WO2017138179A1 - 有機エレクトロルミネッセンス発光装置 - Google Patents
有機エレクトロルミネッセンス発光装置 Download PDFInfo
- Publication number
- WO2017138179A1 WO2017138179A1 PCT/JP2016/075624 JP2016075624W WO2017138179A1 WO 2017138179 A1 WO2017138179 A1 WO 2017138179A1 JP 2016075624 W JP2016075624 W JP 2016075624W WO 2017138179 A1 WO2017138179 A1 WO 2017138179A1
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- layer
- sealing
- organic
- emitting device
- resin
- Prior art date
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- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
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- 229940075444 barium iodide Drugs 0.000 description 1
- OOULUYZFLXDWDQ-UHFFFAOYSA-L barium perchlorate Chemical compound [Ba+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O OOULUYZFLXDWDQ-UHFFFAOYSA-L 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
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- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- MOOUSOJAOQPDEH-UHFFFAOYSA-K cerium(iii) bromide Chemical compound [Br-].[Br-].[Br-].[Ce+3] MOOUSOJAOQPDEH-UHFFFAOYSA-K 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
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- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
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- 239000011888 foil Substances 0.000 description 1
- 229910000373 gallium sulfate Inorganic materials 0.000 description 1
- SBDRYJMIQMDXRH-UHFFFAOYSA-N gallium;sulfuric acid Chemical compound [Ga].OS(O)(=O)=O SBDRYJMIQMDXRH-UHFFFAOYSA-N 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
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- 239000002346 layers by function Substances 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- OTCKOJUMXQWKQG-UHFFFAOYSA-L magnesium bromide Chemical compound [Mg+2].[Br-].[Br-] OTCKOJUMXQWKQG-UHFFFAOYSA-L 0.000 description 1
- 229910001623 magnesium bromide Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- BLQJIBCZHWBKSL-UHFFFAOYSA-L magnesium iodide Chemical compound [Mg+2].[I-].[I-] BLQJIBCZHWBKSL-UHFFFAOYSA-L 0.000 description 1
- 229910001641 magnesium iodide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
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- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
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- 229920001225 polyester resin Polymers 0.000 description 1
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- 239000011112 polyethylene naphthalate Substances 0.000 description 1
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- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
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- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- YRGLXIVYESZPLQ-UHFFFAOYSA-I tantalum pentafluoride Chemical compound F[Ta](F)(F)(F)F YRGLXIVYESZPLQ-UHFFFAOYSA-I 0.000 description 1
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 239000010409 thin film Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
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- 239000011800 void material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
Definitions
- the present invention relates to an organic electroluminescence light emitting device having a hygroscopic agent layer in a sealing member.
- Organic EL light emitting device including an organic electroluminescence (EL) element has already been put into practical use as a light emitting device capable of planar light emission.
- Organic EL light emitting devices are also applied to displays and lighting equipment, and their development is expected.
- Patent Document 1 discloses an organic EL light emitting device having a configuration in which an organic EL element is covered with a transparent multilayer barrier made of a double barrier film, and a hygroscopic agent is disposed in each of an inner barrier film and an outer barrier film. Are listed. Patent Document 1 describes that the moisture resistance is improved when the organic EL element is doubled by a barrier film having a hygroscopic agent.
- Patent Document 2 an organic EL element is sealed with a resin sealing layer, a protective layer made of a metal foil is provided on the resin sealing layer, and further, light emission is performed between the resin sealing layer and the protective layer.
- An organic EL light emitting device in which a moisture absorption layer is provided at a position surrounding a light emitting region of the layer is described.
- the moisture absorption layer is formed to the outside of the end portion of the light emitting region, and the resin sealing layer is formed to the outside of the moisture absorption layer, so that moisture entering the resin sealing layer efficiently absorbs moisture. It is stated that the layer absorbs moisture.
- Patent Document 3 describes an organic EL light emitting device in which an organic EL element is covered with a gas barrier sheet having a gas barrier film and a moisture absorbing film, and a moisture absorbing film is provided at a position covering the upper surface and side surfaces of the organic EL element. ing. Patent Document 3 describes that the influence of moisture on the organic EL element is suppressed by covering the side surface of the organic EL element with a moisture absorbent layer.
- Patent Document 1 Patent Document 2, Patent Document 3
- the influence of moisture on the organic EL element cannot be sufficiently suppressed, and the organic EL light emitting device has sufficient reliability. Not obtained.
- the hygroscopic agent arranged in the sealing member cannot sufficiently exhibit the ability, and the deterioration of the organic EL element due to the influence of moisture cannot be sufficiently suppressed. For this reason, the reliability of the organic EL light emitting device cannot be sufficiently improved.
- the present invention provides a highly reliable organic electroluminescence light-emitting device capable of suppressing the influence of moisture with a hygroscopic agent.
- An organic electroluminescence light emitting device of the present invention includes an organic electroluminescence element having a first electrode, an organic EL layer, and a second electrode provided on a flexible substrate, and an organic electroluminescence element on the flexible substrate.
- a first sealing portion that seals the electroluminescence element; a hygroscopic agent layer provided on the first sealing portion; and a second sealing portion that covers the hygroscopic agent layer and the first sealing portion.
- a highly reliable organic electroluminescence light emitting device can be provided.
- organic EL light emitting device the organic electroluminescence light emitting device of the present invention
- FIG. 1 the schematic block diagram of the organic electroluminescent light emitting device of this Embodiment is shown.
- the organic EL light-emitting device shown in FIG. 1 is configured to include a bottom emission type organic electroluminescence element (hereinafter referred to as an organic EL element) that takes out light emission from the substrate side.
- an organic EL element bottom emission type organic electroluminescence element
- the 1 includes an organic EL element 12 on a flexible substrate 11.
- the organic EL light emitting device 10 shown in FIG. A first sealing portion 13 for sealing the organic EL element 12 is provided, and a hygroscopic agent layer 16 is provided on the first sealing portion 13.
- the 2nd sealing part 14 and the 3rd sealing part 15 which seal the flexible base material 11, the organic EL element 12, the 1st sealing part 13, and the hygroscopic agent layer 16 are provided.
- an FPC (Flexible Printed Circuits) 17 is provided for leading each electrode of the organic EL element 12 to the outside of the second sealing portion 14 and the third sealing portion 15.
- the organic EL element 12 includes, for example, a first electrode (transparent electrode) formed on the flexible substrate 11, an organic EL layer formed on the first electrode, and the organic EL layer sandwiched between the first electrode.
- the first sealing portion 13 includes a first resin sealing layer 21 and a first sealing substrate 22.
- the second sealing portion 14 includes a second resin sealing layer 23 and a second sealing substrate 24.
- the third sealing portion 15 includes a third resin sealing layer 25 and a third sealing substrate 26.
- the organic EL element 12 is disposed on one surface of the flexible substrate 11 (hereinafter, the surface of the flexible substrate 11). Specifically, the organic EL element 12 is disposed on the surface of the flexible substrate 11 and is flexible so that the peripheral portion of the surface of the flexible substrate 11 is exposed around the organic EL element 12. It arrange
- the organic EL element 12 is sealed on the flexible substrate 11 by the first sealing portion 13.
- the organic EL element 12 includes a surface of the organic EL element 12 opposite to the flexible substrate 11 (hereinafter referred to as the organic EL element 12), and an organic EL layer and an electrode of the organic EL element 12. And the laminated surface side (hereinafter, the side surface of the organic EL element 12) are covered with the first resin sealing layer 21. That is, in the organic EL element 12, one main surface is in contact with the flexible base material 11, and the main surface that is not in contact with the flexible base material 11 and the entire side surface are covered with the first resin sealing layer 21. ing. Therefore, the periphery of the organic EL element 12 is covered with the flexible base material 11 and the first resin sealing layer 21.
- the first resin sealing layer 21 is also provided on the periphery of the organic EL element 12 exposed on the surface of the flexible substrate 11. And the 1st resin sealing layer 21 is provided to the edge part of the flexible base material 11, and the flexible base material 11 and the 1st resin sealing layer 21 become an edge in a substantially the same position. In addition, the 1st resin sealing layer 21 should just cover the organic EL element 12, and does not need to cover all the peripheral parts of the flexible base material 11. FIG. For this reason, the flexible substrate 11 may be exposed from the periphery of the first resin sealing layer 21. In addition, the first resin sealing layer 21 is in close contact with the organic EL element 12 and the flexible base material 11, and there is a gap between the first resin sealing layer 21, the organic EL element 12, and the flexible base material 11. It is preferable not to have.
- the first sealing substrate 22 is bonded to the first resin sealing layer 21.
- the first sealing substrate 22 is disposed on the surface opposite to the flexible base material 11 with respect to the first resin sealing layer 21 (hereinafter, referred to as the first resin sealing layer 21). That is, in the first sealing portion 13, the first resin sealing layer 21 has a role of covering the organic EL element 12 and bonding the first sealing substrate 22.
- the first sealing substrate 22 has the same shape as the flexible base material 11, and the edge of the flexible base material 11 and the edges of the flexible base material 11 and the first resin sealing layer 21. Are almost the same position.
- the 1st sealing substrate 22 should just be arrange
- the FPC 17 is connected to the lead wires.
- the portion connected to the lead-out wiring on the flexible substrate 11 is covered with the first resin sealing layer 21 and sealed by the first sealing portion 13, similarly to the organic EL element 12. Yes.
- the organic EL element 12 is formed by the flexible base material 11 and the first sealing portion 13 by the structure in which the organic EL element 12 is sandwiched between the flexible base material 11 and the first sealing substrate 22. It is sealed.
- the configuration of the flexible substrate 11, the organic EL element 12, and the first sealing portion 13 having this structure is referred to as a first sealing unit 19.
- the first sealing unit 19 includes other configurations other than these. Also good.
- various layers provided between the flexible substrate 11 and the organic EL element 12, an inorganic sealing layer for sealing the organic EL element 12, and the like may be provided.
- the hygroscopic agent layer 16 is disposed on the first sealing unit 19.
- the hygroscopic agent layer 16 is disposed on the surface of the first sealing unit 19 opposite to the first resin sealing layer 21 of the first sealing substrate 22 (hereinafter referred to as the first sealing substrate 22).
- the organic EL light emitting device 10 is configured to extract light emitted from the organic EL element 12 from the flexible substrate 11 side. For this reason, it is difficult to arrange the hygroscopic agent layer 16 in a sufficient area on the main surface on the flexible substrate 11 side. Therefore, in order to provide a sufficient amount of the hygroscopic agent layer 16, it is necessary to dispose the first sealing unit 19 on the side opposite to the direction in which the light from the organic EL element 12 is extracted.
- the shape and the like of the moisture absorbent layer 16 are not particularly limited as long as the moisture absorbent layer 16 is disposed on the first sealing substrate 22.
- the hygroscopic agent layer 16 and the first sealing substrate 22 have the same shape, and the edge of the hygroscopic agent layer 16 and the first sealing substrate 22 are arranged at the same position. May be.
- the hygroscopic layer 16 may have a smaller area than the first sealing substrate 22.
- the area of the hygroscopic layer 16 is preferably 60% or more of the area of the first sealing substrate 22. More preferably, it is 80% or more.
- the hygroscopic layer 16 may protrude from the first sealing substrate 22 as long as it can be sealed by the second sealing portion 14, and has a larger area than the first sealing substrate 22. May be.
- the hygroscopic agent layer 16 may be formed directly on the first sealing substrate 22 or may be bonded onto the first sealing substrate 22 by an adhesive layer or the like. Even if another configuration is provided between the hygroscopic agent layer 16 and the first sealing unit 19, the hygroscopic agent layer 16 may be disposed above the first sealing unit 19.
- the second sealing portion 14 includes a second resin sealing layer 23 that covers the upper surface of the hygroscopic agent layer 16 and the side surfaces of the hygroscopic agent layer 16 and the first sealing unit 19. And a second sealing substrate 24 bonded to the upper surface side of the first sealing unit 19.
- the third sealing portion 15 includes a surface of the flexible substrate 11 on which the organic EL element 12 is not mounted (hereinafter, the back surface of the flexible substrate 11), and the first sealing unit 19. It has the 3rd resin sealing layer 25 which covers a side surface, and the 3rd sealing substrate 26 bonded together by this 3rd resin sealing layer 25 on the lower surface side of the 1st sealing unit 19.
- the second resin sealing layer 23 of the second sealing portion 14 covers from the upper surface of the hygroscopic agent layer 16 to the middle of the upper surface side of the side surface of the first sealing unit 19.
- the third resin sealing layer 25 of the third sealing portion 15 covers from the lower surface of the first sealing unit 19 to the middle of the lower surface side of the side surface of the first sealing unit 19.
- the first sealing unit 19 and the hygroscopic agent layer 16 are covered with the second resin sealing layer 23 and the third resin sealing layer 25.
- the organic EL light emitting device 10 has a peripheral seal portion 18 in which the second sealing portion 14 and the third sealing portion 15 are directly bonded around the first sealing unit 19.
- the peripheral seal portion 18 is a portion where the second resin sealing layer 23 and the third resin sealing layer 25 are in direct contact with each other without the first sealing unit 19 interposed therebetween. Further, the peripheral seal portion 18 is provided over the entire periphery in the side surface direction of the first sealing unit 19.
- the second resin sealing layer 23 and the third resin sealing layer 25 are in close contact with the first sealing unit 19 and the hygroscopic agent layer 16, so that the second resin sealing layer 23 and the third resin sealing layer are sealed. It is preferable that no gap is provided between the layer 25 and the first sealing unit 19 and the hygroscopic agent layer 16. Further, in the peripheral seal portion 18, the second resin sealing layer 23 and the third resin sealing layer 25 are in close contact and integrated, and between the second resin sealing layer 23 and the third resin sealing layer 25. It is preferable that no gap is provided. Thus, it is preferable that the organic EL light emitting device 10 does not have a gap in the inside sealed by the second sealing portion 14 and the third sealing portion 15.
- the second sealing substrate 24 and the third sealing substrate 26 are directly connected to each other at the peripheral seal portion 18 via the second resin sealing layer 23 and the third resin sealing layer 25. Be joined.
- the entire periphery in the side surface direction of the first sealing unit 19 is sealed by the second sealing portion 14 and the third sealing portion 15.
- the first sealing unit 19 and the hygroscopic agent layer 16 are sealed by the second sealing portion 14 and the third sealing portion 15 that are joined around the entire circumference in the side surface direction of the first sealing unit 19.
- the FPC 17 drawn out of the first sealing portion 13 is sandwiched between the second sealing portion 14 and the third sealing portion 15 on the connection side with the organic EL element 12. Then, the FPC 17 is drawn out from between the second sealing portion 14 and the third sealing portion 15 through the peripheral seal portion 18.
- the laminate of the first sealing unit 19 having the organic EL element 12 and the hygroscopic agent layer 16 is completely covered by the second resin sealing layer 23 and the third resin sealing layer 25. It has been broken. And the laminated body of the 1st sealing unit 19 and the hygroscopic agent layer 16 remove
- the organic EL light emitting device 10 includes the inner sealing portion including the first sealing portion 13 and the outer sealing portion including the second sealing portion 14 and the third sealing portion 15.
- a double sealing portion is provided for the organic EL element 12.
- the hygroscopic agent layer 16 is provided between the inner sealing portion and the outer sealing portion. That is, the hygroscopic agent layer 16 is provided not on the inner sealing portion where the organic EL element 12 is disposed but on the outer side of the inner sealing portion. The hygroscopic agent layer 16 is sealed by the outer sealing portion together with the first sealing unit 19 having the organic EL element 12.
- hygroscopic agent layer 16 may be provided outside the inner sealing portion, another hygroscopic agent layer may be provided in the inner sealing portion together with the hygroscopic agent layer 16. Moreover, the hygroscopic agent layer may be provided in positions other than these.
- the hygroscopic layer 16 is disposed outside the inner sealing portion (first sealing portion 13), and the hygroscopic layer 16 is disposed together with the inner sealing portion (first sealing portion 13).
- the outer sealing portions the second sealing portion 14 and the third sealing portion 15
- an intrusion route of moisture from the outside into the organic EL light emitting device 10 and a route until the invaded moisture reaches the organic EL element 12 will be considered.
- the side leak is intrusion of moisture into the organic EL light emitting device 10 from the second resin sealing layer 23 and the third resin sealing layer 25 exposed at the end of the peripheral seal portion 18.
- the back intrusion is intrusion of moisture that has passed through the second sealing substrate 24 into the organic EL light emitting device 10.
- the light-emitting surface intrusion is an intrusion of moisture that has passed through the third sealing substrate 26 into the organic EL light-emitting device 10.
- Moisture due to side leakage, back surface intrusion, and light emitting surface intrusion is mainly in the second resin sealing layer 23 and the third resin sealing layer 25 in the second sealing portion 14 and the third sealing portion 15. Spread. Then, the water that has diffused and moved in the second resin sealing layer 23 and the third resin sealing layer 25 and has reached the first sealing unit 19 enters the first sealing unit 19.
- the moisture that has entered the first sealing unit 19 mainly diffuses in the first resin sealing layer 21. And the water
- the moisture that affects the organic EL element 12 enters the second sealing portion 14 and the third sealing portion 15 from the outside of the organic EL light emitting device 10, and the second sealing. It is thought that it has the 2nd step which penetrate
- FIG. 1 the 2nd step which penetrate
- the gap between the barrier film and the organic EL element is not embedded with a sealing resin or the like, and the organic EL element is covered with a gap.
- invaded in the barrier film has a high freedom degree of spreading
- the space between these barrier films is not embedded, so that moisture that has penetrated into the outer barrier film diffuses freely in the gap and is absorbed by the hygroscopic agent. It easily penetrates into the inner barrier film. As a result, the function of the hygroscopic layer is not sufficiently exhibited, and the influence on the organic EL element due to the moisture reaching the organic EL element occurs.
- a hygroscopic layer is disposed on the resin sealing layer, and a sealing substrate is provided to cover the hygroscopic layer.
- the hygroscopic agent layer is arrange
- this organic EL light emitting device is provided with only the sealing part in which this hygroscopic agent layer is arranged, and does not have a configuration for suppressing the intrusion of moisture into the sealing part. For this reason, the penetration
- the moisture absorbent layer is disposed in the same sealing portion as the organic EL element, similarly to the configuration described in Patent Document 2 described above. It does not have an external structure that suppresses the entry of moisture. For this reason, the penetration
- the organic EL light emitting device 10 can secure a high barrier property by the second sealing substrate 24 and the third sealing substrate 26, the back surface intrusion and the light emitting surface intrusion are very small.
- the inner sealing portion composed of the first sealing unit 19 is sealed with the outer sealing portion composed of the second sealing portion 14 and the third sealing portion 15, and the sealing portion is doubled. Is provided. For this reason, the movement path
- the first resin sealing layer 21, the second resin sealing layer 23, and the third resin sealing layer 25 can suppress moisture diffusion, and these resin sealing layers It is difficult for moisture to move inside. For this reason, even when moisture enters the second resin sealing layer 23 and the third resin sealing layer 25 due to the above-described side leak, back surface penetration, and light emitting surface penetration, the second resin sealing layer 23 and the second resin sealing layer 23 The progress of moisture in the three-resin sealing layer 25 is significantly slowed down, and the arrival of moisture in the first sealing unit 19 can be further slowed down. Furthermore, even when moisture reaches the first sealing unit 19, the progress of moisture can be significantly delayed by the first resin sealing layer 21.
- the progress of the invading water can be significantly delayed by the resin sealing layer. Therefore, it is possible to suppress the influence on the organic EL element 12 due to moisture entering from the outside of the organic EL light emitting device 10.
- the hygroscopic agent layer 16 is disposed outside the first sealing portion 13, so that the second sealing portion 14 and the third sealing portion are externally provided from the organic EL light emitting device 10. Moisture that penetrates into the water 15 can be absorbed by the moisture absorbent layer 16. Specifically, before the moisture that has entered the second resin sealing layer 23 or the third resin sealing layer 25 reaches the first sealing unit 19, the second resin sealing layer 23 and the third resin sealing layer 23 are sealed. Moisture diffusing in the stopper layer 25 can be captured by the hygroscopic agent layer 16.
- the hygroscopic agent layer 16 and the first sealing portion 13 are disposed between the second resin sealing layer 23 and the third resin sealing layer 25 and the organic EL element 12. And a flexible substrate 11. Therefore, moisture (back surface intrusion) from the second resin sealing layer 23 and the third resin sealing layer 25 to the organic EL element 12 through the first sealing substrate 22 of the first sealing portion 13 is moisture absorption. Since it is trapped on the entire surface of the agent layer 16, intrusion is prevented.
- the penetration of moisture (light-emitting surface intrusion) from the second resin sealing layer 23 and the third resin sealing layer 25 into the organic EL element 12 through the light-emitting surface side is blocked by the flexible substrate 11.
- the path to the first resin sealing layer 21 is also the second resin sealing layer 23 and the third resin sealing against moisture intrusion (side leak) from the side surface of the first resin sealing layer 21. Since only the side surface of the first sealing unit 19 sealed with the layer 25 is used, the movement path of moisture is complicated. As described above, since the movement path of moisture for entering the first sealing unit 19 is complicated, the residence time of moisture in the second resin sealing layer 23 and the third resin sealing layer 25 is increased. become longer. And since the residence time becomes long, moisture that has diffused into the second resin sealing layer 23 and the third resin sealing layer 25 is allowed to enter the first sealing unit 19 before the moisture absorbent layer 16. Can be captured at.
- the organic EL light emitting device 10 includes the hygroscopic agent layer 16 and the inner sealing portion (first sealing portion 13) together with the outer sealing portions (second sealing portion 14 and third sealing portion 15). ),
- the hygroscopic layer 16 can be made to work efficiently with respect to the intruded moisture. And by this structure, the influence of the water
- FIG. 2 shows the configuration of the organic EL light emitting device of the second embodiment.
- An organic EL light emitting device 10 ⁇ / b> A illustrated in FIG. 2 includes an organic EL element 12 on a flexible substrate 11. And the 1st sealing part 13 for sealing the organic EL element 12 is provided, and the moisture absorbent layer 16A which covers the upper surface and side surface of this 1st sealing part 13 is provided. Moreover, the 2nd sealing part 14 and the 3rd sealing part 15 which seal the flexible base material 11, the organic EL element 12, the 1st sealing part 13, and the hygroscopic agent layer 16A are provided. Further, an FPC (Flexible Printed Circuits) 17 is provided for leading each electrode of the organic EL element 12 to the outside of the second sealing portion 14 and the third sealing portion 15.
- FPC Flexible Printed Circuits
- the organic EL light emitting device 10A shown in FIG. 2 differs from the organic EL light emitting device of the first embodiment only in the configuration relating to the hygroscopic agent layer 16A, and other configurations are the same as those of the first embodiment described above. . Therefore, in the following description, only the configuration related to the hygroscopic agent layer 16A will be described, and description of other configurations will be omitted.
- the hygroscopic agent layer 16 ⁇ / b> A is provided at a position covering the top surface to the side surface of the first sealing unit 19. That is, from the surface opposite to the first resin sealing layer 21 of the first sealing substrate 22 (hereinafter referred to as the first sealing substrate 22 or the first sealing portion 13), the first resin sealing is performed.
- a hygroscopic agent layer 16 ⁇ / b> A is provided so as to continuously cover up to the laminated surface side of the layer 21 and the first sealing substrate 22 (hereinafter, the side surface of the first sealing portion 13).
- the entire side surface of the first sealing portion 13 may be covered with the hygroscopic agent layer 16 ⁇ / b> A. Up to the middle of the side surface may be covered with the hygroscopic agent layer 16A. Moreover, the hygroscopic agent layer 16 ⁇ / b> A that covers the side surface of the first sealing portion 13 may be in contact with the flexible base material 11 or may not be in contact therewith. On the first sealing portion 13, the entire surface may not be covered with the hygroscopic agent layer 16A, but the entire surface is preferably covered with the hygroscopic agent layer 16A.
- the hygroscopic agent layer 16 ⁇ / b> A is continuously provided on the first sealing portion 13 and the side surface of the first sealing portion 13, but on the first sealing portion 13 and the first sealing portion.
- the moisture absorbent layer 16 ⁇ / b> A may be discontinuous with the side surface of the portion 13.
- the hygroscopic agent layer 16 ⁇ / b> A that covers the first sealing portion 13 and the hygroscopic agent layer 16 ⁇ / b> A that covers the side surface of the first sealing portion 13 may be provided separately.
- the hygroscopic layer 16A may be formed so as to be in direct contact with the first sealing unit 19 or may be bonded to the first sealing unit 19 with an adhesive layer or the like. Even if another configuration is provided between the hygroscopic agent layer 16 ⁇ / b> A and the first sealing unit 19, the hygroscopic agent layer 16 may be disposed outside the first sealing unit 19.
- the moisture absorbent layer 16 ⁇ / b> A covers up to the side surface of the first sealing portion 13, whereby moisture can be prevented from entering the first sealing unit 19 due to side leakage.
- the first sealing unit 19 since the first sealing substrate 22 is covered with the hygroscopic agent layer 16 ⁇ / b> A, it is considered that there is very little intrusion of moisture (back surface intrusion) that passes through the first sealing substrate 22. .
- the flexible base material 11 is comprised with the gas barrier film, it is thought that the penetration
- moisture content in the 1st sealing part 13 by side leak can be suppressed, and the reliability of 10 A of organic electroluminescent light-emitting devices improves.
- the hygroscopic layer 16A covers the area from the upper surface to the side surface of the first sealing portion 13, so that the formation area of the hygroscopic layer 16A is smaller than that formed only on the upper surface of the first sealing portion 13. Can be bigger. That is, since the volume of the hygroscopic layer 16A can be increased at an allowable thickness, the hygroscopic capacity of the hygroscopic layer 16A can be increased.
- the expansion of the moisture absorption capacity of the moisture absorbent layer 16A leads to an increase in the time until the moisture absorbent layer 16A is deactivated.
- the hygroscopic agent layer 16A is disposed outside the first sealing unit 19, and the first sealing unit 19 and the hygroscopic agent layer 16A are connected to the second sealing portion 14 and the third sealing portion.
- the sealing part 15 By sealing with the sealing part 15, the hygroscopic function of the hygroscopic agent layer 16A is sufficiently exhibited.
- the increase in the capacity of the hygroscopic agent layer 16 ⁇ / b> A tends to have a great influence on the time until the influence of moisture on the organic EL element 12 occurs. Therefore, by increasing the area of the hygroscopic agent layer 16A, it is possible to increase the time until the deactivation of the hygroscopic agent layer 16A, leading to an improvement in the reliability of the organic EL light emitting device 10A.
- FIG. 3 shows the configuration of the organic EL light emitting device of the third embodiment.
- An organic EL light emitting device 10B shown in FIG. 3 includes an organic EL element 12 on a flexible substrate 11B. And the 1st sealing part 13 for sealing the organic EL element 12 is provided. Furthermore, an adhesive layer 27 that covers the upper surface and side surfaces of the first sealing portion 13 and covers the flexible base material 11B, and the adhesive layer 27 allows the first sealing portion 13 and the flexible substrate to be covered.
- a hygroscopic layer 16B bonded to the material 11B is provided.
- the 2nd sealing part 14 which seals the flexible base material 11B, the organic EL element 12, the 1st sealing part 13, the adhesive bond layer 27, and the hygroscopic agent layer 16B, and a 3rd sealing part 15.
- an FPC (Flexible Printed Circuits) 17 is provided for leading each electrode of the organic EL element 12 to the outside of the second sealing portion 14 and the third sealing portion 15.
- the organic EL light emitting device 10B shown in FIG. 3 has only the configuration relating to the flexible substrate 11B, the adhesive layer 27, and the hygroscopic agent layer 16B, and the organic EL of the first embodiment and the second embodiment described above. Unlike the light emitting device, other configurations are the same as those in the first and second embodiments described above. Therefore, in the following description, only the configuration related to the flexible substrate 11B, the adhesive layer 27, and the hygroscopic agent layer 16B will be described, and description of other configurations will be omitted.
- the area of the main surface on which the organic EL element 12 of the flexible base material 11B is mounted is larger than that of the first sealing portion 13. For this reason, on the surface of the flexible base material 11 ⁇ / b> B, there is an edge region 28 where the first resin sealing layer 21 is not provided around the first sealing portion 13.
- the edge region 28 may be provided over the entire periphery of the first sealing portion 13 on the surface of the flexible base material 11B, and is provided only in a part of the periphery of the first sealing portion 13. May be.
- the adhesive layer 27 is formed on the upper surface of the first sealing portion 13 provided on the flexible substrate 11B, the side surface of the first sealing portion 13, and the edge region 28 of the flexible substrate 11B. It is provided continuously. Then, the hygroscopic layer 16B passes through the adhesive layer 27 from the upper surface of the first sealing portion 13 to the side surface of the first sealing portion 13 and the edge region 28 around the first sealing portion 13. It is bonded on the flexible substrate 11B.
- the adhesive layer 27 and the hygroscopic layer 16B cover the upper surface and the side surface of the first sealing portion 13 and do not cover the entire edge region 28 as long as the edge region 28 of the flexible base material 11B is reached. Also good.
- the hygroscopic layer 16B covers at least a part of the upper surface of the first sealing part 13 and at least a part of the side surface of the first sealing part 13, and the edge region 28 of the flexible base material 11B. It is sufficient that at least a part is covered.
- the hygroscopic agent layer 16B is provided on the entire upper surface of the first sealing portion 13.
- the hygroscopic layer 16B is preferably provided on the entire side surface, and the hygroscopic layer 16B is preferably provided on the entire edge region 28.
- the adhesive layer 27 may be discontinuous in the upper surface and the side surface of the first sealing portion 13 and the edge region 28 of the flexible base material 11B. Since it is preferable not to have a void having a high degree of freedom of moisture diffusion, the adhesive layer 27 is continuously provided from the upper surface of the first sealing portion 13 to the edge region 28 of the flexible base material 11B. Preferably it is.
- the adhesive layer 27 is used for bonding the hygroscopic layer 16 ⁇ / b> B, but without using the adhesive layer 27, the hygroscopic layer 16 ⁇ / b> B is the upper surface of the first sealing portion 13. And it may be provided directly on the side surface and the edge region 28 of the flexible substrate 11B. Further, the adhesive layer 27 is only a part between the hygroscopic layer 16B and the flexible base material 11B and the first sealing portion 13, for example, only on the first sealing substrate 22 or only the edge region 28. May be provided. Furthermore, instead of the adhesive layer 27, another layer for adhering the hygroscopic layer 16B may be provided.
- the moisture path for moving from the second resin sealing layer 23 and the third resin sealing layer 25 to the first sealing portion is the first and second embodiments described above. More complicated than form. Specifically, the first resin sealing layer 21 exposed on the side surface of the first sealing portion 13 is covered with the adhesive layer 27 and the hygroscopic agent layer 16B. For this reason, the side leak of the 1st sealing part 13 becomes the main penetration
- the movement path of moisture from the second resin sealing layer 23 and the third resin sealing layer 25 to the first resin sealing layer 21 can be further limited. Intrusion of moisture into the one sealing portion 13 can be suppressed.
- the moisture that has entered the adhesive layer 27 can move to the first sealing portion by diffusing in the adhesive layer 27.
- the adhesive layer 27 is less likely to move moisture than in the gap, so that the moisture retention time in the adhesive layer 27 can be increased.
- the adhesive layer 27 and the hygroscopic layer 16 ⁇ / b> B are directly connected from the end exposed between the hygroscopic layer 16 ⁇ / b> B into which moisture enters and the flexible substrate 11 ⁇ / b> B to the inside of the edge region 28. Touching. Therefore, the moisture that has entered the adhesive layer 27 is likely to be captured by the hygroscopic agent layer 16 ⁇ / b> B while staying in the edge region 28.
- the side leak in the first sealing unit 19 is considered to be the penetration of moisture at the interface between the flexible base material 11 ⁇ / b> B and the first resin sealing layer 21 together with the penetration of moisture from the first resin sealing layer 21. It is done.
- the interface between the flexible substrate 11B and the first resin sealing layer 21 is not completely integrated microscopically and is not formed with a continuous composition. For this reason, moisture may enter through the interface between the flexible substrate 11 ⁇ / b> B and the first resin sealing layer 21.
- the interface between the flexible substrate 11B and the first resin sealing layer 21 is covered with the adhesive layer 27 and the hygroscopic layer 16B. Moisture entering through the interface between the base material 11B and the first resin sealing layer 21 can also be suppressed. In the configuration of the organic EL light emitting device 10B, moisture that has entered the interface between the adhesive layer 27 and the flexible base material 11B is easily captured by the hygroscopic layer 16B in the marginal region 28.
- the moisture retention time in the marginal region 28 is affected by the length of the marginal region 28. That is, the longer the edge region 28 is, the longer the moisture retention time in the adhesive layer 27 in the edge region 28 is. For this reason, by increasing the length of the marginal region 28, the moisture retention time can be lengthened, and the moisture trapping probability by the hygroscopic agent layer 16B can be increased.
- the thickness of the adhesive layer 27 in the marginal region 28 affects the intrusion of moisture from the end of the adhesive layer 27 and the probability of moisture capture by the hygroscopic layer 16B. That is, by reducing the thickness of the adhesive layer 27 in the edge region 28, it is possible to suppress moisture from entering from the end of the adhesive layer 27. Further, by reducing the thickness of the adhesive layer 27, moisture in the adhesive layer 27 and at the interface between the adhesive layer 27 and the flexible substrate 11B can be easily absorbed by the hygroscopic layer 16B in the edge region 28. Easy to be captured.
- the movement of moisture to the first sealing portion 13 can be suppressed by enlarging the marginal region 28 and thinning the adhesive layer 27 in the marginal region 28, and moisture to the organic EL element 12.
- the influence of can be suppressed.
- the reliability of the organic EL light emitting device 10B is improved by enlarging the edge region 28 and making the adhesive layer 27 thin.
- the flexible substrate is not particularly limited as long as it has high light transmittance.
- a resin substrate, a resin film, and the like are preferable, but a transparent resin film is preferably used from the viewpoints of productivity and performance such as lightness and flexibility.
- the resin that can be used as the flexible substrate is not particularly limited.
- the flexible substrate may be an unstretched film or a stretched film.
- the flexible substrate has high transparency because the transparent electrode can be used as the transparent electrode of the electronic device.
- High transparency means that the total light transmittance in the visible light wavelength region measured by a method based on JIS K 7361-1: 1997 (plastic-transparent material total light transmittance test method) is 50% or more. This is more preferably 80% or more.
- a flexible base material is a gas barrier film provided with a gas barrier layer.
- the flexible substrate has a water vapor transmission rate (25 ⁇ 0.5 ° C., relative humidity 90 ⁇ 2% RH) measured by a method according to JIS K 7129-1992, of 0.01 g / (m 2 ⁇ 24h)
- the following gas barrier film also referred to as a gas barrier film or the like is preferable.
- the oxygen permeability measured by a method according to JIS K 7126-1987 is 1 ⁇ 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less, and the water vapor permeability is 1 ⁇ 10 ⁇ It is preferably 5 g / (m 2 ⁇ 24 h) or less.
- the gas barrier layer constituting the flexible substrate is not particularly limited, and a known gas barrier layer can be applied as long as the gas barrier property can be realized.
- a flexible base material is not a gas barrier film, it is preferable to provide the gas barrier layer which can implement
- the organic EL element includes a transparent electrode and a counter electrode, and an organic EL layer is provided as an organic functional layer between the electrodes.
- the organic EL layer refers to a light emitting unit including an organic layer containing at least various organic compounds.
- the organic EL layer is sandwiched between a pair of electrodes composed of an anode and a cathode, and emits light by recombination of the supplied holes and electrons in the organic EL layer.
- the organic EL element may include a plurality of organic EL layers according to a desired emission color.
- the layer structure of the organic EL element is not limited and may be a general layer structure.
- the configuration of [hole injection layer / hole transport layer / organic EL layer / electron transport layer / electron injection layer] can be exemplified.
- the hole injection layer and the hole transport layer may be provided as a hole transport injection layer.
- the electron transport layer and the electron injection layer may be provided as an electron transport injection layer.
- the electron injection layer may be made of an inorganic material.
- the organic EL element may be an element having a so-called tandem structure in which a plurality of organic EL layers including at least one organic EL layer are stacked.
- Specific examples of the tandem organic EL element include, for example, US Pat. No. 6,337,492, US Pat. No. 7,420,203, US Pat. No. 7,473,923, US Pat. No. 6,872,472, US Pat. No. 6,107,734. Specification, U.S. Pat. No. 6,337,492, International Publication No.
- JP-A-2006-228712 JP-A-2006-24791, JP-A-2006-49393, JP-A-2006-49394 JP-A-2006-49396
- JP-A-2011-96679 JP-A-2005-340187, JP-A-4711424, JP-A-3496868, JP-A-3848564, JP-A-4421169, JP 2010-192719, JP 009-076929, JP 2008-078414, JP 2007-059848, JP 2003-272860, JP 2003-045676, WO 2005/094130, etc.
- Examples of the structure and constituent materials are given.
- the hygroscopic layer includes a hygroscopic compound.
- a hygroscopic compound For example, the structure only by a hygroscopic compound, the structure which disperse
- a sheet-like moisture absorbent layer can be used as the moisture absorbent layer.
- a sheet-like hygroscopic layer in which a hygroscopic layer containing a binder resin and a hygroscopic compound is formed on a support can also be used.
- the hygroscopic compound can be used without particular limitation as long as it is a compound having a moisture adsorption function.
- the hygroscopic compound is preferably a compound that can chemically adsorb moisture and maintains a solid state even after moisture is adsorbed.
- hygroscopic compounds used in the hygroscopic layer include metal oxides (for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide, etc.), sulfates (for example, lithium sulfate, sodium sulfate, sulfuric acid).
- metal oxides for example, sodium oxide, potassium oxide, calcium oxide, barium oxide, magnesium oxide, aluminum oxide, etc.
- sulfates for example, lithium sulfate, sodium sulfate, sulfuric acid.
- anhydrous salts are preferably used in sulfates, metal halides and perchloric acids.
- hygroscopic silica powder, molecular sieve powder and the like can also be used as the hygroscopic compound.
- the hygroscopic compound at least one selected from alkaline earth metals, alkali metals, alkaline earth metal oxides, alkali metal oxides, and inorganic porous materials is preferably used. Furthermore, it is preferable to use hygroscopic particles containing one or more hygroscopic compounds selected from these, or particles of one or more hygroscopic compounds selected from these.
- the moisture absorbent component does not inhibit the moisture adsorption action, and it is preferable to use a material having high gas permeability.
- the binder resin include polymer materials such as polyolefin-based, polyacryl-based, polyacrylonitrile-based, polyamide-based, polyester-based, epoxy-based, polycarbonate-based, and fluorine-based materials.
- the hygroscopic layer comprises a hygroscopic compound and a binder resin
- the hygroscopic layer preferably contains 95 to 60% by mass of the hygroscopic compound and 5 to 40% by mass of the binder resin.
- the sealing substrate is a member that covers each sealing portion that seals the organic EL element, and is fixed to a flexible base material or the like by a resin sealing layer. Further, the sealing substrate is not limited to a plate shape, and may be a film shape or the like.
- the same structure may be applied to the first sealing substrate, the second sealing substrate, and the third sealing substrate used in the organic EL light emitting device of the above-described embodiment, and each is different.
- a configuration may be applied.
- substrate used as the light extraction side in an organic electroluminescent light-emitting device is transparent like a flexible base material.
- the sealing substrate a conventionally used substrate for sealing an organic EL element can be applied.
- a glass substrate, a polymer substrate, a metal substrate, etc. are mentioned.
- the glass substrate include soda-lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
- the polymer substrate include polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, and polysulfone.
- the metal substrate examples include one or more metals selected from stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicon, germanium, and tantalum, or alloys containing these metals. .
- a polymer substrate or a metal substrate as a sealing substrate in the form of a thin film.
- the sealing substrate may be processed into a concave plate shape. In this case, the material of the sealing substrate described above is subjected to processing such as sand blasting and chemical etching to form a concave structure on the sealing substrate.
- the sealing substrate has an oxygen transmission rate measured by a method according to JIS K 7126-1987 of 1 ⁇ 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less, and a method according to JIS K 7129-1992. It is preferable that the water vapor permeability (25 ⁇ 0.5 ° C., relative humidity (90 ⁇ 2)% RH) measured in (1) is 1 ⁇ 10 ⁇ 3 g / (m 2 ⁇ 24 h) or less.
- the resin sealing layer is used as a sealing agent for fixing the sealing substrate to a flexible base material or the like and sealing the organic EL element. Note that the same configuration is applied to each of the first resin sealing layer, the second resin sealing layer, and the third resin sealing layer used in the organic EL light emitting device of the above-described embodiment. Alternatively, different configurations may be applied. However, it is preferable that the 3rd resin sealing layer used as the light extraction side in an organic electroluminescent light-emitting device is transparent like a flexible base material.
- a resin used for sealing a conventionally known organic EL element can be applied.
- an acrylic acid oligomer, a photocuring and thermosetting adhesive having a reactive vinyl group of a methacrylic acid oligomer, or a moisture curable adhesive such as 2-cyanoacrylate can be used.
- fever and chemical curing types (two-component mixing), such as an epoxy type can be used.
- hot melt type polyamide, polyester, and polyolefin can be used.
- a cationic curing type ultraviolet curing epoxy resin adhesive can be used.
- the resin sealing layer may be applied to the sealing substrate using a commercially available dispenser like screen printing.
- the organic material which comprises an organic EL element may deteriorate with heat processing.
- the resin sealing layer is preferably one that can be adhesively cured at room temperature (25 ° C.) to 80 ° C.
- a desiccant may be dispersed in the resin sealing layer.
- the same adhesive as the above-described resin sealing layer can be used as the adhesive layer.
- an adhesive layer is used, an adhesive is applied to one surface of the moisture absorbent layer, for example, the support side of the sheet-like moisture absorbent layer, and the moisture absorbent layer coated with the adhesive is pasted on the first sealing unit. Match. Or an adhesive agent is apply
- the adhesive bond layer which bonds a 1st sealing unit and a hygroscopic agent layer between a 1st sealing unit and a hygroscopic agent layer is provided.
- the manufacturing method of the organic EL light emitting device 10 includes a step of manufacturing the organic EL element 12, a step of sealing the organic EL element 12 with the first sealing portion 13 and the flexible substrate 11 (first sealing unit 19). Forming the hygroscopic agent layer 16 on the first sealing portion 13, and the first sealing unit 19 and the hygroscopic agent layer 16 in the second sealing portion 14 and the third sealing portion 15. And a step of sealing.
- the manufacturing method of the organic EL light-emitting device 10 may include processes other than these as needed.
- the organic EL element 12 is produced on the flexible base material 11.
- a transparent electrode is formed on the prepared flexible substrate 11 by an appropriate film forming method such as a vapor deposition method or a sputtering method.
- an organic EL layer is formed by sequentially forming a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.
- a film forming method of each of these layers there are a spin coat method, a cast method, an ink jet method, a vapor deposition method, a printing method, etc., but from the point that a uniform film is easily obtained and pinholes are difficult to generate, etc.
- Vacuum deposition or spin coating is particularly preferred. Different methods may be used for forming each layer. Furthermore, after forming the organic EL layer, a counter electrode is formed on the upper portion by an appropriate film forming method such as a vapor deposition method or a sputtering method. In addition, the transparent electrode and the counter electrode each have an external connection terminal on the edge of the flexible substrate 11 while maintaining an insulating state. And FPC17 is joined to this external connection terminal.
- Step of forming the first sealing unit the organic EL element 12 provided on the flexible substrate 11 is sealed with the first sealing portion 13.
- a resin layer for forming the first resin sealing layer 21 is provided on one surface of the first sealing substrate 22 to prepare a substrate with a first resin for forming the first sealing portion 13.
- substrate with 1st resin is bonded so that the resin layer side of the board
- the resin layer is cured by heating or the like. Thereby, the organic EL element 12 is covered with the first resin sealing layer 21 to form the first sealing unit 19 sealed with the first sealing portion 13 and the flexible base material 11.
- the hygroscopic agent layer 16 is formed on the first sealing portion of the first sealing unit 19.
- a layer containing a hygroscopic compound is provided on the first sealing substrate 22 of the first sealing portion 13.
- a composition in which the resin binder and the hygroscopic compound are mixed is applied on the first sealing substrate 22 with a necessary thickness. To do.
- a composition in which a resin binder and a hygroscopic compound are mixed. Is applied from the upper surface to the side surface of the first sealing unit 19 with a required thickness.
- the sheet-like hygroscopic agent layer 16 ⁇ / b> A is provided from the upper surface to the side surface of the first sealing unit 19.
- an adhesive layer for bonding the sheet-like hygroscopic layer 16A may be formed.
- the hygroscopic layer 16B is provided from the upper surface and side surface of the first sealing portion 13 to the edge region 28 of the flexible substrate 11B via the adhesive layer 27.
- the hygroscopic layer 16B is formed by laminating the sheet-shaped hygroscopic layer with the adhesive layer 27.
- a composition in which a resin binder and a hygroscopic compound are mixed is applied to the flexible base material 11B from the upper surface and side surfaces of the first sealing portion 13. It coat
- Step of sealing the first sealing unit and the hygroscopic layer with the second sealing portion and the third sealing portion Next, the first sealing unit 19 and the hygroscopic agent layer 16 are sealed with the second sealing portion 14 and the third sealing portion 15.
- a resin layer for forming the second resin sealing layer 23 is provided on one surface of the second sealing substrate 24, and a substrate with a second resin for forming the second sealing portion 14 is prepared.
- a resin layer for forming the third resin sealing layer 25 is provided on one surface of the third sealing substrate 26, and a substrate with a third resin for forming the third sealing portion 15 is prepared. To do.
- the resin layer of the substrate with the second resin and the resin layer of the substrate with the third resin are arranged to face each other, and the hygroscopic layer 16 is provided between the substrate with the second resin and the substrate with the third resin.
- the first sealing unit 19 is disposed. At this time, it arrange
- the substrate with the second resin and the substrate with the third resin are pressure-bonded so as to sandwich the first sealing unit 19 provided with the hygroscopic agent layer 16. Accordingly, the substrate with the second resin is bonded to the hygroscopic agent layer 16 and the side surface of the first sealing portion 13. Further, the substrate with the third resin is bonded to the back surface of the flexible base material 11 and the side surface of the first sealing portion 13. Similarly, in the peripheral seal portion 18, the substrate with the second resin and the substrate with the third resin are bonded together.
- the respective resin layers are cured by heating or the like to form the second resin sealing layer 23 and the third resin sealing layer 25. .
- the 2nd sealing part 14 and the 3rd sealing part 15 which seal the 1st sealing unit 19 and the hygroscopic agent layer 16 are produced.
- the organic EL light emitting device 10 can be manufactured through the above steps.
- the process from the formation of the organic EL element 12 to the sealing by the second sealing portion 14 and the third sealing portion 15 can be performed consistently with a single vacuum. preferable. Also when taking out from the vacuum atmosphere in the middle, it is preferable to be in a dry inert gas atmosphere.
- the second sealing portion is directly connected to the edge portion of the flexible base material, and the organic EL element, the first sealing portion, and the hygroscopic agent are formed only by the flexible base material and the second sealing portion.
- a configuration in which the layers are sealed is also possible.
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Abstract
Description
なお、説明は以下の順序で行う。
1.有機エレクトロルミネッセンス発光装置の第1実施形態
2.有機エレクトロルミネッセンス発光装置の第2実施形態
3.有機エレクトロルミネッセンス発光装置の第3実施形態
4.有機エレクトロルミネッセンス発光装置の構成要素
以下本発明の有機エレクトロルミネッセンス発光装置(以下、有機EL発光装置)の具体的な実施の形態について説明する。図1に、本実施の形態の有機EL発光装置の概略構成図を示す。なお、図1に示す有機EL発光装置は、発光を基材側から取出すボトムエミッション型の有機エレクトロルミネッセンス素子(以下、有機EL素子)を備える構成である。
次に、有機EL発光装置の第2実施形態について説明する。図2に、第2実施形態の有機EL発光装置の構成を示す。図2に示す有機EL発光装置10Aは、可撓性基材11上に、有機EL素子12を備える。そして、有機EL素子12を封止するための第1封止部13を備え、この第1封止部13の上面と側面とを覆う吸湿剤層16Aを備える。また、可撓性基材11、有機EL素子12、第1封止部13、及び、吸湿剤層16Aを封止する、第2封止部14と、第3封止部15とを備える。さらに、有機EL素子12の各電極を第2封止部14及び第3封止部15の外部に導出するための、FPC(Flexible Printed Circuits)17を備える。
次に、有機EL発光装置の第3実施形態について説明する。図3に、第3実施形態の有機EL発光装置の構成を示す。図3に示す有機EL発光装置10Bは、可撓性基材11B上に、有機EL素子12を備える。そして、有機EL素子12を封止するための第1封止部13を備える。さらに、第1封止部13の上面と側面とを覆い、可撓性基材11B上までを覆う接着剤層27と、この接着剤層27により、第1封止部13及び可撓性基材11Bに貼り合わされた吸湿剤層16Bを備える。また、可撓性基材11B、有機EL素子12、第1封止部13、接着剤層27、及び、吸湿剤層16Bを封止する、第2封止部14と、第3封止部15とを備える。さらに、有機EL素子12の各電極を第2封止部14及び第3封止部15の外部に導出するための、FPC(Flexible Printed Circuits)17を備える。
以下、上述の第1実施形態から第3実施形態において説明した、有機EL発光装置を構成する各構成要素の詳細について説明する。なお、以下の説明は、各実施形態の有機EL発光装置を構成することが可能な構成要素の一例であり、上述の有機EL発光装置による作用効果を得ることができれば、他の構成を適用することも可能である。
可撓性基材は、高い光透過性を有していれば、特に制限はない。例えば樹脂基板、樹脂フィルム等が好適に挙げられるが、生産性の観点や軽量性と柔軟性といった性能の観点から透明樹脂フィルムを用いることが好ましい。
有機EL素子は、透明電極と、対向電極とを備え、この電極間に有機機能層として有機EL層が設けられている。有機EL層とは、少なくとも各種有機化合物を含有する有機層を含む、発光単位をいう。有機EL層は、陽極と陰極とからなる一対の電極の間に挟持され、供給される正孔(ホール)と電子とが有機EL層内で再結合することにより発光する。なお、有機EL素子は、所望の発光色に応じて、複数の有機EL層を備えていてもよい。
吸湿剤層は、吸湿性化合物を含んで構成される。例えば、吸湿性化合物のみによる構成や、粒子状の吸湿性化合物や吸湿性化合物を含む粒子を、バインダー樹脂中に分散させた構成が挙げられる。また、吸湿剤層としては、シート状の吸湿剤層を用いることができる。支持体上にバインダー樹脂と吸湿性化合物とを含有する吸湿剤層が形成された、シート状吸湿剤層を用いることもできる。
封止基板は、有機EL素子を封止する各封止部を覆う部材であって、樹脂封止層によって可撓性基材等に固定されている。また、封止基板は、板状に限られずフィルム状等の形態であってもよい。
樹脂封止層は、封止基板を可撓性基材等に固定するとともに、有機EL素子を封止するためのシール剤として用いられる。なお、上述の実施形態の有機EL発光装置に用いられている第1の樹脂封止層、第2の樹脂封止層、及び、第3の樹脂封止層は、それぞれ同じ構成が適用されていてもよく、それぞれ異なる構成が適用されていてもよい。但し、有機EL発光装置において光取り出し側となる第3樹脂封止層は、可撓性基材と同様に透明であることが好ましい。
有機EL発光装置において、吸湿剤層の貼り合せに接着剤層を用いる場合、接着剤層としては上述の樹脂封止層と同様の接着剤を用いることができる。接着剤層を用いる場合には、吸湿剤層の一方の面、例えばシート状吸湿剤層の支持体側に接着剤を塗布し、接着剤を塗布した吸湿剤層を第1封止ユニット上に貼り合せる。或いは、第1封止ユニットの吸湿剤層を配置する面に接着剤を塗布し、この接着剤上から吸湿剤層を貼り合せる。これにより、第1封止ユニットと吸湿剤層との間に、第1封止ユニットと吸湿剤層とを貼り合わせる接着剤層が設けられる。
次に、上述の有機EL発光装置の製造方法について説明する。以下の説明では、有機EL発光装置の製造方法の一例として、図1に示す有機EL発光装置10の製造方法について、主に説明する。また、必要に応じて、図2及び図3に示す有機EL発光装置10A,10Bの製造方法についても説明する。
まず、可撓性基材11上に、有機EL素子12を作製する。有機EL素子12の作製は、例えば、準備した可撓性基材11上に、透明電極を、蒸着法やスパッタ法などの適宜の成膜法によって形成する。次に、正孔注入層、正孔輸送層、発光層、電子輸送層、電子注入層の順に成膜して有機EL層を形成する。これらの各層の成膜方法としては、スピンコート法、キャスト法、インクジェット法、蒸着法、印刷法等があるが、均質な膜が得られやすく、かつピンホールが生成しにくい等の点から、真空蒸着法又はスピンコート法が特に好ましい。各層の成膜には、それぞれ異なる方法を用いてもよい。さらに、有機EL層を形成した後、この上部に対向電極を、蒸着法やスパッタ法などの適宜の成膜法によって形成する。また、透明電極と対向電極とは、互いに絶縁状態を保ちつつ、可撓性基材11の縁辺にそれぞれの外部接続端子を作製する。そして、この外部接続端子に、FPC17を接合する。
次に、可撓性基材11上に設けられた有機EL素子12を、第1封止部13で封止する。まず、第1封止基板22の一方の面に、第1樹脂封止層21を形成するための樹脂層を設け、第1封止部13を形成するための第1樹脂付き基板を準備する。そして、第1樹脂付き基板の樹脂層側が可撓性基材11上と有機EL素子12の上面及び側面とを覆うように、第1樹脂付き基板を貼り合せる。貼り合せた後、加熱等によって樹脂層を硬化する。これにより、有機EL素子12が第1樹脂封止層21で覆われ、第1封止部13と可撓性基材11によって封止された第1封止ユニット19を形成する。
次に、第1封止ユニット19の第1封止部上に吸湿剤層16を形成する。吸湿剤層16は、吸湿性化合物を含む層を第1封止部13の第1封止基板22上に設ける。例えば、バインダー樹脂と吸湿性化合物とを含む吸湿剤層16を形成する場合には、樹脂バインダーと吸湿性化合物とを混合した組成物を、第1封止基板22上に必要な厚さで塗布する。
次に、第2封止部14と第3封止部15とで、第1封止ユニット19と吸湿剤層16とを封止する。まず、第2封止基板24の一方の面に、第2樹脂封止層23を形成するための樹脂層を設け、第2封止部14を形成するための第2樹脂付き基板を準備する。同様に、第3封止基板26の一方の面に、第3樹脂封止層25を形成するための樹脂層を設け、第3封止部15を形成するための第3樹脂付き基板を準備する。
なお、上述の実施形態では、第1封止ユニットと吸湿剤層とを、第2封止部と第3封止部とからなる外側の封止部で封止する構造について説明しているが、第1封止ユニットと吸湿剤層とを封止する外側の封止部の構成については、この構成に限定されない。例えば、一方の周辺シール部が無く、第1封止ユニット及び吸湿剤層の発光面側から背面側までを第2樹脂封止層と第2封止基板とが覆う構成とすることで、第2封止部のみにより、第1封止ユニットと吸湿剤層との全体が封止される構成も可能である。また、第2封止部が可撓性基材の縁辺部に直に接続され、可撓性基材と第2封止部とのみによって有機EL素子、第1封止部、及び、吸湿剤層が封止される構成も可能である。
Claims (10)
- 可撓性基材と、
前記可撓性基材上に設けられた有機エレクトロルミネッセンス素子と、
前記可撓性基材上において、前記有機エレクトロルミネッセンス素子を封止する第1封止部と、
前記第1封止部上に設けられた吸湿剤層と、
前記吸湿剤層、及び、前記第1封止部を覆う第2封止部と、を備える
有機エレクトロルミネッセンス発光装置。 - 前記第1封止部が、前記可撓性基材上で前記有機エレクトロルミネッセンス素子の上面及び側面の全面を覆う第1樹脂封止層と、前記第1樹脂封止層によって前記有機エレクトロルミネッセンス素子を介して前記可撓性基材に接合された第1封止基板とを有する請求項1に記載の有機エレクトロルミネッセンス発光装置。
- 前記可撓性基材、前記有機エレクトロルミネッセンス素子、前記第1封止部、及び、前記吸湿剤層を介して、前記第2封止部と接合する第3封止部を備える請求項1に記載の有機エレクトロルミネッセンス発光装置。
- 前記第3封止部が、前記第2封止部、及び、前記可撓性基材に接合する第3樹脂封止層と、前記第3樹脂封止層によって前記第2封止部に接合された第3封止基板とを有する請求項3に記載の有機エレクトロルミネッセンス発光装置。
- 前記吸湿剤層が、前記第1封止基板上から前記第1樹脂封止層の側面までを覆う請求項2に記載の有機エレクトロルミネッセンス発光装置。
- 前記吸湿剤層と前記第1封止部とを接合する接着剤層を有する請求項1に記載の有機エレクトロルミネッセンス発光装置。
- 前記吸湿剤層が、前記第1封止部と、前記可撓性基材とを覆う請求項1に記載の有機エレクトロルミネッセンス発光装置。
- 前記吸湿剤層と前記第1封止部及び前記可撓性基材とを接合する接着剤層を有する請求項7に記載の有機エレクトロルミネッセンス発光装置。
- 前記吸湿剤層が、バインダー樹脂と、吸湿性化合物とを有する請求項1に記載の有機エレクトロルミネッセンス発光装置。
- 前記吸湿性化合物が、アルカリ土類金属、アルカリ金属、アルカリ土類金属の酸化物、アルカリ金属の酸化物、及び、無機多孔質材料から選ばれる少なくとも1種を含む請求項9に記載の有機エレクトロルミネッセンス発光装置。
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EP16889880.7A EP3416459B1 (en) | 2016-02-10 | 2016-09-01 | Organic electroluminescent light emitting device |
CN201680081484.4A CN108605393B (zh) | 2016-02-10 | 2016-09-01 | 有机电致发光发光装置 |
US16/076,169 US10524319B2 (en) | 2016-02-10 | 2016-09-01 | Organic electroluminescent light emitting device |
KR1020187016795A KR102082062B1 (ko) | 2016-02-10 | 2016-09-01 | 유기 일렉트로루미네센스 발광 장치 |
JP2017566503A JP6899502B2 (ja) | 2016-02-10 | 2016-09-01 | 有機エレクトロルミネッセンス発光装置 |
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JP2021015754A (ja) * | 2019-07-16 | 2021-02-12 | パイオニア株式会社 | 発光装置 |
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WO2019073567A1 (ja) * | 2017-10-12 | 2019-04-18 | シャープ株式会社 | ベース層を備えた非可撓性基板、可撓性表示装置及びその製造方法 |
CN109411615B (zh) * | 2018-10-30 | 2022-02-11 | 京东方科技集团股份有限公司 | 有机发光二极管发光装置及其制造方法 |
CN111584745A (zh) * | 2020-05-13 | 2020-08-25 | 深圳市华星光电半导体显示技术有限公司 | 显示面板及其制造方法 |
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JP7290493B2 (ja) | 2019-07-16 | 2023-06-13 | パイオニア株式会社 | 発光装置 |
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JPWO2017138179A1 (ja) | 2018-12-06 |
US10524319B2 (en) | 2019-12-31 |
EP3416459B1 (en) | 2022-03-02 |
US20190150235A1 (en) | 2019-05-16 |
JP6899502B2 (ja) | 2021-07-07 |
CN108605393A (zh) | 2018-09-28 |
EP3416459A4 (en) | 2019-01-02 |
KR20180082565A (ko) | 2018-07-18 |
EP3416459A1 (en) | 2018-12-19 |
KR102082062B1 (ko) | 2020-02-26 |
CN108605393B (zh) | 2021-10-08 |
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