JP3236332B2 - Organic electroluminescence device - Google Patents
Organic electroluminescence deviceInfo
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- JP3236332B2 JP3236332B2 JP00682492A JP682492A JP3236332B2 JP 3236332 B2 JP3236332 B2 JP 3236332B2 JP 00682492 A JP00682492 A JP 00682492A JP 682492 A JP682492 A JP 682492A JP 3236332 B2 JP3236332 B2 JP 3236332B2
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- metal
- cathode
- alloy
- organic
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Description
【０００１】[0001]
【技術分野】本発明は有機エレクトロルミネッセンス素
子（以下、有機ＥＬ素子と称する）に関する。TECHNICAL FIELD The present invention relates to an organic electroluminescence device (hereinafter, referred to as an organic EL device).
【０００２】[0002]
【背景技術】有機ＥＬ素子として、図１に示すように、
陰極である金属電極１と陽極である透明電極２との間に
有機化合物からなり互いに積層された発光層としての有
機蛍光体薄膜３と有機正孔輸送層４とが配された２層構
造のものがある。ここで、有機正孔輸送層４は陽極から
正孔を注入され易くする機能と電子をブロックする機能
とを有している。透明電極２の外側にはガラス基板６が
配されており、金属電極１から注入された電子と透明電
極２から注入された正孔との再結合によって励起子が生
じ、この励起子が放射失活する過程で光を放ち、この光
が透明電極２及びガラス基板６を介して外部に放出され
る。BACKGROUND ART As an organic EL device, as shown in FIG.
It has a two-layer structure in which an organic phosphor thin film 3 as a light emitting layer and an organic hole transport layer 4 which are made of an organic compound and are laminated on each other are disposed between a metal electrode 1 as a cathode and a transparent electrode 2 as an anode. There is something. Here, the organic hole transport layer 4 has a function of facilitating injection of holes from the anode and a function of blocking electrons. A glass substrate 6 is disposed outside the transparent electrode 2, and excitons are generated by recombination of electrons injected from the metal electrode 1 and holes injected from the transparent electrode 2, and the excitons are radiated by radiation. Light is emitted in the process of activation, and this light is emitted to the outside via the transparent electrode 2 and the glass substrate 6.
【０００３】ところで、従来の有機ＥＬ素子において
は、電子注入に有効な材料なので陰極の金属電極１とし
て３エレクトロンボルト以下の仕事関数の低い金属材料
（低仕事関数金属という）を用いることが望ましい。し
かし、この低仕事関数金属の陰極はその成膜の容易性、
安定性等に問題が有るので、３エレクトロンボルトを越
える高い仕事関数を有する金属材料（高仕事関数金属と
いう）が、現状としてアルミニウム、マグネシウムやマ
グネシウムインジウム合金、マグネシウムアルミニウム
合金、マグネシウム銀合金等の単独材料または共蒸着さ
れた合金材料が、陰極に用いられている（特開昭第６３
−２９５６９５号公報参照）。In the conventional organic EL device, it is desirable to use a metal material having a low work function of 3 electron volts or less (referred to as a low work function metal) as the metal electrode 1 of the cathode because it is a material effective for electron injection. However, this low work function metal cathode is easy to form,
Due to problems in stability and the like, metal materials having a high work function exceeding 3 electron volts (referred to as high work function metals) are currently used alone as aluminum, magnesium, magnesium indium alloy, magnesium aluminum alloy, magnesium silver alloy, etc. A material or a co-deposited alloy material is used for the cathode (Japanese Patent Application Laid-Open No. 63-63).
-295695).
【０００４】かかる従来の有機ＥＬ素子においては、低
仕事関数金属を第１金属とし、さらに成膜性及び安定性
を有する高仕事関数金属を第２金属として第１及び第２
金属の合金材料を陰極とする場合、両者を共蒸着して形
成される。この合金陰極において、第１金属を主成分と
して第２金属は全体金属の１ないし１０％程度を存在さ
せている。すなわち、合金陰極全体が共蒸着により均一
混合された薄膜となっている。第２金属は、共蒸着にお
ける第１金属の蒸着を補助する役割を果たしている。In such a conventional organic EL device, a first metal is used as a low work function metal and a second metal is used as a high work function metal having film forming property and stability.
When a metal alloy material is used as the cathode, both are formed by co-evaporation. In this alloy cathode, the first metal is the main component and the second metal is present in about 1 to 10% of the whole metal. That is, a thin film is obtained in which the entire alloy cathode is uniformly mixed by co-evaporation. The second metal plays a role in assisting the deposition of the first metal in the co-deposition.
【０００５】しかしながら、従来の合金陰極を有する有
機ＥＬ素子は、低駆動電圧で輝度を高くすることは難し
く、その環境安定性も十分とはいえない。However, it is difficult to increase the luminance of a conventional organic EL device having an alloy cathode at a low driving voltage, and its environmental stability is not sufficient.
【０００６】[0006]
【発明の目的】本発明の目的は、発光効率及び輝度が高
くかつ環境安定性の高い有機ＥＬ素子を提供することで
ある。SUMMARY OF THE INVENTION An object of the present invention is to provide an organic EL device having high luminous efficiency and luminance and high environmental stability.
【０００７】[0007]
【発明の構成】本発明は、陽極と陰極の間に有機化合物
からなる有機層を配する有機エレクトロルミネッセンス
素子であって、前記陰極は、３エレクトロンボルト以下
の仕事関数を有する低仕事関数金属である第１金属及び
前記第１金属を安定化せしめる第２金属からなりかつ前
記有機層及び前記陰極の界面に接する合金領域を有し、
前記第１金属はリチウムであり、前記第２金属がアルミ
ニウムであり、前記合金領域は、前記アルミニウムの１
００重量部に対して前記リチウムの濃度を０．００５〜
０．３重量部好ましくは０．０１重量部以上０．１重量
部以下の重量比で含むことを特徴とする。The present invention relates to an organic compound between an anode and a cathode.
An organic electroluminescence device having an organic layer comprising: a cathode formed of a first metal that is a low work function metal having a work function of 3 electron volts or less and a second metal that stabilizes the first metal. Having an alloy region in contact with the interface between the organic layer and the cathode,
The first metal is lithium, the second metal is aluminum, and the alloy region includes one of the aluminum.
0.005 parts by weight of the lithium
It is characterized by containing 0.3 parts by weight, preferably 0.01 part by weight or more and 0.1 part by weight or less.
【０００８】本発明は、陽極と陰極の間に有機化合物か
らなる有機層を配する有機エレクトロルミネッセンス素
子であって、前記陰極は、３エレクトロンボルト以下の
仕事関数を有する低仕事関数金属である第１金属及び前
記第１金属を安定化せしめる第２金属からなりかつ前記
有機層及び前記陰極の界面に接する合金領域を有し、前
記第１金属はストロンチウムであり、前記第２金属がマ
グネシウムであり、前記合金領域は、前記マグネシウム
の１００重量部に対して前記ストロンチウムの濃度を１
０〜４０重量部好ましくは１０重量部以上２５重量部以
下の重量比で含むことを特徴とする。[0008] The present invention relates to an organic compound between an anode and a cathode.
An organic electroluminescence device having an organic layer comprising: a first metal which is a low work function metal having a work function of 3 electron volts or less and a second metal which stabilizes the first metal. And an alloy region in contact with the interface between the organic layer and the cathode, wherein the first metal is strontium, the second metal is magnesium, and the alloy region is based on 100 parts by weight of magnesium. The strontium concentration is 1
It is characterized in that it is contained in an amount of 0 to 40 parts by weight, preferably 10 to 25 parts by weight.
【０００９】本発明は、陽極と陰極の間に有機層を配す
る有機エレクトロルミネッセンス素子であって、前記陰
極は、３エレクトロンボルト以下の仕事関数を有する低
仕事関数金属である第１金属及び前記第１金属を安定化
せしめる第２金属からなり、前記陰極上に積層された保
護電極を有していることを特徴とする。According to the present invention , an organic layer is disposed between an anode and a cathode.
Organic electroluminescent device, wherein
The pole has a low work function of less than 3 electron volts.
Stabilizing a first metal that is a work function metal and the first metal
Made of a second metal which is laminated on the cathode.
A protective electrode .
【００１０】[0010]
【発明の作用】本発明によれば、環境安定性の高い高輝
度で低電圧駆動の有機ＥＬ素子が得られる。According to the present invention, a high-luminance, low-voltage driven organic EL device having high environmental stability can be obtained.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照しつつ詳
細に説明する。図２に示した本発明による有機ＥＬ素子
においては、合金陰極１１と陽極である透明電極１２と
の間に、有機化合物からなり互いに積層された発光層と
しての有機蛍光体薄膜１３と有機正孔輸送層１４とが配
されている。透明電極２の外側にはガラス基板１６が配
されている。保護電極１７は、仕事関数、成膜性及び安
定性、さらにコストを考慮すると合金陰極１１の組成に
拘らずアルミニウム(Al)またはマグネシウム(Mg)から形
成されることが好ましい。また、第１金属はリチウム(L
i)、ストロンチウム(Sr)等の低仕事関数のアルカリ金属
やアルカリ土類金属であることが好ましい。保護電極１
７の存在によって、合金陰極１１における高仕事関数金
属の第２金属の成分割合を増やすことができる。さら
に、かかる構成によって第２金属の効果として第１金属
を安定化せしめるのに加えて、陰極及び保護電極全体の
シート抵抗を減少させている。Embodiments of the present invention will be described below in detail with reference to the drawings. In the organic EL device according to the present invention shown in FIG. 2, between the alloy cathode 11 and the transparent electrode 12 as an anode, an organic phosphor thin film 13 as a light emitting layer, which is made of an organic compound and is laminated on each other, and an organic hole are formed. A transport layer 14 is provided. A glass substrate 16 is provided outside the transparent electrode 2. The protection electrode 17 is preferably formed of aluminum (Al) or magnesium (Mg) irrespective of the composition of the alloy cathode 11 in consideration of the work function, film formability and stability, and cost. The first metal is lithium (L
It is preferable to use low work function alkali metals or alkaline earth metals such as i) and strontium (Sr). Protection electrode 1
By virtue of the presence of 7, the component ratio of the second metal of the high work function metal in the alloy cathode 11 can be increased. Further, with such a configuration, in addition to stabilizing the first metal as an effect of the second metal, the sheet resistance of the entire cathode and protection electrode is reduced.
【００１２】この合金陰極１１の膜厚は合金陰極１１及
び保護電極１７全体の厚さの２分の１ないし３分の２
で、保護電極１７は薄い膜厚であることが好ましい。な
お合金陰極１１及び保護電極１７全体の厚さは１０００
ないし３０００オングストローム（Å）であることが好
ましい。また、第１金属と第２金属とを共蒸着した合金
陰極１１は、蒸着された合金全体の１０ないし３０wt％
の第１金属成分を含み、残り７０ないし９０wt％が第２
金属である。ここでも、低仕事関数金属を第１金属と
し、さらに成膜性及び安定性を有する高仕事関数金属を
第２金属としている。The thickness of the alloy cathode 11 is one half to two thirds of the total thickness of the alloy cathode 11 and the protection electrode 17.
It is preferable that the protective electrode 17 has a small thickness. The total thickness of the alloy cathode 11 and the protective electrode 17 is 1000
To 3,000 angstroms (Å). In addition, the alloy cathode 11 in which the first metal and the second metal are co-deposited accounts for 10 to 30% by weight of the entire deposited alloy.
Of the first metal component, and the remaining 70 to 90 wt% is the second metal component.
Metal. Also in this case, the first metal is a low work function metal, and the second metal is a high work function metal having film formability and stability.
【００１３】保護電極１７はアルミニウムまたはマグネ
シウムから形成されることが好ましいが、アルミニウム
またはマグネシウムを合金陰極１１の第２金属成分とし
て、この第２金属から蒸着された単層とすることも好ま
しい。これによって、保護電極１７は同一装置で合金陰
極１１から続けて成膜が可能となる。具体的に、実施例
１及び２として表１及び２に示す如き合金陰極及び保護
電極の成膜条件の範囲内でそれぞれ成膜し有機ＥＬ素子
を製造した。The protection electrode 17 is preferably formed of aluminum or magnesium. However, it is also preferable that aluminum or magnesium is used as the second metal component of the alloy cathode 11 to form a single layer deposited from the second metal. Thus, the protective electrode 17 can be formed continuously from the alloy cathode 11 by the same apparatus. More specifically, as Examples 1 and 2, an organic EL device was manufactured by forming a film within the range of the film forming conditions of the alloy cathode and the protective electrode as shown in Tables 1 and 2, respectively.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 図３において、製造された有機ＥＬ素子の駆動電圧に対
する輝度の特性をグラフに示す。図において、実施例１
のリチウムアルミニウム合金陰極及びアルミニウム保護
電極を有する素子の輝度を○にて示し、実施例２のスト
ロンチウムアルミニウム合金陰極及びアルミニウム保護
電極を有する素子の輝度を◎にて示す。なお、図４にお
いて、比較例として作成したアルミニウム単体からなる
陰極のみを有する有機ＥＬ素子の輝度を●にて示す。[Table 2] FIG. 3 is a graph showing a luminance characteristic with respect to a driving voltage of the manufactured organic EL element. Referring to FIG.
The luminance of the element having the lithium aluminum alloy cathode and the aluminum protective electrode of Example 2 is indicated by ○, and the luminance of the element having the strontium aluminum alloy cathode and the aluminum protective electrode of Example 2 is indicated by ◎. In FIG. 4, the luminance of the organic EL element having only the cathode made of aluminum alone prepared as a comparative example is indicated by ●.
【００１６】図４から明らかなように、これら実施例の
有機ＥＬ素子においては、低駆動電圧で高い輝度が得ら
れた。このように、駆動電圧の低下をもたらした。さら
に、他の試験によれば素子の発光中の電圧上昇率を低下
させ、輝度の減衰率をも低下させている。また、合金陰
極中のリチウムまたはストロンチウムが存在しても陰極
の水酸化、酸化は防止される。すなわち、第１金属をリ
チウムとして第２金属をマグネシウムとしてリチウム−
マグネシウムの重量比を変化させて合金陰極を形成し上
記構成の有機ＥＬ素子を種々作成して、乾燥雰囲気中で
２００時間保存する試験を行った。合金陰極のリチウ
ム：マグネシウムの重量比を５０：１０００、９０：１
０００、１００：１０００、１１５：１０００、３０
０：１０００と変化させた場合に、重量比９０：１００
０、１００：１０００、１１５：１０００及び３００：
１０００の合金陰極を有する素子は発光能力を維持して
保存出来なかったが、重量比５０：１０００の合金陰極
を有する素子は保存でき、更に、６００時間も発光能力
の保存が出来た。即ち、第２金属マグネシウムが１００
０重量部に対して第１金属リチウムを５０重量部以下の
重量比であることが好ましい。As is apparent from FIG. 4, in the organic EL devices of these examples, high luminance was obtained at a low driving voltage. Thus, the driving voltage was reduced. Further, according to other tests, the rate of voltage rise during light emission of the element is reduced, and the rate of decay of luminance is also reduced. Also, even if lithium or strontium is present in the alloy cathode, hydroxylation and oxidation of the cathode are prevented. That is, lithium is used as the first metal and lithium as the second metal.
An alloy cathode was formed by changing the weight ratio of magnesium, and various organic EL devices having the above-described structure were prepared, and a test was conducted in which the devices were stored in a dry atmosphere for 200 hours. The lithium: magnesium weight ratio of the alloy cathode is 50: 1000, 90: 1.
000, 100: 1000, 115: 1000, 30
When the ratio is changed to 0: 1000, the weight ratio is 90: 100.
0, 100: 1000, 115: 1000 and 300:
The device having the 1000 alloy cathode could not be preserved while maintaining the luminous ability, but the device having the 50: 1000 alloy cathode by weight ratio could be preserved, and the luminous ability could be preserved for 600 hours. That is, the second metal magnesium is 100
It is preferable that the weight ratio of the first metal lithium is 50 parts by weight or less with respect to 0 parts by weight.
【００１７】同様に、第１金属をストロンチウムとして
第２金属をマグネシウムとしてストロンチウム−マグネ
シウムの重量比を変化させて合金陰極を形成し上記構成
の有機ＥＬ素子を種々作成して、乾燥雰囲気中で２００
時間保存する試験を行った。合金陰極のストロンチウ
ム：マグネシウムの重量比を４００：１０００、５０
０：１０００、６００：１０００と変化させた場合に、
重量比５００：１０００及び６００：１０００の合金陰
極を有する素子は発光能力を維持して保存出来なかった
が、重量比４００：１０００の合金陰極を有する素子は
保存できた。即ち、第２金属マグネシウムが１０００重
量部に対して第１金属ストロンチウムを４００重量部以
下の重量比であることが好ましい。Similarly, an alloy cathode is formed by changing the weight ratio of strontium-magnesium with strontium as the first metal and magnesium as the second metal, and various organic EL devices having the above structure are prepared.
A time-saving test was performed. The strontium: magnesium weight ratio of the alloy cathode is 400: 1000,50.
When changing to 0: 1000 and 600: 1000,
The devices having the alloy cathodes with the weight ratios of 500: 1000 and 600: 1000 could not be preserved while maintaining the luminous ability, but the devices having the alloy cathodes with the weight ratio of 400: 1000 could be preserved. That is, it is preferable that the weight ratio of the first metal strontium is 400 parts by weight or less with respect to 1000 parts by weight of the second metal magnesium.
【００１８】他の実施例３として図４に示すように、Ａ
ｌ−Ｌｉ合金領域Ａを有する電極１と、インジウムスズ
酸化物（ＩＴＯ）からなる陽極透明電極２と、これらの
間に有機化合物からなり互いに積層されたトリス（８−
キノリノール）アルミニウム（Ａｌｑ３）からなる有機
蛍光体薄膜３及びＮ，Ｎ′−ジフェニル−Ｎ，Ｎ′−ビ
ス（３メチルフェニル）−１，１′−ビフェニル−４，
４′−ジアミン（ＴＰＤ）からなる有機正孔輸送層４と
をガラス基板６上に積層して構成された、保護電極を設
けない２層構造のＥＬ素子を製造した。この素子のＡｌ
−Ｌｉ陰極薄膜中のＬｉ濃度に関しては、陰極膜と有機
層との界面からの陰極膜の厚さ０Åを越え１５００Å以
下の合金領域Ａ範囲内に含まれるＬｉの濃度を０．００
５ｗｔ％以上０．３ｗｔ％以下という微小な量に制御す
る。なお、Ｌｉの濃度をこの合金領域内に収めるために
は、共蒸着法ではなく、あらかじめ適当な組成比でＡｌ
−Ｌｉの合金母材を作っておき、これを一源の抵抗加熱
蒸着あるいは電子ビーム法にて形成することが望まし
い。As another embodiment 3, as shown in FIG.
An electrode 1 having an l-Li alloy region A, an anode transparent electrode 2 made of indium tin oxide (ITO), and a tris (8-
Organic phosphor thin film 3 made of (quinolinol) aluminum (Alq3) and N, N'-diphenyl-N, N'-bis (3-methylphenyl) -1,1'-biphenyl-4,
An organic EL element having a two-layer structure without a protective electrode, which was formed by laminating an organic hole transport layer 4 made of 4'-diamine (TPD) on a glass substrate 6, was manufactured. Al of this element
-Regarding the Li concentration in the Li cathode thin film, the thickness of the cathode film from the interface between the cathode film and the organic layer, which is more than 0 ° and not more than 1500 ° and the Li concentration contained in the alloy region A is 0.00
It is controlled to a minute amount of 5 wt% or more and 0.3 wt% or less. In order to keep the concentration of Li within this alloy region, the co-evaporation method is not used, but the Al
It is desirable to prepare an alloy base material of -Li and form it by resistance heating evaporation of one source or an electron beam method.
【００１９】この実施例によれば、Ａｌ-Ｌｉ陰極薄膜
中のＬｉ濃度の範囲を厳しく制御することにより、素子
作成の安定性が増すと共に、更に高輝度、高効率な発光
特性が得られる。また、Ｌｉ濃度を微量化にすることか
ら環境安定性、成膜性に優れたＥＬ素子が提供できる。
更に、合金陰極膜の作製をＡｌとＬｉとを別々の蒸発源
から同時に飛ばす共蒸着ではなく、あらかじめ適当な組
成比でＡｌ-Ｌｉ合金母材を作っておき、これを蒸発材
料とすれば、膜作製時の制御が容易になり、安定した素
子を供給し易い、材料の保管、材料の蒸着ボートへの供
給が容易になる、というメリットがある。また、合金陰
極膜中の膜厚方向へのＬｉ濃度の勾配をつけることが容
易にできる。例えば、Ｌｉ濃度を陰極膜と有機ＥＬ層と
の界面へ向けて漸次高くする又は低くすることができ
る。これによって一つの蒸着源からＡｌ-Ｌｉ陰極膜の
作製及び保護膜の作製を連続して行なうことも可能とな
る。According to this embodiment, by strictly controlling the range of the Li concentration in the Al-Li cathode thin film, the stability of device fabrication is increased, and furthermore, high-luminance and high-efficiency light-emitting characteristics can be obtained. Further, since the Li concentration is reduced to a small amount, an EL element having excellent environmental stability and film forming properties can be provided.
Further, instead of co-evaporation of simultaneously manufacturing Al and Li from separate evaporation sources to produce an alloy cathode film, if an Al-Li alloy base material is prepared in advance with an appropriate composition ratio and this is used as an evaporation material, There are advantages in that control during film formation is facilitated, stable elements can be easily supplied, materials can be easily stored, and materials can be easily supplied to a deposition boat. Further, it is possible to easily give a gradient of the Li concentration in the thickness direction of the alloy cathode film. For example, the Li concentration can be gradually increased or decreased toward the interface between the cathode film and the organic EL layer. This makes it possible to continuously produce an Al-Li cathode film and a protective film from one evaporation source.
【００２０】具体的に図１に示す保護電極を設けない２
層構造のＥＬ素子を製造した。なお、Ａｌ-Ｌｉ合金領
域電極１を1500Å(即ち、Ａｌ-Ｌｉ合金領域のみからな
る電極１)、Alq3薄膜３を550Å、及びTPD層４を700Åの
膜厚にてそれぞれ積層した。表３に、かかるＥＬ素子に
おけるＡｌ-Ｌｉ陰極のＬｉ濃度を0.024wt％，0.58wt
％，5.6wt％にした時及び純Ａｌ陰極の時の300cd/m2発
光時の発光効率を示す。また、表４に、ＥＬ素子におけ
る合金領域のＬｉ濃度を０．０２４wt%，０．０４８wt
%，０．０６５wt%にしたときの３００ｃｄ／ｍ2発光時
の発光効率を示す。More specifically, FIG.
An EL device having a layer structure was manufactured. The Al-Li alloy region electrode 1 was laminated to a thickness of 1500 Å (that is, the electrode 1 composed of only the Al-Li alloy region), the Alq 3 thin film 3 was laminated to a thickness of 550 Å, and the TPD layer 4 was laminated to a thickness of 700 そ れ ぞ れ. Table 3 shows that the Li concentration of the Al—Li cathode in the EL device was 0.024 wt% and 0.58 wt%.
%, 5.6 wt%, and luminous efficiency at 300 cd / m 2 when using a pure Al cathode. Table 4 shows that the concentration of Li in the alloy region in the EL element was 0.024 wt% and 0.048 wt%.
%, And 0.065 wt% when the emission efficiency is 300 cd / m 2 .
【００２１】図５に、かかるＥＬ素子における合金領域
のＬｉ濃度０wt%（純Ａｌ），０．００７wt%，０．０１
６wt%，０．０２４wt%，０．０４８wt%，０．０６５wt
%，０．０８wt%，０．２wt%，０．５８wt%，及び５．６
wt%に対応する３００ｃｄ／ｍ2発光時の発光効率をプロ
ットしたグラフを示す。FIG. 5 shows a Li concentration of 0 wt% (pure Al), 0.007 wt%, 0.01
6wt%, 0.024wt%, 0.048wt%, 0.065wt
%, 0.08 wt%, 0.2 wt%, 0.58 wt%, and 5.6
4 shows a graph in which luminous efficiency at 300 cd / m 2 emission corresponding to wt% is plotted.
【００２２】[0022]
【表３】 [Table 3]
【００２３】[0023]
【表４】 表３及び４並びに図５から明らかなように、輝度３００
ｃｄ／ｍ ２ の時に１．５（１ｍ／Ｗ）以上と高い効率が
得られるのは、Ｌｉ濃度が０．００５〜０．３ｗｔ％好
ましくは０．０１ｗｔ％以上０．１ｗｔ％以下の範囲内
であり、また０．０２４ｗｔ％の時に最大の発光効率が
得られ、表４並びに図５から明らかなように、この範囲
内で陰極を形成すればＥＬ素子の特性上非常にばらつき
の小さい安定した素子が得られることがわかる。[Table 4] Table 3 and 4 and as is clear from FIG. 5, the luminance 300
High efficiency of 1.5 (1 m / W) or more at cd / m 2
What is obtained is that the Li concentration is preferably 0.005 to 0.3 wt%.
Mashiku the Ri der within the following 0.1 wt% or more 0.01 wt%, and the maximum luminous efficiency is obtained when the 0.024Wt%, as is clear from Table 4 and FIG. 5, in the range It can be seen that the formation of the cathode makes it possible to obtain a stable element with a very small variation in the characteristics of the EL element.
【００２４】図６において、ＥＬ素子のＡｌ−Ｌｉ陰極
のＬｉ濃度を０．０１ｗｔ％以上０．１ｗｔ％以下の範
囲，０．００７ｗｔ％，０．５８ｗｔ％，５．６ｗｔ％
にした時及び純Ａｌ陰極の時の輝度（ｃｄ／ｍ２）に対
する発光効率（１ｍ／Ｗ）をグラフに示す。図から明ら
かなように、これら実施例の電極の合金領域内のＬｉ濃
度が０．００５ｗｔ％以上０．３ｗｔ％以下の範囲内で
ある有機ＥＬ素子においては、高い発光効率が得られ
た。In FIG. 6, the Li concentration of the Al—Li cathode of the EL element is in the range of 0.01 wt% to 0.1 wt%, 0.007 wt%, 0.58 wt%, and 5.6 wt%.
The luminous efficiency (1 m / W) with respect to the luminance (cd / m 2) in the case of using a pure Al cathode is shown in the graph. As is clear from the figures, high luminous efficiency was obtained in the organic EL devices in which the Li concentration in the alloy region of the electrodes of these examples was in the range of 0.005 wt% or more and 0.3 wt% or less. .
【００２５】更に図７において、ＥＬ素子のＡｌ−Ｌｉ
陰極のＬｉ濃度を０．０６５ｗｔ％，０．４８ｗｔ％，
５．６ｗｔ％にした時及び純Ａｌ陰極の時における、そ
れぞれの輝度の経時変化により劣化する割合（輝度割
合）をグラフに示す。図から明らかなように、これら実
施例の電極の合金領域内のＬｉ濃度が０．００５〜０．
３ｗｔ％好ましくは０．０１ｗｔ％以上０．１ｗｔ％以
下の範囲内のＬｉ濃度０．０６５ｗｔ％である有機ＥＬ
素子においては、経時変化による輝度劣化が少なく長寿
命化された。Further, in FIG. 7, the Al-Li
The Li concentration of the cathode was 0.065 wt%, 0.48 wt%,
The graphs show the ratios (luminance ratios) of the deterioration with the lapse of time of the respective luminances when 5.6 wt% and the pure Al cathode are used. As is clear from the figures, the Li concentration in the alloy region of the electrodes of these examples was 0.005 to 0.5.
Organic EL having a Li concentration of 0.065 wt% in a range of 3 wt%, preferably 0.01 wt% or more and 0.1 wt% or less.
In the device, the life was prolonged with less luminance deterioration due to aging.
【００２６】一方、他の実施例４としては、図４に示す
合金領域Ａを有する陰極を有する有機ＥＬ素子と同様
に、Ａｌ−Ｌｉに代えて合金領域Ａの組成をＭｇ−Ｓｒ
とした電極１と、ＩＴＯからなる陽極透明電極２と、こ
れらの間にＡｌｑ３からなる有機蛍光体薄膜３及びＴＰ
Ｄからなる有機正孔輸送層４とから構成された、保護電
極を設けない２層構造のＥＬ素子を製造した。この素子
のＭｇ−Ｓｒ陰極薄膜中のＳｒ濃度に関しては、陰極膜
と有機層との界面からの陰極膜の厚さ０Åを越え１５０
０Å以下の合金領域Ａ範囲内に含まれるＳｒの濃度を１
０ｗｔ％以上４０ｗｔ％以下という量に制御する。な
お、Ｓｒの濃度をこの合金領域内に収めるためには、共
蒸着法ではなく、あらかじめ適当な組成比でＭｇ−Ｓｒ
の合金母材を作っておき、これを一源の抵抗加熱蒸着あ
るいは電子ビーム法にて形成することが望ましい。On the other hand, in another embodiment 4, similarly to the organic EL device having the cathode having the alloy region A shown in FIG. 4, the composition of the alloy region A is changed to Mg-Sr instead of Al-Li.
Electrode 1, an anode transparent electrode 2 made of ITO, an organic phosphor thin film 3 made of Alq3 and TP
Thus, an EL device having a two-layer structure without the protective electrode and comprising the organic hole transport layer 4 made of D was manufactured. Regarding the Sr concentration in the Mg—Sr cathode thin film of this device, the thickness of the cathode film from the interface between the cathode film and the organic layer exceeds 0 ° and the thickness exceeds 150 °.
The concentration of Sr contained in the alloy region A of 0 ° or less is 1
The amount is controlled to be 0 wt% or more and 40 wt% or less. In order to keep the concentration of Sr within this alloy region, it is not necessary to use a co-evaporation method, but to use Mg—Sr
It is preferable to prepare an alloy base material and form it by a single source resistance heating evaporation or an electron beam method.
【００２７】この実施例によれば、Ｍｇ-Ｓｒ陰極薄膜
中のＳｒ濃度の範囲を厳しく制御することにより、素子
作成の安定性が増すと共に、更に高輝度高効率な発光特
性が得られる。また、環境安定性、成膜性に優れたＥＬ
素子が提供できる。更に、合金陰極膜の作製をＭｇとＳ
ｒを別々の蒸発源から同時に飛ばす共蒸着ではなく、あ
らかじめ適当な組成比でＭｇ-Ｓｒ合金母材を作ってお
き、これを蒸発材料とすれば、膜作製時の制御が容易に
なり、安定した素子を供給し易い、材料の保管、材料の
蒸着ボートへの供給が容易になる、というメリットがあ
る。According to this embodiment, by strictly controlling the range of the Sr concentration in the Mg—Sr cathode thin film, the stability of the device fabrication is increased, and the light emission characteristics with higher luminance and higher efficiency are obtained. EL with excellent environmental stability and film forming properties
An element can be provided. Further, the production of the alloy cathode film was performed using Mg and S
Rather than co-evaporation in which r is simultaneously emitted from different evaporation sources, if a Mg-Sr alloy base material is prepared in advance with an appropriate composition ratio and this is used as the evaporation material, control during film formation becomes easy and stable. There are advantages in that the element can be easily supplied, that the material can be stored and that the material can be easily supplied to the evaporation boat.
【００２８】また、合金陰極膜中の膜厚方向へのＳｒ濃
度の勾配をつけることが容易にできる。例えば、Ｓｒ濃
度を陰極膜と有機ＥＬ層との界面へ向けて漸次高くする
又は低くすることができる。これによって一つの蒸着源
からＭｇ-Ｓｒ陰極膜の作製及び保護膜の作製を連続し
て行なうことも可能となる。具体的に図1に示す保護電
極を設けない２層構造のＥＬ素子を製造した。なお、Ｍ
ｇ-Ｓｒ合金領域電極１を1500Å(即ち、Ｍｇ-Ｓｒ合金
領域のみからなる電極１)、Alq3薄膜３を550Å、及びTP
D層４を700Åの膜厚にてそれぞれ積層した。表５に、こ
の時のＭｇ-Ｓｒ陰極のＳｒ濃度を20.5wt％，35.6wt％
にした時の300cd/m2発光時の効率を示す。また表６に、
Ｓｒ濃度を9.37wt％，20.5wt％，26.8wt％にした時の30
0cd/m2発光時の効率を示す。Further, it is possible to easily provide a gradient of the Sr concentration in the thickness direction of the alloy cathode film. For example, the Sr concentration can be gradually increased or decreased toward the interface between the cathode film and the organic EL layer. This makes it possible to continuously produce the Mg—Sr cathode film and the protective film from one evaporation source. Specifically, an EL device having a two-layer structure without the protective electrode shown in FIG. 1 was manufactured. Note that M
The g-Sr alloy region electrode 1 was 1500 ° (that is, the electrode 1 consisting of only the Mg—Sr alloy region), the Alq 3 thin film 3 was 550 °, and TP
D layer 4 was laminated in a thickness of 700 °. Table 5 shows the Sr concentration of the Mg—Sr cathode at this time as 20.5 wt% and 35.6 wt%.
The efficiency at the time of light emission of 300 cd / m 2 is shown. In Table 6,
When the Sr concentration was 9.37 wt%, 20.5 wt%, 26.8 wt%
The efficiency at the time of light emission of 0 cd / m 2 is shown.
【００２９】図８に、かかるＥＬ素子における合金領域
のＳｒ濃度３．０wt%，９．３７wt%，１４．０wt%，２
０．５wt%，２６．８wt%，３５．６wt%，及び４１．０w
t%に対応する３００ｃｄ／ｍ2発光時の発光効率をプロ
ットしたグラフを示す。FIG. 8 shows an Sr concentration of 3.0% by weight, 9.37% by weight, 14.0% by weight, 2% by weight in the alloy region in the EL device.
0.5 wt%, 26.8 wt%, 35.6 wt%, and 41.0 w
5 is a graph plotting luminous efficiency at the time of light emission of 300 cd / m 2 corresponding to t%.
【００３０】[0030]
【表５】 [Table 5]
【００３１】[0031]
【表６】 表５及び６並びに図８から明らかなように、輝度３００
ｃｄ／ｍ ２ の時に１．５（１ｍ／Ｗ）以上と高い効率が
得られるのは、Ｍｇ−Ｓｒ陰極膜中のＳｒ濃度が１０〜
４０ｗｔ％好ましくは１０ｗｔ％以上２５ｗｔ％以下の
範囲にある場合であり、この中で発光効率が最大にして
かつＥＬ素子特性上非常にばらつきの小さい安定な特性
を有するＥＬ素子を得ることができることがわかる。[Table 6] Table 5 and 6 and as is clear from FIG. 8, intensity 300
High efficiency of 1.5 (1 m / W) or more at cd / m 2
What is obtained is that the Sr concentration in the Mg—Sr cathode film is 10 to 10.
This is the case where it is in the range of 40 wt%, preferably 10 wt% or more and 25 wt% or less . In this case, it is possible to obtain an EL device having a maximum luminous efficiency and having stable characteristics with very little variation in EL device characteristics. Understand.
【００３２】図９において、ＥＬ素子のＭｇ-Ｓｒ陰極
のＳｒ濃度を10wt％以上25wt％以下の範囲，3wt％，36w
t%，63wt％にした時の輝度(cd/m2)に対する発光効率(lm
/W)をグラフに示す。図から明らかなように、これら実
施例の電極の合金領域内のＳｒ濃度が１０wt％以上２５
wt％以下の範囲内である有機ＥＬ素子においては、高い
発光効率が得られた。In FIG. 9, the Sr concentration of the Mg—Sr cathode of the EL element is in the range of 10% to 25% by weight, 3% by weight, and 36% by weight.
Luminous efficiency (lm) for luminance (cd / m 2 ) when t% and 63 wt%
/ W) is shown in the graph. As is apparent from the figure, the Sr concentration in the alloy region of the electrodes of these examples is 10 wt% or more and 25 wt% or more.
High luminous efficiency was obtained in the organic EL device within the range of wt% or less.
【００３３】更に図１０において、ＥＬ素子のＭｇ−Ｓ
ｒ陰極のＳｒ濃度を１３．９ｗｔ％，１７．８ｗｔ％，
２４．８ｗｔ％，及び３３．２ｗｔ％にした時におけ
る、それぞれの輝度の経時変化により劣化する割合（輝
度割合）をグラフに示す。図から明らかなように、これ
ら実施例の電極の合金領域内のＳｒ濃度が１０〜４０ｗ
ｔ％好ましくは１０ｗｔ％以上２５ｗｔ％以下の範囲内
の有機ＥＬ素子においては、経時変化による輝度劣化が
少なく長寿命化された。Further, in FIG. 10, the Mg-S
The Sr concentration of the r cathode was 13.9 wt%, 17.8 wt%,
The graphs show the ratios (luminance ratios) of deterioration due to the temporal change of the respective luminances at 24.8 wt% and 33.2 wt%. As is clear from the figure, the Sr concentration in the alloy region of the electrodes of these examples is 10 to 40 watts.
In the organic EL element in the range of t%, preferably in the range of 10 wt% or more and 25 wt% or less, there was little luminance deterioration due to aging and the life was extended.
【００３４】Ｓｒ濃度から４０ｗｔ％以上になるとＳｒ
濃度の増加に従い発光効率は低下し、環境安定性も急激
に悪くなる。また、Ｓｒ濃度が１０ｗｔ％以下になると
Ｍｇの成膜性の悪さを改善することが困難となり、安定
したＥＬ素子を提供することができない。上記した本発
明の実施例においては、製造中の有機ＥＬ素子の保存す
るために、素子の周囲を密閉してにアルゴン、窒素等の
不活性ガスを封止して行うか、または、大気をともに封
止する場合は素子の近傍に素子から遮断して五酸化二燐
を存在させて封入する。When the Sr concentration exceeds 40 wt%, Sr
As the concentration increases, the luminous efficiency decreases and the environmental stability rapidly deteriorates. Further, when the Sr concentration is less than 10 wt%, it is difficult to improve the poor film formability of Mg, and a stable EL element cannot be provided. In the above-described embodiment of the present invention, in order to preserve the organic EL element during manufacture, the periphery of the element is sealed and sealed with an inert gas such as argon or nitrogen, or the atmosphere is evacuated. When both are sealed, they are cut off from the element in the vicinity of the element, and diphosphorus pentoxide is present and sealed.
【００３５】なお、上記した本発明の実施例において
は、２層構造の有機ＥＬ素子について説明したが、本発
明はこれに限らない。本発明は、有機層として有機蛍光
体薄膜及び有機正孔輸送層の他に、合金陰極から電子を
注入させ易くするために有機蛍光体薄膜及び陰極間に有
機電子輸送層を備えた３層構造のものにも適用すること
ができる。In the above-described embodiment of the present invention, the organic EL device having a two-layer structure has been described, but the present invention is not limited to this. The present invention provides a three-layer structure including an organic phosphor thin film and an organic hole transport layer as an organic layer, and an organic electron transport layer between the organic phosphor thin film and the cathode to facilitate injection of electrons from the alloy cathode. Can also be applied to
【００３６】[0036]
【発明の効果】以上の如く、本発明によれば、第１金属
Ｌｉ及び安定化第２金属Ａｌからなる合金陰極と有機層
との界面からの所定膜厚（０Å以上１５００Å以下）の
合金領域内に含まれる第１金属Ｌｉの濃度を０．０１ｗ
ｔ％以上０．１ｗｔ％以下という微小な量に制御するの
で、輝度３００ｃｄ／ｍ ２ の時の発光効率が１．５（１
ｍ／Ｗ）以上と発光効率及び輝度が高くかつ素子の製造
上バラツキを抑えることのできる環境安定性の高い有機
ＥＬ素子が得られる。また、本発明によれば、第１金属
Ｓｒ及び安定化第２金属Ｍｇからなる合金陰極と有機層
との界面からの所定膜厚（０Åを越え１５００Å以下）
の合金領域内に含まれる第１金属Ｓｒの濃度を１０ｗｔ
％以上４０ｗｔ％以下という微小な量に制御するので、
発光効率及び輝度が高くかつ環境安定性の高い有機ＥＬ
素子が得られる。As described above, according to the present invention, the first metal
The concentration of the first metal Li contained in the alloy region of a predetermined film thickness (0 ° or more and 1500 ° or less) from the interface between the alloy cathode composed of Li and the stabilized second metal Al and the organic layer is 0.01 w
Since it is controlled to a very small amount of not less than t% and not more than 0.1 wt% , the luminous efficiency at a luminance of 300 cd / m 2 is 1.5 (1
m / W) or more and high luminous efficiency and luminance, and manufacture of devices
An organic EL element having high environmental stability and capable of suppressing the above variation can be obtained. Also, according to the present invention, the first metal
A predetermined thickness from the interface between the organic cathode and the alloy cathode composed of Sr and the stabilized second metal Mg (more than 0 ° and 1500 ° or less)
The concentration of the first metal Sr contained in the alloy region of
% To 40 wt% or less.
Organic EL with high luminous efficiency, high brightness and high environmental stability
An element is obtained.
【００３７】更に、本発明の有機ＥＬ素子においては、
基板上に積層された透明陽極、正孔輸送層、発光層、並
びに第１金属及び第２金属からなる合金陰極からなる素
子において、保護電極を合金陰極上に積層しているの
で、低駆動電圧で輝度を高くすることが出来、さらに合
金陰極を完全に被覆することにより環境安定性を高くす
ることができる。Further, in the organic EL device of the present invention,
In a device composed of a transparent anode, a hole transport layer, a light emitting layer, and an alloy cathode composed of a first metal and a second metal laminated on a substrate, the protective electrode is laminated on the alloy cathode. In this case, the brightness can be increased, and the environmental stability can be enhanced by completely covering the alloy cathode.
【図１】有機ＥＬ素子を示す構造図である。FIG. 1 is a structural diagram showing an organic EL element.
【図２】実施例１及び２の有機ＥＬ素子を示す構造図で
ある。FIG. 2 is a structural diagram showing the organic EL elements of Examples 1 and 2.
【図３】実施例１及び２並びに比較例の有機ＥＬ素子の
輝度駆動電圧特性を示すグラフである。FIG. 3 is a graph showing luminance driving voltage characteristics of the organic EL elements of Examples 1 and 2 and Comparative Example.
【図４】実施例３及び４の有機ＥＬ素子を示す構造図で
ある。FIG. 4 is a structural diagram showing the organic EL elements of Examples 3 and 4.
【図５】実施例３の合金領域のＬｉ濃度に対する発光効
率特性を示すグラフである。FIG. 5 is a graph showing luminous efficiency characteristics with respect to Li concentration in an alloy region of Example 3.
【図６】実施例３の輝度に対する発光効率特性を示すグ
ラフである。FIG. 6 is a graph showing luminous efficiency characteristics with respect to luminance in Example 3.
【図７】実施例３のＥＬ素子の輝度の経時変化を示すグ
ラフである。FIG. 7 is a graph showing a change over time in luminance of the EL element of Example 3.
【図８】実施例４の合金領域のＳｒ濃度に対する発光効
率特性を示すグラフである。FIG. 8 is a graph showing luminous efficiency characteristics with respect to Sr concentration in an alloy region of Example 4.
【図９】実施例４の輝度に対する発光効率特性を示すグ
ラフである。FIG. 9 is a graph showing luminous efficiency characteristics with respect to luminance in Example 4.
【図１０】実施例３のＥＬ素子の輝度の経時変化を示す
グラフである。FIG. 10 is a graph showing a change over time in luminance of the EL element of Example 3.
１ 陰極 ２ 透明電極 ３ 有機蛍光体薄膜 ４ 有機正孔輸送層 ６ ガラス基板 １１ 合金陰極 １２ 透明電極 １３ 有機蛍光体薄膜 １４ 有機正孔輸送層 １６ ガラス基板 １７ 保護電極 Ａ 合金領域 Reference Signs List 1 cathode 2 transparent electrode 3 organic phosphor thin film 4 organic hole transport layer 6 glass substrate 11 alloy cathode 12 transparent electrode 13 organic phosphor thin film 14 organic hole transport layer 16 glass substrate 17 protective electrode A alloy region
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永山 健一 埼玉県鶴ヶ島市富士見６丁目１番１号パ イオニア株式会社 総合研究所内 (72)発明者 渡辺 輝一 埼玉県鶴ヶ島市富士見６丁目１番１号パ イオニア株式会社 総合研究所内 (56)参考文献 特開 昭60−165771（ＪＰ，Ａ) 特開 平２−139893（ＪＰ，Ａ) 特開 平２−15595（ＪＰ，Ａ) 特開 平４−212287（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H05B 33/00 - 33/28 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kenichi Nagayama 6-11, Fujimi, Tsurugashima-shi, Saitama Prefecture Pioneer Corporation (72) Inventor Teruichi Watanabe 6-1-1, Fujimi, Tsurugashima-shi, Saitama (56) References JP-A-60-166571 (JP, A) JP-A-2-139893 (JP, A) JP-A-2-15595 (JP, A) JP-A-4 −212287 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H05B 33/00-33/28
Claims (11)
機層を配する有機エレクトロネミネッセンス素子であっ
て、前記陰極は、３エレクトロンボルト以下の仕事関数
を有する低仕事関数金属である第１金属及び前記第１金
属を安定化せしめる第２金属からなりかつ前記有機層及
び前記陰極の界面に接する合金領域を有し、前記第１金
属はリチウムであり、前記第２金属がアルミニウムであ
り、前記合金領域は、前記アルミニウムの１００重量部
に対して前記リチウムの濃度を０．００５重量部以上
０．３重量部以下の重量比で含みかつ、前記有機層及び
前記陰極の界面から１５００Å以下の厚さ範囲に存在す
ること、並びに前記合金陰極上に積層された保護電極を
有し、前記合金陰極の膜厚は前記合金陰極及び前記保護
電極全体の厚さの２分の１ないし３分の２であることを
特徴とする有機エレクトロルミネッセンス素子。1. An organic electroluminescence device having an organic layer made of an organic compound disposed between an anode and a cathode, wherein the cathode is a low work function metal having a work function of 3 electron volts or less. An alloy region made of one metal and a second metal for stabilizing the first metal and having an interface with an interface between the organic layer and the cathode, wherein the first metal is lithium, and the second metal is aluminum; , the alloy region, the lithium concentration 0.005 part by weight to 0.3 parts by weight of the weight ratio containing Mikatsu per 100 parts by weight of the aluminum, the organic layer and
Exists in a thickness range of 1500 ° or less from the interface of the cathode.
And a protective electrode laminated on the alloy cathode
Having a thickness of the alloy cathode and the protection of the alloy cathode
An organic electroluminescent device, wherein the thickness of the organic electroluminescent device is one half to two thirds of the total thickness of the electrode .
レクトロネミネッセンス素子であって、前記陰極は、３
エレクトロンボルト以下の仕事関数を有する低仕事関数
金属である第１金属及び第１金属を安定化せしめる第２
金属からなりかつ前記有機層及び前記陰極の界面に接す
る合金領域を有し、前記第１金属はストロンチウムであ
り、前記第２金属がマグネシウムであり、前記合金領域
は、前記マグネシウムの１００重量部に対して前記スト
ロンチウムの濃度を１０重量部以上４０重量部以下の重
量比で含むことを特徴とする有機エレクトロネミネッセ
ンス素子。2. An organic electroluminescence device having an organic layer disposed between an anode and a cathode, wherein the cathode has 3 layers.
A first metal that is a low work function metal having a work function of less than electron volts and a second metal that stabilizes the first metal;
An alloy region made of metal and in contact with an interface between the organic layer and the cathode, wherein the first metal is strontium, the second metal is magnesium, and the alloy region is 100 parts by weight of the magnesium. An organic electroluminescence device comprising the strontium concentration in a weight ratio of 10 parts by weight or more and 40 parts by weight or less.
極の界面から１５００Å以下の厚さ範囲に存在すること
を特徴とする請求項２記載の有機エレクトロネミネッセ
ンス素子。3. The organic electroluminescence device according to claim 2 , wherein the alloy region exists in a thickness range of 1500 ° or less from an interface between the light emitting layer and the cathode.
有している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素子。4. The organic electroluminescent device according to claim 2 , further comprising a protective electrode laminated on said alloy cathode.
レクトロネミネッセンス素子であって、前記陰極は、３
エレクトロンボルト以下の仕事関数を有する低仕事関数
金属である第１金属及び前記第１金属を安定化せしめる
第２金属からなる合金陰極であり、前記合金陰極上に積
層された保護電極を有し、前記合金陰 極の膜厚は前記合
金陰極及び前記保護電極全体の厚さの２分の１ないし３
分の２であることを特徴とする有機エレクトロネミネッ
センス素子。5. An organic electroluminescence device having an organic layer disposed between an anode and a cathode, wherein the cathode comprises 3
An alloy cathode made of a second metal which allowed to stabilize a first metal and the first metal is a low work function metal having a work function of electron volts, have a protective electrode which is stacked on the alloy cathode, thickness of the alloy negative electrode is the case
1/2 to 3 times the thickness of the gold cathode and the entire protective electrode
The organic electroluminescence Nemi net sensing element, wherein the minute is 2.
徴とする請求項５記載の有機エレクトロルミネッセンス
素子。6. The organic electroluminescence device according to claim 5, wherein the first metal is lithium.
重量比は、前記第２金属が１０００重量部に対してリチ
ウムが５０重量部以下の重量比であることを特徴とする
請求項６記載の有機エレクトロルミネッセンス素子。7. The weight ratio of the first metal and the second metal in the alloy cathode is such that the weight ratio of the second metal is 1000 parts by weight and lithium is 50 parts by weight or less. 7. The organic electroluminescent device according to 6 .
とを特徴とする請求項５記載の有機エレクトロルミネッ
センス素子。8. The method according to claim 1, wherein the first metal is strontium.
The organic electroluminescent device according to claim 5, wherein the door.
重量比は、前記第２金属が１０００重量部に対してスト
ロンチウムが４００重量部以下の重量比であることを特
徴とする請求項８記載の有機エレクトロルミネッセンス
素子。9. The weight ratio of the first and second metals in the alloy cathode is such that the weight ratio of strontium to the second metal is 1000 parts by weight and that of strontium is 400 parts by weight or less. 9. The organic electroluminescence device according to 8 .
シウムであることを特徴とする請求項５ないし９のいず
れか１記載の有機エレクトロルミネッセンス素子。10. The organic electroluminescence device according to claim 5, wherein the second metal is aluminum or magnesium.
ことを特徴とする請求項５ないし１０のいずれか１記載
の有機エレクトロルミネッセンス素子。11. The organic electroluminescence device according to claim 5, wherein the protection electrode is made of the second metal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00682492A JP3236332B2 (en) | 1991-01-29 | 1992-01-17 | Organic electroluminescence device |
| US07/961,506 US5429884A (en) | 1992-01-17 | 1992-10-15 | Organic electroluminescent element |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP885891 | 1991-01-29 | ||
| JP3-8858 | 1991-01-29 | ||
| JP00682492A JP3236332B2 (en) | 1991-01-29 | 1992-01-17 | Organic electroluminescence device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05121172A JPH05121172A (en) | 1993-05-18 |
| JP3236332B2 true JP3236332B2 (en) | 2001-12-10 |
Family
ID=26341023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00682492A Expired - Fee Related JP3236332B2 (en) | 1991-01-29 | 1992-01-17 | Organic electroluminescence device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3236332B2 (en) |
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