WO2016104401A1 - 波長変換部材及びその製造方法 - Google Patents

波長変換部材及びその製造方法 Download PDF

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Publication number
WO2016104401A1
WO2016104401A1 PCT/JP2015/085632 JP2015085632W WO2016104401A1 WO 2016104401 A1 WO2016104401 A1 WO 2016104401A1 JP 2015085632 W JP2015085632 W JP 2015085632W WO 2016104401 A1 WO2016104401 A1 WO 2016104401A1
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WIPO (PCT)
Prior art keywords
layer
quantum dot
wavelength conversion
conversion member
sample
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Ceased
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PCT/JP2015/085632
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English (en)
French (fr)
Japanese (ja)
Inventor
宮永　昭治
榮一 金海
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NS Materials Inc
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NS Materials Inc
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Filing date
Publication date
Priority to EP15872969.9A priority Critical patent/EP3240051B1/en
Priority to US15/538,253 priority patent/US20170352789A1/en
Priority to EP20155097.7A priority patent/EP3667746B1/en
Priority to KR1020217007841A priority patent/KR102353095B1/ko
Priority to KR1020177018866A priority patent/KR102230594B1/ko
Priority to JP2016509796A priority patent/JP6422947B2/ja
Application filed by NS Materials Inc filed Critical NS Materials Inc
Priority to CN201580070808.XA priority patent/CN107431111A/zh
Publication of WO2016104401A1 publication Critical patent/WO2016104401A1/ja
Anticipated expiration legal-status Critical
Priority to US16/566,950 priority patent/US20200006603A1/en
Priority to US16/566,953 priority patent/US11316082B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8516—Wavelength conversion means having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer or wavelength conversion layer with a concentration gradient
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/81—Bodies
    • H10H20/811—Bodies having quantum effect structures or superlattices, e.g. tunnel junctions
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/01—Manufacture or treatment
    • H10H20/036—Manufacture or treatment of packages
    • H10H20/0361—Manufacture or treatment of packages of wavelength conversion means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • H10H20/8513—Wavelength conversion materials having two or more wavelength conversion materials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/858—Means for heat extraction or cooling
    • H10H20/8586—Means for heat extraction or cooling comprising fluids, e.g. heat-pipes

Definitions

  • the present invention relates to a wavelength conversion member used for a backlight or the like and a method of manufacturing the same.
  • Patent Document 1 discloses an invention relating to a quantum dot film and a lighting device using the same.
  • FIG. 6A of Patent Document 1 discloses a lighting device 600 having a QD (quantum dot) phosphor material 604 and barrier layers 620 and 622 disposed on both sides thereof.
  • QD quantum dot
  • barrier layers 620 and 622 disposed on both sides thereof.
  • Patent Document 1 no particular mention is made of the relationship between the structure of the barrier layer and the change with time of the light emission intensity. That is, in Patent Document 1, the configuration of the barrier layer is not restricted in view of the temporal change in emission intensity.
  • the wavelength conversion member in the present invention has a quantum dot layer having quantum dots, and barrier layers formed on at least both sides of the quantum dot layer, and the water vapor transmission rate of the barrier layer is 9 (g / m It is characterized in that it is lower than 2 ⁇ day). Thereby, the temporal change of the light emission intensity can be effectively suppressed as compared with the prior art.
  • the barrier layer is formed on the entire circumference of the quantum dot layer.
  • the winding start end and the winding end of the barrier layer be joined on the same side of the quantum dot layer.
  • the barrier layers disposed on upper and lower sides of the quantum dot layer are joined to each other on both sides of the quantum dot layer.
  • the quantum dot layer is formed of a molded body or formed by an inkjet method.
  • the barrier layer is preferably formed to have at least an organic layer. Thereby, the handling of the barrier layer can be facilitated (handling improvement).
  • the barrier layer has a laminated structure, and the organic layer is formed on the innermost layer facing the quantum dot layer.
  • the quantum dot layer can be easily formed on the barrier layer, and the adhesion between the barrier layer and the quantum dot layer can be improved.
  • an inorganic layer is provided on the outer side of the innermost layer in the barrier layer. Therefore, the barrier properties of the barrier layer can be effectively improved.
  • the inorganic layer is preferably formed of a SiO 2 layer.
  • the quantum dot layer contains a thickener.
  • the viscosity is easily lowered when the dispersant is added, and therefore, it is preferable to adjust the viscosity by adding a thickener.
  • the thickness of the quantum dot layer can be uniformly formed to a predetermined thickness, and good fluorescence characteristics can be obtained.
  • the method of manufacturing a wavelength conversion member according to the present invention is characterized in that the entire periphery of the quantum dot layer having quantum dots is covered with the barrier layer.
  • a step of forming a plurality of quantum dot layers at intervals on the surface of the lower barrier layer, an upper barrier layer extending from the surface of the lower barrier layer to the surface of the plurality of quantum dot layers further comprises the steps of: forming the lower barrier layer between the quantum dot layers and cutting the upper barrier layer between the quantum dot layers so as to divide each quantum dot layer.
  • a plurality of wavelength conversion members can be obtained simultaneously by a simple process.
  • the quantum dot layer by a molded body or by an inkjet method.
  • the barrier layer has an organic layer, and the organic layer is directed to the innermost side facing the quantum dot layer.
  • the adhesion between the barrier layer and the quantum dot layer can be improved, the wettability of the surface of the organic layer is high, and the formation of the quantum dot layer can be facilitated.
  • the barrier layer having a plurality of organic layers and an inorganic layer interposed between the organic layer and the organic layer is used to form the innermost and the barrier layers facing the quantum dot layer. It is preferable to make the outermost surface the said organic layer.
  • the presence of the organic layer on both sides of the barrier layer can improve the handling property and facilitate the formation of the quantum dot layer. Further, the inclusion of the inorganic layer can effectively improve the barrier properties of the barrier layer.
  • the quantum dot layer can be adjusted to a moderate viscosity, and the quantum dot layer can be easily formed on the surface of the barrier layer with a predetermined thickness.
  • the temporal change of the light emission intensity can be effectively suppressed as compared with the related art.
  • FIG. 9 It is a graph which shows the relationship between elapsed time and the x coordinate of a CIE color system with respect to the sample 12 to the sample 14.
  • FIG. It is a graph which shows the relationship between elapsed time and the y-coordinate of a CIE color system with respect to the sample 12 to the sample 14.
  • FIG. It is an emission spectrum with respect to the sample 9. It is an emission spectrum with respect to the sample 10. It is an emission spectrum with respect to the sample 11. It is an emission spectrum with respect to the sample 12. It is an emission spectrum with respect to the sample 13. It is an emission spectrum with respect to the sample 14.
  • film is defined as a flexible sheet.
  • the thickness may change depending on the place, or may gradually change in the length direction or the width direction, or change stepwise. Good.
  • the length dimension L, the width dimension W, and the thickness dimension T of the wavelength conversion member 1 are not limited, and various dimensions are changed depending on the product. For example, it may be used as a backlight for a large product such as a television, or as a backlight for a small portable device such as a smartphone, so that the size is determined according to the product. become.
  • the quantum dot layer 2 includes a large number of quantum dots, but fluorescent pigments, fluorescent dyes and the like may be contained in addition to the quantum dots.
  • the quantum dot layer 2 is preferably formed of a resin composition in which quantum dots are dispersed.
  • resin polypropylene, polyethylene, polystyrene, AS resin, ABS resin, acrylic resin, methacrylic resin, polyvinyl chloride, polyacetal, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, polyethylene mone terephthalate, polysulfone, poly Ether sulfone, polyphenylene sulfide, polyamide imide, polymethyl pentene, liquid crystal polymer, epoxy resin, phenol resin, urea resin, urea resin, melamine resin, epoxy resin, diallyl phthalate resin, unsaturated polyester resin, polyimide, polyurethane, silicone resin, styrene system Thermoplastic elastomers or mixtures of some of these can be used.
  • urethane-acrylic resins urethane-acrylates, styrenic thermoplastic elastomers and the like can be preferably applied.
  • styrenic thermoplastic elastomer Kuraray Hibler (registered trademark) can be exemplified.
  • the quantum dot in the present embodiment can have a core of semiconductor particles with a diameter of 2 to several tens of nm.
  • the quantum dot can have a shell portion that covers the periphery of the core.
  • the diameter of the core of the semiconductor particles may be 2 to 20 nm, preferably 2 to 15 nm.
  • the material of the core is not particularly limited.
  • a core material containing at least Zn and Cd a core material containing Zn, Cd, Se and S, ZnCuInS, CdS, ZnSe, ZnS, CdSe, InP, CdTe, and some composites of these It is possible to use things etc.
  • the quantum dots include, for example, quantum dots having fluorescence wavelengths of about 520 nm (green) and about 660 nm (red). For this reason, when blue light is incident from the light incident surface 1a as shown in FIG. 1, part of the blue is converted to green or red by the quantum dots. Thereby, white light can be obtained from the light emitting surface 1b.
  • the quantum dot layer 2 is formed, for example, by applying a resin composition in which quantum dots are dispersed on the surface of a film-like barrier layer, or forming it in a predetermined shape in advance.
  • the barrier layers 3 and 4 are respectively disposed on both sides of the quantum dot layer 2. As shown in FIG. 1B, the barrier layers 3 and 4 can be bonded to both sides of the quantum dot layer 2 via the adhesive layer 7. By providing the barrier layers 3 and 4 as described above, both surfaces of the quantum dot layer 2 can be protected, and the environmental resistance (durability) can be improved. Conventionally, a configuration in which barrier layers are disposed on both sides of a quantum dot layer has been considered (Patent Document 1). However, the configuration of the barrier layer is not limited in view of suppressing the temporal change of the emission intensity of the wavelength conversion member.
  • the water vapor permeability of the barrier layers 3 and 4 is set to be lower than 9 (g / m 2 ⁇ day).
  • the "water vapor permeability" can be measured based on JIS-K7129 (2008).
  • the water vapor transmission rate can be measured using a moisture-sensitive sensor method, an infrared sensor method, or a gas chromatograph method, but is not limited thereto.
  • the water vapor transmission rate of the barrier layers 3 and 4 is preferably 5 (g / m 2 ⁇ day) or less, more preferably 3 (g / m 2 ⁇ day) or less, It is more preferably 1 (g / m 2 ⁇ day) or less, still more preferably 0.1 (g / m 2 ⁇ day) or less, and still more preferably 0.01 (g / m 2 ⁇ day) or less Is more preferred.
  • the water vapor permeability is most preferably 6 ⁇ 10 -3 (g / m 2 ⁇ day) or less.
  • the water vapor transmission rate of the barrier layers 3 and 4 it is possible to effectively suppress the temporal change of the light emission intensity as compared with the prior art.
  • a quantum dot having a green fluorescence wavelength when used, a sample using a barrier layer having a water vapor transmission rate of 9 (g / m 2 ⁇ day) with the passage of time
  • the emission intensity of the blue (incident light) fluorescence wavelength gradually became stronger, while the emission intensity of the green fluorescence wavelength became sharply weaker.
  • the temperature was 60 ° C., and the humidity was 90%.
  • the quantum dot layer 2 and the barrier layers 3 and 4 are joined via the adhesive layer 7, but as shown in FIG. 1C, the adhesive layer 7 is eliminated and both sides of the quantum dot layer 2 'are It is also possible to bond the barrier layers 3 and 4 directly.
  • the sheet thickness of the wavelength conversion member 1 can be reduced, and can be adjusted to, for example, 100 ⁇ m or less.
  • the quantum dot layer 2 is formed by calendar molding, so that no base material for supporting the quantum dot layer 2 is necessary.
  • the sheet thickness of 2 can be formed thin, specifically, can be formed to be about 70 ⁇ m or less, and the sheet thickness of the wavelength conversion member 1 can be formed thin.
  • the water vapor transmission rate of the barrier layers 3 and 4 is smaller than 9 (g / m 2 ⁇ day)
  • preferable materials and configurations of the barrier layers 3 and 4 in the present embodiment will be described.
  • the presence or absence of the adhesive layer and the state of the quantum dot layer are not limited.
  • the barrier layers 3 and 4 are formed of a single layer of the organic layer 5.
  • the organic layer 5 constitutes a resin film, and the barrier layers 3 and 4 thus exist as a resin film, so that the barrier layers 3 and 4 can be handled easily.
  • the organic layer 5 and the quantum dot layer 2 are in contact with each other.
  • the surface of the organic layer 5 is excellent in wettability, and the quantum dot layer 2 can be easily formed on the surface of the barrier layers 3 and 4 with a predetermined thickness when the quantum dot layer 2 is applied and formed. it can.
  • the adhesion between the quantum dot layer 2 and the organic layer 5 can be improved by thermocompression bonding or the like.
  • the organic layer 5 is preferably a PET (polyethylene terephthalate) film.
  • PET polyethylene terephthalate
  • the barrier layers 3 and 4 are formed in a laminated structure of the organic layer 5 and the inorganic layer 6.
  • the organic layer 5 is formed in the innermost layer on the side in contact with the quantum dot layer 2 of the barrier layers 3 and 4, and the inorganic layer 6 is formed in the outer side (innermost surface layer) of the innermost layer.
  • the organic layer 5 is preferably a PET (polyethylene terephthalate) film.
  • the inorganic layer 6 is preferably a SiO 2 layer.
  • the inorganic layer 6 may be a layer of silicon nitride (SiN x ), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ) or silicon oxide (SiO 2 ), or a laminate of these.
  • the provision of the organic layer 5 can facilitate the handling of the barrier layers 3 and 4.
  • the organic layer 5 and the quantum dot layer 2 can be brought into contact with each other. Therefore, as in the case of FIG. 2, the formation of the quantum dot layer 2 can be facilitated during coating formation, and the adhesion between the quantum dot layer 2 and the organic layer 5 can be improved.
  • FIG. 3 by providing the barrier layers 3 and 4 with the inorganic layer 6, excellent barrier properties can be obtained even if the barrier layers 3 and 4 are thin.
  • the barrier properties mentioned here refer to the water vapor permeability and the gas barrier, and in the present embodiment, the water vapor permeability of the barrier layers 3 and 4 even when the film thickness of the barrier layers 3 and 4 is reduced to several tens of ⁇ m Can be made lower than 9 (g / m 2 ⁇ day). Gas barrier properties may be evaluated by oxygen permeability.
  • the barrier layers 3 and 4 have a two-layer structure of one organic layer 5 and one inorganic layer 6, but a plurality of organic layers 5 and a plurality of inorganic layers 6 are alternately stacked.
  • the structure (however, the innermost layer of the barrier layers 3 and 4 is preferably the organic layer 5) can be employed.
  • the barrier layers 3 and 4 are formed in a laminated structure of a plurality of organic layers 5 and an inorganic layer 6 interposed between the organic layers 5.
  • the organic layer 5 is preferably a PET (polyethylene terephthalate) film.
  • the organic layer 5 preferably contains a diffusing agent.
  • a diffusion promoting layer can also be formed between the quantum dot layer 2 and the organic layer 5.
  • the inorganic layer 6 is preferably a SiO 2 layer.
  • the inorganic layer 6 may be a layer of silicon nitride (SiN x ), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ) or silicon oxide (SiO 2 ), or a laminate of these.
  • the barrier layers 3 and 4 each have a three-layer structure of two organic layers 5 and one inorganic layer 6, but may have five or more layers.
  • both the advantages in the barrier structure shown in FIG. 2 and in the barrier structure shown in FIG. 3 can be obtained. That is, as shown in FIG. 4A, the innermost layer and the outermost layer of the barrier layers 3 and 4 are formed of the organic layer 5. Therefore, the handling of the barrier layers 3 and 4 can be more effectively facilitated, and further, the adhesion between the barrier layers 3 and 4 and the quantum dot layer 2, the ease of formation of the quantum dot layer 2, and the barrier The barrier properties of the layers 3 and 4 can be effectively improved.
  • each barrier layer 3 and 4 can also make each barrier layer 3 and 4 into the laminated structure of the inorganic layer 6 / organic layer 5 / inorganic layer 6.
  • FIG. 4A since the plurality of inorganic layers 6 are disposed in the barrier layers 3 and 4, the barrier properties of the barrier layers 3 and 4 can be further improved.
  • the barrier layers 3 and 4 are disposed one by one on each side of the quantum dot layer 2. That is, the layer structure of each barrier layer 3 and 4 is different from the single layer structure as shown in FIG. 2 or the laminated structure as shown in FIG. 3 and FIG. 4A.
  • the barrier property represented by the water vapor transmission rate of 3 and 4 is, for example, a notary value.
  • each barrier layer 3, 4, 7, 8 is formed, for example, in a single layer structure or a laminated structure shown in FIG. 2, FIG. 3 and FIG. 4A, and between barrier layer 3 and barrier layer 7 and a barrier The layer 4 and the barrier layer 8 are bonded with an adhesive or the like.
  • each barrier layer 3, 4, 7, 8 has a laminated structure of organic layer (for example, PET film) / inorganic layer (for example, SiO 2 ), and the inorganic layer is directed to the inside of the quantum dot layer 2 side , Laminate the organic layer outward. Therefore, in FIG.
  • the barrier layer 8 (organic layer / inorganic layer) / barrier layer 4 (organic layer / inorganic layer) / quantum dot layer 2 / barrier layer 7 (inorganic layer / Organic layer) / barrier layer 3 (inorganic layer / organic layer) are laminated in this order.
  • the laminated structure of the barrier layers disposed on both sides of the quantum dot layer 2 is a symmetrical structure, but may be asymmetrical.
  • the process shown next may be performed. That is, in the embodiment shown in FIG. 5, the surfaces of the barrier layers 3 and 4 are matted.
  • the barrier layers 3 and 4 can be formed as an inorganic layer / organic layer / mat layer. Thereby, the surfaces 3a and 4a of the barrier layers 3 and 4 are uneven. Matting may be performed on either the barrier layer 3 or the surface of the barrier layer 4.
  • the light scattering agent 8 may be contained in the quantum dot layer 2.
  • the light scattering agent 8 is not particularly limited in its material, but can present fine particles of SiO 2 , BN, AlN or the like.
  • the light scattering agent 8 is contained in an amount of 1 to 10 wt% with respect to the quantum dot layer 2.
  • the light scattering agent 8 may be contained in the barrier layers 3 and 4.
  • the concentration of the light scattering agent 8 contained in the quantum dot layer 2 and the concentration of the light scattering agent contained in the barrier layers 3 and 4 may be the same or different.
  • the barrier layers 3 and 4 shown in FIGS. 5 and 6 may have any of the structures shown in FIGS.
  • the surface of the barrier layer 3 or the barrier layer 4 may be matted, and the quantum dot layer 2 may contain the light scattering agent 8, and the barrier layer 3 or the barrier layer 4 may contain the light scattering agent 8. It may be
  • the quantum dot layer 2 contains a thickener 9.
  • the material of the thickener 9 is not particularly limited, and examples thereof include carboxyvinyl polymer, carboxymethylcellulose, acrylic acid methyl ester copolymer, bentonite (aluminum silicate) or hectorite (magnesium silicate) -based additive.
  • the resin composition constituting the quantum dot layer 2 can be adjusted to an appropriate viscosity, and the quantum dot layer 2 can be easily formed into a predetermined thickness and a predetermined shape.
  • barrier layers 3 and 4 may be matted as in FIG.
  • the viscosity of the resin in order to keep the viscosity of the resin in a predetermined range so that the formation of the quantum dot layer 2 is easy, it is preferable to adjust the viscosity by adding the above-mentioned thickener or the like.
  • the values of the viscosity shown in Table 1 are merely examples, and can be appropriately adjusted to the required viscosity.
  • barrier layers are disposed at least on the upper and lower sides of the quantum dot layer 2, and both sides of the quantum dot layer 2 (right and left sides with respect to the quantum dot layer 2) Not specified.
  • the barrier layer is formed on the entire circumference of the quantum dot layer 2.
  • FIG. 8 is a longitudinal sectional view of a wavelength conversion member showing an eighth embodiment of the present invention.
  • the winding start end 82 and the winding end 83 of the barrier layer 81 are overlapped.
  • the positions where the winding start end 82 and the winding end 83 are overlapped may be any position of the upper surface 80, the lower surface, the right side and the left side of the quantum dot layer 2.
  • the winding start end 82 and the winding end 83 are joined by thermocompression bonding and adhesion.
  • the barrier layer 81 can be used without waste.
  • the overall shape of the wavelength conversion member 60 shown in FIG. 8 is not particularly limited, and is in the shape of a stick, a block, a chip or the like, or the length of the quantum dot layer 2 shown in FIG.
  • the dimensions may be elongated in sheet form.
  • FIG. 9 is a longitudinal sectional view of a wavelength conversion member showing a ninth embodiment of the present invention.
  • the barrier layer 81 covers the entire circumference of the quantum dot layer 2 and is wound with the winding start end 82 of the barrier layer 81 at the same side with respect to the quantum dot layer 2 (right side in the figure with respect to the quantum dot layer 2).
  • the end 83 is joined by thermocompression bonding or the like.
  • the winding start end 82 and the winding end 83 of the barrier layer 81 are joined on the same side with respect to the quantum dot layer 2 so that the junction between the winding start end 82 and the winding end 83 is It can be performed in a region that does not affect the dot layer 2.
  • FIG. 10 is a longitudinal sectional view of a wavelength conversion member showing a tenth embodiment of the present invention.
  • the quantum dot layer 2 is provided on the lower barrier layer 85, and the upper barrier layer 86 is provided to cover the lower barrier layer 85 and the quantum dot layer 2.
  • the barrier layers 85 and 86 disposed on the upper and lower sides of the quantum dot layer 2 are bonded to each other on both sides of the quantum dot layer 2 (right and left sides in the figure with respect to the quantum dot layer 2) by adhesion or thermocompression bonding.
  • the barrier layers 85 and 86 are bonded on both sides of the quantum dot layer 2, the influence of the bonding process on the quantum dot layer 2 can be suppressed.
  • FIG. 10 is a longitudinal sectional view of a wavelength conversion member showing a tenth embodiment of the present invention.
  • the barrier layers 85 and 86 are divided into two, and the quantum dot layer 2 is sandwiched between the barrier layers 85 and 86, It is not necessary to wind the barrier layer 81 around the entire circumference of the quantum dot layer 2 as in the configuration shown in FIG. Therefore, the wavelength conversion member 60 in which the barrier layer is formed all around the quantum dot layer 2 can be easily manufactured, and the configuration shown in FIG. 10 is suitable for mass production of the wavelength conversion member 60.
  • the quantum dot layer 2 is formed of a molded body. That is, the quantum dot layer 2 is formed, for example, by injection molding, and the barrier layer is disposed to the quantum dot layer 2 as a molded body. By forming the quantum dot layer 2 with a molded body, wavelength conversion members of various shapes can be easily and appropriately formed.
  • the quantum dot layer 2 is not limited to the configuration formed of a molded body, and may be formed by application. In the case of application, a barrier layer is prepared in advance, and the quantum dot layer 2 is formed on the surface of the barrier layer by application.
  • an inkjet method and a dispenser method can be illustrated as application
  • the quantum dot layer 62 is formed by the inkjet method.
  • the quantum dot layer 62 is formed by the inkjet method, and the configuration of the barrier layer 81 with respect to the quantum dot layer 62 is the same as that in FIG.
  • the quantum dot layer 62 is formed by the inkjet method, and the configuration of the barrier layer 81 with respect to the quantum dot layer 62 is the same as that in FIG.
  • the quantum dot layer 62 is formed by the inkjet method, and the configuration of the barrier layer 81 with respect to the quantum dot layer 62 is the same as that in FIG.
  • the film thickness of the quantum dot layer 62 can be formed very thin.
  • the surface 61 a of the wavelength conversion member 61 can be planarized.
  • the wavelength conversion members 1, 60, 61 of the present embodiment can be incorporated into, for example, a backlight device 55 shown in FIG. 15 to 17 illustrate the case of the wavelength conversion member 1.
  • the backlight device 55 is configured by including a plurality of light emitting elements 20 (LEDs) and the wavelength conversion 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 52.
  • the backlight device 55 is disposed on the back surface side of the display unit 54 such as a liquid crystal display to configure the display device 50.
  • a diffusion plate that diffuses light, another sheet, and the like may be interposed between the light emitting element 20 and the display unit 54.
  • one sheet-shaped wavelength conversion member 1 is disposed between the light emitting element 20 and the display unit 54 as shown in FIG.
  • the plurality of wavelength conversion members 1 may be joined so as to have a predetermined size.
  • a configuration in which a plurality of wavelength conversion members 1 are connected by tiling is referred to as a composite wavelength conversion member.
  • the composite wavelength conversion member is disposed instead of the wavelength conversion member 1 of the display device 50 of FIG. 15, and a diffusion plate is disposed between the light emitting element 20 and the composite wavelength conversion member, ie, light emitting element 20 / diffusion
  • a diffusion plate is disposed between the light emitting element 20 and the composite wavelength conversion member, ie, light emitting element 20 / diffusion
  • the configuration of the plate / composite wavelength conversion 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 wavelength conversion member. Since the light diffused by the diffusion plate is incident on the composite wavelength conversion member, the light intensity distribution due to the distance from the light emitting element 20 can be suppressed. In addition, since the distance between the light emitting element 20 and the composite wavelength conversion member is longer than in the case where there is no diffusion plate, the heat generated by the light emitting element 20 has less influence on the quantum dots contained in the composite sheet.
  • the light emitting element 20 / the composite wavelength conversion member 21 / the diffusion plate 22 / the display unit 54 can be arranged in this order. According to this, even when unevenness of the emission color occurs at the joint of each wavelength conversion member 1 due to the irregular reflection or the deterioration of the quantum dot due to the water vapor entering from the joint, the display unit 54 displays the It is possible to appropriately suppress the occurrence of color unevenness. That is, since the light emitted from the composite wavelength conversion 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 wavelength conversion member 1 of the present embodiment is provided on the surface of the light guide plate 40 and at least one between the light guide plate 40 and the light emitting element 20 to configure the light guide member It may be As shown in FIG. 17, the light emitting element 20 (LED) is disposed on the side surface of the light guide plate 40.
  • the application of the wavelength conversion member 1 of the present embodiment is not limited to FIGS. 15, 16 and 17.
  • the wavelength conversion member 1 of this Embodiment can be made flexible. Therefore, the wavelength conversion member 1 can be properly installed on a curved surface or the like.
  • the wavelength conversion 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, etc., in addition to the above-described backlight device and light guide member.
  • FIGS. 15, 16, and 17 it is also possible to use a wavelength conversion member 61 in which the quantum dot layer 62 shown in FIGS. 11 to 13 is formed by an inkjet method.
  • the wavelength conversion members 1, 60, 61 shown in FIGS. 1 to 13 may be disposed inside the glass capillary.
  • FIG. 18 is a conceptual view showing a manufacturing apparatus for manufacturing the wavelength conversion member of the present embodiment.
  • a first original fabric roll 30 for delivering the resin film 10 to be the barrier layer 3 a second original fabric roll 31 for delivering the resin film 11 to be the barrier layer 4, and a winding roll 32 It has the press-contacting part 35 comprised by a pair of nip rolls 33 and 34, the application means 36, and the heating part 38, and is comprised.
  • the resin film 10 having a water vapor permeability smaller than 9 (g / m 2 ⁇ day) is sent out from the first original fabric roll 30, and the coating means 36 is used on the surface of the resin film 10.
  • a resin composition 37 containing quantum dots As a coating method of the resin composition 37, a coating method using a known coating coater or an impregnation coating coater may be mentioned. For example, a gravure coater, a dip coater, a comma knife coater, etc. can be illustrated.
  • the resin composition 37 can also be applied by an inkjet method.
  • the resin film 10 with the resin composition 37 applied on the surface is heated by the heating unit 38 provided with a heater or the like. Thereby, the solvent contained in the resin composition 37 is evaporated, and at this point, the quantum dot layer 2 is solidified to some extent.
  • the resin film 11 having a water vapor permeability smaller than 9 (g / m 2 ⁇ day) sent from the second original fabric roll 31 is exposed on the exposed surface of the quantum dot layer 2.
  • the laminated structure of the resin film 11 / quantum dot layer 2 / resin film 10 is brought into pressure contact in the nip rolls 33, 34 constituting the pressure contact part 35.
  • the interface between the quantum dot layer 2 and each of the resin films 10 and 11 is fixed by thermocompression bonding.
  • the sheet member 39 composed of the resin film 11 / quantum dot layer 2 / resin film 10 is taken up by the take-up roll 32.
  • the sheet-like wavelength conversion member 1 can be obtained by cutting the wound sheet member 39 into a predetermined size.
  • the resin films 10 and 11 described in FIG. 18 have a single-layered structure of the organic layer 5 shown in FIG. 2 or a laminated structure of the organic layer 5 and the inorganic layer 6 shown in FIGS. 3 and 4.
  • the inorganic layer 6 is interposed between the plurality of organic layers 5.
  • the resin films 10 and 11 have a laminated structure of PET film / SiO 2 layer / PET film.
  • a stack of resin films may be sent out and disposed on both sides of the quantum dot layer, and a plurality of barrier layers may be laminated on both sides of the quantum dot layer as shown in FIG. 4B. is there.
  • the mat treatment can be realized by a method of sandblasting the surface of the sheet, a method of coating a mat layer on the surface of the sheet, or the like, but the method is not particularly limited.
  • the light scattering agent 8 can be contained in the resin composition 37 applied by the application means 36 shown in FIG.
  • the viscosity of the resin composition 37 can be adjusted moderately by containing the thickener 9 in the resin composition 37 apply
  • the viscosity is not limited, it can be adjusted to, for example, several hundred to several thousand (mPa ⁇ sec).
  • the quantum dot layer 2 is formed by coating on the surface of the resin film 10.
  • the quantum dot layer 2 is formed in advance, and the resin films 10 and 11 are formed on both sides Can also be attached.
  • the quantum dot layer 2 may be produced by a method such as injection molding, extrusion molding, hollow molding, thermoforming, compression molding, calendar molding, inflation method, casting method and the like.
  • the thickness of the compact of the quantum dot layer 2 can be about 10 to 500 ⁇ m.
  • the thickness of the compact of the quantum dot layer 2 can be formed to be about 300 ⁇ m.
  • the resin films 10 and 11 can be bonded together by thermocompression bonding etc. on the both sides of the molded object of the quantum dot layer 2.
  • FIG. An adhesive layer may be provided between the quantum dot layer 2 and the resin films 10 and 11.
  • Methods of forming the film of the wavelength conversion member 1 include a method performed by a coating machine and a method performed by a molding machine, and a curing method by the coating machine includes ultraviolet curing and thermal curing.
  • the resin films 10 and 11 having a water vapor permeability smaller than 9 can be appropriately and easily disposed on both sides of the quantum dot layer 2. Thereby, it is possible to easily manufacture the wavelength conversion member 1 capable of effectively suppressing the temporal change of the light emission intensity as compared with the related art.
  • FIG. 19 is a conceptual diagram for explaining a method of manufacturing a wavelength conversion member showing an eighth embodiment of the present invention.
  • the quantum dot layer 2 is formed of a compact.
  • the barrier layer 81 is disposed over the entire circumference of the quantum dot layer 2, and as shown in the right view of FIG.
  • the winding start end 82 and the winding end 83 are thermocompression-bonded using the thermocompression-bonding member 90 while overlapping the top surface 80).
  • thermocompression bonding can be performed, for example, by pressing the winding start end 82 and the winding end 83 with a press or a roller while heating.
  • an adhesive may be used to join the winding start end 82 and the winding end 83.
  • the winding start end 82 and the winding end 83 are thermocompression-bonded using the thermocompression-bonding member 90.
  • thermocompression bonding of the winding start end 82 and the winding end 83 etc. Influence on the quantum dot layer 2 at the time of bonding (thermal effects etc.) can be reduced. Therefore, the deterioration of the quantum dot layer 2 in the step of forming the barrier layer 81 can be suppressed.
  • the winding start end 82 and the winding end 83 may be bonded by adhesion.
  • FIG. 21 is a conceptual diagram for explaining a method of manufacturing a wavelength conversion member showing a tenth embodiment of the present invention.
  • the plurality of quantum dot layers 2 are disposed on the surface of the barrier layer 85 at intervals.
  • the quantum dot layer 2 is a molded body, and a plurality of previously molded quantum dot layers 2 are arranged on the surface of the barrier layer 85. At this time, it is preferable to adhere and fix between the quantum dot layer 2 and the barrier layer 85.
  • the barrier layer 86 is disposed from the surface of the barrier layer 85 to the surface of each quantum dot layer 2.
  • an adhesive layer is coated on the inner surface side (the surface facing the barrier layer 85 and the quantum dot layer 2) of the barrier layer 86, and the barrier layer 85 and the barrier layer 86 are bonded via the quantum dots 2.
  • the barrier layer 85 and the barrier layer 86 can be bonded by thermocompression bonding.
  • the barrier layers 85 and 86 being joined are cut between the quantum dot layers 2 adjacent to each other, and divided into each quantum dot layer 2. Thereby, a plurality of wavelength conversion members 60 can be obtained simultaneously.
  • the barrier layer can be disposed on the entire periphery of the quantum dot layer 2 by overlapping the barrier layers 85 and 86.
  • the wavelength conversion member 60 in which the layer is formed can be manufactured simply and appropriately, and moreover, it is suitable for mass production of the wavelength conversion member 60.
  • the entire circumference of the quantum dot layer 2 can be covered with the barrier layer, and the entire circumference of the quantum dot layer 2 can be appropriately protected by the barrier layer, which is more effective.
  • the durability can be improved. Thereby, deterioration of the quantum dot layer 2 can be suppressed more appropriately.
  • the quantum dot layer 2 shown in FIGS. 19 to 21 is, for example, a molded body, but as shown in FIGS. 11 to 13, the quantum dot layer 2 may be formed by an inkjet method.
  • the resin composition in which the quantum dots are dispersed is ejected onto the barrier layer by the inkjet method.
  • the discharged resin composition is preferably heated for stabilization.
  • the temperature at the time of heating is preferably 30 to 80 ° C., and more preferably 30 to 50 ° C.
  • the resin films 10 and 11 have an organic layer, and the quantum dot layer 2 and the organic layer be brought into contact in the manufacturing process.
  • the quantum dot layer 2 can be formed on the surface of the highly wettable organic layer, the formation of the quantum dot layer 2 can be facilitated, and the adhesion is improved by the affinity between the barrier layer and the quantum dot layer 2 It can be done.
  • the resin films 10 and 11 may have a laminated structure of a plurality of inorganic layers and an organic layer interposed between the inorganic layers. Also, a plurality of resin films can be stacked and disposed. At this time, the resin films 10 and 11 can be bonded by bonding or thermocompression bonding with an adhesive.
  • Example 1 A 3-layer structure film of PET film / SiO 2 layer / PET film, and a barrier layer having a water vapor transmission rate of 6 ⁇ 10 ⁇ 3 (g / m 2 ⁇ day).
  • the thickness of the barrier layer is 49 ⁇ m.
  • Example 2 A barrier layer with a water vapor transmission rate of 9 (g / m 2 ⁇ day) in a three-layer structure of PET film / SiO 2 layer / PET film.
  • the thickness of the barrier layer is 50 ⁇ m.
  • Durability tests were conducted on the laminates using the barrier layers of Samples 1 to 3 under the conditions of a temperature of 60 ° C. and a humidity of 90%.
  • the luminous intensity was measured by using a total luminous flux measurement system manufactured by Otsuka Electronics Co., Ltd. when each sample was caused to emit light with blue (wavelength: 450 nm) LED excitation light.
  • FIG. 23 is a graph showing the relationship between elapsed time and blue light intensity (450 nm area) for each sample.
  • the blue light intensity is the area of the emission peak measured at a wavelength of 450 nm.
  • the blue light intensity (450 nm area) gradually increases with the passage of time. That is, it was found that the blue light intensity of Sample 2 and Sample 3 increased with the passage of time.
  • the blue light intensity (450 nm area) is constant and the blue light intensity does not change even if time passes.
  • the blue light intensity change is represented by [(blue light intensity in initial state ⁇ blue light intensity after 150 hours) / blue light intensity in initial state] ⁇ 100 (%) (absolute value).
  • FIG. 24 is a graph measuring the relationship between elapsed time and green light intensity (green area) for each sample.
  • the green light intensity is the area of the emission peak measured at a wavelength of 520 nm.
  • the green light intensity (green area) was gradually decreased with the passage of time.
  • the increase in blue light intensity and the decrease in green light intensity mean that the green quantum dots are deteriorated with the passage of time.
  • the blue light intensity (450 nm area) did not change even when time passes, and the decrease of the green light intensity (green area) could be reduced compared to the sample 2 and the sample 3.
  • the green light intensity change was found to be within 50%, which is smaller than Sample 3.
  • the green light intensity change is represented by [(green light intensity in initial state ⁇ green light intensity after 150 hours) / green light intensity in initial state] ⁇ 100 (%) (absolute value).
  • the water vapor transmission rate of the barrier layer was set to a value lower than 9 (g / m 2 ⁇ day) based on the measurement results shown in FIGS. 23 and 24. Further, the water vapor transmission rate of the barrier layer of sample 1 is 6 ⁇ 10 -3 (g / m 2 ⁇ day) or less, which is the most preferable range.
  • Sample 1 described above as a barrier layer Sample 5 having a water vapor transmission rate of 1.6 ⁇ 10 -2 (g / m 2 ⁇ day), and a water vapor transmission rate of 8.4 ⁇ 10 -3 (g The sample 6 of / m 2 ⁇ day) was used.
  • the transmittance of light (%) was 86.8 (total light) for sample 1, 92.5 (wavelength 450 nm) for sample 5, and 90.6 (wavelength 450 nm) for sample 6.
  • FIG. 25 is a graph showing the relationship between the elapsed time and the x-coordinate of the CIE color system for each sample.
  • Sample 4 shows a sample without barrier layer (molded body of quantum dot layer).
  • both sides of the quantum dot layer were sandwiched by the barrier films of the above samples, and a light emitting element (LED) was placed on one barrier film side via a diffusion plate. And it measured by the spectrometer from the other barrier film side.
  • LED light emitting element
  • FIG. 22 is a schematic view of a luminescence tester used in the experiment. A portion of the luminescence tester is shown in longitudinal section. As shown in FIG. 22, in the light emission tester 56, the light emitting element 20 (LED) and the sample S were disposed at positions facing the light emitting element 20. Each sample in the experiment was a sheet in which the quantum dot layer was sandwiched between the barrier films described above, and the end faces were bonded with, for example, an epoxy bond treatment and an aluminum tape. The light emitting element 20 is supported on the surface of the support 52, and the diffusion plate 22 is interposed between the light emitting element 20 and the sample S.
  • LED light emitting element 20
  • the sample S were disposed at positions facing the light emitting element 20.
  • Each sample in the experiment was a sheet in which the quantum dot layer was sandwiched between the barrier films described above, and the end faces were bonded with, for example, an epoxy bond treatment and an aluminum tape.
  • the light emitting element 20 is supported on the surface of the support 52, and the diffusion
  • the y-coordinate change is represented by [(y-coordinate intensity in initial state ⁇ y-coordinate intensity after 200 hours) / y-coordinate intensity in initial state] ⁇ 100 (%) (absolute value).
  • FIG. 27 is a graph showing the relationship between elapsed time and normalized illuminance for each sample. As shown in FIG. 27, except for the sample 4 without the barrier, in the samples 1, 5 and 6, no decrease in the normalized illuminance with the passage of time was observed. In this result, the fluctuation was within ⁇ 30% in 200 hours.
  • a barrier layer having a water vapor transmission rate of 10 -2 (g / m 2 ⁇ day) is used as sample 7
  • a barrier layer having a water vapor transmission rate of 10 -1 (g / m 2 ⁇ day) is used as sample 8
  • the water vapor permeability of these barrier layers is a notary value.
  • seat demonstrated in the description location with respect to said FIG. 22 was formed, and the time-dependent change of the spectrum was measured with the light emission test device of FIG.
  • FIG. 28 is a graph showing the relationship between the elapsed time and the x-coordinate of the CIE color system for each sample.
  • sample 1 and sample 2 described above were also used.
  • Sample 2 having a barrier layer with a water vapor transmission rate of 9 had a change in x-coordinate immediately after the start of the experiment.
  • Sample 1 Sample 7 and Sample 8 having barrier layers with a water vapor transmission rate of 10 -1 (g / m 2 ⁇ day) or less show no change in x coordinate over time, or the change is very large. It was small.
  • the x-coordinate change is represented by [(x-coordinate intensity in initial state-1 x-coordinate intensity after 1 100 hours) / x-coordinate intensity in initial state] ⁇ 100 (%) (absolute value).
  • the y-coordinate change is represented by [(y-coordinate intensity in initial state-1 y-coordinate intensity after 1 100 hours) / y-coordinate intensity in initial state] ⁇ 100 (%) (absolute value).
  • FIG. 30 is a graph showing the relationship between elapsed time and normalized illuminance for each sample. As shown in FIG. 30, in Samples 1, 7 and 8, except for Sample 2 having a barrier layer with a water vapor transmission rate of 9 (g / m 2 ⁇ day), the decrease in normalized illuminance with the passage of time was observed. It was not possible or the variation was very small. In this result, the fluctuation was within ⁇ 30% in 200 hours.
  • a barrier layer having a water vapor permeability of greater than about 0.1 (g / m 2 ⁇ day) can sufficiently improve the durability. From the above, it is preferable to set the water vapor permeability of the barrier layer to 0.1 (g / m 2 ⁇ day) or less.
  • Samples 9 to 14 are obtained by dissolving an elastomer in organosilane, quantum dots having a fluorescence wavelength of about 520 nm (green), and quantum dots having a fluorescence wavelength of about 650 nm (red) (sometimes referred to as "red quantum dots").
  • the QD ink (resin composition) in which was dispersed was used.
  • As the elastomer Kuraray Hibler (registered trademark) 7311 was used.
  • a heat treatment was performed to evaporate the solvent of the QD ink to form a quantum dot layer.
  • the quantum dot layer used in the experiment was prepared in high concentration and low concentration.
  • the barrier layer a sheet member having a SiO 2 layer formed on a PET film was used, and one having a water vapor transmission rate of about 10 ⁇ 3 (g / m 2 ⁇ day) was used.
  • the configuration of the sample (wavelength conversion member) used in the experiment was as follows.
  • a wavelength conversion member comprising only a quantum dot layer without a barrier layer.
  • Example 10 The wavelength conversion member shown in FIG. In addition, on the upper surface of the quantum dot layer, the winding start end and the winding end of the barrier layer were overlapped and thermocompression-bonded.
  • Example 11 The wavelength conversion member shown in FIG. In addition, the winding start end and the winding end of the barrier layer were stacked on both sides of the quantum dot layer and thermocompression-bonded.
  • the endurance test was performed on each of the above samples under conditions of a temperature of 60 ° C. and a humidity of 90%.
  • the luminous intensity was measured by using a total luminous flux measurement system manufactured by Otsuka Electronics Co., Ltd. when each sample was caused to emit light with blue (wavelength: 450 nm) LED excitation light.
  • a total luminous flux measurement system manufactured by Otsuka Electronics Co., Ltd. when each sample was caused to emit light with blue (wavelength: 450 nm) LED excitation light.
  • FIG. 31 is a graph measuring the relationship between elapsed time and blue light intensity (450 nm area) for sample 9 to sample 11.
  • the blue light intensity is the area of the emission peak measured at a wavelength of 450 nm.
  • the blue light intensity change is represented by [(blue light intensity in initial state ⁇ blue light intensity after 450 hours) / blue light intensity in initial state] ⁇ 100 (%) (absolute value).
  • FIG. 32 is a graph measuring the relationship between elapsed time and green light intensity (green area) for sample 9 to sample 11.
  • the green light intensity is the area of the emission peak measured at a wavelength of 520 nm.
  • the increase in the blue light intensity and the decrease in the green light intensity mean that the green quantum dots have deteriorated with the passage of time.
  • samples 10 and 11 it is understood that the blue light intensity (450 nm area) does not change and the decrease in green light intensity (green area) can be reduced even with time as compared with sample 9.
  • the change in green light intensity is represented by [(green light intensity in initial state ⁇ green light intensity after 450 hours) / green light intensity in initial state] ⁇ 100 (%) (absolute value).
  • FIG. 33 is a graph showing the relationship between the elapsed time and the red light intensity (red area) for samples 9 to 11.
  • the red light intensity is the area of the emission peak measured at a wavelength of 650 nm.
  • the red light intensity (red area) sharply decreased in 50 hours from the start of the experiment.
  • the increase in the blue light intensity and the decrease in the red light intensity mean that the red quantum dots are deteriorated with the passage of time.
  • samples 10 and 11 it is understood that the blue light intensity (450 nm area) does not change and the decrease in red light intensity (red area) can be reduced even with time as compared with sample 9.
  • the red light intensity change is represented by [(red light intensity in initial state ⁇ red light intensity after 450 hours) / green light intensity in initial state] ⁇ 100 (%) (absolute value).
  • FIG. 34 is a graph showing the relationship between the elapsed time and the x-coordinate of the CIE color system for samples 9 to 11.
  • FIG. 35 is a graph showing the relationship between the elapsed time and the y-coordinate of the CIE color system for the samples 9 to 11.
  • the sample 9 in which the barrier layer is not provided has a large fluctuation in the y-coordinate with the passage of time as compared with the sample 9 and the sample 10 in which the barrier layer surrounds the entire circumference of the quantum dot layer. It was seen.
  • the y-coordinate change is represented by [(y-coordinate intensity in initial state ⁇ y-coordinate intensity after 450 hours) / y-coordinate intensity in initial state] ⁇ 100 (%) (absolute value).
  • sample 12 A wavelength conversion member comprising only a quantum dot layer without a barrier layer.
  • Example 13 The wavelength conversion member shown in FIG. In addition, on the upper surface of the quantum dot layer, the winding start end and the winding end of the barrier layer were overlapped and thermocompression-bonded.
  • Example 14 The wavelength conversion member shown in FIG. In addition, the winding start end and the winding end of the barrier layer were stacked on both sides of the quantum dot layer and thermocompression-bonded.
  • the endurance test was performed on each of the above samples under conditions of a temperature of 60 ° C. and a humidity of 90%.
  • the luminous intensity was measured by using a total luminous flux measurement system manufactured by Otsuka Electronics Co., Ltd. when each sample was caused to emit light with blue (wavelength: 450 nm) LED excitation light.
  • FIG. 36 is a graph measuring the relationship between elapsed time and blue light intensity (450 nm area) for sample 12 to sample 14.
  • FIG. 37 is a graph measuring the relationship between the elapsed time and the green light intensity (green area) for the samples 12 to 14.
  • the green light intensity is the area of the emission peak measured at a wavelength of 520 nm.
  • changes in blue light intensity (450 nm area) and green light intensity (green area) with time can be made smaller than those of the sample 12 all right.
  • FIG. 38 is a graph showing the relationship between the elapsed time and the red light intensity (red area) for samples 12 to 14.
  • the red light intensity is the area of the emission peak measured at a wavelength of 650 nm.
  • the samples 13 and 14 can have smaller changes in blue light intensity (450 nm area) and red light intensity (red area) with the passage of time, as compared with the sample 12. I understand.
  • FIG. 39 is a graph showing the relationship between the elapsed time and the x-coordinate of the CIE color system from sample 12 to sample 14.
  • FIG. 40 is a graph showing the relationship between the elapsed time and the y-coordinate of the CIE color system from sample 12 to sample 14.
  • the change in y coordinate is 5 It was found to be within%.
  • the y-coordinate change is represented by [(y-coordinate intensity in initial state ⁇ y-coordinate intensity after 189 hours) / y-coordinate intensity in initial state] ⁇ 100 (%) (absolute value).
  • the samples 13 and 14 in which the quantum dot layer is surrounded by the barrier layer have variations in x coordinate and y coordinate with elapsed time as compared with the sample 12 in which the barrier layer is not provided. It was small.
  • the sample 14 gave better results than the sample 13.
  • FIGS. 41 to 43 show the spectrum of light emitted when the sample 9 is irradiated with blue light of 450 nm from the sample 9.
  • the horizontal axis is the wavelength (Wavelength), and the vertical axis is the light intensity.
  • spectra after 0 hour (immediately after the start of the experiment) and after 450 hours are shown.
  • FIG. 41 in sample 9, significant changes were observed in the spectrum after 0 hour and 450 hours.
  • FIGS. 42 and 43 samples 10 and 11 were found to have smaller changes in spectra after 0 and 450 hours as compared to sample 9.
  • the periphery of the quantum dot layer is covered with a barrier layer, whereby the deterioration of the quantum dot can be appropriately suppressed, and as a result, the change with time of the emission intensity can be effectively suppressed. all right.
  • FIGS. 44 to 46 are spectra of light emitted when the sample 12 is irradiated with blue light of 450 nm.
  • the horizontal axis is the wavelength (Wavelength), and the vertical axis is the light intensity.
  • spectra after 0 hour (immediately after the start of the experiment) and after 189 hours are shown.
  • FIG. 44 in sample 12, significant changes were observed in the spectrum after 0 and 189 hours.
  • FIGS. 45 and 46 samples 13 and 14 were found to have smaller changes in spectra after 0 hour and 189 hours as compared with sample 12.
  • the periphery of the quantum dot layer is covered with a barrier layer, whereby the deterioration of the quantum dots can be appropriately suppressed, and as a result, the change with time of the emission intensity can be effectively suppressed. all right.
  • the present invention it is possible to obtain a wavelength conversion member capable of effectively suppressing the temporal change in emission intensity, and using the wavelength conversion member of the present invention, a backlight device provided with stable wavelength conversion characteristics, a light guide member, A display device or the like can be realized.

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PCT/JP2015/085632 2014-12-26 2015-12-21 波長変換部材及びその製造方法 Ceased WO2016104401A1 (ja)

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US15/538,253 US20170352789A1 (en) 2014-12-26 2015-12-21 Wavelength converting member and method of producing the same
EP20155097.7A EP3667746B1 (en) 2014-12-26 2015-12-21 Method for manufacturing a wavelength conversion member
KR1020217007841A KR102353095B1 (ko) 2014-12-26 2015-12-21 파장 변환 부재 및 그 제조 방법
KR1020177018866A KR102230594B1 (ko) 2014-12-26 2015-12-21 파장 변환 부재 및 그 제조 방법
JP2016509796A JP6422947B2 (ja) 2014-12-26 2015-12-21 波長変換部材の製造方法
EP15872969.9A EP3240051B1 (en) 2014-12-26 2015-12-21 Method for manufacturing a wavelength conversion member
CN201580070808.XA CN107431111A (zh) 2014-12-26 2015-12-21 波长转换构件及其制造方法
US16/566,950 US20200006603A1 (en) 2014-12-26 2019-09-11 Wavelength converting member and method of producing the same
US16/566,953 US11316082B2 (en) 2014-12-26 2019-09-11 Wavelength converting member and method of producing the same

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WO2017159720A1 (ja) * 2016-03-18 2017-09-21 日東電工株式会社 光学部材、ならびに、該光学部材を用いたバックライトユニットおよび液晶表示装置
JP2018018973A (ja) * 2016-07-28 2018-02-01 富士フイルム株式会社 バックライト用フィルム
JP2018056552A (ja) * 2016-08-05 2018-04-05 マブン オプトロニックス カンパニー リミテッドＭａｖｅｎ Ｏｐｔｒｏｎｉｃｓ Ｃｏ．， Ｌｔｄ． 耐湿性チップスケールパッケージ発光素子
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