JP2010146955A - Organic el light-emitting device - Google Patents

Organic el light-emitting device Download PDF

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JP2010146955A
JP2010146955A JP2008325772A JP2008325772A JP2010146955A JP 2010146955 A JP2010146955 A JP 2010146955A JP 2008325772 A JP2008325772 A JP 2008325772A JP 2008325772 A JP2008325772 A JP 2008325772A JP 2010146955 A JP2010146955 A JP 2010146955A
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Masahiro Nakamura
将啓 中村
Kenichiro Tanaka
健一郎 田中
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Panasonic Electric Works Co Ltd
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Abstract

【課題】有機発光層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。
【解決手段】有機ＥＬ発光装置１は、基板３と、この基板３上に形成された有機ＥＬ層２とを備え、有機ＥＬ層２からの光が基板３を通して取り出される。基板３は、光取り出し面３２に互いに隣接すると共に、離間配置された複数の出射面３３と、これら出射面３３の間に形成されたＶ字状の溝４と、この溝形成面に設けられた反射面４１とを有する。基板３の光取り出し面３２上にレンズ５を備える。レンズ５は、出射面３３の各々の周縁の互いに対称な点を第１焦点５１ａ及び第２焦点５１ｂとする略半楕円断面形状を有し、互いに隣合うレンズ５が平面視多角形の辺５２で接する。これにより、有機ＥＬ層２から出射された光が、基板３の出射面３３からレンズ５に入射して取り出される。
【選択図】図１Light extraction efficiency is improved in an organic EL light emitting device using light emission of an organic light emitting layer.
An organic EL light emitting device includes a substrate and an organic EL layer formed on the substrate, and light from the organic EL layer is extracted through the substrate. The substrate 3 is provided adjacent to the light extraction surface 32 and spaced apart from each other, a V-shaped groove 4 formed between the emission surfaces 33, and the groove formation surface. And a reflective surface 41. The lens 5 is provided on the light extraction surface 32 of the substrate 3. The lens 5 has a substantially semi-elliptical cross-sectional shape in which the first focus 51a and the second focus 51b are symmetrical points on the periphery of each of the emission surfaces 33, and the adjacent lenses 5 are sides 52 of a polygon in plan view. Contact with. Thereby, the light emitted from the organic EL layer 2 enters the lens 5 from the emission surface 33 of the substrate 3 and is extracted.
[Selection] Figure 1

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発光光源を得る有機ＥＬ素子が知られている。図６は、有機ＥＬ素子１００の一般的な構成を示す。有機ＥＬ素子１００は、透明電極の陽極１０２、ホール輸送層１０３、有機発光層１０４、電子注入層１０５、及び金属電極の陰極１０６の各層が、透明な基板１０１の一方の面上に、この順に積層されて形成される。陽極１０２と陰極１０６の間に通電することによって、陽極１０２側からホールが注入され、陰極１０６側から電子が注入される。有機発光層１０４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。   2. Description of the Related Art Conventionally, an organic EL element that obtains a surface light source by emitting an organic substance is known. FIG. 6 shows a general configuration of the organic EL element 100. The organic EL element 100 includes a transparent electrode anode 102, a hole transport layer 103, an organic light emitting layer 104, an electron injection layer 105, and a metal electrode cathode 106 on one surface of a transparent substrate 101 in this order. It is formed by stacking. By energizing between the anode 102 and the cathode 106, holes are injected from the anode 102 side, and electrons are injected from the cathode 106 side. The organic light emitting layer 104 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１０７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Ｌ１０１は、その界面１０７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。この界面１０７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 107 with the air from the inside of the substrate 101 at a relatively small incident angle is emitted into the air, but the other light L101 is reflected at the interface 107 and is reflected in the substrate 101. The light is guided in the end direction and disappears, and cannot be taken out from the organic EL element 100. Due to the reflection at the interface 107, 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、基板内部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）。しかしながら、上述したような有機ＥＬ素子では、基板の透光性を低くすること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。
特開２００５−３８６６１号公報 Thus, 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). However, in the organic EL element as described above, light loss due to lowering the translucency of the substrate occurs, so that the effect of improving the light extraction efficiency is not sufficient.
JP 2005-38661 A

本発明は、上記問題を解決するものであり、有機発光層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-described problems, 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 light emitting layer.

上記目的を達成するために請求項１の発明は、基板と、この基板上に形成された有機ＥＬ層と、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、前記基板は、前記有機ＥＬ層が形成されている面とは反対側面を光取り出し面とし、この光取り出し面に互いに隣接すると共に離間配置された複数の出射面と、これら隣接する出射面の間に形成されたＶ字状の溝と、この溝形成面に設けられた反射面とを有するものである。   In order to achieve the above object, an invention according to claim 1 is an organic EL light emitting device comprising a substrate and an organic EL layer formed on the substrate, wherein light from the organic EL layer is extracted through the substrate. The substrate has a side surface opposite to the surface on which the organic EL layer is formed as a light extraction surface, a plurality of emission surfaces adjacent to and spaced from the light extraction surface, and the adjacent emission surfaces. It has a V-shaped groove formed between the surfaces and a reflecting surface provided on the groove forming surface.

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、前記基板の光取り出し面上に前記出射面の各々に対応して形成されたレンズをさらに備え、前記レンズは、前記出射面の各々の周縁の互いに対称な点を第１焦点及び第２焦点とする略半楕円断面形状を有し、互いに隣合うレンズが平面視多角形の辺で接するものである。   According to a second aspect of the present invention, in the organic EL light-emitting device according to the first aspect of the present invention, the organic EL light-emitting device further includes a lens formed on the light extraction surface of the substrate corresponding to each of the emission surfaces. The lens has a substantially semi-elliptical cross-sectional shape in which the first and second focal points are symmetrical points on each peripheral edge of the surface, and adjacent lenses touch each other at the sides of the polygon in plan view.

請求項３の発明は、請求項２に記載の有機ＥＬ発光装置において、前記有機ＥＬ層は、陽極と、陰極と、前記陽極及び前記陰極の間に少なくとも有機発光層とを有し、前記陽極が前記基板上に形成されており、前記基板と前記レンズの屈折率は、前記陽極の屈折率と略同じであるものである。   According to a third aspect of the present invention, in the organic EL light emitting device according to the second aspect, the organic EL layer includes an anode, a cathode, and at least an organic light emitting layer between the anode and the cathode, and the anode Is formed on the substrate, and the refractive index of the substrate and the lens is substantially the same as the refractive index of the anode.

請求項４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、前記基板の有機ＥＬ層が形成されている面に、光を拡散透過する光拡散層が設けられているものである。   According to a fourth aspect of the present invention, in the organic EL light-emitting device according to the first or second aspect, a light diffusion layer that diffuses and transmits light is provided on the surface of the substrate on which the organic EL layer is formed. Is.

請求項１の発明によれば、面発光光源である有機ＥＬ層から基板に入射した光の多くが、隣接する出射面の間に形成されたＶ字状の溝形成面に反射面があることによって、基板上に離間配置された出射面から出射されるので、出射面が擬似的な点光源となる。この点光源は、レンズ等によって配光制御が容易であり、有機ＥＬ発光装置の光取り出し効率の向上が容易となる。   According to the first aspect of the present invention, most of the light incident on the substrate from the organic EL layer, which is a surface-emitting light source, has a reflection surface on the V-shaped groove forming surface formed between the adjacent emission surfaces. Thus, the light is emitted from the emission surfaces spaced apart on the substrate, so that the emission surface becomes a pseudo point light source. This point light source can be easily controlled by a lens or the like, and the light extraction efficiency of the organic EL light emitting device can be easily improved.

請求項２の発明によれば、基板から出射された光は、出射面を通ってレンズに入射し、レンズの凸面で反射されずに取り出されるので、光取り出し効率が向上する。また、複数の出射面が離間配置されるが、レンズの凸面全体から光が出射され、互いに隣り合うレンズが多角形の辺で接するように隙間無く形成されるので、有機ＥＬ発光装置は、光取り出し側の全面が発光するように配光制御される。   According to the second aspect of the present invention, the light emitted from the substrate enters the lens through the emission surface and is extracted without being reflected by the convex surface of the lens, so that the light extraction efficiency is improved. In addition, a plurality of emission surfaces are arranged apart from each other, but light is emitted from the entire convex surface of the lens, and the adjacent lenses are formed with no gap so that they are in contact with each other on the polygonal side. Light distribution is controlled so that the entire surface on the extraction side emits light.

請求項３の発明によれば、陽極と基板間の界面、及び基板とレンズ間の界面での屈折率差がほぼ無くなり、これら界面での光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 invention of claim 3, the refractive index difference at the interface between the anode and the substrate and the interface between the substrate and the lens is almost eliminated, and reflection of light at these interfaces is prevented, so that the light extraction efficiency is improved. To do.

請求項４の発明によれば、有機ＥＬ層から出射された光は、光拡散層で拡散透過し、拡散透過によって全反射が軽減されて基板に入射し、レンズを通して取り出されるので、光取り出し効率が向上する。   According to the invention of claim 4, the light emitted from the organic EL layer diffuses and transmits through the light diffusion layer, and the total reflection is reduced by the diffuse transmission, enters the substrate, and is extracted through the lens. Will improve.

（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乃至図４を参照して説明する。図１は本実施形態の有機ＥＬ発光装置１（以下、発光装置という）の断面構成を示す。なお、図は端面を示し、レンズの断面ハッチングは図示を省いている。図２は発光装置１を光取り出し側から見た構成を示す。発光装置１は、有機ＥＬ層２と、これが形成される透光性の基板３とを備える。この発光装置１は、有機ＥＬ層２から放出される光を基板３を通して取り出すものである。 (First embodiment)
An organic EL light emitting device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a cross-sectional configuration of an organic EL light emitting device 1 (hereinafter referred to as a light emitting device) of the present embodiment. In addition, a figure shows an end surface and the cross-sectional hatching of a lens is abbreviate | omitting illustration. FIG. 2 shows a configuration of the light emitting device 1 viewed from the light extraction side. The light emitting device 1 includes an organic EL layer 2 and a translucent substrate 3 on which the organic EL layer 2 is formed. The light emitting device 1 extracts light emitted from the organic EL layer 2 through the substrate 3.

基板３は、有機ＥＬ層２が形成されている面３１とは反対側面を光取り出し面３２としており、光取り出し面３２は、互いに隣接すると共に離間配置された複数の出射面３３を有する。これら隣接する出射面３３の間に空気プリズム構造としてＶ字状の溝４が形成され、溝４の形成面は反射面４１となる。   The substrate 3 has a light extraction surface 32 opposite to the surface 31 on which the organic EL layer 2 is formed, and the light extraction surface 32 has a plurality of emission surfaces 33 that are adjacent to each other and spaced apart from each other. A V-shaped groove 4 is formed as an air prism structure between the adjacent emission surfaces 33, and the formation surface of the groove 4 becomes a reflection surface 41.

基板３は、例えば、ガラス又はポリスチレン等の樹脂から成る。基板３の光取り出し面３２上の出射面３３は、中心に対して点対称な平面形状とされ、略等間隔に離間配置され、Ｖ字状の溝４に囲まれている。Ｖ字状の溝４は、基板３に切削又は型による成型によって形成され、内部が空気であり、空気と基板３との屈折率差により、基板３内から反射面４１に入射する光を反射する。反射面４１は、アルミニウム又は銀等の金属を蒸着して反射率を高めてもよい。   The board | substrate 3 consists of resin, such as glass or a polystyrene, for example. The emission surface 33 on the light extraction surface 32 of the substrate 3 has a plane shape that is point-symmetric with respect to the center, is spaced apart at substantially equal intervals, and is surrounded by the V-shaped groove 4. The V-shaped groove 4 is formed on the substrate 3 by cutting or molding with a mold, and the inside is air, and reflects light incident on the reflecting surface 41 from the inside of the substrate 3 due to a difference in refractive index between the air and the substrate 3. To do. The reflective surface 41 may increase the reflectivity by evaporating a metal such as aluminum or silver.

発光装置１は、基板３の光取り出し面３２上に出射面３３の各々に対応してレンズ５が形成されている。レンズ５は、例えば、ポリスチレン又はアクリル等の透光性樹脂を成型したものであり、出射面３３の中心３３Ｃを含み基板３に直交する任意の断面において、出射面３３の周縁の互いに対称な点をそれぞれ第１焦点５１ａ、第２焦点５１ｂとする略半楕円断面形状を有し、発光装置１の光取り出し側が凸形状である。レンズ５の光軸５３は、出射面３３の中心３３Ｃを通り、基板３の法線方向となる。互いに隣り合うレンズ５は、平面視多角形の辺５２で接する。その多角形は、例えば、六角形であり、各レンズ５はハニカム状に接する。また、多角形を矩形とし、各レンズ５が格子状に接するようにしてもよい。なお、レンズ５は、略半楕円断面形状を有するが、多角形の辺５２で互いに隣接することから、光軸５３から周辺５２までの距離が一定ではなく、形成される凸レンズ形状は楕円面ではない。   In the light emitting device 1, the lens 5 is formed on the light extraction surface 32 of the substrate 3 corresponding to each of the emission surfaces 33. The lens 5 is formed by molding a translucent resin such as polystyrene or acrylic, for example, and is symmetrical with respect to the periphery of the emission surface 33 in an arbitrary cross section including the center 33C of the emission surface 33 and orthogonal to the substrate 3. Are substantially semi-elliptical cross-sectional shapes having a first focal point 51a and a second focal point 51b, respectively, and the light extraction side of the light emitting device 1 has a convex shape. The optical axis 53 of the lens 5 passes through the center 33 </ b> C of the emission surface 33 and is in the normal direction of the substrate 3. The adjacent lenses 5 are in contact with each other at a side 52 of the polygon in plan view. The polygon is, for example, a hexagon, and each lens 5 is in contact with the honeycomb. Further, the polygon may be rectangular and each lens 5 may be in contact with the grid. Although the lens 5 has a substantially semi-elliptical cross-sectional shape, the distance from the optical axis 53 to the periphery 52 is not constant because the polygonal sides 52 are adjacent to each other, and the formed convex lens shape is an elliptical surface. Absent.

図３は、一つのレンズ５の断面形状を示す。レンズ５に入射する光は、基板３の出射面３３から入射する。レンズ５は、出射面３３の各々の周縁の互いに対称な点を第１焦点５１ａ及び第２焦点５１ｂとする略半楕円断面形状を有する。このため、レンズ５の凸面５４への入射角が最大になる光は、第１焦点５１ａ及び第２焦点５１ｂから凸面５４の中心５４１に入射する光である。このときの入射角を臨界角以下の所定の大きさの角度αに設定することによって、出射面３３を通って凸面５４に入射する任意の光について、その入射角θは角度α以下となり、凸面５４で反射されずに取り出される。上記の角度αの設定は、出射面３３及びレンズ５の径等を定めることによって行われる。   FIG. 3 shows a cross-sectional shape of one lens 5. The light incident on the lens 5 enters from the exit surface 33 of the substrate 3. The lens 5 has a substantially semi-elliptical cross-sectional shape with the first focal point 51 a and the second focal point 51 b being symmetrical points on the periphery of each of the emission surfaces 33. For this reason, the light having the maximum incident angle on the convex surface 54 of the lens 5 is light incident on the center 541 of the convex surface 54 from the first focal point 51a and the second focal point 51b. By setting the incident angle at this time to an angle α having a predetermined size equal to or smaller than the critical angle, the incident angle θ of any light incident on the convex surface 54 through the emission surface 33 becomes equal to or smaller than the angle α. 54 is taken out without being reflected. The angle α is set by determining the diameters of the exit surface 33 and the lens 5 and the like.

図４は、有機ＥＬ層２の構成を示す。有機ＥＬ層２は、陽極２２と陰極２６との間に少なくとも有機発光層２４を有する面発光光源であり、例えば、透明電極から成る陽極２２、ホール輸送層２３、有機発光層２４、電子注入層２５、及び陰極２６の各層が、この順で積層されて成る。各層の材料は、例えば、陽極２２がＩＴＯ（Indium Tin Oxide）、ホール輸送層２３がアリールアミン類、有機発光層２４がアルミ錯体（Ａｌｑ３）、電子注入層２５がアルカリ金属でドーピングした有機層又はリチウム錯体、陰極２６がアルミニウム等の金属である。陽極２２と陰極２６間に通電することによって、有機発光層２４から光が放出される。有機発光層２４から放出された光は、透明な陽極２２を通して取り出される。金属から成る陰極２６は、有機発光層２４からの光を光取り出し側に反射する。有機ＥＬ層２は、さらに他の層を有してもよく、例えば、陽極２２とホール輸送層２３との間に、銅フタロシアニン等から成るホール注入層を設けてもよいし、有機発光層２４と電子注入層２５との間にオキサジアゾール類等から成る電子輸送層を設けてもよい。有機ＥＬ層２のこれら各層は、例えば、真空蒸着法によって基板３の面３１に陽極２２から順に成膜される。 FIG. 4 shows the configuration of the organic EL layer 2. The organic EL layer 2 is a surface emitting light source having at least an organic light emitting layer 24 between an anode 22 and a cathode 26. For example, the anode 22, a hole transport layer 23, an organic light emitting layer 24, an electron injection layer made of a transparent electrode. 25 and the cathode 26 are laminated in this order. The material of each layer is, for example, an organic layer in which the anode 22 is ITO (Indium Tin Oxide), the hole transport layer 23 is an arylamine, the organic light emitting layer 24 is an aluminum complex (Alq 3 ), and the electron injection layer 25 is doped with an alkali metal. Alternatively, the lithium complex and the cathode 26 are a metal such as aluminum. By energizing between the anode 22 and the cathode 26, light is emitted from the organic light emitting layer 24. The light emitted from the organic light emitting layer 24 is extracted through the transparent anode 22. The cathode 26 made of metal reflects light from the organic light emitting layer 24 to the light extraction side. The organic EL layer 2 may further include other layers. For example, a hole injection layer made of copper phthalocyanine or the like may be provided between the anode 22 and the hole transport layer 23, or the organic light emitting layer 24. An electron transport layer made of oxadiazoles or the like may be provided between the electron injection layer 25 and the electron injection layer 25. These layers of the organic EL layer 2 are sequentially formed from the anode 22 on the surface 31 of the substrate 3 by, for example, a vacuum deposition method.

ここで、基板３とレンズ５の屈折率は、陽極２２の屈折率と略同じことが望ましい。陽極２２のＩＴＯの屈折率は約２であり、基板３は、例えば、屈折率が約２の高屈折率のガラスから形成され、レンズ５は、例えば、酸化モリブデン等を添加して屈折率を高めた樹脂から成型される。また、基板３とレンズ５は、屈折率を高めた樹脂等が一体成型されたものであってもよい。これにより、陽極２２と基板３間の界面、及び基板３とレンズ５間の界面での屈折率差がほぼ無くなり、これら界面での光の反射が防止される。   Here, the refractive index of the substrate 3 and the lens 5 is preferably substantially the same as the refractive index of the anode 22. The refractive index of ITO of the anode 22 is about 2, the substrate 3 is made of, for example, a high refractive index glass having a refractive index of about 2, and the lens 5 has a refractive index added by, for example, molybdenum oxide. Molded from raised resin. Further, the substrate 3 and the lens 5 may be formed by integrally molding a resin having a higher refractive index. Thereby, the refractive index difference at the interface between the anode 22 and the substrate 3 and at the interface between the substrate 3 and the lens 5 is almost eliminated, and reflection of light at these interfaces is prevented.

再び図１を参照して、上記のように構成された発光装置１の光路について説明する。有機ＥＬ層２から放出されて基板３に入射した光のうち、Ｖ字状の溝４に囲まれた出射面３３に向かう光Ｌ１は、出射面３３から出射される。基板３に入射した光のうち、Ｖ字状の溝４に向かう光Ｌ２は、反射面４１によって、ほとんどが出射面３３に向けて反射され、出射面３３から出射される。出射面３３から出射された光Ｌ１、Ｌ２は、出射面３３からレンズ５に入射し、略半楕円断面形状の凸面５４で反射されずに取り出される。   With reference to FIG. 1 again, the optical path of the light-emitting device 1 configured as described above will be described. Of the light emitted from the organic EL layer 2 and incident on the substrate 3, the light L <b> 1 toward the emission surface 33 surrounded by the V-shaped groove 4 is emitted from the emission surface 33. Of the light incident on the substrate 3, most of the light L <b> 2 directed toward the V-shaped groove 4 is reflected by the reflecting surface 41 toward the emitting surface 33 and is emitted from the emitting surface 33. Lights L1 and L2 emitted from the emission surface 33 enter the lens 5 from the emission surface 33, and are extracted without being reflected by the convex surface 54 having a substantially semi-elliptical cross section.

このように、基板３の光取り出し面３２から取り出される光は、基板３上に離間して配置された出射面３３を通ってレンズ５に入射するため、レンズ５の凸面５４で反射されずに取り出される。これにより、上記のような出射面３３が設けられていない場合に比べて、光取り出し効率が向上する。また、隣接する出射面３３の間に形成されたＶ字状の溝形成面に反射面４１があることによって、基板３内に入射した光の多くが出射面３３に向けられレンズ５を通して取り出されるので、光取り出し効率が向上する。また、複数の出射面３３が離間配置されるが、レンズ５の凸面５４全体から光が出射され、互いに隣り合うレンズ５が多角形の辺５２で接するように隙間無く形成されるので、発光装置１は、光取り出し側の全面が発光するように配光制御される。なお、本実施形態の発光装置１は、レンズ５を備えるが、レンズ５を備えない場合であっても、面発光光源である有機ＥＬ層２から基板３に入射した光の多くが、基板３上に離間配置された出射面３３から出射されるので、出射面３３が擬似的な点光源となる。この点光源は、面発光光源と比べてレンズ等による配光制御が容易であり、発光装置の光取り出し効率の向上が容易となる。   As described above, the light extracted from the light extraction surface 32 of the substrate 3 enters the lens 5 through the emission surface 33 arranged on the substrate 3 so as to be not reflected by the convex surface 54 of the lens 5. It is taken out. Thereby, compared with the case where the above output surfaces 33 are not provided, the light extraction efficiency is improved. Further, since the reflection surface 41 is provided on the V-shaped groove forming surface formed between the adjacent emission surfaces 33, most of the light incident on the substrate 3 is directed toward the emission surface 33 and extracted through the lens 5. Therefore, the light extraction efficiency is improved. Further, although the plurality of emission surfaces 33 are spaced apart from each other, light is emitted from the entire convex surface 54 of the lens 5, and the adjacent lenses 5 are formed with no gap so that they are in contact with each other at the polygonal side 52. 1 is light distribution controlled so that the entire surface on the light extraction side emits light. In addition, although the light-emitting device 1 of this embodiment is equipped with the lens 5, even if it is a case where the lens 5 is not provided, most of the light which injected into the board | substrate 3 from the organic EL layer 2 which is a surface emitting light source is board | substrate 3. Since it radiates | emits from the output surface 33 spaced apart above, the output surface 33 becomes a pseudo point light source. This point light source is easier to control light distribution by a lens or the like than a surface light source, and the light extraction efficiency of the light emitting device can be easily improved.

（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５を参照して説明する。図５は本実施形態の発光装置１１の構成を示す。本実施形態の発光装置１１は、第１の実施形態と同様の構成に加え、基板３の有機ＥＬ層２が形成されている面３１に、光を拡散透過する光拡散層６を備える。光拡散層６は、例えば、基板の面３１にショットブラスト又はエッチング等によって形成された微差な凹凸である。光拡散層６の上に、有機ＥＬ層２が蒸着等によって形成される。 (Second Embodiment)
A light emitting device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a configuration of the light emitting device 11 of the present embodiment. In addition to the same configuration as that of the first embodiment, the light emitting device 11 of the present embodiment includes a light diffusion layer 6 that diffuses and transmits light on the surface 31 of the substrate 3 on which the organic EL layer 2 is formed. The light diffusion layer 6 is, for example, slight unevenness formed on the surface 31 of the substrate by shot blasting or etching. The organic EL layer 2 is formed on the light diffusion layer 6 by vapor deposition or the like.

本実施形態によれば、有機ＥＬ層２から出射された光は、光拡散層６で拡散透過し、拡散透過によって全反射が軽減されて基板３に入射し、レンズ５を通して取り出されるので、光取り出し効率が向上する。   According to the present embodiment, the light emitted from the organic EL layer 2 is diffused and transmitted by the light diffusion layer 6, is totally reflected by the diffused transmission, enters the substrate 3, and is extracted through the lens 5. Extraction efficiency is improved.

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、光拡散層６は、ＳｉＯ２等の微粒子を分散した透明な樹脂を材料としてスピンコーティング等によって形成した層であってもよい。 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 light diffusion layer 6 may be a layer formed by spin coating or the like using a transparent resin in which fine particles such as SiO 2 are dispersed.

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. 同装置の平面図。The top view of the apparatus. 同装置におけるレンズの断面形状の説明図。Explanatory drawing of the cross-sectional shape of the lens in the apparatus. 同装置における有機ＥＬ層の断面図。Sectional drawing of the organic electroluminescent layer in the apparatus. 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.

符号の説明Explanation of symbols

１、１１ 有機ＥＬ発光装置
２ 有機ＥＬ層
２２ 陽極
２４ 有機発光層
２６ 陰極
３ 基板
３１ 光取り出し面
３３ 出射面
４ Ｖ字状の溝
４１ 反射面
５ レンズ
５１ａ 第１焦点
５１ｂ 第２焦点
５２ 辺
６ 光拡散層 DESCRIPTION OF SYMBOLS 1, 11 Organic EL light-emitting device 2 Organic EL layer 22 Anode 24 Organic light-emitting layer 26 Cathode 3 Substrate 31 Light extraction surface 33 Output surface 4 V-shaped groove 41 Reflection surface 5 Lens 51a First focus 51b Second focus 52 Side 6 Light diffusion layer

Claims (4)

基板と、この基板上に形成された有機ＥＬ層と、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、
前記基板は、前記有機ＥＬ層が形成されている面とは反対側面を光取り出し面とし、この光取り出し面に互いに隣接すると共に離間配置された複数の出射面と、これら隣接する出射面の間に形成されたＶ字状の溝と、この溝形成面に設けられた反射面とを有することを特徴とする有機ＥＬ発光装置。 An organic EL light emitting device comprising a substrate and an organic EL layer formed on the substrate, wherein light from the organic EL layer is extracted through the substrate,
The substrate has a side opposite to the surface on which the organic EL layer is formed as a light extraction surface, and a plurality of emission surfaces adjacent to and spaced from the light extraction surface, and between the adjacent emission surfaces. An organic EL light emitting device comprising: a V-shaped groove formed on the surface; and a reflective surface provided on the groove forming surface. 前記基板の光取り出し面上に前記出射面の各々に対応して形成されたレンズをさらに備え、
前記レンズは、前記出射面の各々の周縁の互いに対称な点を第１焦点及び第２焦点とする略半楕円断面形状を有し、互いに隣合うレンズが平面視多角形の辺で接することを特徴とする請求項１に記載の有機ＥＬ発光装置。 Further comprising a lens formed on the light extraction surface of the substrate corresponding to each of the emission surfaces,
The lens has a substantially semi-elliptical cross-sectional shape in which the first focus and the second focus are symmetrical points on the periphery of each of the emission surfaces, and adjacent lenses are in contact with sides of a polygon in plan view. The organic EL light-emitting device according to claim 1. 前記有機ＥＬ層は、陽極と、陰極と、前記陽極及び前記陰極の間に少なくとも有機発光層とを有し、前記陽極が前記基板上に形成されており、
前記基板と前記レンズの屈折率は、前記陽極の屈折率と略同じであることを特徴とする請求項２に記載の有機ＥＬ発光装置。 The organic EL layer has an anode, a cathode, and at least an organic light emitting layer between the anode and the cathode, and the anode is formed on the substrate,
The organic EL light-emitting device according to claim 2, wherein the refractive index of the substrate and the lens is substantially the same as the refractive index of the anode. 前記基板の有機ＥＬ層が形成されている面に、光を拡散透過する光拡散層が設けられてい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。   The organic EL light-emitting device according to claim 1, wherein a light diffusion layer that diffuses and transmits light is provided on a surface of the substrate on which the organic EL layer is formed.
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