JP2734441B2 - Organic thin film EL device - Google Patents
Organic thin film EL deviceInfo
- Publication number
- JP2734441B2 JP2734441B2 JP8013043A JP1304396A JP2734441B2 JP 2734441 B2 JP2734441 B2 JP 2734441B2 JP 8013043 A JP8013043 A JP 8013043A JP 1304396 A JP1304396 A JP 1304396A JP 2734441 B2 JP2734441 B2 JP 2734441B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting layer
- organic thin
- layer
- light emitting
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Landscapes
- Electroluminescent Light Sources (AREA)
- Luminescent Compositions (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，有機薄膜エレクト
ロルミネッセンス（ＥＬ）素子に関し，詳しくは，有機
化合物を含む薄膜を備えたカラーディスプレイのバック
ライト，カラーフィルタ等に用いられる有機薄膜ＥＬ素
子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic thin-film electroluminescence (EL) device, and more particularly to an organic thin-film electroluminescence (EL) device used for a backlight or a color filter of a color display having a thin film containing an organic compound.
【０００２】[0002]
【従来の技術】従来，特開平７−１４２１６９号に示さ
れた有機電界発光素子（有機エレクトロルミネッセンス
素子）が知られている。従来の有機ＥＬ素子，特に，有
機薄膜ＥＬ素子５０は，図３に示すように，透明基板５
１上に形成された陽極５２と，その上に形成された正孔
注入・輸送層５３と，その上に形成された発光層５４
と，発光層５４上に形成された緑色発光層５５と，その
上に形成された陰極５６とを備えている。ここで，緑色
発光層５５は，赤色蛍光色素を含有する領域を有する。2. Description of the Related Art An organic electroluminescent device (organic electroluminescent device) disclosed in Japanese Patent Application Laid-Open No. 7-142169 has been known. As shown in FIG. 3, a conventional organic EL element, in particular, an organic thin film
1, an anode 52, a hole injection / transport layer 53 formed thereon, and a light emitting layer 54 formed thereon.
And a green light emitting layer 55 formed on the light emitting layer 54 and a cathode 56 formed thereon. Here, the green light emitting layer 55 has a region containing a red fluorescent dye.
【０００３】図４は従来の他の有機薄膜ＥＬ素子６０の
例を示す図である。図４を参照すると，有機薄膜ＥＬ素
子６０は透明基板５１上に設けられた陽極５２と，その
上に形成された正孔注入・輸送層５３と，その上に形成
された発光層５４を備え，この発光層５４は，同一平面
上に配置された青色発光層５７，緑色発光層５８，及び
赤色発光層５９とによって構成されている。FIG. 4 is a diagram showing an example of another conventional organic thin film EL device 60. As shown in FIG. Referring to FIG. 4, the organic thin film EL device 60 includes an anode 52 provided on a transparent substrate 51, a hole injection / transport layer 53 formed thereon, and a light emitting layer 54 formed thereon. The light emitting layer 54 includes a blue light emitting layer 57, a green light emitting layer 58, and a red light emitting layer 59 arranged on the same plane.
【０００４】図３及び図４に示す有機薄膜ＥＬ素子５
０，６０は，陽極から正孔が，陰極から電子が注入さ
れ，双方のキャリアが再結合することによって生じるエ
ネルギーによって，励起発光する有機発光層を赤色，緑
色，青色の３原色分もしくは緑色層に赤色蛍光色素を含
有させ，それらを積層もしくは平面的に隣接配置するこ
とにより白色発色を得るものである。この有機薄膜ＥＬ
素子５０，６０は，無機ＥＬ素子が２００Ｖの交流を有
するに比べて，直流で数Ｖで駆動できるという利点を有
している。The organic thin film EL device 5 shown in FIGS. 3 and 4
Reference numerals 0 and 60 denote organic light-emitting layers which emit light by excitation due to energy generated by injection of holes from the anode and electrons from the cathode and recombination of both carriers, for the three primary colors of red, green, and blue or a green layer. A red fluorescent dye is contained in the substrate, and a white color is obtained by laminating or arranging them adjacently in a plane. This organic thin film EL
The elements 50 and 60 have the advantage that they can be driven at a few volts DC, compared to the inorganic EL elements having an AC of 200 volts.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら，図３に
示す積層法では，電極５２及び５３間に挿入される膜数
が多く，膜厚も増えるので，発光開始電圧・電流が増加
するため，発光効率が低いという欠点を有した。また，
多層積層構造であるため，製造工程が複雑であるという
欠点を有した。However, in the lamination method shown in FIG. 3, the number of films inserted between the electrodes 52 and 53 is large, and the film thickness is also increased. It has the disadvantage of low efficiency. Also,
The multi-layer structure has a drawback that the manufacturing process is complicated.
【０００６】また，図４に示す平面配置法では，それぞ
れの発光色の膜５７，５８，及び５９を選択的に形成し
なければならないので製造工程が複雑であるという欠点
を有した。In addition, the planar arrangement method shown in FIG. 4 has a disadvantage that the manufacturing process is complicated because the films 57, 58, and 59 of the respective emission colors must be selectively formed.
【０００７】そこで，本発明の技術的課題は，発光効率
を低下させることなく，白色光を得ることができる有機
薄膜ＥＬ素子を提供することにある。Accordingly, a technical object of the present invention is to provide an organic thin-film EL device capable of obtaining white light without lowering the luminous efficiency.
【０００８】[0008]
【課題を解決するための手段】本発明によれば，印加さ
れた電圧によって青色の光を発光する第１の発光層と，
前記第１の発光層の一面に一面が対向して設けられ，前
記青色の光の一部を吸収して緑色の光の発光するととも
に前記青色の光の残りを透過させる第２の発光層と，一
面が前記第２の発光層の他面に設けられ，前記緑色の光
の一部と前記残りの青色の光の一部とを吸収して赤色の
光を発光するとともに前記緑色の光の残りと前記残りの
青色の光の残りを透過させる第３の発光層とを備えた有
機薄膜ＥＬ素子において，前記第１，第２，及び第３の
発光層は，この順番で積層され，前記第３の発光層の他
面から放出される光は白色光であることを特徴とする有
機薄膜ＥＬ素子が得られる。According to the present invention, a first light emitting layer that emits blue light by an applied voltage;
A second light-emitting layer provided on one side of the first light-emitting layer so as to face the first light-emitting layer, absorbs part of the blue light, emits green light, and transmits the rest of the blue light; , One surface is provided on the other surface of the second light-emitting layer, and absorbs a part of the green light and a part of the remaining blue light to emit red light and emits the green light. In an organic thin-film EL device including a remainder and a third light-emitting layer that transmits the rest of the remaining blue light, the first, second, and third light-emitting layers are stacked in this order; The organic thin-film EL device is characterized in that the light emitted from the other surface of the third light-emitting layer is white light.
【０００９】また，本発明によれば，前記有機薄膜ＥＬ
素子において，前記第１の発光層は，前記電圧を印加す
る電極間に介在して発光部を構成し，前記第２及び第３
の発光層は，前記発光部に対向形成された光変換部で構
成することを特徴とする有機薄膜ＥＬ素子が得られる。Further, according to the present invention, the organic thin film EL
In the device, the first light emitting layer constitutes a light emitting portion interposed between the electrodes to which the voltage is applied, and the second and third light emitting layers constitute the light emitting portion.
The light emitting layer is constituted by a light conversion portion formed opposite to the light emitting portion, thereby obtaining an organic thin film EL device.
【００１０】さらに，本発明によれば，前記いずれかの
有機薄膜ＥＬ素子において，前記発光部と前記光変換部
とは，基板を介して対向形成されていることを特徴とす
る有機薄膜ＥＬ素子が得られる。Further, according to the present invention, in any of the above organic thin film EL devices, the light emitting portion and the light conversion portion are formed to face each other with a substrate interposed therebetween. Is obtained.
【００１１】[0011]
【発明の実施の形態】以下，本発明の実施の形態につい
て図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は本発明の一実施の形態による有機薄
膜ＥＬ素子を示す断面図である。図１を参照して，有機
薄膜ＥＬ素子は，透明基板１の一面に形成された陽極２
と，陽極２の他面に一面が接合されて形成された正孔注
入・輸送層３と，正孔注入・輸送層３の他面に一面が接
合されて形成された青色発光層４と，青色発光層４の他
面に一面が接合されて形成された電子注入・輸送層５
と，電子注入・輸送層５に一面が接合されて形成された
陰極６とを備えている。FIG. 1 is a sectional view showing an organic thin film EL device according to one embodiment of the present invention. Referring to FIG. 1, an organic thin-film EL device includes an anode 2 formed on one surface of a transparent substrate 1.
A hole injection / transport layer 3 formed by bonding one surface to the other surface of the anode 2, a blue light emitting layer 4 formed by bonding one surface to the other surface of the hole injection / transport layer 3, Electron injection / transport layer 5 formed by bonding one surface to the other surface of blue light emitting layer 4
And a cathode 6 having one surface joined to the electron injection / transport layer 5.
【００１３】一方，透明基板の他面には，緑色発色層７
の一面が接合され，緑色発色層７の他面には，赤色発色
層８の一面が接合され，赤色発色層８の他面から白色光
を放出する構成となっている。On the other hand, on the other surface of the transparent substrate, a green coloring layer 7 is provided.
Is joined to the other surface of the green coloring layer 7, and one surface of the red coloring layer 8 is joined to emit white light from the other surface of the red coloring layer 8.
【００１４】透明基板１は透明材料である石英，ガラス
板，通常基板として用いられるポリエステル，ポリメチ
ルメタクリレート，ポリカーボネート，ポリサルホン等
のプラスチックフィルムやシート等が用いられる。The transparent substrate 1 is made of a transparent material such as quartz, a glass plate, or a plastic film or sheet of polyester, polymethyl methacrylate, polycarbonate, polysulfone or the like which is usually used as a substrate.
【００１５】また，陽極２としては，正孔注入障壁の低
減を狙って，仕事関数の小さい材料から選択され，一般
的に透明電極として知られるインジウムチンオキサイド
（ＩＴＯ），ＳｎＯ2 もしくは，膜厚５０ｎｍ程度の金
（Ａｕ）をスパッタリング，真空蒸着法等によって透明
基板１の一面に形成することができる。The anode 2 is selected from materials having a small work function in order to reduce a hole injection barrier, and is generally made of indium tin oxide (ITO), SnO 2 or a film having a thickness known as a transparent electrode. Gold (Au) of about 50 nm can be formed on one surface of the transparent substrate 1 by sputtering, vacuum evaporation, or the like.
【００１６】また，陰極６としては，電子注入壁の低減
を狙って，仕事関数の小さい材料から選択され，前述の
インジウムチンオキサイド（ＩＴＯ），ＳｎＯ2 ，金以
外に，アルミニウム，銀，ニッケル，マグネシウム−銀
合金等をペースト状に塗布あるいは，スパッタリング，
真空蒸着法等によって形成することができる。The cathode 6 is selected from materials having a small work function in order to reduce the electron injection wall. In addition to indium tin oxide (ITO), SnO 2 , and gold, aluminum, silver, nickel, Magnesium-silver alloy etc. is applied in paste form,
It can be formed by a vacuum deposition method or the like.
【００１７】また，正孔注入・輸送層３は，光透過性を
有する材料からなり，陽極２から注入された正孔を青色
発光層４に輸送するためのものであり，その材料として
は，ｐ型水素化非晶質シリコン，Ｐ型水素化非晶質炭化
シリコン，ｐ型硫化亜鉛，ｐ型セレン化亜鉛を用いるこ
とができるが，これらは，真空蒸着法，ＣＶＤ法，プラ
ズマＣＶＤ法，スパッタ法等のドライ成膜により形成さ
れる。The hole injecting / transporting layer 3 is made of a material having a light transmitting property, and is for transporting the holes injected from the anode 2 to the blue light emitting layer 4. P-type hydrogenated amorphous silicon, P-type hydrogenated amorphous silicon carbide, p-type zinc sulfide, and p-type zinc selenide can be used. These are vacuum deposition, CVD, plasma CVD, It is formed by dry film formation such as a sputtering method.
【００１８】尚，他の正孔注入・輸送層３の材料として
は，公知のＮ，Ｎ−ジフェニル−Ｎ，Ｎ´−（３−メチ
ルフェニル）−１，１´−ビフェニール−４，４´−ジ
アミン；１，１−ビス（４−ジ−ｐ−トリルアミノフェ
ニル）シクロヘキサン；４，４´−ビス（Ｎ−（１−ナ
フチル）−Ｎ−フェニルアミノ）ビフェニル等の芳香属
アミン系化合物，ヒドラゾン化合物，シラザン化合物，
キナクリドン化合物，などを用いることができるが，ポ
リビニルカルバゾルやポリシラン等の高分子材料を用い
ることができる。これらの材料は，ポリカーボネート，
ポリアクリレート，ポリエステル等のバインダーととと
もに，有機溶剤に溶解後，塗布乾燥することによって形
成されるが，高分子材料以外の有機材料は，前述の無機
材料と同様に，ドライ成膜によっても形成することがで
きる。Other materials for the hole injection / transport layer 3 include known N, N-diphenyl-N, N '-(3-methylphenyl) -1,1'-biphenyl-4,4'. -Diamine; 1,1-bis (4-di-p-tolylaminophenyl) cyclohexane; aromatic amine compounds such as 4,4'-bis (N- (1-naphthyl) -N-phenylamino) biphenyl; Hydrazone compounds, silazane compounds,
Although a quinacridone compound can be used, a polymer material such as polyvinyl carbazole or polysilane can be used. These materials are polycarbonate,
It is formed by dissolving in an organic solvent together with a binder such as polyacrylate or polyester, and then coating and drying. Organic materials other than the polymer material are also formed by dry film formation in the same manner as the inorganic materials described above. be able to.
【００１９】青色発光層４は，陽極２から正孔注入・輸
送層３を介して輸送された正孔と，陰極６から電子注入
・輸送層５を介して注入された電子との再結合によって
放出されるエネルギーを青色の発光をするもので，この
青色発光層４の材料としては，特開平７−１４２１６９
号公報の化１式に示されるオキサザール金属錯体，同公
報の化２式に示されるジスチリルベンゼン誘導体，同公
報に示されるスチリルアミン含有ポリカーボネート，同
公報化３式に示されるオキサジアゾール誘導体，同公報
の化４式に示されるオキサジアゾール誘導体，同公報に
示されるアゾメチン亜鉛錯体，同公報の化５式及び化６
式に示されるアルミニウム錯体を用いることができ，必
要に応じて，青色蛍光色素をドープすることも可能であ
る。The blue light-emitting layer 4 is formed by the recombination of holes transported from the anode 2 via the hole injection / transport layer 3 and electrons injected from the cathode 6 via the electron injection / transport layer 5. The emitted energy emits blue light. The material of the blue light emitting layer 4 is disclosed in Japanese Patent Application Laid-Open No. 7-142169.
Oxazal metal complex represented by the formula 1 in the publication, distyrylbenzene derivative represented by the formula 2 in the publication, styrylamine-containing polycarbonate represented in the publication, oxadiazole derivative represented by the formula 3 in the publication, Oxadiazole derivatives represented by Formula 4 of the same publication, azomethine zinc complexes shown by the same publication, Chemical formulas 5 and 6 of the same publication
The aluminum complex represented by the formula can be used, and if necessary, a blue fluorescent dye can be doped.
【００２０】また，特開平３−１５２８９７号公報に示
されているように，１，４−ビス（４−エチルスチリ
ル）ベンゼン，１，４−ビス（２−メチル スチリル）
ベンゼン，１，４−ビス（２，２−ジ−ｐ−トリルビニ
ル）ベンゼン等のスチルベン化合物を用いることができ
る。Further, as disclosed in JP-A-3-152897, 1,4-bis (4-ethylstyryl) benzene, 1,4-bis (2-methylstyryl)
Stilbene compounds such as benzene and 1,4-bis (2,2-di-p-tolylvinyl) benzene can be used.
【００２１】また，緑色発色層７は，青色発光層からの
青色の発光に励起され，緑色を発光する色素を含み，そ
の材料としては，特開平３−１５２８９７号公報に示さ
れた公知の８−ヒドロキシキノリンのアルミニウム錯体
等の金属錯体，ナフタルイミド誘導体，チアジアジアゾ
ロピリジン誘導体，ピロロピリジン誘導体，ナフチリジ
ン誘導体等を挙げることができるが，クマリン系緑色蛍
光色素をドープすることもできる。The green coloring layer 7 contains a dye that emits green light when excited by blue light emitted from the blue light emitting layer. The material is a known material disclosed in Japanese Patent Application Laid-Open No. 3-15297. Examples thereof include metal complexes such as aluminum complexes of -hydroxyquinoline, naphthalimide derivatives, thiadiadiazolopyridine derivatives, pyrrolopyridine derivatives, and naphthyridine derivatives, and may also be doped with a coumarin green fluorescent dye.
【００２２】さらに，赤色発光層８は，緑色を吸収して
赤色を発光する色素からなり，その材料としては，特開
平３−１５２８９７号公報に記載の４−ジシアノメチレ
ン−２メチル−６−（ｐ−ジメチルアミノスチルリン）
−４Ｈ−ピラン（ＤＣＭ）等のジシアニン系色素；１−
エチル−２−（４−（ｐ−ジメチルアミノフェニル）−
１，３−ブタジエニル）−ピリジウム−パーコラレイト
（ピリジン１）等しいのピリジン系色素；ローダミン
Ｂ，ローダミン６Ｇ等のキサンテン系色素；他にオキサ
ジン系や，特開平７−１４２１６９号公報に例示されて
いる通り，クマリン色素，アクリジン色素，その他の縮
合芳香族環色素，例えば，フェノキサゾン，フェノキサ
ゾン族６６０等が使用できうる。The red light-emitting layer 8 is made of a dye that absorbs green light and emits red light, and is made of a material such as 4-dicyanomethylene-2methyl-6-(-) described in JP-A-3-152897. p-dimethylaminostillin)
Dicyanine dyes such as -4H-pyran (DCM);
Ethyl-2- (4- (p-dimethylaminophenyl)-
1,3-butadienyl) -pyridium-percolarate (pyridine 1) Equivalent pyridine dyes; xanthene dyes such as rhodamine B and rhodamine 6G; other oxazine dyes; Coumarin dyes, acridine dyes, and other condensed aromatic ring dyes, for example, phenoxazone, phenoxazone family 660 and the like can be used.
【００２３】また，電子注入・輸送層５としては，公知
のｎ−型水素化非晶質シリコンなか，ｎ型硫化亜鉛，ｎ
型セレン化亜鉛等が挙げられる。さらには，特開平７−
１４２１６９号公報の化７式及び化８式で示される化合
物も使用することができる。The electron injecting / transporting layer 5 is made of known n-type hydrogenated amorphous silicon, n-type zinc sulfide, n-type
Zinc selenide and the like. Furthermore, Japanese Patent Laid-Open No.
Compounds represented by the formulas 7 and 8 of 142169 can also be used.
【００２４】図１に示す有機薄膜ＥＬ素子は，透明基板
１にスパッタによりＩＴＯ薄膜を形成し，さらにその上
に，Ｎ，Ｎ´−ジフェニル−Ｎ，Ｎ´−ビス（α−ナフ
チル）−１，１´−ビフェニル−４，４´−ジアミン
（α−ＮＰＤと呼ぶ）を蒸着法によって形成し，その上
に真空蒸着法により，ＰＥＳＢ（１，４−ビス（４−エ
チルスチリル）ベンゼンを蒸着し，さらに，その上に電
子注入層としてアルミキノリンを真空蒸着法で形成し，
その上に，真空蒸着法により陰極６としてマグネシウム
−銀合金薄膜を形成した。また，透明基板１の他面に，
緑色発光層としてクマリン及び赤色発光層（ＤＣＭ）を
夫々樹脂混合して，塗布，乾燥によって形成した。In the organic thin film EL device shown in FIG. 1, an ITO thin film is formed on a transparent substrate 1 by sputtering, and N, N'-diphenyl-N, N'-bis (α-naphthyl) -1 is further formed thereon. , 1'-biphenyl-4,4'-diamine (referred to as α-NPD) is formed by an evaporation method, and PESB (1,4-bis (4-ethylstyryl) benzene is evaporated thereon by a vacuum evaporation method. Aluminum quinoline is further formed thereon as an electron injection layer by vacuum evaporation.
A magnesium-silver alloy thin film was formed thereon as the cathode 6 by a vacuum evaporation method. Also, on the other surface of the transparent substrate 1,
The green light emitting layer was formed by mixing a coumarin and a red light emitting layer (DCM) with a resin, coating, and drying.
【００２５】図２は本発明の第２の実施の形態による有
機薄膜ＥＬ素子を示す断面図である。図２を参照して，
第２の実施の形態による有機薄膜ＥＬ素子は，透明基板
１上に形成された赤色発色層８と，赤色発色層８上に形
成された緑色発色層７と，緑色発色層７上に形成された
と陽極２と，陽極２上に形成された正孔注入・輸送層３
と，正孔注入・輸送層３上に形成された青色発光層４
と，青色発光層４上に形成された電子注入・輸送層５
と，電子注入・輸送層５上に形成された陰極６とを備え
ている。FIG. 2 is a sectional view showing an organic thin film EL device according to a second embodiment of the present invention. Referring to FIG.
The organic thin film EL device according to the second embodiment is formed on a red coloring layer 8 formed on the transparent substrate 1, a green coloring layer 7 formed on the red coloring layer 8, and a green coloring layer 7 formed on the green coloring layer 7. The anode 2 and the hole injection / transport layer 3 formed on the anode 2
And a blue light emitting layer 4 formed on the hole injection / transport layer 3
And an electron injection / transport layer 5 formed on the blue light emitting layer 4
And a cathode 6 formed on the electron injection / transport layer 5.
【００２６】第２の実施の形態による有機薄膜ＥＬ素子
は，第１の実施の形態とは，次の点で異なっている。即
ち，第１の実施の形態による有機薄膜ＥＬ素子は，基板
の外面に緑色発色層７と，赤色発色層８とが積層形成さ
れているのに対して，第２の実施の形態による有機薄膜
ＥＬ素子は，基板の内側に，緑色発色層７と，赤色発色
層８とが積層形成されている点で異なる。第２の実施の
形態による各層材料は，第１の実施の形態と同様であ
る。The organic thin-film EL device according to the second embodiment differs from the first embodiment in the following points. That is, the organic thin-film EL device according to the first embodiment has a green coloring layer 7 and a red coloring layer 8 laminated on the outer surface of the substrate, whereas the organic thin-film EL element according to the second embodiment is different. The EL element is different in that a green coloring layer 7 and a red coloring layer 8 are formed inside a substrate. Each layer material according to the second embodiment is the same as that of the first embodiment.
【００２７】本発明の一実施の形態においては，正孔／
電子の再結合エネルギーで励起発光する層は，最もエネ
ルギーの高い青色発光層のみとし，この青色光が出射す
る側の電気的には分離された面に青色の光エネルギーを
吸収して緑色に発光する層と，緑〜青色の光エネルギー
を吸収して赤色に発光する層とを順に積層することによ
って形成されているので，エネルギー効率を高めること
ができる。In one embodiment of the present invention, holes /
Only the blue light-emitting layer with the highest energy is excited and emits light by the recombination energy of electrons, and absorbs the blue light energy on the electrically separated surface on the side from which the blue light exits to emit green light. And a layer that absorbs green to blue light energy and emits red light in order, thereby improving energy efficiency.
【００２８】[0028]
【発明の効果】以上，説明したように，本発明によれ
ば，電気エネルギーを必要とするＥＬによる発光は，青
色発光層のみで，他の色はＰＬによって発光するので，
一つのＥＬ層にドーパントとして夫々の色素添加した場
合に，この色素がエネルギーのトラップになるが，これ
に比較して，発光効率を低下させることがない有機薄膜
ＥＬ素子を提供することができる。As described above, according to the present invention, light emission by EL requiring electric energy is emitted only from the blue light-emitting layer, and other colors are emitted by PL.
When each dye is added as a dopant to one EL layer, the dye serves as an energy trap. However, it is possible to provide an organic thin-film EL device in which the luminous efficiency is not reduced as compared with this.
【図１】本発明の第１の実施の形態による有機薄膜ＥＬ
素子を示す断面図である。FIG. 1 shows an organic thin film EL according to a first embodiment of the present invention.
It is sectional drawing which shows an element.
【図２】本発明の第２の実施の形態による有機薄膜ＥＬ
素子を示す断面図である。FIG. 2 shows an organic thin film EL according to a second embodiment of the present invention.
It is sectional drawing which shows an element.
【図３】従来技術１による有機薄膜ＥＬ素子を示す断面
図である。FIG. 3 is a cross-sectional view showing an organic thin-film EL device according to Prior Art 1.
【図４】従来技術２による有機薄膜ＥＬ素子を示す断面
図である。FIG. 4 is a cross-sectional view showing an organic thin-film EL device according to Prior Art 2.
１ 透明基板 ２ 陽極 ３ 正孔注入・輸送層 ４ 青色発光層 ５ 電子注入・輸送層 ６ 陰極 ７ 緑色発色層 ８ 赤色発色層 ５０ 有機薄膜ＥＬ素子 ５１ 透明薄板 ５２ 陽極 ５３ 正孔注入・輸送層 ５４ 発光層 ５５ 緑色発光層 ５６ 陰極 ５７ 青色発光層 ５８ 緑色発光層 ５９ 赤色発光層 ６０ 有機薄膜ＥＬ素子 DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Anode 3 Hole injection / transport layer 4 Blue light emitting layer 5 Electron injection / transport layer 6 Cathode 7 Green coloring layer 8 Red coloring layer 50 Organic thin film EL element 51 Transparent thin plate 52 Anode 53 Hole injection / transport layer 54 Light emitting layer 55 Green light emitting layer 56 Cathode 57 Blue light emitting layer 58 Green light emitting layer 59 Red light emitting layer 60 Organic thin film EL element
Claims (3)
する第１の発光層と，前記第１の発光層の一面に一面が
対向して設けられ，前記青色の光の一部を吸収して緑色
の光の発光するとともに前記青色の光の残りを透過させ
る第２の発光層と，一面が前記第２の発光層の他面に設
けられ，前記緑色の光の一部と前記残りの青色の光の一
部とを吸収して赤色の光を発光するとともに前記緑色の
光の残りと前記残りの青色の光の残りを透過させる第３
の発光層とを備えた有機薄膜ＥＬ素子において，前記第
１，第２，及び第３の発光層は，この順番で積層され，
前記第３の発光層の他面から放出される光は白色光であ
ることを特徴とする有機薄膜ＥＬ素子。1. A first light-emitting layer that emits blue light by an applied voltage, and a first light-emitting layer, one surface of which is provided to face one surface and absorbs a part of the blue light. A second light emitting layer that emits green light and transmits the rest of the blue light, and one surface is provided on the other surface of the second light emitting layer, and a portion of the green light and the remaining A third type that absorbs a part of the blue light to emit red light and transmits the remaining green light and the remaining blue light.
The first, second, and third light-emitting layers are stacked in this order,
The light emitted from the other surface of the third light emitting layer is white light.
て，前記第１の発光層は，前記電圧を印加する電極間に
介在して発光部を構成し，前記第２及び第３の発光層
は，前記発光部に対向形成された光変換部で構成するこ
とを特徴とする有機薄膜ＥＬ素子。2. The organic thin-film EL device according to claim 1, wherein said first light-emitting layer constitutes a light-emitting portion interposed between electrodes to which said voltage is applied, and said second and third light-emitting layers. Is an organic thin-film EL device comprising a light conversion portion formed opposite to the light-emitting portion.
において，前記発光部と前記光変換部とは，基板を介し
て対向形成されていることを特徴とする有機薄膜ＥＬ素
子。3. The organic thin film EL device according to claim 1, wherein the light emitting portion and the light converting portion are formed to face each other with a substrate interposed therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8013043A JP2734441B2 (en) | 1996-01-29 | 1996-01-29 | Organic thin film EL device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8013043A JP2734441B2 (en) | 1996-01-29 | 1996-01-29 | Organic thin film EL device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09204982A JPH09204982A (en) | 1997-08-05 |
| JP2734441B2 true JP2734441B2 (en) | 1998-03-30 |
Family
ID=11822097
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8013043A Expired - Fee Related JP2734441B2 (en) | 1996-01-29 | 1996-01-29 | Organic thin film EL device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2734441B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070315C (en) * | 1998-11-06 | 2001-08-29 | 吉林大学 | White-light electroluminescence device with organic multi-quantum pit structure |
| DE19902750A1 (en) * | 1999-01-25 | 2000-08-03 | Osram Opto Semiconductors Gmbh | Semiconductor component for generating mixed-colored electromagnetic radiation |
| DE19916745A1 (en) * | 1999-04-13 | 2000-10-19 | Mannesmann Vdo Ag | Light-emitting diode with organic light-emitting substances for generating light with mixed colors |
| US7294439B2 (en) | 2003-04-01 | 2007-11-13 | Fuji Electric Holdings Co., Ltd. | Color-converting filter and manufacturing method |
| KR101160840B1 (en) * | 2005-05-31 | 2012-06-29 | 삼성전자주식회사 | Display device and method of making the same |
| KR100797529B1 (en) * | 2006-07-27 | 2008-01-24 | 주식회사 대우일렉트로닉스 | White organic light emitting diode device and method for manufacturing the same |
| EP2304823A4 (en) * | 2008-06-26 | 2011-08-10 | Du Pont | Organic light-emitting diode luminaires |
| TW201121117A (en) | 2009-08-24 | 2011-06-16 | Du Pont | Organic light-emitting diode luminaires |
| CN102484214A (en) | 2009-08-24 | 2012-05-30 | E.I.内穆尔杜邦公司 | Organic light-emitting diode luminaires |
-
1996
- 1996-01-29 JP JP8013043A patent/JP2734441B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH09204982A (en) | 1997-08-05 |
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