WO2010113727A1 - Organic el element and manufacturing method therefor - Google Patents

Organic el element and manufacturing method therefor Download PDF

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Publication number
WO2010113727A1
WO2010113727A1 PCT/JP2010/055124 JP2010055124W WO2010113727A1 WO 2010113727 A1 WO2010113727 A1 WO 2010113727A1 JP 2010055124 W JP2010055124 W JP 2010055124W WO 2010113727 A1 WO2010113727 A1 WO 2010113727A1
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electrode
organic
light emitting
emitting layer
layer
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PCT/JP2010/055124
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French (fr)
Japanese (ja)
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宮林毅
井上豊和
別所久美
日比野真吾
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ブラザー工業株式会社
東海ゴム工業株式会社
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Publication of WO2010113727A1 publication Critical patent/WO2010113727A1/en

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    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80521—Cathodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80522—Cathodes combined with auxiliary electrodes

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  • the present invention relates to a thin organic EL element and a method for manufacturing the organic EL element.
  • the flat display using the organic EL element has attracted a great deal of attention as the next generation display, and research and development on this has been actively conducted.
  • an organic EL element is used, a high-resolution display having characteristics such as direct current low voltage driving, high viewing angle, and self-luminous emission can be realized, and its utility value is considered to be very high.
  • This organic EL element has a configuration in which, for example, a transparent electrode (anode) / a light emitting layer / a metal electrode (cathode) are laminated on a glass substrate.
  • a material having a high work function is used for the anode, and a material having a low work function is used for the cathode.
  • An organic material is used for the light emitting layer, and holes and electrons injected from both electrodes recombine in the light emitting layer to emit light.
  • the solid organic material used for the light-emitting layer is easily affected by moisture and the like, and when the organic EL element is driven in the air, the light-emitting characteristics are rapidly deteriorated. Therefore, a light emitting layer made of an organic material is sandwiched between a transparent electrode formed on a glass substrate and a counter electrode facing the transparent electrode, and carriers are injected into the light emitting layer from both electrodes to cause the light emitting layer to emit light.
  • a sealing chamber is formed by a sealing glass plate surrounding at least the light emitting layer and the counter electrode, and an inert gas is sealed in the sealing chamber, and a hygroscopic property is provided between the sealing glass plate and the counter electrode.
  • Patent Document 1 discloses a proposal for providing a porous layer to absorb moisture in the element, preventing deterioration of light emission characteristics of the organic EL element, and extending the life of the element.
  • the hygroscopic porous layer is provided on the inner surface of the sealing glass plate, the hygroscopic porous layer is hygroscopic between the hygroscopic porous layer and the counter electrode. It is necessary to provide a certain amount of internal space so that the thickness of the organic EL element can be reduced.
  • the light emitting layer which is the most unaffected by moisture, is hardly exposed in the internal space, moisture that has been mixed in the light emitting layer during the manufacturing process, or from the exposed surface of the light emitting layer between the electrodes. It cannot always be said that effective moisture absorption can be performed with respect to moisture entering the light emitting layer.
  • An object of the present invention is to provide an EL element and a manufacturing method thereof.
  • an organic EL device includes a planar light emitting layer made of an organic light emitting material, and a first formed on one surface of the light emitting layer.
  • An element part composed of a first electrode, a second electrode formed on the other surface of the light emitting layer, and a hygroscopic layer composed of a hygroscopic substance, and an exterior covering and sealing the element part
  • An organic EL element composed of a body, wherein the second electrode has a hole, and the moisture absorption layer is provided on the side where the light emitting layer is provided with respect to the second electrode; Is formed on the opposite surface.
  • An organic EL device is the organic EL element according to the first aspect, wherein the first electrode is an anode that injects holes into the light emitting layer, and the first The second electrode is a cathode for injecting electrons into the light emitting layer.
  • a method for manufacturing an organic EL element comprising: a light emitting layer made of an organic light emitting material; a first electrode formed on one surface of the light emitting layer; and the light emitting layer.
  • a second electrode having a hole formed on the other surface of the first electrode, and a moisture absorption formed on a surface opposite to the side on which the light emitting layer is provided with respect to the second electrode.
  • the second electrode is formed by attaching an electrode film having a hole to the light emitting layer by a laminating method.
  • the light-absorbing layer is formed by forming the light-emitting layer on one surface of the second electrode having a hole and forming the moisture-absorbing layer on the other surface. Since it is close to the light-emitting layer through a hole in the electrode, moisture mixed in the light-emitting layer can be effectively absorbed by the moisture-absorbing layer, and there is no need to provide an internal space for the moisture-absorbing layer to absorb moisture. . As a result, a thin organic EL element with little deterioration and long life can be obtained.
  • the organic EL element according to claim 2 causes the organic EL element to emit light more efficiently by using the first electrode without a hole as an anode. It becomes possible.
  • a material having a higher work function than the cathode can drive the organic EL element more efficiently.
  • a material having a higher work function than the metal electrode is used for the anode, Can make the anode a transparent electrode with a high work function.
  • the second electrode having a hole can be formed more easily and inexpensively by forming the second electrode by a laminating method.
  • FIG. 3 is a longitudinal sectional view of a central portion of the organic EL element 1, and is a sectional view taken along line AA ′ of FIG. It is a top view of the organic EL element 1 which removed the upper sealing film 21.
  • FIG. It is a longitudinal cross-sectional view of the electrode film 31 required during manufacture of the organic EL element 1.
  • FIG. 3 is a flowchart showing manufacturing steps of the organic EL element 1. It is a flowchart which shows the 2nd electrode formation process in the organic EL element 1 manufacturing process. It is the schematic diagram of the 2nd electrode formation process which showed a mode that the 2nd electrode was formed using the electrode film 31.
  • FIG. 3 is a longitudinal sectional view of a central portion of the organic EL element 1, and is a sectional view taken along line AA ′ of FIG. It is a top view of the organic EL element 1 which removed the upper sealing film 21.
  • FIG. It is a longitudinal cross-sectional view of the electrode film 31 required during manufacture of the organic EL
  • FIG. 1 is a longitudinal sectional view of the A-A ′ portion shown in FIG. In FIG. 2, the upper sealing film 21 is removed.
  • the organic EL element 1 includes a film substrate 11, a first electrode 12 formed on the film substrate 11, a light emitting layer 13 formed on the upper surface of the first electrode 12, and a light emitting layer. 13, the second electrode 14 having a large number of holes 18, the first auxiliary electrode 15 for inputting a potential from the outside of the organic EL element 1 to the first electrode 12, the second electrode The electrode 14 includes a second auxiliary electrode 16 for inputting a potential from the outside of the organic EL element 1 to the electrode 14, and a moisture absorption layer 17 formed on the surface of the second electrode 14 opposite to the light emitting layer 13.
  • the sealing portion 20 configured by the upper sealing film 21, the lower sealing film 22, and the sealing adhesive layer 25 that seal the element portion 10 from the upper, lower, left, and right sides.
  • the sealing part 20 is an example of the exterior body of the present invention.
  • the moisture absorption layer 17 absorbs moisture in the light emitting layer 13 through the holes 18. Further, the moisture contained in the space in the sealing portion 20 is also absorbed by the moisture absorption layer 17. Further, since the upper sealing film 21 is in close contact with the moisture absorbing layer 17 and the lower sealing film 22 is in close contact with the film substrate 11 and is sealed on all sides by the sealing adhesive layer 25, new moisture is not generated in the element portion 10. Does not invade.
  • first auxiliary electrode 15 and the second auxiliary electrode 16 extend to the outside of the sealing adhesive layer 25 and are used to input driving power.
  • the upper side of the drawing in FIG. 1 is described as the upper side, and the lower side of the drawing is described as the lower side.
  • the upper side of the drawing will be described as the upper side and the lower side of the drawing will be described as the lower side.
  • the film substrate 11 may be a film-like substance having transparency. Examples thereof include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polystyrene (PS), polyethersulfone (PES), polyimide (PI), and polyester.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PS polystyrene
  • PS polyethersulfone
  • PI polyimide
  • a first electrode 12 is provided on the upper surface of the film substrate 11.
  • a light-transmitting conductive oxide such as indium tin oxide (ITO) can be applied.
  • the light emitting layer 13 is provided on the surface opposite to the side on which the film substrate 11 is provided with respect to the first electrode 12.
  • polymer light emitting materials such as polyparaphenylene vinylene derivatives, polyfluorene derivatives and polythiophene derivatives, TPB (tetraphenylbutadiene), perylene, coumarin, rubrene, Nile red, DCM (4- Dicyanomethylene-2-methyl-6-dimethylaminostyryl-4-pyran), DCJTB (4-dicyanomethylene-6-cypressuridinostyryl-2-tert-butyl-4H-pyran), squarylium, aluminum complexes (eg A low molecular weight light emitting material such as AlQ3) can be used.
  • the thickness of the light emitting layer is preferably 20 to 100 nm.
  • the first auxiliary electrode 15 is connected to the outside of the organic EL element 1 continuously from the first electrode 12 to the film substrate 11 on which the first electrode 12 is not formed. Is formed.
  • Examples of the material of the first auxiliary electrode 15 include Al and Cr.
  • the second electrode 14 is provided on the surface of the light emitting layer 13 opposite to the side on which the first electrode 12 is provided.
  • a number of holes 18 are opened in the second electrode 14.
  • the material of the second electrode 14 include aluminum, lithium fluoride (LiF), MgAg alloy, Al / LiF laminate, Al / Ca laminate, Al / Ba laminate, and Al / MgAg laminate.
  • the shape of the hole 18 is shown as a circle in FIG. 2, but is not limited to this, and may be an arbitrary shape such as a rectangle or an ellipse. Further, the number and area of the holes 18 are not particularly limited, and may be any number and area that can obtain necessary luminance.
  • a moisture absorption layer 17 is provided on the surface opposite to the side on which the light emitting layer 13 is provided with respect to the second electrode 14.
  • the material of the moisture absorption layer 17 may be a paste made of an alkali metal oxide such as Ca or Ba, or a mixture of a moisture-adjusting organic substance (such as an Al metal complex).
  • the second electrode 14 is continuously connected to the film substrate 11 on which the second electrode 14 is not formed so as to be electrically connected to the outside of the organic EL element 1.
  • the second auxiliary electrode 16 is provided so as not to contact the first electrode 12.
  • the material of the second auxiliary electrode 16 is the same as that of the first auxiliary electrode 15.
  • the upper sealing film 21 and the lower sealing film 22 are provided so as to sandwich the element portion 10.
  • the upper sealing film 21 and the lower sealing film 22 need to have gas barrier properties.
  • a material for example, a film made of PET, PEN, PS, PES, PI or the like and a plurality of layers of an inorganic thin film such as SiO2, Al2O3, SiNx and a flexible acrylic resin thin film laminated in layers. Can be mentioned.
  • the upper sealing film 21 and the lower sealing film 22 are bonded and sealed with a sealing adhesive layer 25.
  • a sealing adhesive layer 25 As the adhesive that forms the sealing adhesive layer 25, a two-component epoxy adhesive, a one-component photocurable epoxy adhesive, or the like is used.
  • the first auxiliary electrode 15 and the second auxiliary electrode The electrode 16 and a part of the film substrate 11 on which these are formed are performed so as to extend outside the sealing adhesive layer 25.
  • the moisture absorption layer 17 also absorbs moisture that appears to be generated from the adhesive used in this step.
  • the first electrode 12 functions as an anode. Further, the second electrode 14 functions as a cathode.
  • the electrode film 31 is formed by laminating a perforated film substrate 32 formed with holes, an Al layer 34 formed on the perforated film substrate 32, and a LiF layer 33 formed on the Al layer 34. It is comprised by the Al / LiF layer 35 comprised by this.
  • the manufacturing process of the organic EL element 1 includes a first electrode forming step (S1) for forming the first electrode 12 on the film substrate 11, and a first electrode 12 in contact with the first electrode 12.
  • the element part forming process configured by the moisture absorption layer forming process (S6) for forming the layer 17 and the element part 10 formed by the element part forming process are divided into the upper sealing film 21, the lower sealing film 22, and the sealing.
  • the first electrode forming step of S1 is performed.
  • the first electrode 12 is formed on the upper surface of the film substrate 11.
  • ITO is vacuum-deposited with a thickness of 150 nm on the film substrate 11 (PEN film).
  • a positive resist for exposure is applied on the deposited ITO by spin coating. This resist was subjected to mask exposure using a mask on which a predetermined pattern was formed. Thereafter, etching was performed using aqua regia, which is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid, to form a first electrode 12 on which a desired electrode pattern was formed.
  • aqua regia which is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid
  • the first auxiliary electrode forming step of S2 is performed.
  • the first auxiliary electrode 15 that contacts the end portion of the first electrode 12 and is electrically connected to the outside of the element portion 10 is formed.
  • Al is formed by mask vapor deposition, and an Al electrode to be the first auxiliary electrode 15 is formed.
  • the second auxiliary electrode forming step of S3 is performed.
  • the second auxiliary electrode 16 is formed so as to contact the end portion of the second electrode 14 and to conduct to the outside of the element portion 10.
  • the specific method is the same as in the first auxiliary electrode forming step (S2).
  • the first auxiliary electrode forming step (S2) and the second auxiliary electrode forming step (S3) can be performed simultaneously.
  • the light emitting layer forming step of S4 is performed.
  • This step includes an electrode surface cleaning step and a light emitting layer forming operation step for actually forming the light emitting layer.
  • the electrode surface cleaning step the surface of the first electrode 12 is sequentially cleaned by neutral detergent cleaning, acetone cleaning, isopropyl alcohol (IPA) cleaning, and UV ozone cleaning.
  • the light emitting layer forming operation step the light emitting layer 13 was formed on the upper surface of the first electrode 12 after the cleaning by a spin coating method.
  • the ink used was a cyclohexylbenzene solution in which 2 wt% of a polyfluorene derivative that is an organic light emitting material was dissolved.
  • the second electrode forming step of S5 is performed. This step is divided into an electrode film forming step (S51) and an electrode sticking step (S52) as shown in FIG.
  • the electrode film forming step of S51 is a step for preparing the electrode film 31 used for forming the second electrode by the laminating method. First, an Al layer 34 is deposited on the perforated film substrate 32 by vacuum deposition. Next, the LiF layer 33 is deposited. As a result, the electrode film 31 on which the Al / LiF layer 35 that forms the base of the second electrode 14 with holes is formed. At this time, the thicknesses of the Al layer and the LiF layer were 1000 mm and 10 mm, respectively.
  • the electrode film 31 prepared in the electrode film forming step (S51) is rolled on the light emitting layer 13 and the second auxiliary electrode 16 with a roller. It is a step of applying and forming the second electrode 14. Specifically, the electrode film 31 in which the Al / LiF laminated structure is formed is pasted on the light emitting layer 13 and the second auxiliary electrode 16 by a laminating method in which the electrode film 31 is heated to 130 ° C. and pressed with 105 Pascals. . In this way, the second electrode 14 was formed on the light emitting layer 13 and the second auxiliary electrode 16.
  • a moisture absorption layer forming step of S6 is performed.
  • the hygroscopic layer 17 was formed by pasting a film-like humidity adjusting agent obtained by pasting Ca on the second electrode 14.
  • the element part sealing process of S7 is performed.
  • the element portion 10 formed in the steps up to S5 is sandwiched between two PEN films and vacuum laminated with a two-component epoxy adhesive (Araldite: manufactured by Ciba Specialty Chemicals). Sealing films 21 and 22 were formed.
  • Comparative Example 1 which is an organic EL element different from the example of the present invention in that an electrode having no hole 18 is used for the second electrode 14.
  • Table 1 shows the results of the performance evaluation.
  • the initial luminance is set to 300 cd / m2
  • the luminance half-time which is the time until the luminance of the light emitting layer 13 deteriorates and the luminance is reduced to half when the current is continuously supplied and continuously driven, is measured. went. The longer the brightness half-life, the longer the lifetime is evaluated. This evaluation was performed under a normal temperature and normal pressure environment.
  • the organic EL device of Comparative Example 1 had half the luminance half time compared to the organic EL device of the example. That is, it is possible to double the lifetime of the organic EL element that is thinned by directly attaching the moisture absorbing layer 17 to the second electrode 14. By opening the hole 18 in the second electrode 14, the moisture absorption layer 17 comes close to the light emitting layer 13 through the hole 18, so that moisture and oxygen mixed in the light emitting layer 13 can be effectively absorbed. As a result, the lifetime of the organic EL element can be extended.

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Abstract

Provided is an organic EL element designed to be even thinner and longer lasting, and a manufacturing method therefor. The organic EL element (1) is configured from an element component (10) comprising a film base (11), a first electrode (12) formed upon the film base (11), a light-emitting layer (13) formed upon the top surface of the first electrode (12), a second electrode (14) with open pores (18) formed upon the light-emitting layer (13), a first auxiliary electrode (15) for inputting electric potential from the outside of the organic EL element (1) to the first electrode (12), a second auxiliary electrode (16) for inputting electric potential from the outside of the organic EL element (1) to the second electrode (14), and a moisture absorbent layer (17) formed upon the reverse surface of the second electrode (14) from the light-emitting layer (13); and a sealing component (20) which seals the element component (10) from all sides and which comprises a top sealing film (21), a bottom sealing film (22), and an adhesive sealant layer (25).

Description

有機ＥＬ素子及び有機ＥＬ素子の製造方法ORGANIC EL ELEMENT AND METHOD FOR PRODUCING ORGANIC EL ELEMENT
　本発明は、薄型の有機ＥＬ素子及び有機ＥＬ素子の製造方法に関する。 The present invention relates to a thin organic EL element and a method for manufacturing the organic EL element.
　有機ＥＬ素子を利用した平面ディスプレイは、次世代のディスプレイとして大きな注目を浴びており、これについての研究開発が盛んに行われている。特に、有機ＥＬ素子を利用すれば、直流低電圧駆動、高視野角、自発光などの特徴を有する高解像度ディスプレイが実現可能であり、その利用価値は非常に高いと考えられている。 The flat display using the organic EL element has attracted a great deal of attention as the next generation display, and research and development on this has been actively conducted. In particular, if an organic EL element is used, a high-resolution display having characteristics such as direct current low voltage driving, high viewing angle, and self-luminous emission can be realized, and its utility value is considered to be very high.
　この有機ＥＬ素子は、例えばガラス基板上に、透明電極（陽極）／発光層／金属電極（陰極）を積層形成した構成を有している。また、陽極には仕事関数の大きな物質が用いられ、陰極には仕事関数の小さな物質が用いられる。そして、発光層に有機材料が用いられ、両電極から注入される正孔と電子が発光層において、再結合することによって発光する。 This organic EL element has a configuration in which, for example, a transparent electrode (anode) / a light emitting layer / a metal electrode (cathode) are laminated on a glass substrate. A material having a high work function is used for the anode, and a material having a low work function is used for the cathode. An organic material is used for the light emitting layer, and holes and electrons injected from both electrodes recombine in the light emitting layer to emit light.
　ここで、発光層に利用する固体有機材料は、水分などに侵されやすく、大気中で有機ＥＬ素子を駆動するとその発光特性が急激に劣化する。そこで、ガラス基板上に形成された透明電極と、これに対向する対向電極の間に有機材料からなる発光層を狭持し、両電極からキャリアを発光層に注入することによって発光層を発光させる有機ＥＬ素子において、上記少なくとも発光層及び対向電極を囲う封止ガラス板により密封室を形成し、この密封室内に不活性ガスを封入すると共に、封止ガラス板と対向電極との間に吸湿性多孔質層を設けることにより、素子中の水分を吸収させ、有機ＥＬ素子の発光特性の劣化を防止し、素子の長寿命化をはかる提案が特許文献１に示されている。 Here, the solid organic material used for the light-emitting layer is easily affected by moisture and the like, and when the organic EL element is driven in the air, the light-emitting characteristics are rapidly deteriorated. Therefore, a light emitting layer made of an organic material is sandwiched between a transparent electrode formed on a glass substrate and a counter electrode facing the transparent electrode, and carriers are injected into the light emitting layer from both electrodes to cause the light emitting layer to emit light. In the organic EL element, a sealing chamber is formed by a sealing glass plate surrounding at least the light emitting layer and the counter electrode, and an inert gas is sealed in the sealing chamber, and a hygroscopic property is provided between the sealing glass plate and the counter electrode. Patent Document 1 discloses a proposal for providing a porous layer to absorb moisture in the element, preventing deterioration of light emission characteristics of the organic EL element, and extending the life of the element.
特開平１０－２７５６７９号公報Japanese Patent Laid-Open No. 10-275679
　しかしながら、特許文献１に示される構造では、封止ガラス板の内面に吸湿性多孔質層を設けているため、吸湿性多孔質層と対向電極との間には、吸湿性多孔質層が吸湿を行えるように、ある程度の内部空間を設ける必要があり、このことが有機ＥＬ素子の薄型化を図る際の制約となってしまった。 However, in the structure shown in Patent Document 1, since the hygroscopic porous layer is provided on the inner surface of the sealing glass plate, the hygroscopic porous layer is hygroscopic between the hygroscopic porous layer and the counter electrode. It is necessary to provide a certain amount of internal space so that the thickness of the organic EL element can be reduced.
　また、もっとも水分に侵されたくない部位である発光層は、ほとんど内部空間に露出していないため、製造工程にて発光層に混入してしまった水分や、電極間の発光層の露出面から発光層に侵入する湿気に対し、有効な吸湿ができるとは必ずしも言えないものであった。 In addition, since the light emitting layer, which is the most unaffected by moisture, is hardly exposed in the internal space, moisture that has been mixed in the light emitting layer during the manufacturing process, or from the exposed surface of the light emitting layer between the electrodes. It cannot always be said that effective moisture absorption can be performed with respect to moisture entering the light emitting layer.
　本発明は、これらの問題点を解決し、より一層の薄型化を図りつつ、発光層の水分をより効果的に吸収させることで有機ＥＬ素子の劣化を防止し、長寿命化をはかった有機ＥＬ素子及びその製造方法を提供することを目的とする。 The present invention solves these problems, further reduces the thickness, and more effectively absorbs moisture in the light emitting layer, thereby preventing deterioration of the organic EL element and extending the life. An object of the present invention is to provide an EL element and a manufacturing method thereof.
　上記目的を達成するために、本発明の請求項１に係る発明の有機ＥＬ素子は、有機発光材料により構成される平面形状の発光層と、前記発光層の一方の面に形成される第１の電極と、前記発光層の他方の面に形成される第２の電極と、吸湿物質により構成される吸湿層と、により構成される素子部と、前記素子部を被覆して封止する外装体とにより構成される有機ＥＬ素子であって、前記第２の電極には孔が空いており、前記吸湿層が、前記第２の電極に対して、前記発光層が設けられている側とは反対側の面に形成されることを特徴とする。 In order to achieve the above object, an organic EL device according to a first aspect of the present invention includes a planar light emitting layer made of an organic light emitting material, and a first formed on one surface of the light emitting layer. An element part composed of a first electrode, a second electrode formed on the other surface of the light emitting layer, and a hygroscopic layer composed of a hygroscopic substance, and an exterior covering and sealing the element part An organic EL element composed of a body, wherein the second electrode has a hole, and the moisture absorption layer is provided on the side where the light emitting layer is provided with respect to the second electrode; Is formed on the opposite surface.
　また、本発明の請求項２に係る発明の有機ＥＬ素子は、請求項１に記載の発明の構成に加え、前記第１の電極は前記発光層に正孔を注入する陽極であり、前記第２の電極は前記発光層に電子を注入する陰極であることを特徴とする。 An organic EL device according to a second aspect of the present invention is the organic EL element according to the first aspect, wherein the first electrode is an anode that injects holes into the light emitting layer, and the first The second electrode is a cathode for injecting electrons into the light emitting layer.
　また、本発明の請求項３に係る発明の有機ＥＬ素子製造方法は、有機発光材料により構成される発光層と、前記発光層の一方の面に形成される第１の電極と、前記発光層の他方の面に形成される、孔が空いている第２の電極と、前記第２の電極に対して、前記発光層が設けられている側とは反対側の面に形成される、吸湿物質により構成される吸湿層と、により構成される素子部と、前記素子部を被覆して封止する外装体とにより構成される有機ＥＬ素子を製造する有機ＥＬ素子製造方法であって、前記第２の電極は、前記発光層に対し、孔の空いている電極フィルムを、ラミネート法にて貼り付けることにより形成されることを特徴とする。 According to a third aspect of the present invention, there is provided a method for manufacturing an organic EL element, comprising: a light emitting layer made of an organic light emitting material; a first electrode formed on one surface of the light emitting layer; and the light emitting layer. A second electrode having a hole formed on the other surface of the first electrode, and a moisture absorption formed on a surface opposite to the side on which the light emitting layer is provided with respect to the second electrode. An organic EL element manufacturing method for manufacturing an organic EL element configured by a moisture absorbing layer configured by a substance, an element unit configured by the material, and an exterior body that covers and seals the element unit, The second electrode is formed by attaching an electrode film having a hole to the light emitting layer by a laminating method.
　請求項１に係る発明の有機ＥＬ素子は、孔の空いている第２の電極の一方の面に発光層が形成され、他方の面に吸湿層が形成されることにより、吸湿層が第２の電極に空いている孔を通じて発光層と近接するため、発光層に混入した水分を吸湿層によって効果的に吸収することができ、かつ吸湿層が吸湿を行うために内部空間を設ける必要がなくなる。このことにより、劣化が少なく長寿命で、かつ薄型の有機ＥＬ素子を得ることができる。 In the organic EL element of the invention according to claim 1, the light-absorbing layer is formed by forming the light-emitting layer on one surface of the second electrode having a hole and forming the moisture-absorbing layer on the other surface. Since it is close to the light-emitting layer through a hole in the electrode, moisture mixed in the light-emitting layer can be effectively absorbed by the moisture-absorbing layer, and there is no need to provide an internal space for the moisture-absorbing layer to absorb moisture. . As a result, a thin organic EL element with little deterioration and long life can be obtained.
　請求項２に係る発明の有機ＥＬ素子は、請求項１に記載の発明の効果に加え、孔の空いていない第１の電極を陽極とすることで、有機ＥＬ素子をより効率的に発光させることが可能となる。陽極には、陰極よりも仕事関数の高い物質を用いた方が有機ＥＬ素子を効率的に駆動できることが知られているが、たとえば、金属電極よりも仕事関数が高い物質を陽極に用いる場合には、陽極を仕事関数が高い透明電極とすることができる。 In addition to the effect of the invention according to claim 1, the organic EL element according to claim 2 causes the organic EL element to emit light more efficiently by using the first electrode without a hole as an anode. It becomes possible. For the anode, it is known that a material having a higher work function than the cathode can drive the organic EL element more efficiently. For example, when a material having a higher work function than the metal electrode is used for the anode, Can make the anode a transparent electrode with a high work function.
　請求項３に係る発明の有機ＥＬ素子の製造方法は、第２の電極がラミネート法により形成されることにより、孔の空いた第２の電極を、より簡便かつ安価に形成することができる。 In the method for producing an organic EL element of the invention according to claim 3, the second electrode having a hole can be formed more easily and inexpensively by forming the second electrode by a laminating method.
有機ＥＬ素子１の中央部の縦断面図であり、図２のＡ－Ａ‘線断面図である。FIG. 3 is a longitudinal sectional view of a central portion of the organic EL element 1, and is a sectional view taken along line AA ′ of FIG. 上部封止フィルム２１を取り除いた有機ＥＬ素子１の平面図である。It is a top view of the organic EL element 1 which removed the upper sealing film 21. FIG. 有機ＥＬ素子１製造中に必要な電極フィルム３１の縦断面図である。It is a longitudinal cross-sectional view of the electrode film 31 required during manufacture of the organic EL element 1. FIG. 有機ＥＬ素子１の製造工程を示すフローチャートである。3 is a flowchart showing manufacturing steps of the organic EL element 1. 有機ＥＬ素子１製造工程中の第２の電極形成工程を示すフローチャートである。It is a flowchart which shows the 2nd electrode formation process in the organic EL element 1 manufacturing process. 電極フィルム３１を使用して第２の電極を形成する様子を示した、第２の電極形成工程の模式図である。It is the schematic diagram of the 2nd electrode formation process which showed a mode that the 2nd electrode was formed using the electrode film 31. FIG.
　以下、本発明の有機ＥＬ素子について、図面を参照して説明する。なお、図１の縦断面図は、図２で示すＡ－Ａ’部の縦断面図である。また、図２においては、上部封止フィルム２１は取り除いた図面とした。 Hereinafter, the organic EL element of the present invention will be described with reference to the drawings. The longitudinal sectional view of FIG. 1 is a longitudinal sectional view of the A-A ′ portion shown in FIG. In FIG. 2, the upper sealing film 21 is removed.
　有機ＥＬ素子１は、図１及び図２に示す通り、フィルム基板１１、フィルム基板１１上に形成された第１の電極１２、第１の電極１２の上面に形成された発光層１３、発光層１３上に形成された、多数の孔１８が空いている第２の電極１４、第１の電極１２へ有機ＥＬ素子１の外部から電位を入力するための第１の補助電極１５、第２の電極１４へ有機ＥＬ素子１の外部から電位を入力するための第２の補助電極１６、及び第２の電極１４の発光層１３とは反対側の面に形成されている吸湿層１７により構成される素子部１０と、素子部１０を上下左右から封止する、上部封止フィルム２１、下部封止フィルム２２、及び封止接着剤層２５により構成される封止部２０とによって構成される。封止部２０は、本発明の外装体の一例である。吸湿層１７は、孔１８を通じて発光層１３中の水分を吸湿する。また、吸湿層１７によって封止部２０中の空間に含まれる湿気も吸湿する。また、上部封止フィルム２１は吸湿層１７と、下部封止フィルム２２はフィルム基板１１と密着し、かつ封止接着剤層２５により四方を封止するため、素子部１０には新たな湿気は侵入しない。また、第１の補助電極１５、第２の補助電極１６は、封止接着剤層２５の外部へ延出しており、駆動電力の投入に使用される。以下の説明では、図１において図面上側を上側、図面下側を下側として説明する。なお、以降の図面においても、同様にして図面上側を上側、図面下側を下側として説明する。 As shown in FIGS. 1 and 2, the organic EL element 1 includes a film substrate 11, a first electrode 12 formed on the film substrate 11, a light emitting layer 13 formed on the upper surface of the first electrode 12, and a light emitting layer. 13, the second electrode 14 having a large number of holes 18, the first auxiliary electrode 15 for inputting a potential from the outside of the organic EL element 1 to the first electrode 12, the second electrode The electrode 14 includes a second auxiliary electrode 16 for inputting a potential from the outside of the organic EL element 1 to the electrode 14, and a moisture absorption layer 17 formed on the surface of the second electrode 14 opposite to the light emitting layer 13. And the sealing portion 20 configured by the upper sealing film 21, the lower sealing film 22, and the sealing adhesive layer 25 that seal the element portion 10 from the upper, lower, left, and right sides. The sealing part 20 is an example of the exterior body of the present invention. The moisture absorption layer 17 absorbs moisture in the light emitting layer 13 through the holes 18. Further, the moisture contained in the space in the sealing portion 20 is also absorbed by the moisture absorption layer 17. Further, since the upper sealing film 21 is in close contact with the moisture absorbing layer 17 and the lower sealing film 22 is in close contact with the film substrate 11 and is sealed on all sides by the sealing adhesive layer 25, new moisture is not generated in the element portion 10. Does not invade. Further, the first auxiliary electrode 15 and the second auxiliary electrode 16 extend to the outside of the sealing adhesive layer 25 and are used to input driving power. In the following description, the upper side of the drawing in FIG. 1 is described as the upper side, and the lower side of the drawing is described as the lower side. In the following drawings, similarly, the upper side of the drawing will be described as the upper side and the lower side of the drawing will be described as the lower side.
　フィルム基板１１は、透明性を持つフィルム状の物質であればよい。例えば、ポリエチレンテレフタレート（ＰＥＴ）、ポリエチレンナフタレート（ＰＥＮ）、ポリスチレン（ＰＳ）、ポリエーテルスルホン（ＰＥＳ）、ポリイミド（ＰＩ）、ポリエステルが挙げられる。 The film substrate 11 may be a film-like substance having transparency. Examples thereof include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polystyrene (PS), polyethersulfone (PES), polyimide (PI), and polyester.
　フィルム基板１１上面には第１の電極１２が設けられている。この第１の電極１２の材質としては、酸化インジウムスズ（ＩＴＯ）などの透光性のある導電性酸化物などが適用可能である。 A first electrode 12 is provided on the upper surface of the film substrate 11. As a material of the first electrode 12, a light-transmitting conductive oxide such as indium tin oxide (ITO) can be applied.
　発光層１３は、第１の電極１２に対して、フィルム基板１１が設けられた側とは反対側の面に設けられている。発光層１３の材質としては、ポリパラフェニレンビニレン誘導体、ポリフルオレン誘導体、ポリチオフェン誘導体等の高分子系発光材料、及び、ＴＰＢ（テトラフェニルブタジエン）、ペリレン、クマリン、ルブレン、ナイルレッド、ＤＣＭ（４－ジシアノメチレン－２－メチル－６－ジメチルアミノスチリル－４－ピラン）、ＤＣＪＴＢ（４－ジシアノメチレン－６－シーピージュロリジノスチリル－２－ターシャルブチル－４Ｈ－ピラン）、スクアリリウム、アルミニウム錯体（例えばＡｌＱ３）等の低分子系発光材料が利用可能である。発光層の厚みは２０～１００ｎｍであることが好ましい。 The light emitting layer 13 is provided on the surface opposite to the side on which the film substrate 11 is provided with respect to the first electrode 12. As the material of the light emitting layer 13, polymer light emitting materials such as polyparaphenylene vinylene derivatives, polyfluorene derivatives and polythiophene derivatives, TPB (tetraphenylbutadiene), perylene, coumarin, rubrene, Nile red, DCM (4- Dicyanomethylene-2-methyl-6-dimethylaminostyryl-4-pyran), DCJTB (4-dicyanomethylene-6-cypressuridinostyryl-2-tert-butyl-4H-pyran), squarylium, aluminum complexes (eg A low molecular weight light emitting material such as AlQ3) can be used. The thickness of the light emitting layer is preferably 20 to 100 nm.
　図２に示す通り、第１の電極１２から、第１の電極１２の形成されていないフィルム基板１１へ連続して、有機ＥＬ素子１の外部に導通するように、第１の補助電極１５が形成されている。第１の補助電極１５の材質としては、Ａｌ、Ｃｒなどが挙げられる。 As shown in FIG. 2, the first auxiliary electrode 15 is connected to the outside of the organic EL element 1 continuously from the first electrode 12 to the film substrate 11 on which the first electrode 12 is not formed. Is formed. Examples of the material of the first auxiliary electrode 15 include Al and Cr.
　発光層１３に対して、第１の電極１２が設けられた側とは反対側の面には、第２の電極１４が設けられている。第２の電極１４には、多数の孔１８が空けられている。第２の電極１４の材質としては、アルミニウム、フッ化リチウム（ＬｉＦ）、ＭｇＡｇ合金、Ａｌ／ＬｉＦ積層物、Ａｌ／Ｃａ積層物、Ａｌ／Ｂａ積層物、及びＡｌ／ＭｇＡｇ積層物などが挙げられる。孔１８の形状は、図２では円形で示したがこれには限定されず、四角形、楕円形など任意の形状をとることができる。また、孔１８の数、面積についても特に限定されず、必要な輝度を得ることのできる数、面積であればよい。 The second electrode 14 is provided on the surface of the light emitting layer 13 opposite to the side on which the first electrode 12 is provided. A number of holes 18 are opened in the second electrode 14. Examples of the material of the second electrode 14 include aluminum, lithium fluoride (LiF), MgAg alloy, Al / LiF laminate, Al / Ca laminate, Al / Ba laminate, and Al / MgAg laminate. . The shape of the hole 18 is shown as a circle in FIG. 2, but is not limited to this, and may be an arbitrary shape such as a rectangle or an ellipse. Further, the number and area of the holes 18 are not particularly limited, and may be any number and area that can obtain necessary luminance.
　第２の電極１４に対して、発光層１３が設けられた側とは反対側の面には、吸湿層１７が設けられている。吸湿層１７の材質としては、Ｃａ、Ｂａ等のアルカリ金属酸化物をペースト化したもの、またはそれに調湿性の有機物（Ａｌ金属錯体等）を混合したものでもよい。 A moisture absorption layer 17 is provided on the surface opposite to the side on which the light emitting layer 13 is provided with respect to the second electrode 14. The material of the moisture absorption layer 17 may be a paste made of an alkali metal oxide such as Ca or Ba, or a mixture of a moisture-adjusting organic substance (such as an Al metal complex).
　また、フィルム基板１１上には、図２に示す通り、第２の電極１４から、第２の電極１４の形成されていないフィルム基板１１へ連続して、有機ＥＬ素子１の外部に導通するように、第２の補助電極１６が、第１の電極１２と接触しないように設けられている。第２の補助電極１６の材質は、第１の補助電極１５と同様である。 On the film substrate 11, as shown in FIG. 2, the second electrode 14 is continuously connected to the film substrate 11 on which the second electrode 14 is not formed so as to be electrically connected to the outside of the organic EL element 1. In addition, the second auxiliary electrode 16 is provided so as not to contact the first electrode 12. The material of the second auxiliary electrode 16 is the same as that of the first auxiliary electrode 15.
　上部封止フィルム２１、及び下部封止フィルム２２は、素子部１０を挟み込む形で設けられている。上部封止フィルム２１、及び下部封止フィルム２２は、ガスバリア性を具備している必要がある。そのような材質としては、例えば、ＰＥＴ、ＰＥＮ、ＰＳ、ＰＥＳ、ＰＩ等のフィルムにＳｉＯ２、Ａｌ２Ｏ３、ＳｉＮｘ等の無機薄膜と柔軟性のあるアクリル樹脂薄膜などを層状に複数層重ね合わせたものが挙げられる。 The upper sealing film 21 and the lower sealing film 22 are provided so as to sandwich the element portion 10. The upper sealing film 21 and the lower sealing film 22 need to have gas barrier properties. As such a material, for example, a film made of PET, PEN, PS, PES, PI or the like and a plurality of layers of an inorganic thin film such as SiO2, Al2O3, SiNx and a flexible acrylic resin thin film laminated in layers. Can be mentioned.
　上部封止フィルム２１、及び下部封止フィルム２２は、封止接着剤層２５により接着、封止されている。封止接着剤層２５を形成する接着剤としては、二液性のエポキシ接着剤または一液性光硬化型エポキシ接着剤等が使用される。なお、上部封止フィルム２１、下部封止フィルム２２、及び封止接着剤層２５により素子部１０を封止する際には、図２に示す通り、第１の補助電極１５、第２の補助電極１６、及びこれらが形成されているフィルム基板１１の一部が封止接着剤層２５の外側に延出するように行う。なお、この工程にて使用する接着剤から発生すると思われる水分についても、吸湿層１７にて吸湿する。 The upper sealing film 21 and the lower sealing film 22 are bonded and sealed with a sealing adhesive layer 25. As the adhesive that forms the sealing adhesive layer 25, a two-component epoxy adhesive, a one-component photocurable epoxy adhesive, or the like is used. When the element portion 10 is sealed with the upper sealing film 21, the lower sealing film 22, and the sealing adhesive layer 25, as shown in FIG. 2, the first auxiliary electrode 15 and the second auxiliary electrode The electrode 16 and a part of the film substrate 11 on which these are formed are performed so as to extend outside the sealing adhesive layer 25. Note that the moisture absorption layer 17 also absorbs moisture that appears to be generated from the adhesive used in this step.
　本発明の有機ＥＬ素子１において、第１の電極１２は陽極として作用する。また、第２の電極１４は陰極として作用する。 In the organic EL element 1 of the present invention, the first electrode 12 functions as an anode. Further, the second electrode 14 functions as a cathode.
　ついで、本発明の有機ＥＬ素子を製造する工程中にて使用する電極フィルムについて、図３を参照して説明する。電極フィルム３１は、孔が空いて形成されている孔空きフィルム基板３２と、孔空きフィルム基板３２上に形成されたＡｌ層３４とＡｌ層３４上に形成されたＬｉＦ層３３とが積層されることで構成されるＡｌ／ＬｉＦ層３５とにより構成される。 Next, an electrode film used in the process of manufacturing the organic EL element of the present invention will be described with reference to FIG. The electrode film 31 is formed by laminating a perforated film substrate 32 formed with holes, an Al layer 34 formed on the perforated film substrate 32, and a LiF layer 33 formed on the Al layer 34. It is comprised by the Al / LiF layer 35 comprised by this.
　次に、有機ＥＬ素子１の製造工程について説明する。有機ＥＬ素子１の製造工程は、図４に示すように、フィルム基板１１上に第１の電極１２を形成する第１の電極形成工程（Ｓ１）と、第１の電極１２に接触して第１の補助電極１５を形成する第１の補助電極形成工程（Ｓ２）と、フィルム基板１１上に第２の補助電極１６を形成する第２の補助電極形成工程（Ｓ３）と、第１の電極１２上に発光層１３を形成する発光層形成工程（Ｓ４）と、発光層１３上に第２の電極１４を形成する第２の電極形成工程（Ｓ５）と、第２の電極１４上に吸湿層１７を形成する吸湿層形成工程（Ｓ６）とにより構成される素子部形成工程と、素子部形成工程により形成された素子部１０を、上部封止フィルム２１、下部封止フィルム２２、及び封止接着剤層２５によって封止する素子部封止工程（Ｓ７）とからなる。 Next, the manufacturing process of the organic EL element 1 will be described. As shown in FIG. 4, the manufacturing process of the organic EL element 1 includes a first electrode forming step (S1) for forming the first electrode 12 on the film substrate 11, and a first electrode 12 in contact with the first electrode 12. A first auxiliary electrode forming step (S2) for forming one auxiliary electrode 15, a second auxiliary electrode forming step (S3) for forming a second auxiliary electrode 16 on the film substrate 11, and a first electrode A light emitting layer forming step (S4) for forming the light emitting layer 13 on the light emitting layer 13, a second electrode forming step (S5) for forming the second electrode 14 on the light emitting layer 13, and a moisture absorption on the second electrode 14; The element part forming process configured by the moisture absorption layer forming process (S6) for forming the layer 17 and the element part 10 formed by the element part forming process are divided into the upper sealing film 21, the lower sealing film 22, and the sealing. Element portion sealing step (S7) for sealing with the adhesive layer 25 It made.
　はじめに、Ｓ１の第１の電極形成工程が行われる。この工程では、フィルム基板１１の上面に第１の電極１２が形成される。本実施形態では、フィルム基板１１（ＰＥＮのフィルム）上に、ＩＴＯを１５０ｎｍの厚みで真空成膜する。次に成膜したＩＴＯ上に露光用のポジ型レジストをスピンコートにより塗布する。このレジストを、所定のパターンを形成してあるマスクを使用してマスク露光した。その後、濃硝酸と濃塩酸の混合液である王水を用いてエッチングを行い、所望の電極パターンが形成された第１の電極１２を成膜した。 First, the first electrode forming step of S1 is performed. In this step, the first electrode 12 is formed on the upper surface of the film substrate 11. In this embodiment, ITO is vacuum-deposited with a thickness of 150 nm on the film substrate 11 (PEN film). Next, a positive resist for exposure is applied on the deposited ITO by spin coating. This resist was subjected to mask exposure using a mask on which a predetermined pattern was formed. Thereafter, etching was performed using aqua regia, which is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid, to form a first electrode 12 on which a desired electrode pattern was formed.
　次に、Ｓ２の第１の補助電極形成工程が行われる。この工程では、第１の電極１２の端部に接触し、素子部１０の外部に導通するような第１の補助電極１５が形成される。具体的には、Ａｌをマスク蒸着にて形成し、第１の補助電極１５となるＡｌ電極を形成する。 Next, the first auxiliary electrode forming step of S2 is performed. In this step, the first auxiliary electrode 15 that contacts the end portion of the first electrode 12 and is electrically connected to the outside of the element portion 10 is formed. Specifically, Al is formed by mask vapor deposition, and an Al electrode to be the first auxiliary electrode 15 is formed.
　次に、Ｓ３の第２の補助電極形成工程が行われる。この工程では、第２の電極１４の端部に接触し、素子部１０の外部に導通するような第２の補助電極１６が形成される。具体的方法は第１の補助電極形成工程（Ｓ２）と同じである。第1の補助電極形成工程（Ｓ２）と第２の補助電極形成工程（Ｓ３）は同時に行うこともできる。 Next, the second auxiliary electrode forming step of S3 is performed. In this step, the second auxiliary electrode 16 is formed so as to contact the end portion of the second electrode 14 and to conduct to the outside of the element portion 10. The specific method is the same as in the first auxiliary electrode forming step (S2). The first auxiliary electrode forming step (S2) and the second auxiliary electrode forming step (S3) can be performed simultaneously.
　次に、Ｓ４の発光層形成工程が行われる。この工程は、電極表面洗浄工程と発光層を実際に形成する発光層形成作業工程とからなる。まず、電極表面洗浄工程では、第１の電極１２の表面を、中性洗剤洗浄、アセトン洗浄、イソプロピルアルコール（ＩＰＡ）洗浄、及びＵＶオゾン洗浄にて順次洗浄する。次いで、発光層形成作業工程において、洗浄の終わった第１の電極１２上面に、スピンコート法にて発光層１３を形成した。使用したインクは、有機発光材料であるポリフルオレン誘導体を２ｗｔ％溶解させた、シクロヘキシルベンゼン溶液であった。 Next, the light emitting layer forming step of S4 is performed. This step includes an electrode surface cleaning step and a light emitting layer forming operation step for actually forming the light emitting layer. First, in the electrode surface cleaning step, the surface of the first electrode 12 is sequentially cleaned by neutral detergent cleaning, acetone cleaning, isopropyl alcohol (IPA) cleaning, and UV ozone cleaning. Next, in the light emitting layer forming operation step, the light emitting layer 13 was formed on the upper surface of the first electrode 12 after the cleaning by a spin coating method. The ink used was a cyclohexylbenzene solution in which 2 wt% of a polyfluorene derivative that is an organic light emitting material was dissolved.
　次に、Ｓ５の第２の電極形成工程が行われる。この工程は、図５にて示す通り、電極フィルム形成工程（Ｓ５１）と、電極貼付工程（Ｓ５２）とにわかれる。 Next, the second electrode forming step of S5 is performed. This step is divided into an electrode film forming step (S51) and an electrode sticking step (S52) as shown in FIG.
　Ｓ５１の電極フィルム形成工程は、ラミネート法による第２の電極形成に用いる電極フィルム３１を用意するための工程である。孔空きフィルム基板３２上に真空蒸着にて、まずＡｌ層３４を蒸着する。次に、ＬｉＦ層３３を蒸着する。このことにより、孔の空いた第２の電極１４の基となるＡｌ／ＬｉＦ層３５が形成された電極フィルム３１が形成される。この際、Ａｌ層とＬｉＦ層の厚みはそれぞれ１０００Å、１０Åとなるように形成した。 The electrode film forming step of S51 is a step for preparing the electrode film 31 used for forming the second electrode by the laminating method. First, an Al layer 34 is deposited on the perforated film substrate 32 by vacuum deposition. Next, the LiF layer 33 is deposited. As a result, the electrode film 31 on which the Al / LiF layer 35 that forms the base of the second electrode 14 with holes is formed. At this time, the thicknesses of the Al layer and the LiF layer were 1000 mm and 10 mm, respectively.
　Ｓ５２の電極貼付工程は、図６に示す通り、電極フィルム形成工程（Ｓ５１）にて用意された電極フィルム３１を、発光層１３及び第２の補助電極１６上にローラにて転圧をかけながら貼付し、第２の電極１４を形成する工程である。具体的には、Ａｌ／ＬｉＦ積層構造を形成しておいた電極フィルム３１を、１３０℃に加熱、１０５パスカルにて押圧したラミネート法にて発光層１３及び第２の補助電極１６上に貼付する。このようにして発光層１３及び第２の補助電極１６上に第２の電極１４を形成した。 In the electrode pasting step of S52, as shown in FIG. 6, the electrode film 31 prepared in the electrode film forming step (S51) is rolled on the light emitting layer 13 and the second auxiliary electrode 16 with a roller. It is a step of applying and forming the second electrode 14. Specifically, the electrode film 31 in which the Al / LiF laminated structure is formed is pasted on the light emitting layer 13 and the second auxiliary electrode 16 by a laminating method in which the electrode film 31 is heated to 130 ° C. and pressed with 105 Pascals. . In this way, the second electrode 14 was formed on the light emitting layer 13 and the second auxiliary electrode 16.
　次に、Ｓ６の吸湿層形成工程が行われる。この工程では、第２の電極１４上にＣａをペースト化したフィルム状の調湿剤を貼り付けることで吸湿層１７を形成した。 Next, a moisture absorption layer forming step of S6 is performed. In this step, the hygroscopic layer 17 was formed by pasting a film-like humidity adjusting agent obtained by pasting Ca on the second electrode 14.
　次に、Ｓ７の素子部封止工程が行われる。この工程では、Ｓ５までの工程にて形成された素子部１０を、２枚のＰＥＮフィルムにて挟み込み、二液性のエポキシ接着剤（アラルダイト：チバスペシャリティケミカルズ製）にて真空ラミネートすることで各封止フィルム２１、２２を形成した。 Next, the element part sealing process of S7 is performed. In this step, the element portion 10 formed in the steps up to S5 is sandwiched between two PEN films and vacuum laminated with a two-component epoxy adhesive (Araldite: manufactured by Ciba Specialty Chemicals). Sealing films 21 and 22 were formed.
　次に、上述の製造方法によって形成された有機ＥＬ素子１の効果を確認するため、有機ＥＬ素子１の性能評価を行った。この性能評価では、比較例として、第２の電極１４に孔１８の空いていない電極を用いるという点で本発明の実施例と異なる有機ＥＬ素子である比較例１について比較性能評価を行った。性能評価を行った結果を表１に示す。なお、性能評価は、初期輝度は３００ｃｄ／ｍ２とし、そのまま電流を流し続けて連続駆動した場合に発光層１３が劣化して輝度が半分になるまでの時間である輝度半減時間を測定することで行った。輝度半減時間が長ければ長い程、寿命が長いものと評価される。なお、この評価は、常温、常圧環境下にて行った。 Next, in order to confirm the effect of the organic EL element 1 formed by the above manufacturing method, the performance of the organic EL element 1 was evaluated. In this performance evaluation, as a comparative example, comparative performance evaluation was performed on Comparative Example 1 which is an organic EL element different from the example of the present invention in that an electrode having no hole 18 is used for the second electrode 14. Table 1 shows the results of the performance evaluation. In the performance evaluation, the initial luminance is set to 300 cd / m2, and the luminance half-time, which is the time until the luminance of the light emitting layer 13 deteriorates and the luminance is reduced to half when the current is continuously supplied and continuously driven, is measured. went. The longer the brightness half-life, the longer the lifetime is evaluated. This evaluation was performed under a normal temperature and normal pressure environment.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示した通り、実施例の有機ＥＬ素子に対し、比較例１の有機ＥＬ素子では、輝度半減時間が半分であった。つまり、吸湿層１７を第２の電極１４に直接貼付することで薄型化した有機ＥＬ素子の寿命を、倍とすることが可能となった。第２の電極１４に孔１８を空けることで、吸湿層１７が孔１８を通じて発光層１３と近接するため、発光層１３に混入した水分や酸素を効果的に吸収することが可能となり、そのことにより有機ＥＬ素子の寿命を延ばすことが可能となる。 As shown in Table 1, the organic EL device of Comparative Example 1 had half the luminance half time compared to the organic EL device of the example. That is, it is possible to double the lifetime of the organic EL element that is thinned by directly attaching the moisture absorbing layer 17 to the second electrode 14. By opening the hole 18 in the second electrode 14, the moisture absorption layer 17 comes close to the light emitting layer 13 through the hole 18, so that moisture and oxygen mixed in the light emitting layer 13 can be effectively absorbed. As a result, the lifetime of the organic EL element can be extended.
１　　　有機ＥＬ素子
１０　　素子部
１１　　フィルム基板
１２　　第１の電極
１３　　発光層
１４　　第２の電極
１５　　第１の補助電極
１６　　第２の補助電極
１７　　吸湿層
１８　　孔
２０　　封止部
２１　　上部封止フィルム
２２　　下部封止フィルム
２５　　封止接着剤層
３１　　電極フィルム
３２　　孔空きフィルム基板
３３　　ＬｉＦ層
３４　　Ａｌ層
３５　　Ａｌ／ＬｉＦ層 DESCRIPTION OF SYMBOLS 1 Organic EL element 10 Element part 11 Film substrate 12 1st electrode 13 Light emitting layer 14 2nd electrode 15 1st auxiliary electrode 16 2nd auxiliary electrode 17 Hygroscopic layer 18 Hole 20 Sealing part 21 Upper sealing film 22 Lower sealing film 25 Sealing adhesive layer 31 Electrode film 32 Perforated film substrate 33 LiF layer 34 Al layer 35 Al / LiF layer

Claims (3)

  1. 　有機発光材料により構成される平面形状の発光層と、
    　前記発光層の一方の面に形成される第１の電極と、
    　前記発光層の他方の面に形成される第２の電極と、
    　吸湿物質により構成される吸湿層と
    により構成される素子部と、
    　前記素子部を被覆して封止する外装体と
    　により構成される有機ＥＬ素子であって、
    　前記第２の電極には孔が空いており、
    　前記吸湿層が、前記第２の電極に対して、前記発光層が設けられた側とは反対側の面に形成されることを特徴とする有機ＥＬ素子。     A planar light emitting layer composed of an organic light emitting material;
    A first electrode formed on one surface of the light emitting layer;
    A second electrode formed on the other surface of the light emitting layer;
    An element part constituted by a moisture absorbing layer constituted by a moisture absorbing substance;
    An organic EL element constituted by an exterior body that covers and seals the element part,
    The second electrode is perforated;
    The organic EL element, wherein the moisture absorption layer is formed on a surface opposite to the side where the light emitting layer is provided with respect to the second electrode.
  2. 　前記第１の電極は前記発光層に正孔を注入する陽極であり、前記第２の電極は前記発光層に電子を注入する陰極であることを特徴とする請求項１に記載の有機ＥＬ素子。 2. The organic EL device according to claim 1, wherein the first electrode is an anode for injecting holes into the light emitting layer, and the second electrode is a cathode for injecting electrons into the light emitting layer. .
  3. 　有機発光材料により構成される発光層と、
    　前記発光層の一方の面に形成される第１の電極と、
    　前記発光層の他方の面に形成される、孔が空いている第２の電極と、
    　前記第２の電極に対して、前記発光層が設けられた側とは反対側の面に形成される、吸湿物質により構成される吸湿層と
    により構成される素子部と、
    　前記素子部を被覆して封止する外装体とにより構成される有機ＥＬ素子を製造する有機ＥＬ素子製造方法であって、
    　前記第２の電極は、前記発光層に対し、孔の空いている電極フィルムを、ラミネート法にて貼り付けることにより形成されることを特徴とする有機ＥＬ素子製造方法。     A light emitting layer composed of an organic light emitting material;
    A first electrode formed on one surface of the light emitting layer;
    A second electrode having a hole formed on the other surface of the light emitting layer;
    An element part constituted by a hygroscopic layer made of a hygroscopic substance formed on a surface opposite to the side on which the light emitting layer is provided with respect to the second electrode;
    An organic EL element manufacturing method for manufacturing an organic EL element constituted by an exterior body covering and sealing the element portion,
    The method for producing an organic EL element, wherein the second electrode is formed by laminating an electrode film having a hole to the light emitting layer by a laminating method.
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