JP2881212B2 - EL device - Google Patents
EL deviceInfo
- Publication number
- JP2881212B2 JP2881212B2 JP1280133A JP28013389A JP2881212B2 JP 2881212 B2 JP2881212 B2 JP 2881212B2 JP 1280133 A JP1280133 A JP 1280133A JP 28013389 A JP28013389 A JP 28013389A JP 2881212 B2 JP2881212 B2 JP 2881212B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- electroluminescent device
- anode
- light
- 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.)
- Expired - Lifetime
Links
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 150000002894 organic compounds Chemical class 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 19
- 230000005684 electric field Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 230000005525 hole transport Effects 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QENGPZGAWFQWCZ-UHFFFAOYSA-N 3-Methylthiophene Chemical compound CC=1C=CSC=1 QENGPZGAWFQWCZ-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- GOLORTLGFDVFDW-UHFFFAOYSA-N 3-(1h-benzimidazol-2-yl)-7-(diethylamino)chromen-2-one Chemical compound C1=CC=C2NC(C3=CC4=CC=C(C=C4OC3=O)N(CC)CC)=NC2=C1 GOLORTLGFDVFDW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- PJANXHGTPQOBST-VAWYXSNFSA-N Stilbene Natural products C=1C=CC=CC=1/C=C/C1=CC=CC=C1 PJANXHGTPQOBST-VAWYXSNFSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- -1 perylene butadiene Chemical compound 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical compound C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 238000001771 vacuum deposition 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
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/826—Multilayers, e.g. opaque multilayers
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は発光性物質からなる発光層を有し、電界を印
加することにより電界印加エネルギーを直接光エネルギ
ーに変換でき、従来の白熱灯、蛍光灯あるいは発光ダイ
オード等とは異なり大面積の面状発光体の実現を可能に
する電発光素子に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention has a light-emitting layer made of a light-emitting substance, and can directly convert electric field applied energy to light energy by applying an electric field. The present invention relates to an electroluminescent element that enables realization of a large-area planar illuminant unlike a fluorescent lamp or a light emitting diode.
電界発光素子はその発光励起機構の違いから、 （１）発光層内での電子や正孔の局所的な移動により
発光体を励起し、交流電界でのみ発光する真性電界発光
素子と、（２）電極からの電子と正孔の注入とその発光
層内での再結合により発光体を励起し、直流電界で作動
するキャリア注入型電界発光素子の二つに分けられる。
（１）の真性電界発光型の発光素子は一般にZnSにMn、C
u等を添加した無機化合物を発光体とするものである
が、駆動に200V以上の高い交流電界を必要とすること、
製造コストが高いこと、輝度や耐久性も不十分である等
の多くの問題点を有する。Due to the difference in the light emission excitation mechanism, the electroluminescence element has the following two aspects. And (2) a carrier injection type electroluminescent element which excites a luminous body by injecting electrons and holes from an electrode and recombines the electrons and holes in a light emitting layer and operates by a DC electric field.
(1) Intrinsic electroluminescence type light emitting devices are generally Mn and C in ZnS.
An inorganic compound to which u or the like is added is used as the luminous body, but requires a high AC electric field of 200 V or more for driving,
There are many problems such as high manufacturing cost, insufficient brightness and durability.
（２）のキャリア注入型電界発光素子は発光層として
薄膜状有機化合物を用いるようになってから高輝度のも
のが得られるようになった。たとえば、特開昭59−1943
93号公報及び米国特許第4,720,432には緑色発光素子
が、Jpn.Journal of Applied Physics,vol.27,P713−71
5には黄色発光素子が開示されており、これらは通常、1
00V以下の直流電界下で高輝度の発光をする。The carrier-injection type electroluminescent device of (2) has obtained a high-luminance device since a thin-film organic compound was used as a light-emitting layer. For example, Japanese Unexamined Patent Publication No.
No. 93, U.S. Pat.No. 4,720,432 discloses a green light-emitting device, Jpn.Journal of Applied Physics, vol. 27, P713-71.
5 discloses yellow light emitting devices, which are usually 1
Emit high-luminance light under a DC electric field of 00 V or less.
しかし、上記の例を含め、有機物を発光体とするキャ
リア注入型電界発光素子はその研究も浅く、未だその材
料研究やデバイス化への研究が充分になされているとは
言えず、現状では更なる輝度の向上、発光波長のコント
ロール、耐久性の向上など、多くの課題をかかえている
のが実情である。However, the carrier-injection type electroluminescent device using an organic substance as a light emitter, including the above examples, has not been sufficiently studied, and it has not been said that the material research or device development has been sufficiently conducted. Actually, there are many problems such as improvement of luminance, control of emission wavelength, and improvement of durability.
本発明は上記の実情に鑑みてなされたものであり、そ
の目的は、電極の劣化が抑制され、発光性能が長時間に
亘って持続する耐久性に優れた電界発光素子を提供する
ことにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electroluminescent element having excellent durability, in which deterioration of an electrode is suppressed and light emitting performance is maintained for a long time. .
本発明者らは、上記課題を解決するため鋭意検討した
結果、陽極および陰極とこれらの間に挟持された一層ま
たは複数層の有機化合物層より構成される電界発光素子
において、陰極が２層あるいはそれ以上の複数層よりな
る積層電極とすることが上記課題に対し有効であること
を見い出し、本発明を完成するに至った。The present inventors have conducted intensive studies to solve the above problems, and as a result, in an electroluminescent device composed of an anode and a cathode and one or more organic compound layers sandwiched therebetween, the cathode has two layers or It has been found that it is effective for the above-mentioned problem to form a laminated electrode composed of a plurality of layers more than that, and the present invention has been completed.
すなわち、本発明によれば、陽極および陰極と、これ
らの間に挟持された一層または複数層の有機化合物層よ
り構成される電界発光素子において、陰極が２層あるい
はそれ以上の複数層よりなる積層電極であることを特徴
とするキャリア注入型電界発素子が提供される。That is, according to the present invention, in an electroluminescent device including an anode and a cathode and one or more organic compound layers sandwiched between the anode and the cathode, the cathode includes two or more stacked layers of a plurality of layers. There is provided a carrier injection type electric field generating element, which is an electrode.
本発明のキャリア注入型電界発素子の１例を添付図面
に沿って説明する。第１図において、１は基板、２は陽
極、３はホール輸送層、４は発光層、5aは第１陰極及び
5bは第２陰極である。One example of the carrier injection type electric field generating element of the present invention will be described with reference to the accompanying drawings. In FIG. 1, 1 is a substrate, 2 is an anode, 3 is a hole transport layer, 4 is a light emitting layer, 5a is a first cathode and
5b is a second cathode.
従来の電界発光素子は第２図に示されるように陰極５
は単層で構成されていたため、大気中の酸素や水分によ
り変質し、耐久性に劣るものであったが、本発明の電界
発光素子は陰極の構成を少なくとも２層からなる積層陰
極としたことから、陰極の劣化が抑制され、耐久性が向
上し、長期間に亘って発光性能が持続するといった顕著
な作用効果を奏するものである。As shown in FIG.
Was composed of a single layer, so it was deteriorated by oxygen and moisture in the air and had poor durability. However, the electroluminescent device of the present invention was configured such that the cathode was a laminated cathode composed of at least two layers. Therefore, the cathode has a remarkable effect of suppressing deterioration of the cathode, improving durability, and maintaining light emission performance for a long period of time.
陰極材料としては、仕事関数の小さい銀、錫、鉛、マ
グネシウム、カルシウム、マンガン、アルミニウムある
いはこれらの合金等が用いられる。また、第１陰極5aと
第２陰極5bの材料は電荷注入性の向上及び耐久性の向上
の観点等からみて第１陰極5aは第２陰極5bより仕事関数
の小さい材料を用いることが好ましい。具体的には第１
陰極5aの材料としてはマグネシウム、カルシウム等を、
第２陰極5bの材料としては金、アルミニウム等を選定す
ることが好ましい。As the cathode material, silver, tin, lead, magnesium, calcium, manganese, aluminum, an alloy thereof, or the like having a small work function is used. Further, it is preferable that the material of the first cathode 5a and the second cathode 5b be a material having a smaller work function than that of the second cathode 5b from the viewpoints of improving the charge injection property and the durability. Specifically, the first
As the material of the cathode 5a, magnesium, calcium, etc.,
It is preferable to select gold, aluminum, or the like as the material of the second cathode 5b.
陽極２の材料としてはニッケル、金、白金、パラジウ
ムや、これらの合金或いは酸化錫（SnO2）、酸化錫イン
ジウム（ITO）、沃化銅などの仕事関数の大きな金属や
それらの合金、化合物、更にポリ（３−メチルチオフェ
ン）、ポリピロール等の導電性ポリマーなどを用いるこ
とができる。Examples of the material of the anode 2 include nickel, gold, platinum, palladium, alloys thereof, and metals having a large work function such as tin oxide (SnO 2 ), indium tin oxide (ITO), and copper iodide, and alloys and compounds thereof. Further, conductive polymers such as poly (3-methylthiophene) and polypyrrole can be used.
陽極及び陰極として用いる材料のうち少なくとも一方
は、素子の発光波長領域において十分透明であることが
望ましい。具体的には80％以上の光透過率を有すること
が望ましい。It is desirable that at least one of the materials used for the anode and the cathode is sufficiently transparent in the emission wavelength region of the device. Specifically, it is desirable to have a light transmittance of 80% or more.
本発明における電界発光素子の発光層４はアントラセ
ン、ペリレンブタジエン、クマリン、スチルベン、オキ
シノイド錯体等を真空蒸着法、溶液塗布法等により薄膜
化し、陽極及び陰極で狭持することにより構成される。
その、化合物中に添加物として他の物質を複数種添加す
ることができる。また電極からの電荷注入効率を向上さ
せるために、ホール輸送層３を電極との間に別に設ける
ことも可能である。The light emitting layer 4 of the electroluminescent device of the present invention is formed by thinning anthracene, perylene butadiene, coumarin, stilbene, oxinoid complex or the like by a vacuum deposition method, a solution coating method, or the like, and sandwiching the thin film between an anode and a cathode.
A plurality of other substances can be added to the compound as additives. In order to improve the charge injection efficiency from the electrode, the hole transport layer 3 can be separately provided between the electrode and the electrode.
以上の各層は、ガラス等の透明基板上１に順次積層さ
せて素子として構成されるわけであるが、素子の安定性
の向上、特に大気中の水分に対する保護のために、別に
保護層を設けたり、素子全体をセル中に入れ、シリコン
オイル等を封入するようにしても良い。Each of the above layers is formed as an element by sequentially laminating it on a transparent substrate 1 made of glass or the like. However, a separate protective layer is provided for improving the stability of the element, particularly for protecting against moisture in the air. Alternatively, the entire element may be placed in a cell and sealed with silicon oil or the like.
以下、実施例に基いて、本発明をより具体的に説明す
る。Hereinafter, the present invention will be described more specifically based on examples.
実施例１ ガラス基板上に大きさ3mm×3mm、厚さ500Åの酸化錫
インジウム（ITO）による陽極を形成し、その上に、下
記式（Ｉ）で示されるジアミン誘導体を真空蒸着して厚
さ750Åのホール輸送層を形成した。つぎにこのホール
輸送層の上に式（II）で示される８−ヒドロキシキノリ
ンアルミニウム錯体を同じく真空蒸着して厚さ750Åの
発光層を形成した。蒸着時の真空度は１×10-5Torr、基
板温度は室温である。Example 1 An anode made of indium tin oxide (ITO) having a size of 3 mm × 3 mm and a thickness of 500 mm was formed on a glass substrate, and a diamine derivative represented by the following formula (I) was vacuum-deposited on the anode. A 750 mm hole transport layer was formed. Next, an 8-hydroxyquinoline aluminum complex represented by the formula (II) was vacuum-deposited on the hole transport layer to form a 750-mm-thick light-emitting layer. The degree of vacuum during the deposition is 1 × 10 −5 Torr, and the substrate temperature is room temperature.
ついで、発光層上にマグネシウムを同じく真空蒸着し
て約500Åの第１陰極を成膜し、その上にアルミニウム
を真空蒸着して、約1000Åの第２陰極を成膜して第１図
に示すような電界発光素子を作製した。このようにして
得られた素子に外部電源を接続して、電流を流したとこ
ろ陽極側にプラスのバイアス電圧を印加した場合に明瞭
な発光を確認された。またこの電界発光素子は大気中で
作動あるいは保存されても電極等の劣化が特に無く耐久
性に優れたものであった。Next, magnesium was vacuum-deposited on the light-emitting layer to form a first cathode of about 500 °, and aluminum was vacuum-deposited thereon to form a second cathode of about 1000 °, as shown in FIG. Such an electroluminescent device was manufactured. When an external power supply was connected to the device thus obtained and a current was passed, clear light emission was confirmed when a positive bias voltage was applied to the anode side. The electroluminescent device was excellent in durability without any particular deterioration of electrodes and the like even when operated or stored in the atmosphere.
実施例２ 実施例１において、第１陰極としての電極材料をカウ
シウムに代えた以外は実施例１と同様にして電界発光素
子を作製した。このようにして得られた電界発光素子は
実施例１と同様に大気中で作動あるいは保存されていも
電極等の劣化が特に無く耐久性に優れたものであった。 Example 2 An electroluminescent device was produced in the same manner as in Example 1 except that the electrode material used as the first cathode was changed to Causium. The electroluminescent device thus obtained was excellent in durability without any particular deterioration of the electrodes and the like even when operated or stored in the atmosphere as in Example 1.
比較例 陰極をマグネシウムのみで1500Åの厚さで形成した以
外は実施例１と同様にして第２図に示すように素子を作
成した。このようにして得られた素子は陰極が徐々に光
沢を失い鈍色となり、それに伴い発光も弱くなり耐久性
に劣るものであった。Comparative Example A device was prepared as shown in FIG. 2 in the same manner as in Example 1 except that the cathode was formed of magnesium alone with a thickness of 1500 °. In the device thus obtained, the cathode gradually lost its luster and became dull, with the resulting decrease in light emission and poor durability.
本発明のキャリア注入型電界発素子は電極の劣化をが
抑制され、耐久性に優れたものであって、発光性能が長
期間に亘って接続し、またその製作も極めて容易なもの
である。The carrier-injection type electric field generating element of the present invention suppresses the deterioration of the electrode, is excellent in durability, is connected for a long period of time, and is extremely easy to manufacture.
第１図は本発明に係る電界発光素子の模式断面図、第２
図は従来の電界発光素子の模式断面図である。FIG. 1 is a schematic sectional view of an electroluminescent device according to the present invention, and FIG.
The figure is a schematic sectional view of a conventional electroluminescent device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 太田 正文 東京都大田区中馬込１丁目３番６号 株 式会社リコー内 (72)発明者 高橋 俊彦 東京都大田区中馬込１丁目３番６号 株 式会社リコー内 (56)参考文献 特開 昭60−177600（ＪＰ，Ａ) 特開 昭60−81799（ＪＰ，Ａ) 特開 昭53−26173（ＪＰ，Ａ) 特開 昭61−142693（ＪＰ，Ａ) 特開 昭63−295695（ＪＰ，Ａ) 特開 昭60−165771（ＪＰ，Ａ) 実開 平１−107898（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H05B 33/26 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masafumi Ota 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Toshihiko Takahashi 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (56) References JP-A-60-177600 (JP, A) JP-A-60-81799 (JP, A) JP-A-53-26173 (JP, A) JP-A-61-142693 ( JP, A) JP-A-63-295695 (JP, A) JP-A-60-166571 (JP, A) JP-A-1-107898 (JP, U) (58) Fields investigated (Int. Cl. 6 , (DB name) H05B 33/26
Claims (2)
た一層または複数層の有機化合物層より構成される電界
発光素子において、陰極が２層あるいはそれ以上の複数
層よりなる積層電極であることを特徴とするキャリア注
入型電界発光素子。1. An electroluminescent device comprising an anode and a cathode and one or more organic compound layers sandwiched between the anode and the cathode, wherein the cathode is a laminated electrode comprising two or more layers. A carrier-injection type electroluminescent device, comprising:
素としての陰極が陽極に近い側から第１陰極および第２
陰極からなる２層電極であり、第１陰極の仕事関数が第
２陰極のそれより小さいことを特徴とする電界発光素
子。2. A cathode as a component of the electroluminescent device according to claim 1, wherein the first cathode and the second cathode are arranged from the side near the anode.
An electroluminescent device, comprising a two-layer electrode comprising a cathode, wherein the work function of the first cathode is smaller than that of the second cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1280133A JP2881212B2 (en) | 1989-10-27 | 1989-10-27 | EL device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1280133A JP2881212B2 (en) | 1989-10-27 | 1989-10-27 | EL device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03141588A JPH03141588A (en) | 1991-06-17 |
| JP2881212B2 true JP2881212B2 (en) | 1999-04-12 |
Family
ID=17620799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1280133A Expired - Lifetime JP2881212B2 (en) | 1989-10-27 | 1989-10-27 | EL device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2881212B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01262461A (en) * | 1988-03-30 | 1989-10-19 | Cambridge Life Sci Plc | Concentration measuring apparatus |
| JPH05174975A (en) * | 1991-10-16 | 1993-07-13 | Fuji Electric Co Ltd | Organic thin film luminous element |
| JPH05283169A (en) * | 1992-03-31 | 1993-10-29 | Toppan Printing Co Ltd | Organic thin-film el element |
| JP3268819B2 (en) * | 1992-05-19 | 2002-03-25 | 三洋電機株式会社 | Organic electroluminescent device |
| US6143433A (en) * | 1994-09-14 | 2000-11-07 | Mitsui Chemicals, Inc. | Organic electroluminescent device and process for producing the same |
| US5703436A (en) * | 1994-12-13 | 1997-12-30 | The Trustees Of Princeton University | Transparent contacts for organic devices |
| JP3774897B2 (en) * | 1997-06-03 | 2006-05-17 | ソニー株式会社 | Organic electroluminescence device |
| JP2000208255A (en) | 1999-01-13 | 2000-07-28 | Nec Corp | Organic electroluminescent display and manufacture thereof |
| JP3125777B2 (en) | 1999-01-28 | 2001-01-22 | 日本電気株式会社 | Organic electroluminescence device and panel |
| TWM244584U (en) | 2000-01-17 | 2004-09-21 | Semiconductor Energy Lab | Display system and electrical appliance |
| JP4810739B2 (en) * | 2000-03-21 | 2011-11-09 | セイコーエプソン株式会社 | Organic electroluminescence device and method for producing the same |
| JP2003282273A (en) * | 2002-03-20 | 2003-10-03 | Seiko Epson Corp | Display device, its manufacturing method, and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60177600A (en) * | 1984-02-23 | 1985-09-11 | ホ−ヤ株式会社 | Thin film el element and method of producing same |
-
1989
- 1989-10-27 JP JP1280133A patent/JP2881212B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03141588A (en) | 1991-06-17 |
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