of a manufacturing method of the sheet member 1 shown in FIG. 3 in which the quantum dot layer 3 is applied to the base film 2.
  • a first raw roll 30 that feeds the resin film 10 to be the base film 2 As shown in FIG. 10, a first raw roll 30 that feeds the resin film 10 to be the base film 2, a take-up roll 32, a press contact portion 35 constituted by a pair of nip rolls 33 and 34, and an application unit 36 and a heating unit 38.
  • the resin film 10 is sent out from the first raw fabric roll 30, and a resin composition 37 containing quantum dots is applied to the surface of the resin film 10 using an application means 36.
  • a coating method of the resin composition 37 include a coating method using a known coating coater or impregnation coating coater.
  • a gravure coater, a dip coater, a comma knife coater, etc. can be illustrated.
  • the resin film 10 on which the resin composition 37 is applied is heated by a heating unit 38 provided with a heater or the like. Thereby, the solvent contained in the resin composition 37 evaporates, and at this point, the quantum dot layer 2 is solidified to some extent.
  • the quantum dot layer 2 may be UV cured.
  • the interface between the quantum dot layer 2 and the resin film 10 is fixed by thermocompression bonding.
  • the sheet member 39 made of the resin film 10 / quantum dot layer 2 is wound up by the winding roll 32.
  • the sheet member 1 shown in FIG. 3 can be obtained by cutting the wound sheet member 39 into a predetermined size.
  • the quantum dot layer 2 is applied and formed on the surface of the resin film 10, and the quantum dot layer 2 can be formed with a thickness of about 10 to 500 ⁇ m.
  • the thickness of the resin film 10 is about several tens to 1000 ⁇ m, and therefore the thickness of the sheet member 1 is about 100 to 2500 ⁇ m.
  • the thickness of the quantum dot layer 2 and the thickness of the sheet member 1 are not limited.
  • the quantum dot layer 2 shown in FIG. 3 can be formed into a single layer without using a base film. That is, the sheet member 1 shown in FIG. 1 is formed into a sheet shape, and the sheet member 1 shown in FIG. 1 can be made thinner than the sheet member 1 shown in FIG. At this time, the sheet member 1 can be manufactured using methods such as injection molding, extrusion molding, hollow molding, thermoforming, compression molding, calendar molding, inflation method, casting method and the like.
  • the quantum dot layer 3 shown in FIG. 3 can be shape
  • the base resin film 2 can be bonded to the molded body of the quantum dot layer 3 by thermocompression bonding or the like.
  • An adhesive layer may be provided between the quantum dot layer 3 and the base film 2.
  • the sheet member is exemplified as the quantum dot-containing member, but the present invention is not limited to this.
  • a quantum dot having a fluorescence wavelength of about 520 nm (green) (sometimes referred to as a “green quantum dot”) and a quantum dot having a fluorescence wavelength of about 660 nm (red) may be referred to as a “red quantum dot”.
  • QD ink resin composition
  • Example 1 As a resin of QD ink, it contains general formula (3) and general formula (4), and DDT / BYK110 and ZnO (0.75%) were further added. And QD ink was apply
  • Example 2 As a resin of the QD ink, it contains general formula (3) and general formula (5), and DDT / BYK110 and ZnO (0.75%) were further added. And QD ink was apply
  • Example 3 As resin of QD ink, it contains general formula (3) and general formula (6), and DDT / BYK110 and ZnO (0.75%) were further added. And QD ink was apply
  • the total luminous flux when each sample was made to emit light with blue (wavelength: 450 nm) LED excitation light was measured by a total luminous flux measurement system manufactured by Otsuka Electronics Co., Ltd.
  • FIG. 11 is a graph obtained by measuring the relationship between elapsed time and green light intensity in this example, measured under the durability condition (1).
  • FIG. 12 is a graph obtained by measuring the relationship between elapsed time and red light intensity in this example, measured under the durability condition (1).
  • FIG. 13 is a graph obtained by measuring the relationship between elapsed time and green light intensity in this example, measured under the durability condition (2).
  • FIG. 14 is a graph obtained by measuring the relationship between elapsed time and red light intensity in this example, measured under the durability condition (2).
  • FIG. 15 is a graph obtained by measuring the relationship between the elapsed time and the green light intensity in this example, measured under the durability condition (3).
  • FIG. 16 is a graph obtained by measuring the relationship between elapsed time and red light intensity in this example, measured under the durability condition (3).
  • the normalized illuminance at 500 hours was 0.6 or more.
  • the normalized illuminance is 0.7 or more, and more preferably 0.8 or more.
  • the “standardized illuminance” is a light emission intensity ratio normalized with the light emission intensity at 0 hours (immediately after the end of the durability test) being set to 1.
  • Example 2 can suppress the change in emission intensity with time compared to Example 1 and Example 3.
  • FIG. 17 is a graph showing the relationship between the elapsed time and the blue light intensity measured using Examples 4 to 12 in the durability test (1) (60 ° C. and 90 RH LED lighting).
  • FIG. 18 is a graph showing the relationship between the elapsed time measured using Examples 4 to 12 and the green light intensity in the durability test (1).
  • FIG. 19 is a graph showing the relationship between elapsed time and red light intensity measured using Examples 4 to 12 in the durability test (1).
  • FIG. 20 is a graph showing the relationship between elapsed time and blue light intensity measured using Example 4 to Example 12 at 65 ° C. and 50 RH LED not lit (dark place) (endurance test (4)).
  • FIG. 21 is a graph showing the relationship between the elapsed time and green light intensity measured using Examples 4 to 12 in the durability test (4).
  • FIG. 22 is a graph showing the relationship between elapsed time and red light intensity measured using Examples 4 to 12 in the durability test (4).
  • FIG. 23 is a graph showing the relationship between the elapsed time and the blue light intensity measured using Example 4 to Example 12 at 85 ° C. without LED lighting (dark place) (endurance test (5)).
  • FIG. 24 is a graph showing the relationship between the elapsed time and green light intensity measured using Examples 4 to 12 in the durability test (5).
  • FIG. 25 is a graph showing the relationship between the elapsed time measured using Examples 4 to 12 and the red light intensity.
  • the normalized illuminance at 500 hours can be 0.6 or more.
  • the “standardized illuminance” is a light emission intensity ratio normalized with the light emission intensity at 0 hours (immediately after the end of the durability test) being set to 1.
  • a quantum dot layer in which quantum dots are mixed with an existing resin material is formed on a PET film, and the relationship between elapsed time and green light intensity is measured according to the durability condition (1). did.
  • the water vapor permeability of the sheet member in the comparative example was about 9 (g / m 2 ⁇ day).
  • the comparative example as shown in FIG. 26, it was found that after 500 hours, the normalized illuminance decreased to about 0.2, and the change with time was significantly increased.
  • the present invention it is possible to obtain a sheet member capable of effectively suppressing a change in light emission intensity with time, and using the sheet member of the present invention, a backlight device having a stable wavelength conversion characteristic, a light guide member, and a display device Etc. can be realized.

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EP17871809.4A EP3543750A4 (en) 2016-11-16 2017-11-13 Quantum dot-containing member, sheet member, backlight device and display device
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JPWO2018092705A1 (ja) 2019-10-17
TWI699564B (zh) 2020-07-21
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TW202040169A (zh) 2020-11-01
TW201833593A (zh) 2018-09-16
EP3543750A1 (en) 2019-09-25
CN110268287A (zh) 2019-09-20
JP6815577B2 (ja) 2021-01-20
JP2020181196A (ja) 2020-11-05
EP3543750A4 (en) 2020-06-10

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