JP2008258059A - Organic electroluminescent element for end face light emission type optical communication, and optical wiring module - Google Patents

Organic electroluminescent element for end face light emission type optical communication, and optical wiring module Download PDF

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JP2008258059A
JP2008258059A JP2007100337A JP2007100337A JP2008258059A JP 2008258059 A JP2008258059 A JP 2008258059A JP 2007100337 A JP2007100337 A JP 2007100337A JP 2007100337 A JP2007100337 A JP 2007100337A JP 2008258059 A JP2008258059 A JP 2008258059A
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Takeshi Fukuda
武司 福田
Morio Taniguchi
彬雄 谷口
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Fujikura Ltd
Shinshu University NUC
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Fujikura Ltd
Shinshu University NUC
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an end face emission type organic EL element for optical communication wherein luminescent efficiency from the end face of an organic EL element, and coupling efficiency with optical wiring can be greatly raised. <P>SOLUTION: In this end emission type organic electroluminescent element for optical communication, a dielectric multilayered film filter is provided on a transparent substrate, a first electrode layer comprising a transparent conductor film is provided on the dielectric multilayered film filter, an organic layer including a luminescent layer is provided on the first electrode layer, and a second electrode layer comprising a metal thin film is provided on the organic layer. The dielectric multilayered film filter reflects light produced in the luminescent layer and transmitted through the organic layer and the first electrode layer to collect it in the first electrode layer, and the first electrode layer has a light emitting end face forming a part of the end face which emits the light. <P>COPYRIGHT: (C)2009,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と記す。）を用いた発光素子に関し、詳しくは光ファイバや光導波路などの光配線との結合効率が高く、発光効率の高い端面発光型光通信用有機ＥＬ素子に関する。   The present invention relates to a light-emitting element using organic electroluminescence (hereinafter, referred to as organic EL), and more specifically, edge-emitting optical communication having high coupling efficiency with optical wiring such as an optical fiber and an optical waveguide and high luminous efficiency. The present invention relates to an organic EL element for use.

有機ＥＬ素子は、透明なガラスもしくは透明な樹脂基板の表面に、第１電極層（陽極）、有機層、第２電極層（陰極）が積層された基本構成を有する。有機ＥＬ素子はコントラスト比が高い、視野角が広い、薄型化が可能であるといった特徴を有しており、ディスプレイなどの分野に応用され始めている。 また、有機ＥＬ素子を利用したディスプレイでは駆動用のトランジスタ回路上に発光部を形成するために通常の素子構造ではトランジスタ部分で発光した光が吸収もしくは散乱されてしまい、外部への取り出し効率が悪化するという問題がある。この問題を解決するためにガラス基板上に陰極、有機層、陽極の順番に積層されたトップエミッション構造と呼ばれる構造も検討されている。   The organic EL element has a basic configuration in which a first electrode layer (anode), an organic layer, and a second electrode layer (cathode) are laminated on the surface of transparent glass or a transparent resin substrate. Organic EL elements have features such as a high contrast ratio, a wide viewing angle, and a reduction in thickness, and are beginning to be applied to fields such as displays. In addition, in a display using an organic EL element, since a light emitting portion is formed on a driving transistor circuit, light emitted from the transistor portion is absorbed or scattered in a normal element structure, and the extraction efficiency to the outside deteriorates. There is a problem of doing. In order to solve this problem, a structure called a top emission structure in which a cathode, an organic layer, and an anode are laminated in this order on a glass substrate has been studied.

第１電極層（陽極）は、ＩＴＯ（スズ添加酸化インジウム）に代表される透明導電材料から形成される。有機層は、正孔注入層、正孔輸送層、発光層、電子輸送層、電子注入層など、複数層から構成される。第２電極層（陰極）はＭｇ：Ａｇ、Ａｌ，Ｃａなどの金属材料で構成される。   The first electrode layer (anode) is formed from a transparent conductive material typified by ITO (tin-added indium oxide). The organic layer is composed of a plurality of layers such as a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. The second electrode layer (cathode) is made of a metal material such as Mg: Ag, Al, or Ca.

有機ＥＬ素子は多くの研究機関で研究開発が進められており、その発光特性（発光効率、最大輝度、消費電力など）は飛躍的に向上してきている。例えば、従来の蛍光材料よりも発光効率の高い燐光材料（特許文献１参照。）、低い仕事関数を有する陰極材料（特許文献２参照。）、電子と正孔のキャリアバランスの最適化（特許文献３参照。）など多くの研究開発が行われている。また、低コスト化が実現可能な製造方法として従来の真空蒸着だけではなくスクリーン印刷やグラビア印刷、インクジェット法などを用いた脱真空プロセスが検討されている。   Organic EL devices are being researched and developed by many research institutions, and their light emission characteristics (emission efficiency, maximum luminance, power consumption, etc.) have been dramatically improved. For example, phosphorescent materials having higher luminous efficiency than conventional fluorescent materials (see Patent Literature 1), cathode materials having a low work function (see Patent Literature 2), and optimization of electron and hole carrier balance (Patent Literature) Many researches and developments are underway. Further, as a manufacturing method capable of realizing cost reduction, not only the conventional vacuum deposition but also a vacuum removal process using screen printing, gravure printing, an ink jet method or the like is being studied.

本発明に関係すると思われる従来技術として、特許文献４〜１４が挙げられる。
特許文献４には、上下電極と発光層の間にクラッド層を設けて光を導波させる構造が記載されている。
特許文献５には、陽極と陰極の間にクラッド層を設けて屈折率の高い領域に光を導波させる構造が記載されている。
特許文献６には、側面の一部に光透過部を設け、それ以外の部分に反射部を設け、光透過部から光を取り出す構造が記載されている。
特許文献７には、陽極と陰極の両方を金属とし、端面から光を出し、該端面にミラーを設けて正面に光を取り出す構造が記載されている。
特許文献８には、端面発光型素子において端面を研磨若しくは平滑な凸面形状にすることで端面への光の取り出し効率を向上させる構造が記載されている。
特許文献９には、陰極と陽極共に反射率の高い金属を用いて端面輝度を向上させた構造が記載されている。
特許文献１０には、基板の表裏にそれぞれ反射能を有する陰極を設けることで端面発光させる構造が記載されている。
特許文献１１には、透明基板の上下に複数の発光素子を形成して合わせる構造が記載されている。
特許文献１２には、ガラスの裏側に反射層を設ける構造が記載されている。
特許文献１３には、陽極と陰極に挟まれた有機化合物に関して記載されている。
特許文献１４には、公知文献に端面発光に関する公報が記載されている。
特開２００１−２５７０７６号公報 特開２０００−２２３２８０号公報 特開２００１−２３７０７９号公報 特開平１−１０９６９４号公報 特開平４−２３７９９３号公報 特開平８−１３８８７０号公報 特開平８−１６７４７７号公報 特開２００１−２４４０６７号公報 特開平９−７７６２号公報 特開平４−２８１９７号公報 特開平４−５１４９１号公報 実開平４−１４３９６号公報 特開平８−３０２３４１号公報 特開平１０−３９９０号公報 Patent documents 4-14 are mentioned as conventional technology considered to be related to the present invention.
Patent Document 4 describes a structure in which a cladding layer is provided between upper and lower electrodes and a light emitting layer to guide light.
Patent Document 5 describes a structure in which a cladding layer is provided between an anode and a cathode to guide light to a region having a high refractive index.
Patent Document 6 describes a structure in which a light transmission part is provided on a part of a side surface, a reflection part is provided on the other part, and light is extracted from the light transmission part.
Patent Document 7 describes a structure in which both an anode and a cathode are made of metal, light is emitted from an end face, a mirror is provided on the end face, and light is taken out from the front face.
Patent Document 8 describes a structure that improves the light extraction efficiency to the end surface by polishing or smoothing the end surface of the end surface light emitting element.
Patent Document 9 describes a structure in which end face luminance is improved by using a metal having high reflectivity for both the cathode and the anode.
Patent Document 10 describes a structure that emits edge light by providing a cathode having reflectivity on the front and back of a substrate.
Patent Document 11 describes a structure in which a plurality of light emitting elements are formed and combined on the top and bottom of a transparent substrate.
Patent Document 12 describes a structure in which a reflective layer is provided on the back side of glass.
Patent Document 13 describes an organic compound sandwiched between an anode and a cathode.
Patent Document 14 describes a gazette related to edge emission in a publicly known document.
Japanese Patent Laid-Open No. 2001-257076 JP 2000-223280 A JP 2001-237079 A Japanese Patent Laid-Open No. 1-109694 JP-A-4-237993 JP-A-8-138870 JP-A-8-167477 JP 2001-244067 A Japanese Patent Laid-Open No. 9-7762 JP-A-4-28197 JP-A-4-51491 Japanese Utility Model Publication No. 4-14396 JP-A-8-302341 Japanese Patent Laid-Open No. 10-3990

通常の有機ＥＬ素子は、ディスプレイとしての応用が多くの研究機関で行われており、最近では、照明やプリンタ用の光源などの分野でも検討が進められている。しかしながら、光通信用の光源としてはほとんど検討されてないのが現状である。
光通信に有機ＥＬ素子を用いる場合には、光配線との結合効率や従来のディスプレイ用途では想定していなかった非常に高い輝度が必要となってくる。光通信用の光源として使用する場合には必ず光ファイバなどの光配線と接続する必要がある。しかし、有機ＥＬ素子と光配線との結合効率については、十分な研究開発が行われていない。また、高輝度化については、ディスプレイ用途については数１００ｃｄ／ｍ２というディスプレイとしては十分な高い輝度を実現できているが、光通信用途ではこの１００〜１０００倍以上の輝度が必要となり、未だに十分な輝度が実現されていないのが現状である。 Ordinary organic EL elements have been applied to many research institutions as displays, and recently, studies have been made in the fields of illumination and light sources for printers. However, at present, the light source for optical communication is hardly studied.
When an organic EL element is used for optical communication, the coupling efficiency with the optical wiring and a very high brightness that is not assumed in conventional display applications are required. When it is used as a light source for optical communication, it must be connected to an optical wiring such as an optical fiber. However, sufficient research and development has not been conducted on the coupling efficiency between the organic EL element and the optical wiring. In addition, with regard to high brightness, for display applications, a sufficiently high brightness has been realized for a display of several hundred cd / m 2 , but for optical communication applications, this brightness is required to be 100 to 1000 times or more, and is still sufficient. The current situation is that a high luminance is not realized.

本発明は、前記事情に鑑みてなされ、有機ＥＬ素子端面からの発光効率が高く、且つ光配線との結合効率を非常に高くすることが可能な端面発光型光通信用有機ＥＬ素子の提供を目的とする。
なお、以下の記載において、端面発光型光通信用有機ＥＬ素子は有機ＥＬ素子と略記する。 The present invention has been made in view of the above circumstances, and provides an organic EL element for edge-emitting optical communication that has high emission efficiency from the end face of the organic EL element and that can have very high coupling efficiency with optical wiring. Objective.
In the following description, the organic EL element for edge-emitting optical communication is abbreviated as an organic EL element.

前記目的を達成するため、本発明は、透明基板上に誘電体多層膜フィルタが設けられ、該誘電体多層膜フィルタ上に透明導電体膜からなる第１電極層が設けられ、該第１電極層上に発光層を含む有機層が設けられ、該有機層上に金属薄膜からなる第２電極層が設けられてなり、前記誘電体多層膜フィルタは、前記発光層で生じて有機層及び第１電極層を透過した光を反射して、第１電極層に光を集め、且つ前記第１電極層は、その光を出射する端面の一部である光出射端面を有することを特徴とする有機ＥＬ素子を提供する。   In order to achieve the above object, according to the present invention, a dielectric multilayer filter is provided on a transparent substrate, a first electrode layer made of a transparent conductor film is provided on the dielectric multilayer filter, and the first electrode An organic layer including a light emitting layer is provided on the layer, and a second electrode layer made of a metal thin film is provided on the organic layer. The dielectric multilayer filter is formed in the light emitting layer, and the organic layer and the first layer are formed. The light transmitted through one electrode layer is reflected to collect the light on the first electrode layer, and the first electrode layer has a light emitting end face that is a part of an end face that emits the light. An organic EL device is provided.

本発明の有機ＥＬ素子において、前記誘電体多層膜フィルタの反射率が有機エレクトロルミネッセンス素子の発光中心波長において６１．５％以上であることが好ましい。   In the organic EL device of the present invention, the dielectric multilayer filter preferably has a reflectance of 61.5% or more at the emission center wavelength of the organic electroluminescence device.

本発明の有機ＥＬ素子において、この素子の光出射端面に、該出射光を受光可能なように光配線が接続されてなることが好ましい。   In the organic EL element of the present invention, it is preferable that an optical wiring is connected to the light emitting end face of the element so as to receive the emitted light.

本発明の有機ＥＬ素子において、前記素子の光出射端面と前記光配線との接続部では、前記第１電極層の幅が前記光配線のコア幅と同程度に設定されていることが好ましい。   In the organic EL element of the present invention, it is preferable that the width of the first electrode layer is set to be approximately the same as the core width of the optical wiring at the connection portion between the light emitting end face of the element and the optical wiring.

本発明の有機ＥＬ素子において、前記第１電極層の幅が、前記光出射端面に向かってテーパー状に変化していることが好ましい。   In the organic EL element of the present invention, it is preferable that the width of the first electrode layer changes in a tapered shape toward the light emitting end face.

また本発明は、前述した本発明に係る有機ＥＬ素子を有することを特徴とする光配線モジュールを提供する。   The present invention also provides an optical wiring module comprising the above-described organic EL element according to the present invention.

本発明の有機ＥＬ素子は、誘電体多層膜フィルタを形成した透明基板上に有機ＥＬ素子を作製し、有機ＥＬ素子内部からの発光を誘電体多層膜フィルタで反射させることで、各層の中で屈折率が最も高い第１電極層に光を閉じこめることが可能になり、有機ＥＬ素子内部から発した光を効率よく第１電極層に導波させ、第１電極層に設けた光出射端面から出射させることにより、有機ＥＬ素子端面からの発光効率を向上させることができる。
また、誘電体多層膜フィルタの反射率を向上させることで、第１電極層に閉じこめられる光の割合を増加させ、発光効率を更に高めることも可能である。
さらに、本発明の素子構造は端面からの発光を利用しており、この発光は屈折率が最も高い第１電極層を導波してくるものが５０％程度であり、これは数１００ｎｍと非常に狭い領域に閉じこめられているために導波光のモードフィールド径は非常に小さくできる。そのため、第１電極層端面に光配線と接続することで、有機ＥＬ素子と光配線との結合効率を非常に高くすることが可能になる。 In the organic EL element of the present invention, an organic EL element is produced on a transparent substrate on which a dielectric multilayer filter is formed, and light emitted from the inside of the organic EL element is reflected by the dielectric multilayer filter. Light can be confined to the first electrode layer having the highest refractive index, and light emitted from the inside of the organic EL element is efficiently guided to the first electrode layer, and from the light emitting end face provided on the first electrode layer. By emitting the light, the light emission efficiency from the end face of the organic EL element can be improved.
Further, by improving the reflectance of the dielectric multilayer filter, it is possible to increase the ratio of light confined in the first electrode layer and further increase the light emission efficiency.
Furthermore, the element structure of the present invention utilizes light emission from the end face, and this light emission is about 50% that is guided through the first electrode layer having the highest refractive index. Therefore, the mode field diameter of the guided light can be made very small. Therefore, the coupling efficiency between the organic EL element and the optical wiring can be extremely increased by connecting the optical wiring to the end face of the first electrode layer.

以下、実施例により本発明を具体的に説明するが、後述する実施例は本発明の単なる例示であり、本発明の範囲を限定するためのものではない。   Hereinafter, the present invention will be specifically described by way of examples. However, the examples described later are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

（実施例１）
図１は、本発明に係る有機ＥＬ素子の実施例１を示す断面図である。この有機ＥＬ素子は、透明基板であるガラス基板１の上に誘電体多層膜フィルタ５を設け、この誘電体多層膜フィルタ５上に、透明導電膜からなる第１電極層としてＩＴＯ膜２、発光層を含む有機層３及び金属薄膜からなる第２電極層４を順に積層してなり、誘電体多層膜フィルタ５は、発光層で生じて有機層３及び第１電極層２を透過した光を反射して、第１電極層２に光を集め、且つ第１電極層２には、その光を出射する端面の一部である光出射端面を有している。 Example 1
FIG. 1 is a sectional view showing Example 1 of an organic EL element according to the present invention. In this organic EL element, a dielectric multilayer filter 5 is provided on a glass substrate 1 which is a transparent substrate, and an ITO film 2 as a first electrode layer made of a transparent conductive film is formed on the dielectric multilayer filter 5. An organic layer 3 including a layer and a second electrode layer 4 made of a metal thin film are laminated in order, and the dielectric multilayer filter 5 transmits light generated in the light emitting layer and transmitted through the organic layer 3 and the first electrode layer 2. The first electrode layer 2 has a light emission end face that is part of the end face that reflects and collects light in the first electrode layer 2 and emits the light.

この有機ＥＬ素子は、次のように作製した。
まずガラス基板１上に、ＳｉＯ２とＴａ２Ｏ５を交互に積層した誘電体多層膜フィルタ５を成膜した。ここでＳｉＯ２とＴａ２Ｏ５の光学的な膜厚は有機ＥＬ素子の発光スペクトルの中心波長の１／４として、それぞれ８６．３２ｎｍと５６．８５ｎｍとした。ここで、ＳｉＯ２とＴａ２Ｏ５の組数を増やすことで、誘電体多層膜フィルタ５の反射率を増加させることができる。 This organic EL element was produced as follows.
First, a dielectric multilayer filter 5 in which SiO 2 and Ta 2 O 5 were alternately laminated was formed on a glass substrate 1. Here, the optical film thicknesses of SiO 2 and Ta 2 O 5 were set to 86.32 nm and 56.85 nm, respectively, as ¼ of the center wavelength of the emission spectrum of the organic EL element. Here, the reflectance of the dielectric multilayer filter 5 can be increased by increasing the number of pairs of SiO 2 and Ta 2 O 5 .

この誘電体多層膜フィルタ５上にＩＴＯ（１００ｎｍ）／α−ＮＰＤ（２８ｎｍ）／ドープ量０．５質量％のｃｏｕｍａｒｉｎ６：Ａｌｑ３（２０ｎｍ）／Ａｌｑ３（２２ｎｍ）／ＬｉＦ（０．４ｎｍ）／ＭｇＡｇ（１５０ｎｍ）の順番に成膜することで、有機ＥＬ素子を作製した。前記α−ＮＰＤは、４，４’−ビス［Ｎ−（１−ナフチル）−Ｎ−フェニル−アミノ］−ビフェニルを表し、Ａｌｑ３は、トリス（８−ヒドロキシキノリン）アルミニウムを表す。ここで、誘電体多層膜フィルタ５と陰極（ＭｇＡｇ）とで構成される共振器長は、有機ＥＬ素子の発光スペクトルの中心波長と次の式（１）〜（３）で関係付けられている。 On this dielectric multilayer filter 5, ITO (100 nm) / α-NPD (28 nm) / coumarin 6: Alq 3 (20 nm) / Alq 3 (22 nm) / LiF (0.4 nm) /0.5% by weight of doping The organic EL element was produced by forming the film in the order of MgAg (150 nm). The α-NPD represents 4,4′-bis [N- (1-naphthyl) -N-phenyl-amino] -biphenyl, and Alq 3 represents tris (8-hydroxyquinoline) aluminum. Here, the resonator length composed of the dielectric multilayer filter 5 and the cathode (MgAg) is related to the center wavelength of the emission spectrum of the organic EL element by the following equations (1) to (3). .

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Figure 2008258059
Figure 2008258059

式（１）〜（３）中、Ｌ（λ）は共振器長、ｎｅｆｆは誘電体多層膜フィルタの等価屈折率、ΔｎはＳｉＯ２とＴａ２Ｏ５との屈折率差、ｎｊとＬｊは共振器中に存在するＩＴＯや有機層のそれぞれの屈折率と厚さ、λは有機ＥＬ素子の発光スペクトルの中心波長、ｎｓは陰極に接している有機層の屈折率、ｎｍとｋｍは陰極の屈折率の実部と虚部、ｍはモード次数を示している。 In equations (1) to (3), L (λ) is the resonator length, n eff is the equivalent refractive index of the dielectric multilayer filter, Δn is the difference in refractive index between SiO 2 and Ta 2 O 5, and n j L j is the refractive index and thickness of each ITO or organic layer present in the resonator, λ is the center wavelength of the emission spectrum of the organic EL element, n s is the refractive index of the organic layer in contact with the cathode, nm k m is the real and imaginary parts of the refractive index of the cathode, m denotes a mode order and.

実施例１の素子構造では、発光スペクトルの中心波長が５１０ｎｍであり、使用した有機層やＩＴＯ、ＭｇＡｇなどの膜厚や屈折率を代入して計算することでモード次数ｍ＝４が得られた。   In the element structure of Example 1, the center wavelength of the emission spectrum was 510 nm, and the mode order m = 4 was obtained by substituting and calculating the film thickness and refractive index of the used organic layer, ITO, MgAg, or the like. .

誘電体多層膜フィルタを形成しているＳｉＯ２とＴａ２Ｏ５の組数を１から６の範囲で変化させて有機ＥＬ素子を作製した。次に、作製した有機ＥＬ素子の正面（基板に垂直な方向）と端面（基板に平行な方向）の光出力をフォトディテクタで測定した。測定した正面と端面の光出力の比を計算することで、効率よく端面に光が導波されている条件を評価した。ここで、誘電体多層膜フィルタの組数が０の場合を基準として正面と端面の輝度比を１．００とした。このサンプルと比較して正面輝度の割合が高い場合には正面／端面の輝度比は０〜１の値になり、端面輝度の割合が高い場合には正面／端面の輝度比は１以上の値になる。結果を表１に記す。 Organic EL elements were fabricated by changing the number of SiO 2 and Ta 2 O 5 pairs forming the dielectric multilayer filter in the range of 1 to 6. Next, the light output of the front surface (direction perpendicular to the substrate) and the end surface (direction parallel to the substrate) of the produced organic EL element was measured with a photodetector. The conditions under which light was efficiently guided to the end face were evaluated by calculating the ratio of the measured front and end light outputs. Here, the luminance ratio between the front surface and the end surface was set to 1.00 with reference to the case where the number of sets of dielectric multilayer filters is zero. When the front luminance ratio is higher than that of this sample, the front / end luminance ratio is 0 to 1, and when the end luminance ratio is high, the front / end luminance ratio is 1 or more. become. The results are shown in Table 1.

Figure 2008258059
Figure 2008258059

表１の結果から、誘電体多層膜フィルタの反射率が６１．５％以上の条件で、誘電体多層膜フィルタを用いない場合よりも端面輝度の割合が増加している。また、誘電体多層膜フィルタの反射率が高いほど、その傾向は強い。つまり、反射率が６１．５％以上の誘電体多層膜フィルタ上に有機ＥＬ素子を作製することで、有機ＥＬ素子の端面に光配線を接続した場合に、有機ＥＬ素子内部で発光した光のなかで光配線と結合する光の割合が増加することが分かる。   From the results of Table 1, the ratio of the end face luminance is increased under the condition that the reflectivity of the dielectric multilayer filter is 61.5% or more than in the case where the dielectric multilayer filter is not used. Moreover, the tendency is so strong that the reflectance of a dielectric multilayer filter is high. That is, by producing an organic EL element on a dielectric multilayer filter having a reflectivity of 61.5% or more, when an optical wiring is connected to the end face of the organic EL element, the light emitted inside the organic EL element is reduced. It can be seen that the proportion of light coupled to the optical wiring increases.

（実施例２）
図２は、本発明に係る有機ＥＬ素子の実施例２を示す断面図である。この有機ＥＬ素子は、前記実施例１の有機ＥＬ素子と同じく、ガラス基板１の上に誘電体多層膜フィルタ５を設け、この誘電体多層膜フィルタ５上に、ＩＴＯ膜２、発光層を含む有機層３及び金属薄膜からなる第２電極層４を順に積層した構造になっており、さらに、この有機ＥＬ素子の端面には、光ファイバ等の光配線６が光出射端面からの出射光を受光可能に設けられている。 (Example 2)
FIG. 2 is a sectional view showing Example 2 of the organic EL element according to the present invention. This organic EL element is provided with a dielectric multilayer filter 5 on a glass substrate 1 as in the organic EL element of Example 1, and includes an ITO film 2 and a light emitting layer on the dielectric multilayer filter 5. It has a structure in which an organic layer 3 and a second electrode layer 4 made of a metal thin film are laminated in order. Further, an optical wiring 6 such as an optical fiber transmits light emitted from the light emitting end face to the end face of the organic EL element. It is provided so that it can receive light.

ガラス基板１上には、誘電体多層膜フィルタが設けられ、この誘電体多層膜フィルタ上に設けられたＩＴＯ膜からなる第１電極層２は、一部が突起状に延出してガラス基板１周縁に達する凸字状に形成されている。この突起部分の先端面は、光出射端面になっている。光配線６は、その端面を前記光出射端面に密接した状態で接続されている。前記光出射端面の幅は、光配線６のコア径と略等しい寸法に形成されている。   A dielectric multilayer filter is provided on the glass substrate 1, and a part of the first electrode layer 2 made of an ITO film provided on the dielectric multilayer filter is extended in a protruding shape to form the glass substrate 1. It is formed in a convex shape that reaches the periphery. The tip end surface of the protruding portion is a light emitting end surface. The optical wiring 6 is connected in a state where its end face is in close contact with the light emitting end face. The width of the light emitting end face is formed to be approximately equal to the core diameter of the optical wiring 6.

有機層３及び第２電極層４からなる発光部７は、第１電極層２の一部に積層形成されている。この発光部７内で生じた光は、第１電極層２を透過し、この下の誘電体多層膜フィルタに当たり第１電極層２側に反射される。第１電極層２に集められた光は、突起部分を通して光出射端面から出射される。   The light emitting unit 7 composed of the organic layer 3 and the second electrode layer 4 is laminated on a part of the first electrode layer 2. The light generated in the light emitting section 7 passes through the first electrode layer 2, hits the dielectric multilayer filter below, and is reflected to the first electrode layer 2 side. The light collected on the first electrode layer 2 is emitted from the light emitting end face through the protruding portion.

実施例２に示した構造の有機ＥＬ素子において、ＩＴＯからなる第１電極層を２５０μｍの幅で先端を突起状にした。この先端が突起状になったＩＴＯの側面にコア幅２５０μｍからなるプラスチック光ファイバを配置して、プラスチック光ファイバの出射側での輝度を測定した。ここで、発光部７の形状は１ｍｍ×１ｍｍとした。また、比較のためにＩＴＯ先端を突起状にしていない素子も作製して同様にプラスチック光ファイバ端面の輝度を比較した。その結果、先端を突起状にした素子では１．５倍の輝度の向上が確認できた。   In the organic EL element having the structure shown in Example 2, the first electrode layer made of ITO had a width of 250 μm and a tip formed in a protruding shape. A plastic optical fiber having a core width of 250 μm was arranged on the side surface of the ITO having a protruding tip, and the luminance on the emission side of the plastic optical fiber was measured. Here, the shape of the light emitting portion 7 was 1 mm × 1 mm. For comparison, an element having an ITO tip not formed in a protruding shape was also produced, and the luminance of the end face of the plastic optical fiber was similarly compared. As a result, it was confirmed that the brightness of the element having a protruding tip was improved by 1.5 times.

（実施例３）
図３は、本発明に係る有機ＥＬ素子の実施例３を示す断面図である。この有機ＥＬ素子は、前記実施例２の有機ＥＬ素子とほぼ同じ構成を備えており、第１電極層２の一部に、ガラス基板１周縁に向けてテーパー状に窄まったテーパー部８が設けられていることを特徴としている。このテーパー部８の先端面が光出射端面になっている。 (Example 3)
FIG. 3 is a sectional view showing Example 3 of the organic EL element according to the present invention. This organic EL element has substantially the same configuration as the organic EL element of Example 2, and a tapered portion 8 that is tapered toward the periphery of the glass substrate 1 is formed in a part of the first electrode layer 2. It is characterized by being provided. The tip surface of the tapered portion 8 is a light emitting end surface.

発光部７上の第１電極層の幅１ｍｍから急激に２５０μｍの幅に変化させた素子（実施例２）と発光部７上の第１電極層の幅１ｍｍから１度の角度をつけてなだらかに幅を変化させて最終的に２５０μｍの幅に変化させた素子（実施例３）を作製した。この２つの素子において先端が突起状になったＩＴＯの側面にコア幅２５０μｍからなるプラスチック光ファイバを配置して、プラスチック光ファイバの出射側での輝度を測定した。その結果、テーパーをつけた素子ではテーパーを用いていない素子に比較して７．６倍の輝度の向上が確認できた。   The element (Example 2) in which the width of the first electrode layer on the light-emitting portion 7 was suddenly changed from 1 mm to 250 μm and the first electrode layer on the light-emitting portion 7 was gently inclined at an angle of 1 degree from 1 mm. A device (Example 3) in which the width was finally changed to 250 μm was prepared. In these two elements, a plastic optical fiber having a core width of 250 μm was arranged on the side surface of the ITO having a protruding tip, and the luminance on the emission side of the plastic optical fiber was measured. As a result, it was confirmed that the element with the taper was 7.6 times as bright as the element without the taper.

本発明に係る実施例１の有機ＥＬ素子の断面図である。It is sectional drawing of the organic EL element of Example 1 which concerns on this invention. 本発明に係る実施例２の有機ＥＬ素子の斜視図である。It is a perspective view of the organic EL element of Example 2 which concerns on this invention. 本発明に係る実施例３の有機ＥＬ素子の斜視図である。It is a perspective view of the organic EL element of Example 3 which concerns on this invention.

符号の説明Explanation of symbols

１…ガラス基板（透明基板）、２…第１電極層、３…有機層、４…第２電極層、５…誘電体多層膜フィルタ、６…光配線、７…発光部、８…テーパー部。   DESCRIPTION OF SYMBOLS 1 ... Glass substrate (transparent substrate), 2 ... 1st electrode layer, 3 ... Organic layer, 4 ... 2nd electrode layer, 5 ... Dielectric multilayer filter, 6 ... Optical wiring, 7 ... Light emission part, 8 ... Tapered part .

Claims (6)

透明基板上に誘電体多層膜フィルタが設けられ、該誘電体多層膜フィルタ上に透明導電体膜からなる第１電極層が設けられ、該第１電極層上に発光層を含む有機層が設けられ、該有機層上に金属薄膜からなる第２電極層が設けられてなり、前記誘電体多層膜フィルタは、前記発光層で生じて有機層及び第１電極層を透過した光を反射して、第１電極層に光を集め、且つ前記第１電極層は、その光を出射する端面の一部である光出射端面を有することを特徴とする端面発光型光通信用有機エレクトロルミネッセンス素子。   A dielectric multilayer filter is provided on the transparent substrate, a first electrode layer made of a transparent conductor film is provided on the dielectric multilayer filter, and an organic layer including a light emitting layer is provided on the first electrode layer. A second electrode layer made of a metal thin film is provided on the organic layer, and the dielectric multilayer filter reflects light generated in the light emitting layer and transmitted through the organic layer and the first electrode layer. An organic EL device for edge-emitting optical communication characterized in that it collects light on the first electrode layer, and the first electrode layer has a light emitting end face that is a part of an end face that emits the light. 前記誘電体多層膜フィルタの反射率が有機エレクトロルミネッセンス素子の発光中心波長において６１．５％以上であることを特徴とする請求項１に記載の端面発光型光通信用有機エレクトロルミネッセンス素子。   The organic electroluminescence device for edge-emitting optical communication according to claim 1, wherein the reflectance of the dielectric multilayer filter is 61.5% or more at the emission center wavelength of the organic electroluminescence device. この端面発光型光通信用有機エレクトロルミネッセンス素子の光出射端面に、該出射光を受光可能なように光配線が接続されてなることを特徴とする請求項１又は２に記載の端面発光型光通信用有機エレクトロルミネッセンス素子。   3. The edge-emitting light according to claim 1, wherein an optical wiring is connected to the light emitting end face of the organic light-emitting element for edge-emitting optical communication so that the emitted light can be received. Organic electroluminescence device for communication. 前記素子の光出射端面と前記光配線との接続部において、前記第１電極層の幅が前記光配線のコア幅と同程度に設定されていることを特徴とする請求項３に記載の端面発光型光通信用有機エレクトロルミネッセンス素子。   4. The end face according to claim 3, wherein a width of the first electrode layer is set to be approximately equal to a core width of the optical wiring at a connection portion between the light emitting end face of the element and the optical wiring. Light emitting type organic electroluminescence element for optical communication. 前記第１電極層の幅が、前記光出射端面に向かってテーパー状に変化していることを特徴とする請求項４に記載の端面発光型光通信用有機エレクトロルミネッセンス素子。   5. The organic EL device for edge-emitting optical communication according to claim 4, wherein the width of the first electrode layer changes in a tapered shape toward the light emitting end surface. 請求項１〜５のいずれかに記載の端面発光型光通信用有機エレクトロルミネッセンス素子を有することを特徴とする光配線モジュール。   An optical wiring module comprising the edge-emitting organic electroluminescent element for optical communication according to claim 1.
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JP2003317518A (en) * 2002-04-24 2003-11-07 Keyence Corp Lighting device

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JPH09289354A (en) * 1996-04-19 1997-11-04 Matsushita Electric Ind Co Ltd Semiconductor laser element and optically coupled device
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* Cited by examiner, † Cited by third party
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JPWO2011099525A1 (en) * 2010-02-12 2013-06-13 国立大学法人京都工芸繊維大学 Light emitting transistor
JP5678338B2 (en) * 2010-02-12 2015-03-04 国立大学法人京都工芸繊維大学 Light emitting transistor

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