JPH10255982A - Organic electroluminescent(el) element - Google Patents
Organic electroluminescent(el) elementInfo
- Publication number
- JPH10255982A JPH10255982A JP9069076A JP6907697A JPH10255982A JP H10255982 A JPH10255982 A JP H10255982A JP 9069076 A JP9069076 A JP 9069076A JP 6907697 A JP6907697 A JP 6907697A JP H10255982 A JPH10255982 A JP H10255982A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- organic
- transparent electrode
- emitting layer
- electrode
- 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
Links
- 239000000463 material Substances 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 239000007772 electrode material Substances 0.000 claims abstract description 5
- 230000005525 hole transport Effects 0.000 claims abstract description 4
- 238000003475 lamination Methods 0.000 claims abstract 2
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000010030 laminating Methods 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 abstract description 9
- 239000011521 glass Substances 0.000 abstract description 4
- 229910052737 gold Inorganic materials 0.000 abstract description 4
- 239000000243 solution Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 52
- 238000000034 method Methods 0.000 description 8
- 239000010409 thin film Substances 0.000 description 6
- 238000005513 bias potential Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- -1 aluminum chelate complex Chemical class 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- VOFUROIFQGPCGE-UHFFFAOYSA-N nile red Chemical compound C1=CC=C2C3=NC4=CC=C(N(CC)CC)C=C4OC3=CC(=O)C2=C1 VOFUROIFQGPCGE-UHFFFAOYSA-N 0.000 description 2
- 150000004866 oxadiazoles Chemical class 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 125000006617 triphenylamine group Chemical group 0.000 description 2
- WZMYZTPLFRSOPH-UHFFFAOYSA-N 1,3-benzoxazole;thiophene Chemical class C=1C=CSC=1.C1=CC=C2OC=NC2=C1 WZMYZTPLFRSOPH-UHFFFAOYSA-N 0.000 description 1
- UHXOHPVVEHBKKT-UHFFFAOYSA-N 1-(2,2-diphenylethenyl)-4-[4-(2,2-diphenylethenyl)phenyl]benzene Chemical compound C=1C=C(C=2C=CC(C=C(C=3C=CC=CC=3)C=3C=CC=CC=3)=CC=2)C=CC=1C=C(C=1C=CC=CC=1)C1=CC=CC=C1 UHXOHPVVEHBKKT-UHFFFAOYSA-N 0.000 description 1
- ZMLPKJYZRQZLDA-UHFFFAOYSA-N 1-(2-phenylethenyl)-4-[4-(2-phenylethenyl)phenyl]benzene Chemical group C=1C=CC=CC=1C=CC(C=C1)=CC=C1C(C=C1)=CC=C1C=CC1=CC=CC=C1 ZMLPKJYZRQZLDA-UHFFFAOYSA-N 0.000 description 1
- POXIZPBFFUKMEQ-UHFFFAOYSA-N 2-cyanoethenylideneazanide Chemical class [N-]=C=[C+]C#N POXIZPBFFUKMEQ-UHFFFAOYSA-N 0.000 description 1
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 150000004982 aromatic amines Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- VBVAVBCYMYWNOU-UHFFFAOYSA-N coumarin 6 Chemical compound C1=CC=C2SC(C3=CC4=CC=C(C=C4OC3=O)N(CC)CC)=NC2=C1 VBVAVBCYMYWNOU-UHFFFAOYSA-N 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 150000007857 hydrazones Chemical class 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002979 perylenes Chemical class 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 150000003557 thiazoles Chemical class 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
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]
- H10K50/17—Carrier injection layers
- H10K50/171—Electron injection layers
Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、平面光源やディ
スプレイに用いられる有機ＥＬ素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL device used for a flat light source and a display.
【０００２】[0002]
【従来の技術】従来、例えば有機ＥＬ（エレクトロルミ
ネッセンス）素子は、ガラス基板に透光性のＩＴＯ膜の
陽極を形成し、その上面に有機ＥＬ材料であるトリフェ
ニルアミン誘導体（ＴＰＤ）等のホール輸送材料及びア
ルミキレート錯体（Ａｌｑ3）等の電子輸送性発光材料
等を積層している。そしてその上面に、Ａｌ，Ｌｉ，Ａ
ｇ，Ｍｇ，Ｉｎ等の陰極を形成している。この有機ＥＬ
素子は、ＩＴＯ膜の陽極とＡｌ−Ｍｇ等の背面電極であ
る陰極間に所定の電圧が印加され、発光を生じるもので
ある。2. Description of the Related Art Conventionally, for example, an organic EL (electroluminescence) element is formed by forming a light-transmitting ITO film anode on a glass substrate and forming a hole such as a triphenylamine derivative (TPD) as an organic EL material on the upper surface thereof. A transport material and an electron transporting light emitting material such as an aluminum chelate complex (Alq 3 ) are laminated. And on the upper surface, Al, Li, A
A cathode of g, Mg, In or the like is formed. This organic EL
The device emits light when a predetermined voltage is applied between the anode of the ITO film and the cathode, which is a back electrode of Al-Mg or the like.
【０００３】[0003]
【発明が解決しようとする課題】ここで、ＥＬは、仕事
関数の大きいＩＴＯから発光層へホールの注入がなさ
れ、仕事関数の小さい陰極からは、電子が供給されるこ
とにより発光するものである。従って、このＩＴＯと背
面電極の極性を逆にして逆バイアスをかけると、上記ホ
ールと電子の注入が起こりにくく、発光が見られない。
また、電子輸送材料とホール輸送材料を順次積層した構
造の場合、逆バイアスであれば、ホールと電子が僅かに
注入されたとしても発光はしない。従って、一つの有機
ＥＬ素子において、両極性でＥＬ発光可能な素子は従来
なかった。Here, the EL is a device in which holes are injected into the light emitting layer from ITO having a large work function, and light is emitted when electrons are supplied from a cathode having a small work function. . Therefore, when a reverse bias is applied by reversing the polarity of the ITO and the back electrode, the injection of holes and electrons hardly occurs, and no light emission is observed.
Further, in the case of a structure in which an electron transporting material and a hole transporting material are sequentially laminated, no light emission occurs even if a small amount of holes and electrons are injected with a reverse bias. Therefore, there has not been a single organic EL element capable of emitting EL light in both polarities.
【０００４】この発明は、上記従来の技術に鑑みてなさ
れたもので、簡単な構成で、両極性で発光可能な有機Ｅ
Ｌ素子を提供することを目的とする。The present invention has been made in view of the above-mentioned conventional technology, and has a simple structure and is capable of emitting light in both polarities.
An object is to provide an L element.
【０００５】[0005]
【課題を解決するための手段】この発明は、ガラス等の
透明基板上にＩＴＯ等の透明な電極材料であり仕事関数
の大きい透明電極と、この透明電極に積層されホール輸
送材料及び電子輸送材料を含む有機ＥＬ材料の発光層
と、この有機ＥＬ材料の発光層に積層されＡｕやＡｌ等
の仕事関数の大きい電極材料による背面電極を形成し、
上記有機ＥＬ材料の発光層と透明電極及び背面電極との
各積層部分に、１〜数十Å程度の厚さに仕事関数の小さ
いＬｉやＭｇ等の金属からなる電子注入層を、島状、穴
あき状、ストライプ状、または網目状等のほぼ均等に部
分的に形成した有機ＥＬ素子である。SUMMARY OF THE INVENTION The present invention provides a transparent electrode having a large work function such as ITO on a transparent substrate such as glass, a hole transport material and an electron transport material laminated on the transparent electrode. A light emitting layer of an organic EL material containing: and a back electrode made of an electrode material having a large work function such as Au or Al laminated on the light emitting layer of the organic EL material;
An electron injection layer made of a metal such as Li or Mg having a small work function and having a thickness of about 1 to several tens of kilometers is formed on each laminated portion of the light emitting layer of the organic EL material and the transparent electrode and the back electrode, in an island shape, It is an organic EL element formed almost uniformly and partially in a hole shape, a stripe shape, a mesh shape or the like.
【０００６】また、上記有機ＥＬ材料の発光層を積層構
造として、中央にホールブロック層を形成し、その両側
に、各々異なる発光材料を含有した発光層を形成した有
機ＥＬ素子である。Further, the present invention is an organic EL device having a light emitting layer of the organic EL material as a laminated structure, a hole blocking layer formed in the center, and light emitting layers containing different light emitting materials formed on both sides thereof.
【０００７】この発明の有機ＥＬ素子は、透明電極側を
陽極、背面電極側を陰極とした順バイアス電位を印加し
た場合は、仕事関数の高いＩＴＯ等の透明電極から有機
ＥＬ材料の発光層へホールの注入が行なわれるととも
に、陰極である背面電極側では仕事関数の低いＬｉ等の
電子注入層から電子の注入が行なわれる。また、逆に透
明電極側を陰極、背面電極側を陽極とした逆バイアス電
位を印加した場合、仕事関数の高いＡｕ等の背面電極か
ら有機ＥＬ材料の発光層へホールの注入が行なわれると
ともに、陰極となる透明電極側では仕事関数の低いＬｉ
等の電子注入層から電子の注入が行なわれる。In the organic EL device of the present invention, when a forward bias potential with the transparent electrode side as the anode and the back electrode side as the cathode is applied, the transparent electrode such as ITO having a high work function is transferred from the transparent electrode such as ITO to the light emitting layer of the organic EL material. At the same time as holes are injected, electrons are injected from an electron injection layer of Li or the like having a low work function on the back electrode side serving as a cathode. Conversely, when a reverse bias potential with the transparent electrode side as the cathode and the back electrode side as the anode is applied, holes are injected from the back electrode such as Au having a high work function into the light emitting layer of the organic EL material, and Li with a low work function on the side of the transparent electrode serving as the cathode
Are injected from the electron injection layer.
【０００８】また、誘起材料の発光層を各々異なる発光
材料を含有した発光層を形成したことにより、透明電極
と背面電極の電位が順バイアス時と逆バイアス時とで、
中央のホールブロック層により隣接層へホールの注入が
阻止され、異なる発光を可能にするものである。Further, by forming a light emitting layer containing a different light emitting material as the light emitting layer of the inducing material, the potentials of the transparent electrode and the back electrode are changed when the forward bias and the reverse bias are applied.
The hole is prevented from being injected into the adjacent layer by the central hole blocking layer, thereby enabling different light emission.
【０００９】[0009]
【発明の実施の形態】以下、この発明の実施の形態につ
いて図面を基にして説明する。図１、図２はこの発明の
有機ＥＬ素子の第一実施形態を示すもので、この実施形
態の有機ＥＬ素子は、図示するように、ガラス、透明樹
脂、石英等の透明基板１０の表面に、ＩＴＯ等の仕事関
数の大きい透明な金属材料からなる透明電極１２が１μ
ｍ程度の厚さに形成されている。透明電極１２の表面に
は、有機ＥＬ材料による発光層１４が数百Å程度の厚さ
に形成されている。そして、発光層１４の表面には、Ａ
ｕやＡｌ等の仕事関数の大きい金属からなる背面電極１
６が１０００Å程度の厚さに形成されている。Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment of the organic EL device of the present invention. As shown in the drawing, the organic EL device is provided on a surface of a transparent substrate 10 made of glass, transparent resin, quartz or the like. The transparent electrode 12 made of a transparent metal material having a large work function such as
The thickness is about m. On the surface of the transparent electrode 12, a light emitting layer 14 made of an organic EL material is formed with a thickness of about several hundreds of mm. The surface of the light emitting layer 14 has A
Back electrode 1 made of a metal having a large work function such as u or Al
6 is formed to a thickness of about 1000 °.
【００１０】透明電極１２と発光層１４との間及び背面
電極１６と発光層１４との間には、各々所定の間隔で均
等に島状または穴あき状の電子注入層２０が数Å程度の
極薄い層に形成されている。電子注入層２０はＬｉやＭ
ｇ等の仕事関数の小さい金属により形成されている。ま
たこの電子注入層２０はストライプ状や網目状に形成し
ても良く、その厚さは電子注入が可能な厚さであれば良
く、１〜数十Å程度の厚さで適宜設定可能である。Between the transparent electrode 12 and the light-emitting layer 14 and between the back electrode 16 and the light-emitting layer 14, an island-shaped or perforated electron-injecting layer 20 is provided at a predetermined interval, each having a thickness of about several Å. It is formed in an extremely thin layer. The electron injection layer 20 is made of Li or M
It is formed of a metal having a small work function such as g. Further, the electron injection layer 20 may be formed in a stripe shape or a mesh shape, and its thickness may be any thickness as long as it allows electron injection, and can be appropriately set to a thickness of about 1 to several tens of square meters. .
【００１１】有機ＥＬ材料の発光層１４は、ホール輸送
材料と電子輸送材料が混合された混合材料からなる。発
光層１４の母体材料のうちホール輸送材料としては、ト
リフェニルアミン誘導体（ＴＰＤ）、ヒドラゾン誘導
体、アリールアミン誘導体等がある。また、電子輸送材
料としては、緑色発光材料であるアルミキレート錯体
（Ａｌｑ3）、青色発光材料であるジスチリルビフェニ
ル誘導体（ＤＰＶＢｉ）、その他オキサジアゾール誘導
体、ビスチリルアントラセン誘導体、ベンゾオキサゾー
ルチオフェン誘導体、ペリレン類、チアゾール類等を用
いる。さらに長波長発光色変調するためのドーパントと
して、ジシアノメチレン誘導体（ＤＣＭ）や、ナイルレ
ッド（Ｎｉｌｅ Ｒｅｄ）、緑色の発光材料としてクマ
リン５４０（Ｃ５４０）等を適宜添加し、任意の発光色
を得る。またホール輸送材料と電子輸送材料の混合比
は、１０：９０乃至９０：１０の範囲で適宜変更可能で
ある。The light emitting layer 14 made of an organic EL material is made of a mixed material in which a hole transport material and an electron transport material are mixed. The hole transporting material among the base materials of the light emitting layer 14 includes a triphenylamine derivative (TPD), a hydrazone derivative, an arylamine derivative, and the like. Examples of the electron transporting material include an aluminum chelate complex (Alq 3 ) that is a green light emitting material, a distyrylbiphenyl derivative (DPVBi) that is a blue light emitting material, other oxadiazole derivatives, bistyrylanthracene derivatives, benzoxazole thiophene derivatives, Perylenes, thiazoles and the like are used. Further, dicyanomethylene derivative (DCM), Nile Red (Nile Red), and coumarin 540 (C540) as a green light-emitting material are appropriately added as a dopant for modulating long-wavelength emission color to obtain an arbitrary emission color. Further, the mixing ratio of the hole transporting material and the electron transporting material can be appropriately changed within a range of 10:90 to 90:10.
【００１２】この実施形態の有機薄膜ＥＬ素子の製造方
法は、先ず基板１０上に一面にＩＴＯ等による透明電極
１２を通常の真空蒸着やフラッシュ蒸着、スパッタリン
グその他の真空中の薄膜形成技術により形成する。次
に、ＬｉやＭｇ等の電子注入層２０を、上記真空薄膜形
成技術の任意の方法で、マスキングにより島状、穴あき
状、ストライプ状、または網目状等に形成する。次に透
明電極１２及び電子注入層２０の表面に、有機ＥＬ材料
の発光層１４を上記真空薄膜形成技術の任意の方法によ
り形成する。さらに、有機ＥＬ材料の発光層１４の表面
に、ＬｉやＭｇ等の電子注入層２０を、上記真空薄膜形
成技術の任意の方法で、上記と同様にマスキングにより
島状、穴あき状、ストライプ状、または網目状等に形成
する。そして、その表面に、上記真空薄膜形成技術のう
ちの任意の方法により、ＡｕやＡｌ等による背面電極１
６を形成する。In the method of manufacturing an organic thin film EL device according to this embodiment, first, a transparent electrode 12 made of ITO or the like is formed on one surface of a substrate 10 by ordinary vacuum evaporation, flash evaporation, sputtering or other thin film formation technology in vacuum. . Next, the electron injection layer 20 of Li, Mg, or the like is formed into an island shape, a perforated shape, a stripe shape, a mesh shape, or the like by masking by an arbitrary method of the above-described vacuum thin film forming technique. Next, a light emitting layer 14 of an organic EL material is formed on the surfaces of the transparent electrode 12 and the electron injection layer 20 by an arbitrary method of the above-described vacuum thin film forming technique. Further, an electron injection layer 20 of Li, Mg, or the like is formed on the surface of the light emitting layer 14 of the organic EL material by an arbitrary method of the above-mentioned vacuum thin film forming technique by masking in the same manner as described above in an island shape, a hole shape, or a stripe shape. , Or a mesh. Then, the back electrode 1 made of Au, Al, or the like is formed on the surface by any of the above-described vacuum thin film forming techniques.
6 is formed.
【００１３】次に、背面電極１６の表面には、図示しな
い保護層を適宜形成する。保護層は、ＡｌやＡｇ、さら
に樹脂等により背面電極を被覆するものである。Next, a protective layer (not shown) is appropriately formed on the surface of the back electrode 16. The protective layer covers the back electrode with Al, Ag, resin, or the like.
【００１４】ここで蒸着条件は、例えば、真空度が６×
１０-6Ｔｏｒｒで、有機ＥＬ材料の場合５０Å／ｓｅｃ
の蒸着速度で成膜する。フラッシュ蒸着法は、予め所定
の比率で混合した有機ＥＬ材料を、３００〜６００℃好
ましくは、４００〜５００℃に加熱した蒸着源に落下さ
せ、有機ＥＬ材料を一気に蒸発させるものである。ま
た、その有機ＥＬ材料を容器中に収容し、急速にその容
器を加熱し、一気に蒸着させるものでも良い。Here, the deposition conditions are, for example, that the degree of vacuum is 6 ×
10 -6 Torr, 50 有機 / sec for organic EL materials
At a deposition rate of In the flash evaporation method, an organic EL material previously mixed at a predetermined ratio is dropped to an evaporation source heated to 300 to 600 ° C., preferably 400 to 500 ° C., and the organic EL material is evaporated at a stroke. Alternatively, the organic EL material may be housed in a container, and the container may be rapidly heated and vapor-deposited at once.
【００１５】この実施形態の有機ＥＬ素子は、透明電極
１２側を陽極、背面電極１６側を陰極とした順バイアス
電位を印加した場合、図１に示すように、仕事関数の高
いＩＴＯ等の透明電極１２から有機ＥＬ材料の発光層１
４へホール２２の注入が行なわれるとともに、陰極であ
る背面電極１６側では仕事関数の低いＬｉ、Ｍｇ等の電
子注入層２０から電子２４の注入が行なわれる。そし
て、発光層１４中のホール輸送材料及び電子輸送材料及
びその他の発光材料によりＥＬ発光が生じる。また逆
に、透明電極１２側を陰極、背面電極１６側を陽極とし
た逆バイアス電位を印加した場合、図２に示すように、
仕事関数の高いＡｕやＡｌ等の背面電極１６から有機Ｅ
Ｌ材料の発光層１４へホール２２の注入が行なわれると
ともに、陰極となる透明電極１２側では仕事関数の低い
ＬｉやＭｇ等の電子注入層２０から電子２４の注入が行
なわれる。In the organic EL device of this embodiment, when a forward bias potential is applied with the transparent electrode 12 side being the anode and the back electrode 16 side being the cathode, as shown in FIG. Light emitting layer 1 of organic EL material from electrode 12
4 and holes 24, and electrons 24 are injected from the electron injection layer 20 of Li, Mg or the like having a low work function on the back electrode 16 side serving as a cathode. Then, EL light emission is generated by the hole transporting material, the electron transporting material, and other light emitting materials in the light emitting layer 14. Conversely, when a reverse bias potential is applied with the transparent electrode 12 side as the cathode and the back electrode 16 side as the anode, as shown in FIG.
From the back electrode 16 such as Au or Al having a high work function,
The holes 22 are injected into the light emitting layer 14 made of the L material, and the electrons 24 are injected from the electron injection layer 20 such as Li or Mg having a low work function on the transparent electrode 12 side serving as the cathode.
【００１６】この実施形態の有機ＥＬ素子によれば、透
明電極１２と背面電極１６に印加する電位の極性が何れ
であっても有効に発光可能なものであり、電極の極性を
問わない有機ＥＬ素子を能にするものである。According to the organic EL device of this embodiment, light can be emitted effectively regardless of the polarity of the potential applied to the transparent electrode 12 and the back electrode 16, and the organic EL device can be used regardless of the polarity of the electrode. It makes the device capable.
【００１７】次にこの発明の有機ＥＬ素子の第二実施形
態について図３を基にして説明する。ここで上記実施形
態と同様の部材は同一の符号を付して説明を省略する。
この実施形態の有機ＥＬ素子は、発光層１４を積層構造
としたもので、発光層１４の中央にオキサジアゾール誘
導体（ｔＢｕ−ＰＢＤ）や、フェナンロトロリン誘導体
（バソクプロイン）等のホールブロック層２６を形成
し、その一方の側の透明電極１２側には、ＴＰＤ、Ａｌ
ｑ3とＤＣＭの混合層２８を形成し、他方の背面電極側
には、ＴＰＤ、Ａｌｑ3とＣ５４０の混合層２９を形成
する。Next, a second embodiment of the organic EL device of the present invention will be described with reference to FIG. Here, the same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
The organic EL device of this embodiment has a light emitting layer 14 having a laminated structure, and a hole blocking layer 26 such as an oxadiazole derivative (tBu-PBD) or a phenanthrotroline derivative (vasocuproine) is provided in the center of the light emitting layer 14. Is formed, and TPD, Al is provided on one side of the transparent electrode 12 side.
forming a q 3 and the mixed layer 28 of DCM, and the other of the back electrode side, to form a mixed layer 29 of TPD, and Alq 3 C540.
【００１８】この発光層１４では、透明電極１２が陽極
で背面電極１６が陰極の順バイアス時は、透明電極１２
から注入されたホール２２が、混合層２８とホールブロ
ック層２６の界面で浸入が阻止され、混合層２８でその
ＤＣＭによりオレンジ色の発光が得られる。また、透明
電極１２が陰極で背面電極１６が陽極の逆バイアス時
は、背面電極１６から注入されたホール２２が混合層２
９とホールブロック層２６の界面で浸入が阻止され、混
合層２９のＣ５４０から緑色の発光が得られる。In the light emitting layer 14, when the transparent electrode 12 is an anode and the back electrode 16 is a cathode, the transparent electrode 12
Is prevented at the interface between the mixed layer 28 and the hole blocking layer 26, and the mixed layer 28 emits orange light by the DCM. When the transparent electrode 12 is the cathode and the back electrode 16 is the reverse bias of the anode, the hole 22 injected from the back electrode 16 is
Intrusion is prevented at the interface between the hole layer 9 and the hole blocking layer 26, and green light is emitted from C 540 of the mixed layer 29.
【００１９】この実施形態の有機ＥＬ素子によれば、単
一の素子で異なる発光が得られるものであり、有機ＥＬ
素子の小型化やカラーディスプレイとしての用途を開く
ものである。According to the organic EL device of this embodiment, different light emission can be obtained by a single device.
This opens up the use as a color display and miniaturization of elements.
【００２０】なお、この発明の有機ＥＬ素子は、仕事関
数の高い電極間に有機ＥＬ材料の発光層を形成し、その
電極表面に仕事関数の小さい金属の薄い電子注入層を部
分的に形成したものであれば良く、その金属の厚さや材
料や形状、形成方法は問わない。In the organic EL device of the present invention, a light emitting layer of an organic EL material is formed between electrodes having a high work function, and a thin electron injection layer of a metal having a small work function is partially formed on the surface of the electrode. Any material may be used, and the thickness, material, shape, and forming method of the metal are not limited.
【００２１】[0021]
【発明の効果】この発明の有機ＥＬ素子は、透明電極と
背面電極の極性を問わずに使用可能であり、有機ＥＬ素
子の用途を広げるものであり、取り扱いも容易なものと
なる。また、電極の極性を変えることにより異なる発光
を得ることもでき、一つの素子で複数の機能を発揮する
ことができるものである。The organic EL device of the present invention can be used irrespective of the polarity of the transparent electrode and the back electrode, and extends the use of the organic EL device and is easy to handle. Further, different light emission can be obtained by changing the polarity of the electrode, and one element can exhibit a plurality of functions.
【図１】この発明の第一実施形態のＥＬ素子の順バイア
ス時の状態を示す模式的断面図である。FIG. 1 is a schematic sectional view showing a state of an EL element according to a first embodiment of the present invention at the time of forward bias.
【図２】この発明の第一実施形態のＥＬ素子の逆バイア
ス時の状態を示す模式的断面図である。FIG. 2 is a schematic sectional view showing a state of the EL element according to the first embodiment of the present invention at the time of reverse bias.
【図３】この発明の第二実施形態のＥＬ素子を示す断面
図である。FIG. 3 is a sectional view showing an EL device according to a second embodiment of the present invention.
１０ 基板 １２ 透明電極 １４ 発光層 １６ 背面電極 ２０ 電子注入層 ２２ ホール ２４ 電子 DESCRIPTION OF SYMBOLS 10 Substrate 12 Transparent electrode 14 Light emitting layer 16 Back electrode 20 Electron injection layer 22 Hole 24 Electron
Claims (3)
関数の大きい透明電極と、この透明電極に積層されホー
ル輸送材料及び電子輸送材料を含む有機ＥＬ材料の発光
層と、この発光層に積層され仕事関数の大きい電極材料
による背面電極を形成し、上記有機ＥＬ材料の発光層と
透明電極及び背面電極との各積層間に、仕事関数の小さ
い金属からなる電子注入層を、ホールの通過が可能な状
態に形成した有機ＥＬ素子。1. A transparent electrode which is a transparent electrode material and has a large work function on a transparent substrate, a light emitting layer of an organic EL material including a hole transport material and an electron transport material laminated on the transparent electrode, and A back electrode made of an electrode material having a large work function is formed by laminating, and an electron injection layer made of a metal having a small work function is passed between each lamination of the light emitting layer of the organic EL material and the transparent electrode and the back electrode. An organic EL element formed in a state capable of performing.
光層との間に島状、穴あき状、ストライプ状または網目
状に形成されている請求項１記載の有機ＥＬ素子。2. The organic EL device according to claim 1, wherein the electron injection layer is formed between each of the electrodes and the light emitting layer in an island shape, a hole shape, a stripe shape, or a mesh shape.
に形成され、中央にホールブロック層を形成し、その両
側に各々異なる発光材料を含有した発光層を形成した請
求項１または２記載の有機ＥＬ素子。3. The light emitting layer of the organic EL material is formed in a laminated structure, a hole blocking layer is formed in the center, and light emitting layers containing different light emitting materials are formed on both sides of the hole blocking layer. Organic EL device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9069076A JPH10255982A (en) | 1997-03-06 | 1997-03-06 | Organic electroluminescent(el) element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9069076A JPH10255982A (en) | 1997-03-06 | 1997-03-06 | Organic electroluminescent(el) element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10255982A true JPH10255982A (en) | 1998-09-25 |
Family
ID=13392139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9069076A Pending JPH10255982A (en) | 1997-03-06 | 1997-03-06 | Organic electroluminescent(el) element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10255982A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1071144A2 (en) * | 1999-07-23 | 2001-01-24 | Sel Semiconductor Energy Laboratory Co., Ltd. | EL display device and a method of manufacturing the same |
| JP2006005340A (en) * | 2004-05-20 | 2006-01-05 | Semiconductor Energy Lab Co Ltd | Light-emitting device and display apparatus |
| US7368659B2 (en) * | 2002-11-26 | 2008-05-06 | General Electric Company | Electrodes mitigating effects of defects in organic electronic devices |
| JP2011014548A (en) * | 2004-05-20 | 2011-01-20 | Semiconductor Energy Lab Co Ltd | Light-emitting element and display device |
| WO2014010800A1 (en) * | 2012-07-10 | 2014-01-16 | 한국과학기술원 | Method for producing organic light-emitting diode element containing inorganic material layer in which hole is formed |
| WO2016046914A1 (en) * | 2014-09-24 | 2016-03-31 | パイオニア株式会社 | Light emitting device |
-
1997
- 1997-03-06 JP JP9069076A patent/JPH10255982A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1071144A2 (en) * | 1999-07-23 | 2001-01-24 | Sel Semiconductor Energy Laboratory Co., Ltd. | EL display device and a method of manufacturing the same |
| EP1071144A3 (en) * | 1999-07-23 | 2006-04-26 | Sel Semiconductor Energy Laboratory Co., Ltd. | EL display device and a method of manufacturing the same |
| US7456037B2 (en) | 1999-07-23 | 2008-11-25 | Semiconductor Energy Laboratory Co., Ltd. | EL display device and a method of manufacturing the same |
| US7368659B2 (en) * | 2002-11-26 | 2008-05-06 | General Electric Company | Electrodes mitigating effects of defects in organic electronic devices |
| JP2006005340A (en) * | 2004-05-20 | 2006-01-05 | Semiconductor Energy Lab Co Ltd | Light-emitting device and display apparatus |
| JP2011014548A (en) * | 2004-05-20 | 2011-01-20 | Semiconductor Energy Lab Co Ltd | Light-emitting element and display device |
| JP4731996B2 (en) * | 2004-05-20 | 2011-07-27 | 株式会社半導体エネルギー研究所 | Light emitting element and display device |
| US8018152B2 (en) | 2004-05-20 | 2011-09-13 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element including intermediate conductive layer having a hole-injection layer with an island-like structure |
| US8339039B2 (en) | 2004-05-20 | 2012-12-25 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element including intermediate conductive layer having an electron-injection layer with an island-like structure |
| US8643270B2 (en) | 2004-05-20 | 2014-02-04 | Semiconductor Energy Laboratory Co., Inc. | Light-emitting element and display device |
| WO2014010800A1 (en) * | 2012-07-10 | 2014-01-16 | 한국과학기술원 | Method for producing organic light-emitting diode element containing inorganic material layer in which hole is formed |
| WO2016046914A1 (en) * | 2014-09-24 | 2016-03-31 | パイオニア株式会社 | Light emitting device |
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