JP2010176928A - Organic el light-emitting device - Google Patents

Organic el light-emitting device Download PDF

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JP2010176928A
JP2010176928A JP2009016036A JP2009016036A JP2010176928A JP 2010176928 A JP2010176928 A JP 2010176928A JP 2009016036 A JP2009016036 A JP 2009016036A JP 2009016036 A JP2009016036 A JP 2009016036A JP 2010176928 A JP2010176928 A JP 2010176928A
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refractive index
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JP5179392B2 (en
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Masahiro Nakamura
将啓 中村
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Panasonic Electric Works Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL light emitting device utilizing light emission of an organic EL in which light extraction efficiency is improved. <P>SOLUTION: The organic EL light emitting device 1 is provided with an organic EL layer 2 and a substrate 3 having translucency, and light from the organic EL layer 2 is extracted through the substrate 3. A gradient refractive index layer 4 which has a gradient so that the refractive index becomes higher as it goes from the substrate 3 side toward the organic EL layer 2 side is further provided between the organic EL layer 2 and the substrate 3. The gradient refractive index layer 4 has a convex part 45 which upheaves from the organic EL layer 2 side toward the substrate 3 side viewed in cross-section when the region having the same refractive index is seen, and these convex parts 45 are distributed adjoined plurally in the face. Thereby, since the light incident into the gradient refractive index layer 4 is refracted to the optical axis 46 direction of the convex part 45, the incident angle to the substrate 3 becomes small and reflection of light on the interfaces 31, 32 of the substrate 3 is prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、有機エレクトロルミネッセンス（以下、有機ＥＬ）の発光を利用した有機ＥＬ発光装置に関する。   The present invention relates to an organic EL light emitting device using light emission of organic electroluminescence (hereinafter referred to as organic EL).

従来から、有機物を発光させて面光源を得る有機ＥＬ素子が知られている。図３は、有機ＥＬ素子１００の一般的な構成を示す。有機ＥＬ素子１００は、透明な基板１０１の一方の面上に、透明電極である陽極１０２、有機層１０３、及び金属電極である陰極１０４の各層が、この順に積層されて形成される。陽極１０２と陰極１０４の間に通電することによって、陽極１０２側から有機層１０３にホールが注入され、陰極１０４側から電子が注入される。有機層１０３は、注入されたホールと電子の再結合によって発光し、その光が、陽極１０２と基板１０１を通して取り出される。   Conventionally, an organic EL element that obtains a surface light source by emitting an organic substance is known. FIG. 3 shows a general configuration of the organic EL element 100. The organic EL element 100 is formed by laminating layers of an anode 102 as a transparent electrode, an organic layer 103, and a cathode 104 as a metal electrode in this order on one surface of a transparent substrate 101. By energizing between the anode 102 and the cathode 104, holes are injected into the organic layer 103 from the anode 102 side, and electrons are injected from the cathode 104 side. The organic layer 103 emits light by recombination of the injected holes and electrons, and the light is extracted through the anode 102 and the substrate 101.

ここで、基板１０１は、ガラス等から成り、その屈折率が空気の屈折率よりも高い。このため、基板１０１内から空気との界面に比較的小さい入射角で入射する光は、空気中に出射されるが、それ以外の光は、矢印Ｌ１０１で示すように、空気との界面で反射され、基板１０１内において端部方向に導波されて消失し、有機ＥＬ素子１００から取り出すことができない。また、陽極１０２は、通常、ＩＴＯ（Indium Tin Oxide）から成り、その屈折率が約１．９〜２．０と他層と比較して高い。このため、矢印Ｌ１０２で示すように、他層との界面で反射して陽極１０２内を端部方向に導波される導波光が生じる。これらの界面での反射のため、有機ＥＬ素子１００の光取り出し効率が低くなっている。   Here, the substrate 101 is made of glass or the like, and its refractive index is higher than that of air. For this reason, light that enters the interface with the air from the inside of the substrate 101 at a relatively small incident angle is emitted into the air, but other light is reflected at the interface with the air as indicated by an arrow L101. Then, the light is guided in the end direction in the substrate 101 and disappears, and cannot be taken out from the organic EL element 100. The anode 102 is usually made of ITO (Indium Tin Oxide), and its refractive index is about 1.9 to 2.0, which is higher than that of other layers. For this reason, as indicated by an arrow L102, guided light that is reflected at the interface with the other layer and guided in the end direction in the anode 102 is generated. Due to the reflection at these interfaces, the light extraction efficiency of the organic EL element 100 is low.

そこで、基板の透光性を低くすることによって、基板内で光を散乱させて界面での反射を軽減し、光取り出し効率の向上を図った有機ＥＬ素子が知られている（例えば、特許文献１参照）。また、基板と陽極との間に光を散乱する光散乱層を設けることによって、界面での反射を軽減して、光取り出し効率の向上を図った有機ＥＬ素子が知られている（例えば、特許文献２参照）。しかしながら、上述したような有機ＥＬ素子では、光の散乱による光損失が生じるため、光取り出し効率の向上効果が十分ではない。   Therefore, an organic EL element is known in which light transmission within the substrate is reduced to reduce reflection at the interface by reducing the translucency of the substrate, thereby improving light extraction efficiency (for example, Patent Documents). 1). In addition, there is known an organic EL element in which a light scattering layer that scatters light between a substrate and an anode is provided to reduce reflection at the interface and improve light extraction efficiency (for example, a patent) Reference 2). However, in the organic EL element as described above, light loss due to light scattering occurs, so that the effect of improving the light extraction efficiency is not sufficient.

特開２００５−３８６６１号公報JP 2005-38661 A 特開２００５−６３７０４号公報JP 2005-63704 A

本発明は、上記問題を解決するものであり、有機ＥＬの発光を利用した有機ＥＬ発光装置において、光取り出し効率を向上することを目的とする。   The present invention solves the above problem, and an object of the present invention is to improve light extraction efficiency in an organic EL light emitting device using light emission of an organic EL.

上記目的を達成するために請求項１の発明は、有機ＥＬ層と、透光性を有する基板と、を備え、前記有機ＥＬ層からの光が前記基板を通して取り出される有機ＥＬ発光装置であって、前記有機ＥＬ層と前記基板との間に、基板側から有機ＥＬ層側に向かうにつれ屈折率が高くなるように勾配を持った勾配屈折率層をさらに備え、前記勾配屈折率層は、同じ屈折率を持つ領域を見たとき、断面視で前記有機ＥＬ層側から前記基板側に向かって隆起した凸状部を持ち、この凸状部が面的に複数、隣接して分布しているものである。   In order to achieve the above object, an invention according to claim 1 is an organic EL light emitting device comprising an organic EL layer and a light-transmitting substrate, wherein light from the organic EL layer is extracted through the substrate. And a gradient refractive index layer having a gradient so that the refractive index increases from the substrate side toward the organic EL layer side between the organic EL layer and the substrate, and the gradient refractive index layer is the same When a region having a refractive index is seen, it has a convex portion that protrudes from the organic EL layer side to the substrate side in a cross-sectional view, and a plurality of the convex portions are distributed adjacent to each other. Is.

請求項２の発明は、請求項１に記載の有機ＥＬ発光装置において、前記勾配屈折率層における屈折率は、前記有機ＥＬ層側が該有機ＥＬ層の屈折率と略同じとし、前記基板側が該基板の屈折率と略同じとしたものである。   According to a second aspect of the present invention, in the organic EL light-emitting device according to the first aspect, the refractive index of the gradient refractive index layer is substantially the same as the refractive index of the organic EL layer on the organic EL layer side, and This is approximately the same as the refractive index of the substrate.

請求項３の発明は、請求項１又は請求項２に記載の有機ＥＬ発光装置において、前記基板の前記勾配屈折率層とは反対側の面上に、前記勾配屈折率層の凸状部の各々に対応して、凸レンズを有するものである。   According to a third aspect of the present invention, in the organic EL light-emitting device according to the first or second aspect, a convex portion of the gradient refractive index layer is formed on a surface of the substrate opposite to the gradient refractive index layer. Corresponding to each, it has a convex lens.

請求項１の発明によれば、有機ＥＬ層から放出され勾配屈折率層に入射した光は、凸状部の光軸方向に屈折されて基板に入射するため、勾配屈折率層が設けられていない場合に比べて基板への入射角が小さくなる。このため、基板へ光が入射される界面及び基板から光が出射される界面での反射が防止されるので、光取り出し効率が向上する。   According to the first aspect of the present invention, since the light emitted from the organic EL layer and incident on the gradient refractive index layer is refracted in the optical axis direction of the convex portion and enters the substrate, the gradient refractive index layer is provided. The incident angle to the substrate is smaller than in the case where there is no substrate. For this reason, reflection at the interface where light is incident on the substrate and the interface where light is emitted from the substrate is prevented, so that the light extraction efficiency is improved.

請求項２の発明によれば、有機ＥＬ層と勾配屈折率層間の界面、及び勾配屈折率層と基板間の界面での屈折率差がほぼ無くなるので、これら界面での光の反射が防止され、光取り出し効率が向上する。   According to the invention of claim 2, since the refractive index difference at the interface between the organic EL layer and the gradient refractive index layer and between the gradient refractive index layer and the substrate is almost eliminated, reflection of light at these interfaces is prevented. The light extraction efficiency is improved.

請求項３の発明によれば、基板から取り出される光は、基板上に配置された凸レンズに入射し、凸レンズによって空気との界面での反射が防止されて取り出されるので、光取り出し効率が向上する。   According to the third aspect of the present invention, the light extracted from the substrate is incident on the convex lens disposed on the substrate, and the convex lens prevents the light from being reflected at the interface with the air, so that the light extraction efficiency is improved. .

本発明の第１の実施形態に係る有機ＥＬ発光装置の端面図。1 is an end view of an organic EL light emitting device according to a first embodiment of the present invention. 本発明の第２の実施形態に係る有機ＥＬ発光装置の端面図。The end view of the organic electroluminescent light-emitting device which concerns on the 2nd Embodiment of this invention. 一般的な有機ＥＬ素子の断面図。Sectional drawing of a general organic EL element.

（第１の実施形態）
本発明の第１の実施形態に係る有機ＥＬ発光装置を図１及び図２を参照して説明する。図１に示されるように、有機ＥＬ発光装置１は、有機ＥＬ層２と、透光性を有する基板３と、有機ＥＬ層２と基板３との間に設けられた屈折率に勾配を持たせた勾配屈折率層４とを備える。この勾配屈折率層４は、基板３側から有機ＥＬ層２側に向かうにつれ屈折率が高くなるように勾配を持たせている。さらに、この勾配屈折率層４は、同じ屈折率を持つ領域を見たとき、断面視で有機ＥＬ層２側から基板３側に向かって隆起した凸状部４５を持ち、この凸状部４５が面的に複数、隣接して分布している。 (First embodiment)
An organic EL light emitting device according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the organic EL light-emitting device 1 has a gradient in the refractive index provided between the organic EL layer 2, the translucent substrate 3, and the organic EL layer 2 and the substrate 3. The gradient refractive index layer 4 is provided. The gradient refractive index layer 4 has a gradient so that the refractive index increases from the substrate 3 side toward the organic EL layer 2 side. Further, the gradient refractive index layer 4 has a convex portion 45 that protrudes from the organic EL layer 2 side to the substrate 3 side in a sectional view when the region having the same refractive index is viewed. Are distributed adjacent to each other.

有機ＥＬ層２は、透明電極である陽極２１、有機層２２、及び陰極２３の各層が、この順に、例えば、真空蒸着法によって積層されて成る面発光光源である。各層の材料は、例えば、陽極２１がＩＴＯ（Indium Tin Oxide）、有機層２２がアルミ錯体（Ａｌｑ３）、陰極２３がアルミニウム等の金属である。陽極２１と陰極２３間に通電することによって、有機層２２から光が放出される。有機層２２から放出された光は、矢印Ｌ１で示すように、透明な陽極２１、勾配屈折率層４及び基板３を通して外部に取り出される。金属から成る陰極２３は、有機層２２からの光を基板３側に反射する。有機ＥＬ層２は、さらに他の層を有してもよく、例えば、陽極２１と有機層２２との間に、アリールアミン類等から成るホール輸送層を設けてもよいし、有機層２２と陰極２３の間にリチウム錯体等から成る電子注入層を設けてもよい。 The organic EL layer 2 is a surface emitting light source in which the anode 21, the organic layer 22, and the cathode 23, which are transparent electrodes, are laminated in this order by, for example, a vacuum deposition method. For example, the anode 21 is made of ITO (Indium Tin Oxide), the organic layer 22 is made of an aluminum complex (Alq 3 ), and the cathode 23 is made of a metal such as aluminum. By energizing between the anode 21 and the cathode 23, light is emitted from the organic layer 22. The light emitted from the organic layer 22 is extracted to the outside through the transparent anode 21, the gradient refractive index layer 4, and the substrate 3 as indicated by an arrow L 1. The cathode 23 made of metal reflects light from the organic layer 22 toward the substrate 3 side. The organic EL layer 2 may further include other layers. For example, a hole transport layer made of an arylamine or the like may be provided between the anode 21 and the organic layer 22. An electron injection layer made of a lithium complex or the like may be provided between the cathodes 23.

基板３は、平板状の例えばガラス又はアクリル樹脂等から成る。発光装置１の製造に際しては、この基板３上に勾配屈折率層４が形成され、さらに、この勾配屈折率層４上に有機ＥＬ層２の各層が陽極２１から陰極２３まで順に成膜される。基板３の屈折率は約１．５であり、陽極２１の屈折率は、約１．９〜２．０と、基板３の屈折率よりも高い。   The substrate 3 is made of a flat plate such as glass or acrylic resin. In manufacturing the light emitting device 1, the gradient refractive index layer 4 is formed on the substrate 3, and each layer of the organic EL layer 2 is sequentially formed on the gradient refractive index layer 4 from the anode 21 to the cathode 23. . The refractive index of the substrate 3 is about 1.5, and the refractive index of the anode 21 is about 1.9 to 2.0, which is higher than the refractive index of the substrate 3.

勾配屈折率層４は、有機ＥＬ層２側に屈折率が高い高屈折率領域４１と、基板３側に屈折率が低い低屈折率領域４４とを有し、高屈折率領域４１と低屈折率領域４４との間にそれらの屈折率の中間の屈折率を有する層状の領域４２、４３を有する。これらの各領域４１〜４４は、例えば、低屈折率領域４４から順に形成される。ここに、高屈折率領域４１の屈折率は、陽極２１のそれに近いか、又は少し小さいものとし、低屈折率領域４４の屈折率は、基板３のそれに近いか、又は少し大きいものとすることが望ましい。層状の領域４２、４３の屈折率は、低屈折率領域４４から高屈折率領域４１に向かうにつれて高くなるようにする。これにより、勾配屈折率層４の屈折率は、基板３側から有機ＥＬ層２側に向かうにつれて段階的に高くなるような勾配を持つ。勾配屈折率層４内の層状の領域の層数は、図示のように４層に限定されるものではなく、層数を増やすことにより、勾配屈折率層４の屈折率が実質的に連続的な勾配を持つようにしてもよい。   The gradient refractive index layer 4 includes a high refractive index region 41 having a high refractive index on the organic EL layer 2 side and a low refractive index region 44 having a low refractive index on the substrate 3 side. Between the refractive index region 44, layered regions 42 and 43 having a refractive index intermediate between those refractive indexes are provided. Each of these regions 41 to 44 is formed sequentially from the low refractive index region 44, for example. Here, the refractive index of the high refractive index region 41 is close to or slightly smaller than that of the anode 21, and the refractive index of the low refractive index region 44 is close to or slightly larger than that of the substrate 3. Is desirable. The refractive indexes of the layered regions 42 and 43 are set to increase from the low refractive index region 44 toward the high refractive index region 41. Thereby, the refractive index of the gradient refractive index layer 4 has a gradient that increases stepwise from the substrate 3 side toward the organic EL layer 2 side. The number of layered regions in the gradient refractive index layer 4 is not limited to four as shown in the figure. By increasing the number of layers, the refractive index of the gradient refractive index layer 4 is substantially continuous. You may make it have a gentle gradient.

低屈折率領域４４は、その上面が凹んだ数μｍ〜数ｍｍオーダーの面的な繰り返し構造を有し、ナノインプリント等によって基板３上に形成される。ナノインプリントにおいて、低屈折率領域４４は、屈折率が約１．５のガラス又はアクリル樹脂に、所定形状が刻み込まれた金型が押し付けられて形状が転写される。低屈折率領域４４は、形状が転写された後、ＵＶ（紫外線）硬化又は熱硬化等によって形状が固定される。   The low-refractive index region 44 has a planar repetitive structure on the order of several μm to several mm with the upper surface recessed, and is formed on the substrate 3 by nanoimprinting or the like. In the nanoimprint, the shape of the low refractive index region 44 is transferred by pressing a mold having a predetermined shape into glass or acrylic resin having a refractive index of about 1.5. After the shape is transferred, the shape of the low refractive index region 44 is fixed by UV (ultraviolet) curing or heat curing.

低屈折率領域４４上に、エポキシ樹脂又はポリスチレン等から成る屈折率が約１．５〜１．６の領域４３が厚さ数μｍオーダーの層状に形成される。領域４３上に、ポリイミド樹脂等から成る屈折率が約１．６〜１．７の領域４２が厚さ数μｍオーダーの層状に形成される。領域４２上に、ＴｉＯ２粒子を含有するポリイミド樹脂等（株式会社オプトメイト社製、ＨＲ１７８３等）から成る屈折率約１．７〜１．８の高屈折率領域４１が形成される。高屈折率領域４１は、領域４２の凹形状を充填して上面が平坦とされる。これらの高屈折率領域４１並びに領域４２及び領域４３は、スピンコートにより形成される。高屈折率領域４１及び領域４２、４３は、断面視で有機ＥＬ層側から基板３側に向かって山形に隆起した凸状部４５を成し、この凸状部４５が互いに面的に隣接してハニカム状又は格子状に分布している。高屈折率領域４１上には、有機ＥＬ層２の陽極２１が形成される。 On the low refractive index region 44, a region 43 having a refractive index of about 1.5 to 1.6 made of epoxy resin or polystyrene or the like is formed in a layer form having a thickness of several μm order. On the region 43, a region 42 made of polyimide resin or the like and having a refractive index of about 1.6 to 1.7 is formed in a layer shape having a thickness of several μm order. On the region 42, a high refractive index region 41 having a refractive index of about 1.7 to 1.8 made of a polyimide resin containing TiO 2 particles or the like (manufactured by Optmate Co., Ltd., HR1783) is formed. The high refractive index region 41 fills the concave shape of the region 42 and has a flat upper surface. The high refractive index region 41, the region 42, and the region 43 are formed by spin coating. The high refractive index region 41 and the regions 42 and 43 form a convex portion 45 that is raised in a mountain shape from the organic EL layer side to the substrate 3 side in a cross-sectional view, and the convex portions 45 are adjacent to each other in a plane. Distributed in a honeycomb or lattice shape. On the high refractive index region 41, the anode 21 of the organic EL layer 2 is formed.

上記のように構成された発光装置１において、勾配屈折率層４の各凸状部４５は、断面視で基板３側から有機ＥＬ層２側に向かうにつれて屈折率が高く、一平面で切って視たとき、中心部の屈折率が周辺部の屈折率より高くなっており、このような屈折率の分布によって光を屈折するグリンレンズ（Graded Index Lens）を成している。この凸状部４５内の光は、屈折率が高い方向に屈折される。従って、有機ＥＬ層２から放出され勾配屈折率層４に入射した光は、矢印Ｌ１で示すように、凸状部４５の中心軸、すなわちグリンレンズとしての光軸４６方向に屈折されて基板３に入射するため、勾配屈折率層４が設けられていない場合に比べて基板３への入射角が小さくなる。このため、基板３へ光が入射される界面３１及び基板３から光が出射される界面３２での反射が防止されるので、発光装置１の光取り出し効率が向上する。   In the light emitting device 1 configured as described above, each convex portion 45 of the gradient refractive index layer 4 has a higher refractive index from the substrate 3 side toward the organic EL layer 2 side in a cross-sectional view, and is cut in one plane. When viewed, the refractive index of the central portion is higher than the refractive index of the peripheral portion, and a refractive index lens is formed that refracts light by such a refractive index distribution. The light in the convex portion 45 is refracted in the direction where the refractive index is high. Therefore, the light emitted from the organic EL layer 2 and incident on the gradient refractive index layer 4 is refracted in the direction of the central axis of the convex portion 45, that is, the optical axis 46 as a green lens, as indicated by an arrow L1, and is then applied to the substrate 3. Therefore, the angle of incidence on the substrate 3 is smaller than when the gradient refractive index layer 4 is not provided. For this reason, reflection at the interface 31 where light is incident on the substrate 3 and the interface 32 where light is emitted from the substrate 3 is prevented, so that the light extraction efficiency of the light emitting device 1 is improved.

また、勾配屈折率層４における屈折率を、有機ＥＬ層２側が有機ＥＬ層２の屈折率と略同じとし、基板３側が基板３の屈折率と略同じとすることにより、有機ＥＬ層２と勾配屈折率層４間の界面、及び勾配屈折率層４と基板３間の界面での屈折率差がほぼ無くなるので、これらの界面での光の反射が防止され、発光装置１の光取り出し効率が向上する。   Further, the refractive index in the gradient refractive index layer 4 is set to be substantially the same as the refractive index of the organic EL layer 2 on the organic EL layer 2 side and substantially the same as the refractive index of the substrate 3 on the substrate 3 side. Since the refractive index difference at the interface between the gradient refractive index layer 4 and the interface between the gradient refractive index layer 4 and the substrate 3 is almost eliminated, reflection of light at these interfaces is prevented, and the light extraction efficiency of the light emitting device 1 is reduced. Will improve.

（第２の実施形態）
本発明の第２の実施形態に係る発光装置を図２を参照して説明する。本実施形態の発光装置１０は、第１の実施形態と同様の構成に加え、基板３の勾配屈折率層４とは反対側の面３３上に、勾配屈折率層４の凸状部４５の各々に対応して、凸レンズ５を有する。なお、図２において凸レンズ５の断面ハッチングは図示を省いている。 (Second Embodiment)
A light emitting device according to a second embodiment of the present invention will be described with reference to FIG. In addition to the same configuration as that of the first embodiment, the light emitting device 10 of the present embodiment has a convex portion 45 of the gradient refractive index layer 4 on the surface 33 opposite to the gradient refractive index layer 4 of the substrate 3. Corresponding to each, a convex lens 5 is provided. In FIG. 2, the sectional hatching of the convex lens 5 is not shown.

凸レンズ５は、例えば、アクリル等の透光性樹脂を成型したものであり、略半楕円断面形状を有し、基板３から光が出射される側が凸形状である。各凸レンズ５の光軸は、勾配屈折率層４の凸状部４５の光軸４６上と一致し、基板３の法線方向となる。凸レンズ５の平面形状は、円形又は凸状部４５の平面形状に対応する正六角形等の多角形である。凸レンズ５の屈折率は、基板３の屈折率と略同じとすることが好ましい。   The convex lens 5 is formed by molding a translucent resin such as acrylic, for example, has a substantially semi-elliptical cross-sectional shape, and the side from which light is emitted from the substrate 3 has a convex shape. The optical axis of each convex lens 5 coincides with the optical axis 46 of the convex portion 45 of the gradient refractive index layer 4 and is in the normal direction of the substrate 3. The planar shape of the convex lens 5 is a circle or a polygon such as a regular hexagon corresponding to the planar shape of the convex portion 45. The refractive index of the convex lens 5 is preferably substantially the same as the refractive index of the substrate 3.

上記のように構成された発光装置１０において、有機層２２から放出され、基板３を通して取り出される光は、矢印Ｌ２で示すように、基板３上に配置された凸レンズ５に入射し、凸レンズ５によって空気との界面での反射が防止されて取り出される。これにより、上記のような凸レンズ５が設けられていない場合に比べて、発光装置１０の光取り出し効率が向上する。   In the light emitting device 10 configured as described above, the light emitted from the organic layer 22 and extracted through the substrate 3 is incident on the convex lens 5 disposed on the substrate 3 as indicated by the arrow L2, and is projected by the convex lens 5. Reflection at the interface with air is prevented and taken out. Thereby, compared with the case where the above convex lenses 5 are not provided, the light extraction efficiency of the light-emitting device 10 improves.

なお、本発明は、上記の実施形態の構成に限られず、発明の要旨を変更しない範囲で種々の変形が可能である。例えば、勾配屈折率層４の各領域の形成方法、材料は、上記の構成に限られるものではなく、勾配屈折率層４の各領域は、ポリイミド樹脂等の透光性樹脂を用いて、蒸着、スプレー、スクリーン印刷、インクジェット等により形成してもよく、透光性樹脂に酸化モリブデン等の屈折率調整剤を添加し、その添加濃度によって屈折率を調整してもよい。また、上記では勾配屈折率層４として、多層のものを示したが、１層であって連続的に屈折率が変化したものであっても構わない。   In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the formation method and material of each region of the gradient refractive index layer 4 are not limited to the above configuration, and each region of the gradient refractive index layer 4 is vapor-deposited using a translucent resin such as polyimide resin. Alternatively, it may be formed by spraying, screen printing, ink jetting, or the like, and a refractive index adjusting agent such as molybdenum oxide may be added to the translucent resin, and the refractive index may be adjusted depending on the addition concentration. In the above description, a multi-layered gradient refractive index layer 4 is shown. However, the gradient refractive index layer 4 may be a single layer whose refractive index continuously changes.

１、１０ 有機ＥＬ発光装置
２ 有機ＥＬ層
２１ 陽極
２２ 有機層
２３ 陰極
３ 基板
４ 勾配屈折率層
４５ 凸状部
５ 凸レンズ DESCRIPTION OF SYMBOLS 1, 10 Organic EL light-emitting device 2 Organic EL layer 21 Anode 22 Organic layer 23 Cathode 3 Substrate 4 Gradient refractive index layer 45 Convex part 5 Convex lens

Claims (3)

有機ＥＬ層と、透光性を有する基板と、を備え、前記有機ＥＬ層からの光が前記基板を通して取り出される有機ＥＬ発光装置であって、
前記有機ＥＬ層と前記基板との間に、基板側から有機ＥＬ層側に向かうにつれ屈折率が高くなるように勾配を持った勾配屈折率層をさらに備え、
前記勾配屈折率層は、
同じ屈折率を持つ領域を見たとき、断面視で前記有機ＥＬ層側から前記基板側に向かって隆起した凸状部を持ち、
この凸状部が面的に複数、隣接して分布していることを特徴とする有機ＥＬ発光装置。 An organic EL light emitting device comprising an organic EL layer and a substrate having translucency, wherein light from the organic EL layer is extracted through the substrate,
Further comprising a gradient refractive index layer having a gradient between the organic EL layer and the substrate so that the refractive index increases from the substrate side toward the organic EL layer side,
The gradient refractive index layer is
When looking at a region having the same refractive index, it has a convex portion raised from the organic EL layer side to the substrate side in a cross-sectional view,
An organic EL light emitting device characterized in that a plurality of the convex portions are distributed adjacent to each other. 前記勾配屈折率層における屈折率は、前記有機ＥＬ層側が該有機ＥＬ層の屈折率と略同じとし、
前記基板側が該基板の屈折率と略同じとしたことを特徴とする請求項１に記載の有機ＥＬ発光装置。 The refractive index in the gradient refractive index layer is substantially the same as the refractive index of the organic EL layer on the organic EL layer side,
The organic EL light-emitting device according to claim 1, wherein the substrate side has substantially the same refractive index as the substrate. 前記基板の前記勾配屈折率層とは反対側の面上に、前記勾配屈折率層の凸状部の各々に対応して、凸レンズを有することを特徴とする請求項１又は請求項２に記載の有機ＥＬ発光装置。   3. A convex lens is provided on the surface of the substrate opposite to the gradient refractive index layer, corresponding to each convex portion of the gradient refractive index layer. Organic EL light emitting device.
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