JPH07220871A - Organic electroluminescence device - Google Patents

Organic electroluminescence device

Info

Publication number
JPH07220871A
JPH07220871A JP6008785A JP878594A JPH07220871A JP H07220871 A JPH07220871 A JP H07220871A JP 6008785 A JP6008785 A JP 6008785A JP 878594 A JP878594 A JP 878594A JP H07220871 A JPH07220871 A JP H07220871A
Authority
JP
Japan
Prior art keywords
emitting layer
layer
light
transporting
electron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6008785A
Other languages
Japanese (ja)
Inventor
Junji Kido
淳二 城戸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Science and Technology Agency
Original Assignee
Research Development Corp of Japan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Research Development Corp of Japan filed Critical Research Development Corp of Japan
Priority to JP6008785A priority Critical patent/JPH07220871A/en
Publication of JPH07220871A publication Critical patent/JPH07220871A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • 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
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light

Abstract

PURPOSE:To operate a full-color display by a simple method by forming a luminescence layer combinationally dispersing at least one or several kinds of pigments in the luminescence layer and covering the visible light region widely to the utmost. CONSTITUTION:This device is constituted of a hole transportation layer 7, an electron transporting white luminescence layer 6, and a metal electrode 1 on an ITO transparent electrode 3. When plus DC voltage is applied to the ITO transparent electrode 3 and minus DC voltage is applied to the metal electrode 1, white luminescence is obtained. The hold transportation layer 7 is made of polyvinyl carbazole and has a high hole transportation property and no electron transportation property. The luminescence layer 6 contains small quantities of fluorescence dyes of an electron transporting oxadiazole derivative, tetraphenyl butadiene serving as the luminescence center, coumarin 6, DCM 1, and nile red in polymethyl methacrylate. These fluorescence dyes illuminate in blue, green, yellow, and red respectively, and white is obtained when they concurrently illuminate.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、低電圧で駆動して可視
光領域をカバ−する高輝度の白色発光層を有するエレク
トロルミネッセンス（以下、単にＥＬという）に基づい
て発光する薄膜型有機ＥＬデバイス、及びこれとカラ−
フィルタ−を組合せて任意の色の発光に関し、薄膜型有
機ＥＬデバイスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film type organic EL device which emits light based on electroluminescence (hereinafter simply referred to as EL) having a white light emitting layer of high brightness which is driven at a low voltage to cover a visible light region. Device, and this and color
The present invention relates to thin-film organic EL devices in combination with filters for emission of any color.

【０００２】[0002]

【従来の技術】最近、有機ＥＬデバイスはワ−ドプロッ
セサやパ−ソナルコンビュ−タ−のデスプレイに応用で
き、そのため低電圧で駆動して高輝度の発光を生じる高
性能の有機ＥＬデバイスを得ようと種々の研究が行われ
ている。有機ＥＬデバイスの典型的な構造を図１に示
す。図１において、インジウム−スズ酸化物（ＩＴＯ）
などの透明電極がコ−トされたガラスのような透明基板
上に有機材料からなる薄膜層を積層し、その上からマグ
ネシウムなどの金属電極を積層したものである。有機材
料は高分子材料や低分子材料、金属錯体が使用される
が、材料により溶液からの塗布や真空蒸着などにより形
成される。有機ＥＬデバイスにおける有機層は単一の層
よりなる単層型や複数の異なる材料を積層した積層型に
分けられており、有機層から発せられる光は透明電極、
ガラス基板を通して取り出すことができる。2. Description of the Related Art Recently, an organic EL device can be applied to a display of a word processor or a personal computer, and therefore, it is attempted to obtain a high-performance organic EL device which is driven at a low voltage and emits light with high brightness. Various studies have been conducted. A typical structure of an organic EL device is shown in FIG. In FIG. 1, indium-tin oxide (ITO)
A thin film layer made of an organic material is laminated on a transparent substrate such as glass on which a transparent electrode such as is coated, and a metal electrode such as magnesium is laminated thereon. A high molecular weight material, a low molecular weight material, or a metal complex is used as the organic material, and the organic material is formed by coating from a solution or vacuum deposition. The organic layer in the organic EL device is divided into a single layer type composed of a single layer and a laminated type in which a plurality of different materials are laminated, and the light emitted from the organic layer is a transparent electrode,
It can be taken out through a glass substrate.

【０００３】有機ＥＬデバイスの一例として、図８に示
すような構造をしているものがある。即ち、例えばイン
ジウム−スズ酸化物（ＩＴＯ）等の透明電極がコ−トさ
れた透明基板上にホ−ル輸送層と電子輸送性発光層とを
積層した有機材料からなる薄膜層を積層し、その上から
マグネシウムなどの金属電極を積層したものであって、
これに電圧を印加すると、ＩＴＯよりホ−ル注入が、ま
た、マグネシウム等の金属電極より電子注入が行われ、
ホ−ル輸送層を運ばれてきたホ−ルが電子輸送性の発光
層に再度注入され、一方、発光層では電子輸送性を兼ね
ているので、電子注入電極から注入された電子は発光層
中を移動し、ホ−ル輸送層中には注入されない。そし
て、発光層中に注入されたホ−ルは電子輸送性の発光層
を殆ど移動しないので電子とホ−ルは発光層側の有機層
界面近傍で両者結合して発光する。そして、この有機層
から発せられた光は透明電極及び透明基板を通して外部
に採りだされるのである。この際の発光の色は発光層の
発光色によって決まり、モノカラ−である。An example of an organic EL device has a structure as shown in FIG. That is, for example, a thin film layer made of an organic material in which a hole transport layer and an electron transport light emitting layer are stacked is laminated on a transparent substrate on which a transparent electrode such as indium-tin oxide (ITO) is coated, A metal electrode such as magnesium is laminated on top of it,
When a voltage is applied to this, hole injection is performed from ITO, and electron injection is performed from a metal electrode such as magnesium,
The holes carried in the hole transporting layer are re-injected into the electron-transporting light-emitting layer, while the light-emitting layer also has the electron-transporting property, so that the electrons injected from the electron-injecting electrode are emitted into the light-emitting layer. It migrates through and is not injected into the hole transport layer. The holes injected into the light-emitting layer hardly move in the electron-transporting light-emitting layer, so that the electrons and the holes are bound to each other in the vicinity of the organic layer interface on the light-emitting layer side to emit light. Then, the light emitted from this organic layer is taken out to the outside through the transparent electrode and the transparent substrate. The color of the light emitted at this time is monochromatic because it is determined by the color of the light emitted from the light emitting layer.

【０００４】従って、外部にフルカラ−ディスプレイと
して採りだすには、赤、緑、青色発光の三種の微細な素
子（ピクセル）を組合せて一つの画素とする必要があ
る。しかし、通常、有機ＥＬデバイスの製造方法として
は、真空蒸着や溶液からの塗布手段によって行われてい
るが、真空蒸着法や塗布手段によって発光色の異なる素
子を微細に配置することは極めて困難であった。Therefore, in order to take out as a full color display to the outside, it is necessary to combine three kinds of fine elements (pixels) of red, green and blue light emission into one pixel. However, as a method for manufacturing an organic EL device, usually, a vacuum vapor deposition method or a coating method from a solution is performed, but it is extremely difficult to finely arrange elements having different emission colors by the vacuum vapor deposition method or the coating means. there were.

【０００５】[0005]

【発明が解決しようとする課題】そこで、本発明者は簡
単な方法によってフルカラ−ディスプレイを得んと種々
検討した結果、発光層中に少なくとも一種もしくは数種
の色素を組合せて分散させて可視光領域をなるべく広く
カバ−する発光層を形成し、これよりカラ−フィルタ−
にて任意の発光色を採りだし得ることを見出し、本発明
を完成したもので、本発明の目的は簡単な方法によって
フルカラ−ディスプレイを作動できるような有機ＥＬデ
バイスを提供することである。Therefore, as a result of various investigations by the present inventor to obtain a full color display by a simple method, as a result of combining at least one or several kinds of dyes in the light emitting layer and dispersing them, visible light A light emitting layer is formed to cover the area as wide as possible, and a color filter is formed from this.
The present invention has been completed by discovering that any luminescent color can be taken out, and an object of the present invention is to provide an organic EL device capable of operating a full color display by a simple method.

【０００６】[0006]

【課題を解決するための手段】本願の第１の発明の要旨
は少なくともホ−ル輸送層と電子輸送性発光層とを備え
た有機エレクトロルミネッセンスデバイスであって、該
発光層に少なくとも一種の色素を高分子中に分散させて
白色発光層を構成していることを特徴とする有機エレク
トロルミネッセンスデバイスであり、第２発明の要旨は
上記の有機ＥＬデバイスにおいて、電子輸送性の発光層
の発光スペクトルが可視光領域を広くカバ−するように
複数種の色素が電子輸送性発光層に分子分散されて存在
していることを特徴とするものである。そして、第３の
発明の要旨は、第１の発明において、電子輸送性発光層
がそれ自体キャリア輸送性を有する高分子中に色素を分
子分散して構成されるか、又は、キャリア輸送性を有し
ない高分子に低分子キャリア輸送材と色素を分子分散し
ていることを特徴とする有機ＥＬデバイスであり、第４
の発明の要旨は白色発光層を有する有機ＥＬデバイスと
カラ−フィルタ−とを組合せて発光色を変調させたこと
を特徴とする有機ＥＬデバイス、また、第５の発明の要
旨は白色発光層を有する有機ＥＬデバイスと二種以上の
異なるカラ−フィルタ−の組合せにより二種以上の異な
る発光色を有するデバイスを同一基板上に配置した有機
ＥＬデバイスである。The first aspect of the present invention is an organic electroluminescence device comprising at least a hole transport layer and an electron transporting light emitting layer, wherein the light emitting layer contains at least one dye. Is dispersed in a polymer to form a white light emitting layer, and the gist of the second invention is the emission spectrum of the electron transporting light emitting layer in the above organic EL device. Is characterized in that a plurality of kinds of dyes are molecularly dispersed in the electron-transporting light-emitting layer so as to cover a wide visible light region. The gist of a third invention is that, in the first invention, the electron-transporting light-emitting layer is formed by molecularly dispersing a dye in a polymer having a carrier-transporting property itself, or has a carrier-transporting property. An organic EL device characterized in that a low-molecular carrier transport material and a dye are molecularly dispersed in a polymer not having the fourth component.
The gist of the invention is an organic EL device characterized in that an emission color is modulated by combining an organic EL device having a white light emitting layer and a color filter, and the gist of the fifth invention is that a white light emitting layer is provided. It is an organic EL device in which devices having two or more different emission colors are arranged on the same substrate by a combination of the organic EL device having the above and two or more different color filters.

【０００７】即ち、本発明においては、発光層中に可視
光領域をなるべく広くカバ−して白色光を発するよう
に、少なくとも一種もしくは数種の色素を高分子中に分
散させて発光層を形成し、該発光層を白色発光層とし、
これをカラ−フィルタ−と組合せて任意の発光色を取り
出すようにし、発光層の微細な配置を必要とすることな
く、組み合わせたカラ−フィルタ−を微細配置すること
により、赤、緑、青の発光ピクセルを微細配置すること
ができる。That is, in the present invention, at least one kind or several kinds of dyes are dispersed in a polymer to form a light emitting layer so as to cover the visible light region as wide as possible and emit white light. The light emitting layer as a white light emitting layer,
This is combined with a color filter to extract any luminescent color, and by arranging the combined color filters in a fine manner without requiring a fine arrangement of the light emitting layer, red, green, and blue can be obtained. The light emitting pixels can be finely arranged.

【０００８】本発明におけるカラ−フィルタ−の配置
は、ガラス基板表面に配置したり、あるいはＩＴＯなど
の透明電極とガラス基板の間に挿入したり、いずれの方
法でも良く、発光色の変調は異なったカラ−フィルタ−
を用いることにより容易に行うことができる。これを図
示すると図３のようになる。図３は、カラ−フィルタ−
と有機ＥＬデバイスとを組み合わせた断面図であり、図
３において、（ａ）はカラ−フィルタ−をガラス基板表
面に配置した場合であり、（ｂ）は透明電極とガラス基
板の間に挿入した場合である。いずれの場合も発光層か
ら出た白色光はカラ−フィルタ−を通過することによっ
て、色の変調が可能となる。したがって、発光色の変調
は異なったカラ−フィルタ−を用いることによって容易
に行うことができる。このようにして、白色の発光層の
みを使用するこの方法は、三色の発光素子の微細配置と
は異なり、カラ−フィルタ−を微細に配置することによ
り可能となる。The color filter in the present invention may be arranged on the surface of the glass substrate, or may be inserted between a transparent electrode such as ITO and the glass substrate, and any method may be used, and the modulation of the emission color is different. Color filter
Can be easily performed by using. This is shown in FIG. FIG. 3 shows a color filter
3A and 3B are cross-sectional views of a combination of an organic EL device and an organic EL device. In FIG. 3, (a) is a case where a color filter is arranged on the glass substrate surface, and (b) is inserted between a transparent electrode and the glass substrate. This is the case. In either case, the white light emitted from the light emitting layer can be modulated in color by passing through the color filter. Therefore, the emission color can be easily modulated by using different color filters. In this way, this method using only the white light emitting layer can be realized by finely disposing the color filter, unlike the fine disposition of the three color light emitting elements.

【０００９】しかして、本発明で使用するカラ−フィル
タ−の概略図を図４に示す。図４において、（ａ）はそ
の平面図であり、（ｂ）はその断面図である。図４に示
されているように、赤、緑、青の三原色を組合せたカラ
−フィルタ−は、プリント法などにより簡単な方法によ
って作製することができる。そして、カラ−フィルタ−
上に透明電極を配置し、その上から有機層を全体に形成
すると、発光色の異なる有機層の微細配置は必要ではな
い。この状態を図５に示す。このようにして形成した有
機層は白色光を発光する層となり、これに直交するよう
に電極を形成すると（図６参照）、金属電極とＩＴＯ電
極の交点が発光可能となり、単純マトリックス駆動のフ
ルカラ−ディスプレイとなる。図７はガラス基板側から
見たときの三色同時発光させたときの様子を示してあ
る。A schematic diagram of the color filter used in the present invention is shown in FIG. In FIG. 4, (a) is a plan view thereof and (b) is a sectional view thereof. As shown in FIG. 4, the color filter in which the three primary colors of red, green and blue are combined can be manufactured by a simple method such as a printing method. And a color filter
When the transparent electrode is arranged on the organic layer and the organic layer is formed over the transparent electrode, it is not necessary to finely arrange the organic layers having different emission colors. This state is shown in FIG. The organic layer formed in this way becomes a layer that emits white light, and if electrodes are formed so as to be orthogonal to this (see FIG. 6), the intersections of the metal electrode and the ITO electrode can emit light, and a simple matrix drive full color -Becomes a display. FIG. 7 shows a state where three colors are simultaneously emitted when viewed from the glass substrate side.

【００１０】次に本発明について詳細に述べる。本発明
で使用する電極としては陽極にはＩＴＯのような透明電
極、陰極にはリチウムやマグネシウムのような仕事関数
の小さい金属、あるいはその合金が用いられる。この電
極間に直流もしくは交流の電圧を印加すれば良く、通常
２ボルト〜３０ボルトの程度の範囲の電圧を印加する。
本発明で使用する色素としては、特に限定するものでは
なく、例えば、クマリン誘導体、ＤＬＭ類などの有機色
素および金属錯体等が用いられる。この色素は、キャリ
ア輸送性の高分子中に分子分散させるか、或いは、低分
子キャリア輸送剤と色素をキャリア輸送性のない高分子
中に分子分散させる。このキャリア輸送性の高分子とは
電子輸送性基、言いかえれば電子受容性基を側鎖あるい
は主鎖中に有する高分子を言い、キャリア輸送性のない
高分子とはポリメチルメタクリレ−トやポリスチレンの
ような電気的に不活性な高分子を言う。そして、キャリ
ア輸送性の無いときに使用する低分子キャリア輸送剤と
は電子輸送性（電子受容性）の低分子材料を言うのであ
って、具体的にはオキサジアゾ−ル誘導体、トリアゾ−
ル誘導体、トリアジン誘導体等をいう。本発明において
は、高輝度と安定性を得るためホ−ル輸送層と電子輸送
性発光層とよりなる。このホ−ル輸送層としてはポリビ
ニルカルバゾ−ルやポリフェニレンビニレン誘導体など
のホ−ル輸送性高分子、また金属フタロシアニンなどの
低分子化合物であり、電子輸送性発光層としては高分子
中に低分子化合物を分子分散したものである。これらの
層は溶液からの塗布や真空蒸着等の手段によって積層す
ることによって得られる。Next, the present invention will be described in detail. As the electrode used in the present invention, a transparent electrode such as ITO is used for the anode, and a metal having a low work function such as lithium or magnesium or an alloy thereof is used for the cathode. A DC or AC voltage may be applied between the electrodes, and a voltage in the range of 2 V to 30 V is usually applied.
The dye used in the present invention is not particularly limited, and for example, coumarin derivatives, organic dyes such as DLMs, and metal complexes are used. This dye is molecularly dispersed in a polymer having a carrier transporting property, or a low molecular carrier transporting agent and a dye are molecularly dispersed in a polymer having no carrier transporting property. The carrier-transporting polymer is an electron-transporting group, in other words, a polymer having an electron-accepting group in its side chain or main chain, and a polymer having no carrier-transporting property is polymethyl methacrylate. It refers to electrically inactive polymers such as and polystyrene. The low-molecular-weight carrier transporting agent used when it has no carrier-transporting property means a low-molecular-weight material having an electron-transporting property (electron-accepting property), and specifically, an oxadiazol derivative, a triazo-
And a triazine derivative. In the present invention, a hole transport layer and an electron transport light emitting layer are provided to obtain high brightness and stability. The hole-transporting layer is a hole-transporting polymer such as polyvinylcarbazole or polyphenylenevinylene derivative, or a low-molecular compound such as metal phthalocyanine. It is a molecular dispersion of a molecular compound. These layers can be obtained by laminating by means of coating from a solution or vacuum vapor deposition.

【００１１】[0011]

【実施例】更に本発明の実施例を図８をもって更に具体
的に説明する。図８は白色発光デバイスの断面図であ
る。このデバイスはＩＴＯ透明電極の上にホ−ル輸送
層、電子輸送性白色発光層、金属電極からなり、ＩＴＯ
透明電極にプラス、金属電極にマイナスの直流電圧を印
加すると白色発光が得られる。ホ−ル輸送層はポリビニ
ルカルバゾ−ル（ＰＶＫ）で高いホ−ル輸送性を有する
が電子輸送性はない。発光層はポリメチルメタクリレ−
ト（ＰＭＭＡ）中に電子輸送性のオキサジアゾ−ル誘導
体（ＰＢＤ）と発光中心であるテトラフェニルブタジエ
ン（ＴＰＢ）、クマリン６、ＤＣＭ１及びナイルレッド
の蛍光色素が少量含まれている。これらの蛍光色素はそ
れぞれ青（ＴＰＢ）、緑（クマリン６）、黄（ＤＣＭ
１）、赤（ナイルレッド）に発光し、同時に発光するこ
とにより白色となる。発光原理は次のように考えられ
る。まずホ−ルがＩＴＯ透明電極よりＰＶＫへ注入さ
れ、ＰＭＭＡとの界面に達する。ＰＭＭＡ層は電子輸送
性であり、ホ−ルの輸送性が低いのでホ−ルはＰＶＫと
ＰＭＭＡの界面付近でＰＭＭＡにブロックされ、陰極に
達しない。同様に陰極の金属電極から電子輸送性のＰＢ
Ｄを通してＰＭＭＡ層中に注入された電子は電子輸送性
を持たないＰＶＫ層にブロックされ陽極に到達しない。
その結果、電子をホ−ルの再結合が有機層の界面付近あ
るいは若干ホ−ル輸送性を有するＰＢＤを有するＰＭＭ
Ａ層中で起こり蛍光色素を励起し白色に発光する。Embodiment An embodiment of the present invention will be described more specifically with reference to FIG. FIG. 8 is a cross-sectional view of the white light emitting device. This device comprises a hole transport layer, an electron transport white light emitting layer, and a metal electrode on an ITO transparent electrode.
White light emission is obtained by applying a positive DC voltage to the transparent electrode and a negative DC voltage to the metal electrode. The hole transport layer is polyvinyl carbazole (PVK), which has a high hole transport property but does not have an electron transport property. Light emitting layer is polymethylmethacrylate
(PMMA) contains a small amount of an electron-transporting oxadiazol derivative (PBD), tetraphenylbutadiene (TPB) that is the emission center, coumarin 6, DCM1 and a fluorescent dye of Nile red. These fluorescent dyes are blue (TPB), green (coumarin 6), yellow (DCM), respectively.
1), emits light in red (Nile red), and simultaneously emits light to become white. The principle of light emission can be considered as follows. First, a hole is injected into the PVK from the ITO transparent electrode and reaches the interface with PMMA. Since the PMMA layer has an electron-transporting property and the hole-transporting property is low, the hole is blocked by PMMA near the PVK-PMMA interface and does not reach the cathode. Similarly, from the cathode metal electrode to the electron transporting PB
The electrons injected into the PMMA layer through D are blocked by the PVK layer having no electron transporting property and do not reach the anode.
As a result, a PMM having a PBD having electron-hole recombination near the interface of the organic layer or slightly hole-transporting property.
It occurs in the layer A and excites the fluorescent dye to emit white light.

【００１２】図９に輝度−電圧曲線を示すが６ボルトの
低電圧から発光が始まり、最高３００ｃｄ／ｍ2を越え
る輝度が得られる。ブラウン管の輝度が１００ｃｄ／ｍ
2程度であることを考慮するとこのデバイスは実用化に
充分な明るさを有している。また、発光は図１０に示し
たように可視部を広くカバ−するスペクトルを有する白
色光である。図１１から１３には白色発光デバイスとカ
ラ−フィルタ−を組み合わせた図３（ａタイプ）のデバ
イスにおける三色発光の例を示すが、まず図１１には白
色発光デバイスを青色フィルタ−と組み合わせた時のス
ペクトルを示す。発光は青色となりスペクトルにおいて
も赤色部と緑色の一部分がフィルタ−によりカットされ
ていることがわかる。図１２には緑色フィルタ−と組み
合わせた場合のスペクトルを示すがこの場合は青色と赤
色部がカットされ緑色発光のみが取り出されている。図
１３には赤色フィルタ−を使用したときの発光スペクト
ルであるが、青色、緑色がカットされ赤色発光が得られ
ている。A brightness-voltage curve is shown in FIG. 9. Light emission starts from a low voltage of 6 V, and a brightness of more than 300 cd / m 2 can be obtained at the maximum. Brightness of CRT is 100 cd / m
Considering that it is about 2 , this device has sufficient brightness for practical use. Further, the emitted light is white light having a spectrum that covers a wide visible region as shown in FIG. 11 to 13 show examples of three-color light emission in the device of FIG. 3 (a type) in which a white light emitting device and a color filter are combined. First, in FIG. 11, the white light emitting device is combined with a blue filter. The time spectrum is shown. It can be seen that the light emission is blue and the red part and the green part of the spectrum are also cut by the filter. FIG. 12 shows a spectrum when combined with a green filter. In this case, the blue and red parts are cut and only the green emission is extracted. FIG. 13 shows an emission spectrum when a red filter is used, but blue and green are cut to obtain red emission.

【００１３】以上の例より白色発光デバイスとカラ−フ
ィルタ−の組み合わせは発光色の変調に有効であり、図
４のようなカラ−フィルタ−を使用することにより、発
光色の異なる素子（ピクセル）を微細に配置し画素とし
フルカラ−ディスプレイとすることが可能であることが
わかる。From the above example, the combination of the white light emitting device and the color filter is effective for the modulation of the emission color, and by using the color filter as shown in FIG. 4, the elements (pixels) having different emission colors can be obtained. It can be seen that it is possible to arrange the pixels in a minute manner and use them as pixels to provide a full color display.

【００１４】[0014]

【発明の効果】以上述べたように、本発明においては、
少なくともホ−ル輸送層と電子輸送性発光層とを備えた
有機ＥＬデバイスであって、該発光層中にがなるべく可
視光領域を広くカバ−するように二種もしくは複数種の
色素を分散させることによって、発生する光を白色光と
することができ、これをカラ−フィルタ−を組合せるこ
とによって任意の色の発光のみを採りだすことができる
ので、従来のように発光色の異なる素子の微細な配置を
する必要がなく、簡単にフルカラ−デバイスを提供する
ことができる。As described above, according to the present invention,
An organic EL device comprising at least a hole transporting layer and an electron transporting light emitting layer, wherein two or more dyes are dispersed in the light emitting layer so as to cover a visible light region as wide as possible. As a result, the generated light can be white light, and by combining this with a color filter, it is possible to take out only the light emission of an arbitrary color. A full color device can be easily provided without the need for fine arrangement.

【図面の簡単な説明】[Brief description of drawings]

【図１】有機ＥＬデバイスの説明図FIG. 1 is an explanatory diagram of an organic EL device.

【図２】従来のフルカラ−ディスプレイの説明図FIG. 2 is an explanatory view of a conventional full color display.

【図３】有機ＥＬデバイスとカラ−フィルタ−との組合
せた断面説明図FIG. 3 is an explanatory sectional view of a combination of an organic EL device and a color filter.

【図４】本発明で使用するカラ−フィルタ−の平面図及
び断面図FIG. 4 is a plan view and a sectional view of a color filter used in the present invention.

【図５】ガラス基板上にカラ−フィルタ−を載せ、その
上の透明電極を配置した断面図FIG. 5 is a cross-sectional view in which a color filter is placed on a glass substrate and transparent electrodes are arranged on the color filter.

【図６】有機ＥＬデバイスとカラ−フィルタ−との組合
せた断面図FIG. 6 is a sectional view of a combination of an organic EL device and a color filter.

【図７】図６の状態のガラス基板側の平面図FIG. 7 is a plan view of the glass substrate side in the state of FIG.

【図８】本発明の有機ＥＬデバイスの断面図FIG. 8 is a sectional view of an organic EL device of the present invention.

【図９】実施例における輝度−電圧曲線FIG. 9 is a luminance-voltage curve in an example.

【図１０】実施例における発光スペクトルFIG. 10: Emission spectrum in Examples

【図１１】実施例で得られた光に青色フィルタ−を組合
せた光のスペクトルFIG. 11 is a spectrum of light obtained by combining the light obtained in the example with a blue filter.

【図１２】実施例で得られた光に緑色フィルタ−を組合
せた光のスペクトルFIG. 12 is a spectrum of light obtained by combining the light obtained in the example with a green filter.

【図１３】実施例で得られた光に赤色フィルタ−を組合
せた光のスペクトルFIG. 13 is a spectrum of light obtained by combining the light obtained in the example with a red filter.

【符号の説明】[Explanation of symbols]

１ 金属電極（陰極） ２ 有機層 ３ ＩＴＯ透
明電極（陽極） ４ ガラス基板 ５ カラ−フィルタ− ６ 電子
輸送性発光層 ７ ホ−ル輸送層1 Metal Electrode (Cathode) 2 Organic Layer 3 ITO Transparent Electrode (Anode) 4 Glass Substrate 5 Color Filter 6 Electron Transporting Light Emitting Layer 7 Hole Transporting Layer

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 少なくともホ−ル輸送層と電子輸送性発
光層とを備えた有機エレクトロルミネッセンスデバイス
であって、該発光層が少なくとも一種の色素を高分子中
に分散させて白色発光層を構成することを特徴とする有
機エレクトロルミネッセンスデバイス。1. An organic electroluminescent device comprising at least a hole-transporting layer and an electron-transporting light-emitting layer, wherein the light-emitting layer comprises at least one dye dispersed in a polymer to form a white light-emitting layer. An organic electroluminescence device characterized by being. 【請求項２】 電子輸送性の発光層の発光スペクトルが
可視光領域を広くカバ−するように複数種の色素が電子
輸送性発光層に分子分散されて存在していることを特徴
とする請求項１記載の有機エレクトロルミネッセンスデ
バイス。2. A plurality of kinds of dyes are molecularly dispersed in the electron-transporting light-emitting layer so that the emission spectrum of the electron-transporting light-emitting layer covers a wide visible light region. Item 2. The organic electroluminescent device according to item 1. 【請求項３】 電子輸送性発光層がそれ自体キャリア輸
送性を有する高分子中に色素を分子分散して構成される
か、又は、キャリア輸送性を有しない高分子に低分子キ
ャリア輸送材と色素を分子分散していることを特徴とす
る請求項１記載の有機エレクトロルミネッセンスデバイ
ス。3. An electron-transporting light-emitting layer is formed by molecularly dispersing a dye in a polymer having a carrier-transporting property, or a polymer having no carrier-transporting property and a low-molecular carrier-transporting material. The organic electroluminescent device according to claim 1, wherein the dye is molecularly dispersed. 【請求項４】 白色発光層を有する有機エレクトロルミ
ネッセンスデバイスとカラ−フィルタ−とを組合せて発
光色を変調させたことを特徴とする請求項２記載の有機
エレクトロルミネッセンスデバイス。4. The organic electroluminescent device according to claim 2, wherein the emission color is modulated by combining an organic electroluminescent device having a white light emitting layer and a color filter. 【請求項５】 白色発光層を有する有機エレクトロルミ
ネッセンスデバイスと二種以上の異なるカラ−フィルタ
−の組合せにより二種以上の異なる発光色を有するデバ
イスを同一基板上に配置した有機エレクトロルミネッセ
ンスデバイス。5. An organic electroluminescence device in which devices having two or more different emission colors are arranged on the same substrate by a combination of an organic electroluminescence device having a white light emitting layer and two or more different color filters.
JP6008785A 1994-01-28 1994-01-28 Organic electroluminescence device Pending JPH07220871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6008785A JPH07220871A (en) 1994-01-28 1994-01-28 Organic electroluminescence device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6008785A JPH07220871A (en) 1994-01-28 1994-01-28 Organic electroluminescence device

Publications (1)

Publication Number Publication Date
JPH07220871A true JPH07220871A (en) 1995-08-18

Family

ID=11702529

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6008785A Pending JPH07220871A (en) 1994-01-28 1994-01-28 Organic electroluminescence device

Country Status (1)

Country Link
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