JPH07220871A - Organic electroluminescence device - Google Patents

Organic electroluminescence device

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JPH07220871A
JPH07220871A JP878594A JP878594A JPH07220871A JP H07220871 A JPH07220871 A JP H07220871A JP 878594 A JP878594 A JP 878594A JP 878594 A JP878594 A JP 878594A JP H07220871 A JPH07220871 A JP H07220871A
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layer
light
emitting layer
color
organic electroluminescent
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Japanese (ja)
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Junji Kido
淳二 城戸
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Res Dev Corp Of Japan
新技術事業団
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3206Multi-colour light emission
    • H01L27/3211Multi-colour light emission using RGB sub-pixels
    • H01L27/3213Multi-colour light emission using RGB sub-pixels using more than three sub-pixels, e.g. RGBW
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L51/00Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof
    • H01L51/50Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for light emission, e.g. organic light emitting diodes [OLED] or polymer light emitting devices [PLED];
    • H01L51/5012Electroluminescent [EL] layer
    • H01L51/5036Multi-colour light emission, e.g. colour tuning, polymer blend, stack of electroluminescent layers

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− The present invention relates to a visible light region is driven at a low voltage cover - electroluminescence having a white light-emitting layer of high luminance (hereinafter, simply referred to as EL) thin-film organic EL which emits light on the basis of device, and this and the color -
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。 Filter - relates to a light emitting any color combination, a thin film-type organic EL device.

【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。 Recently, organic EL devices Wa - Dopurossesa and Pas - Sonarukonbyu - data - of Desupurei applicable to, and to obtain a high performance organic EL device which emits light of high driven at Therefore low voltage intensity various studies have been conducted. 有機ELデバイスの典型的な構造を図1に示す。 The typical structure of an organic EL device shown in FIG. 図1において、インジウム−スズ酸化物(ITO) In Figure 1, indium - tin oxide (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。 In which the thin film layer was laminated made of an organic material on a transparent substrate such as bets glass was laminated metal electrodes, such as magnesium thereon which - a transparent electrode such as co. 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。 Organic materials of the polymer material and a low-molecular material, a metal complex is used, it is formed by a coating or vacuum deposition from the solution by the material. 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、 The organic layer in the organic EL device is divided into multilayer laminated layer type or multiple different materials formed of a single layer, light emitted from the organic layer is a transparent electrode,
ガラス基板を通して取り出すことができる。 It can be taken out through the 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。 As an example of the organic EL device, there is that the structure as shown in FIG. 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、 That is, for example, indium - transparent electrode such as tin oxide (ITO) is co - host to Sorted transparent substrate - laminating a thin film layer made of an organic material by laminating a Le transport layer and the electron transport light-emitting layer, be one obtained by laminating a metal electrode such as magnesium thereon,
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、 When a voltage is applied thereto, Ho than ITO - Le injection, also electron injection performed from a metal electrode, such as magnesium,
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。 Ho - Le transport layer carried been have been ho - le is again injected into the electron transporting light-emitting layer, whereas, since the light-emitting layer also serves as an electron transporting property, electrons injected from the electron injecting electrode luminescent layer move the middle, e - not implanted into Le transport layer. 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。 The host is injected into the light-emitting layer - Le so hardly move an electron transporting light emitting layer electron and e - Le emits light in both combine in the organic layer near the interface of the light emitting layer side. 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。 Then, light emitted from the organic layer is to be Dasa taken to the outside through the transparent electrode and the transparent substrate. 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。 The color of light emission at this time is determined by the luminescent color of the light-emitting layer, Monokara - a.

【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。 [0004] Therefore, the external full color - the begin taken as display, red, green, needs to be one pixel by combining three kinds of fine elements of the blue light-emitting pixels. 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。 However, usually, as the method of manufacturing the organic EL devices, have been made by coating means from the vacuum deposition or a solution, it is extremely difficult to finely position the different elements of emission colors by a vacuum deposition method or a coating unit 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− [SUMMARY OF THE INVENTION Therefore, the present inventors have full color by a simple way - does give a display when a result of various studies, by dispersing a combination of at least one or several of the dye in the light-emitting layer visible light area as wide as possible cover - to form a light-emitting layer, than this color - filter -
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。 It found that could out take any emission color at, and completed the present invention, an object of the present invention is full color by a simple way - is to provide an organic EL device that allows actuating the display.

【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。 Means for Solving the Problems] gist least ho of the first invention of the present application - an organic electroluminescent device comprising a Le transport layer and the electron transporting light emitting layer, at least one dye to the light emitting layer the an organic electroluminescent device, characterized in that constitutes a white-light-emitting layer is dispersed in a polymer, the gist of the second invention, in the organic EL device, the emission spectrum of the electron transporting light-emitting layer there broadly cover the visible light region - is characterized in that the plural kinds of dyes are present is molecularly dispersed electron transporting luminescent layer to. 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 The gist of the third invention, in the first aspect, or the electron transport luminescent layer is constituted by molecular dispersion of the dye in a polymer having itself a carrier transport property, or a carrier transporting property it is an organic EL device, characterized in that the low-molecular carrier transport material and the dye is molecularly dispersed without polymer, 4th
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。 Filter - - Organic EL devices and color gist of invention having a white light emitting layer of the organic EL device, characterized in that the allowed modulating the emission color by combining, also, the gist of the fifth invention of the white light emitting layer the organic EL device and the two or more different color with - filter - is an organic EL device arranged a device on the same substrate with different luminescent colors of two or more by a combination of.

【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、 [0007] That is, in the present invention, as wide as possible cover the visible light region in the light-emitting layer - and to emit white light, forming a light-emitting layer at least one or several of the dyes dispersed in a polymer and, the light-emitting layer and a white light-emitting layer,
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。 This color - filter - and to take out an arbitrary emission color combination, without the need for fine placement of the light-emitting layer, combined color - filter - by a fine arrangement, red, green, and blue 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− [0008] color in the present invention - filter - placement of the insertion or between the transparent electrode and the glass substrate such or disposed on a glass substrate surface, or ITO, it may be any method, modulation of the emission color different shells - filter -
を用いることにより容易に行うことができる。 It can be easily performed by using a. これを図示すると図3のようになる。 This is illustrated in Figure 3. 図3は、カラ−フィルタ− 3, color - filter -
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。 And a cross-sectional view of the combination of the organic EL device, in FIG. 3, (a) color - filter - a case where a placed on the glass substrate surface, (b) was inserted between the transparent electrode and the glass substrate it is the case. 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。 White light emitted from the light emitting layer in any case color - filter - by passing through, it is possible to color modulation. 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。 Accordingly, modulation of the emission color different color - filter - can be easily performed by using a. 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。 Thus, this method uses only the white light emitting layer is different from the fine arrangement of the three colors of the light emitting element, color - filter - made possible by the finely arranged.

【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。 [0009] Thus, color used in the present invention - filter - an outline of the view shown in FIG. 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。 In FIG. 4, (a) is its plan view, (b) is a cross-sectional view thereof. 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。 As shown in FIG. 4, the red, green, color combining three primary colors of blue - filter - can be prepared by simple methods such as by printing. そして、カラ−フィルタ− Then, color - filter -
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。 A transparent electrode disposed on the upper, to form the whole organic layer thereon, the fine arrangement of different organic emission colors is not necessary. この状態を図5に示す。 This state is shown in FIG. 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。 In this way, the formed organic layer is a layer which emits white light, by forming the electrodes so as to be perpendicular thereto (see FIG. 6), the intersection of the metal electrode and the ITO electrode becomes capable of emitting light, the simple matrix drive full color - the display. 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。 Figure 7 is shown a state in which were three colors simultaneously luminescence when viewed from the glass substrate side.

【0010】次に本発明について詳細に述べる。 [0010] Next will be described in detail the present invention. 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。 Transparent electrodes such as as the anode electrode used in the present invention ITO, a small work function metal such as lithium or magnesium, or its alloys used for the cathode. 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。 By applying a voltage of a DC or AC between the electrodes may typically applies a voltage of the order of a range of 2 volts to 30 volts.
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。 The dye used in the present invention, not particularly limited, for example, coumarin derivatives, organic dyes and metal complexes such as DLM compounds are used. 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。 This dye, either by molecularly dispersed in a carrier transporting property in the polymer, or, is molecularly dispersed in a polymer of low molecular carrier transport material and a dye having no carrier-transport property. 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。 The carrier transporting property of the polymer and the electron transporting groups, said changing it refers to a polymer having an electron-accepting group in the side chain or main chain, a polymer having no carrier-transport property and the polymethyl methacrylate - DOO and it refers to the electrically inert polymer such as polystyrene. 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− Then, the low-molecular carrier transport material to be used when no carrier-transport property be in say a low molecular material of the electron transport property (electron-accepting), specifically oxadiazole - Le derivatives, triazole -
ル誘導体、トリアジン誘導体等をいう。 Le derivative refers to triazine derivatives. 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。 In the present invention, e to obtain the high brightness and stability - the more the Le transporting layer and the electron transporting light emitting layer. 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。 The e - Polyvinyl carbazolenevinylene as Le transport layer - ho include Le and polyphenylene vinylene derivatives - Le transporting polymer and a low molecular compound such as a metal phthalocyanine, low in the polymer as the electron transport light-emitting layer the molecular compound is obtained by molecular dispersion. 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。 These layers are obtained by laminating by means such as coating or vacuum deposition from solution.

【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。 EXAMPLES be described more specifically further embodiment of the present invention with FIG. 図8は白色発光デバイスの断面図である。 Figure 8 is a cross-sectional view of a white light emitting device. 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 The device E on the ITO transparent electrode - le transport layer, an electron transporting white light emitting layer, a metal electrode, 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。 Plus transparent electrode, by applying a negative DC voltage to the metal electrode white light emission can be obtained. 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。 E - le transport layer polyvinyl carbazolenevinylene - high Ho Le (PVK) - has a Le transporting no electron transporting property. 発光層はポリメチルメタクリレ− The light-emitting layer polymethyl methacrylate -
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。 Preparative (PMMA) electron transporting properties oxadiazole - is an emission center Le derivative (PBD) tetraphenyl butadiene (TPB), coumarin 6, DCM1 and Nile Red fluorescent dye is contained in small amounts. これらの蛍光色素はそれぞれ青(TPB)、緑(クマリン6)、黄(DCM Each of these fluorescent dyes are blue (TPB), green (coumarin 6), yellow (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。 1), the device emitted red (Nile Red), the white by emitting at the same time. 発光原理は次のように考えられる。 The light-emitting principle is considered in the following manner. 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。 Mazuho - Le are injected from the ITO transparent electrode to PVK, it reaches the interface between the PMMA. 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。 PMMA layer is an electron transporting property, ho - because of the low le of transporting ho - le are blocked in PMMA near the interface of PVK and PMMA, it does not reach the cathode. 同様に陰極の金属電極から電子輸送性のPB Similarly metal electrode on the cathode of the electron-transporting property 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。 Electrons injected into PMMA layer through D does not reach the anode is blocked PVK layer having no electron transporting property.
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 As a result, electrons e - PMM having a PBD having Le transporting - surface near or slightly ho recombination organic layer Le
A層中で起こり蛍光色素を励起し白色に発光する。 Exciting the occur fluorescent dye A layer emits 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/m 2を越える輝度が得られる。 [0012] luminance 9 - emission shows a voltage curve from a low voltage of 6 volts begins, luminance exceeding the highest 300 cd / m 2 is obtained. ブラウン管の輝度が100cd/m Cathode-ray tube of brightness is 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。 The device has a sufficient brightness in practical considering that it is a 2. 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。 The light emitting broadly cover the visible portion as shown in FIG. 10 - is a white light having a spectrum. 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。 Shows an example of a three-color light emission in the device of Figure that combines 3 (a type), a white light emitting device blue filter first 11 - - in FIG. 11 from 13 white light-emitting device and a color - filter in combination with It shows a spectrum of time. 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。 Emitting the red part and the green part also in the spectrum becomes blue filter - it can be seen that are cut by the. 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。 Green filter 12 - shows the spectrum when combined that only the blue and red portions are cut if green emission is taken out. 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。 The 13 red filter - although the emission spectrum when using blue, green is cut red emission is obtained.

【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。 [0013] white light emitting device from the above example color - filter - combination of is effective in modulation of the emission color, color, such as 4 - filter - by the use of the emission color different elements (pixels) the finely arranged with a pixel full color - it can be seen that it is possible to display.

【0014】 [0014]

【発明の効果】以上述べたように、本発明においては、 As described above, according to the present invention, in the invention,
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。 At least E - an organic EL device with a Le transport layer and the electron-transport luminescent layer, is as wide as possible cover the visible light region to the light emitting layer - dispersing two or more kinds of dyes to by the generated light can be white light, which color - filter - it is possible to begin taking only light emission of any color by combining, in different elements of emission colors as in the conventional there is no need to fine arrangement, easy full color - it is possible to provide a device.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】有機ELデバイスの説明図 FIG. 1 is an explanatory view 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 a conventional full color - explanatory diagram of a 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 [3] The organic EL devices and color - filter - combination of a cross-sectional view

【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 [4] color used in the present invention - filter - plan view and a cross-sectional view of a

【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 [5] color on a glass substrate - filter - a loaded, cross-sectional view of arranging the transparent electrodes thereon

【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 [6] The organic EL devices and color - filter - combination of cross-sectional views

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

【図8】本発明の有機ELデバイスの断面図 Figure 8 is a cross-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 [9] luminance in Example - voltage curve

【図10】実施例における発光スペクトル [10] emission in Example spectrum

【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 [11] blue filter on the light obtained in Example - spectrum of the combined light

【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 [12] green filter in the light obtained in Example - spectrum of the combined light

【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 [13] red filter the resulting light in Example - spectrum of the combined light

【符号の説明】 DESCRIPTION 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 First metal electrode (cathode) 2 organic layer 3 ITO transparent electrode (anode) 4 glass substrate 5 color - filter - 6 electron transport luminescent layer 7. ho - le transport layer

Claims (5)

    【特許請求の範囲】 [The claims]
  1. 【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. A least E - an organic electroluminescent device comprising a Le transport layer and the electron transport light-emitting layer, constituting a white light emitting layer light emitting layer is at least one dye is dispersed in a polymer the organic electroluminescent device, characterized by.
  2. 【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。 Claims, characterized in that the plural kinds of dyes are present is molecularly dispersed electron transporting luminescent layer to - 2. A light emission spectrum of the electron-transporting light-emitting layer is wide cover the visible light region the organic electroluminescent device of claim 1, wherein.
  3. 【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。 Or wherein the electron transport luminescent layer is constituted by molecular dispersion of the dye in a polymer having itself a carrier transport property, or a low-molecular carrier transport material carrier transportability without polymer the organic electroluminescent device according to claim 1, characterized in that the molecularly dispersed dyes.
  4. 【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 and the color with a white light-emitting layer - filter - an organic electroluminescent device according to claim 2, characterized in that by modulating the emission color by combining.
  5. 【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. The white light emitting layer organic electroluminescent device and two or more different color with - filter - organic electroluminescent device arranged a device on the same substrate having two or more different emission colors by a combination of.
JP878594A 1994-01-28 1994-01-28 Organic electroluminescence device Pending JPH07220871A (en)

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