JPH11307264A - Organic electroluminescent element - Google Patents
Organic electroluminescent elementInfo
- Publication number
- JPH11307264A JPH11307264A JP10107595A JP10759598A JPH11307264A JP H11307264 A JPH11307264 A JP H11307264A JP 10107595 A JP10107595 A JP 10107595A JP 10759598 A JP10759598 A JP 10759598A JP H11307264 A JPH11307264 A JP H11307264A
- Authority
- JP
- Japan
- Prior art keywords
- organic electroluminescent
- electroluminescent device
- buffer layer
- cathode
- metal
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各種の表示装置と
して広範囲に利用される発光素子であって、特に低い駆
動電圧、高輝度、安定性に優れた有機電界発光素子に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device widely used as various display devices, and more particularly to an organic electroluminescent device having a low driving voltage, high luminance and excellent stability.
【０００２】[0002]
【従来の技術】電界発光素子は、自己発光のために液晶
素子にくらべて明るく、鮮明な表示が可能であるため、
旧来多くの研究者によって研究されてきた。2. Description of the Related Art An electroluminescent device is capable of displaying a brighter and clearer display than a liquid crystal device due to self-luminous light.
It has been studied by many researchers since ancient times.
【０００３】現在、実用レベルに達し商品化されている
電界発光素子としては、無機材料のＺｎＳを用いた素子
がある。At present, as an electroluminescent element which has reached a practical level and is commercialized, there is an element using ZnS as an inorganic material.
【０００４】しかし、この様な無機の電界発光素子は発
光のための駆動電圧として２００Ｖ程度必要であるた
め、広く使用されるには至っていない。[0004] However, such an inorganic electroluminescent element requires a driving voltage of about 200 V for light emission, and thus has not been widely used.
【０００５】これに対して、有機材料を用いた電界発光
素子である有機電界発光素子は、従来、実用的なレベル
からはほど遠いものであったが、１９８７年にコダック
社のＣ．Ｗ．Ｔａｎｇらによって開発された積層構造素
子により、その特性が飛躍的に進歩した。（Ａｐｐｌ.
Ｐｈｙｓ．Ｌｅｔｔ．，５１巻，９１３頁，１９８７
年） 彼らは、蒸着膜の構造が安定であって電子を輸送するこ
とのできる蛍光体と、正孔を輸送することのできる有機
物を積層し、両方のキャリヤーを蛍光体中に注入して発
光させることに成功した。On the other hand, an organic electroluminescent device, which is an electroluminescent device using an organic material, has been far from a practical level in the past. W. The characteristics have been dramatically improved by the multilayer structure element developed by Tang et al. (Appl.
Phys. Lett. 51, 913, 1987.
Years) They stack a phosphor that has a stable structure of a deposited film and can transport electrons and an organic substance that can transport holes, and injects both carriers into the phosphor to emit light. Succeeded.
【０００６】これによって、有機電界発光素子の発光効
率が向上し、１０Ｖ以下の電圧で１０００ｃｄ／ｍ２
以上の発光が得られるようになった。As a result, the luminous efficiency of the organic electroluminescent device is improved, and 1000 cd / m 2 at a voltage of 10 V or less.
The above light emission was obtained.
【０００７】この様な有機電界発光素子の基本的な発光
特性は、非常に優れており、現在その実用化を妨げてい
る最も大きな課題の一つは安定性の不足にある。具体的
には、発光輝度が低下したり、ダークスポットと呼ばれ
る発光しない領域が発生したり、素子の短絡により破壊
が起きてしまうことである。The basic light emitting characteristics of such an organic electroluminescent device are very excellent, and one of the biggest problems that currently hinders its practical use is lack of stability. Specifically, the emission luminance is reduced, a non-light emitting region called a dark spot is generated, or destruction is caused by short-circuit of the element.
【０００８】このような特性劣化の要因の一つに電極と
有機層との界面の問題が考えられ、課題を解決のために
陰極に接する有機層を改良することが検討されている。
具体的には有機発光層と陰極の間に芳香族アミン化合物
からなる界面層を設けたり（特開平６−２６７６５８号
公報）、アルカリ金属化合物を含む電子注入層を設ける
こと（特開平９−１７５７４号公報）などが開示されて
いるが、これらではまだ不十分である。[0008] One of the causes of such characteristic deterioration is the problem of the interface between the electrode and the organic layer, and improvement of the organic layer in contact with the cathode has been studied to solve the problem.
Specifically, an interface layer made of an aromatic amine compound is provided between the organic light emitting layer and the cathode (Japanese Patent Application Laid-Open No. 6-267658), or an electron injection layer containing an alkali metal compound is provided (Japanese Patent Application Laid-Open No. 9-17574). And the like, but these are still insufficient.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、発光効率が
高く駆動寿命時の輝度の低下が小さい有機電界発光素子
を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide an organic electroluminescent device having a high luminous efficiency and a small decrease in luminance during a driving life.
【００１０】[0010]
【課題を解決するための手段】本発明は、陰極に接して
設けたバッファー層が、無機化合物と金属を含むもので
ある有機電界発光素子である。または、陽極に接して設
けたバッファー層が、金属または酸化性の無機化合物を
含む有機電界発光素子である。このような構成によれ
ば、発光効率が高く駆動寿命時の輝度の低下が小さい有
機電界発光素子が提供される。According to the present invention, there is provided an organic electroluminescence device in which a buffer layer provided in contact with a cathode contains an inorganic compound and a metal. Alternatively, the buffer layer provided in contact with the anode is an organic electroluminescent element containing a metal or an oxidizable inorganic compound. According to such a configuration, an organic electroluminescent element having a high luminous efficiency and a small decrease in luminance during a driving life is provided.
【００１１】[0011]
【発明の実施の形態】請求項１記載の本発明は、一対の
電極の間に有機層を有する有機電界発光素子であって、
前記一対の電極の内の陰極に接して設けたバッファー層
が、無機化合物と金属を含むものである有機電界発光素
子である。このようなバッファー層を設けると陰極から
の電子注入が改善され発光効率が大幅に上昇する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 is an organic electroluminescent device having an organic layer between a pair of electrodes,
An organic electroluminescent device in which a buffer layer provided in contact with a cathode in the pair of electrodes contains an inorganic compound and a metal. By providing such a buffer layer, electron injection from the cathode is improved, and the luminous efficiency is greatly increased.
【００１２】このため、駆動時の輝度の低下を低減する
ことが可能となる。ここで用いられる無機化合物として
は、例えば酸化シリコン、酸化ゲルマニウム、酸化錫、
酸化亜鉛などの酸化物、フッ化マグネシウム、フッ化カ
ルシウムなどのフッ化物等が挙げられる。For this reason, it is possible to reduce a decrease in luminance during driving. As the inorganic compound used here, for example, silicon oxide, germanium oxide, tin oxide,
Examples include oxides such as zinc oxide, and fluorides such as magnesium fluoride and calcium fluoride.
【００１３】また、請求項２に記載のように金属として
は還元性を有しているものであるとよい。具体的にはア
ルカリ金属、アルカリ土類金属、アルミニウム、亜鉛な
どの電気的陽性の大きい金属が挙げられる。It is preferable that the metal has a reducing property. Specific examples include metals having large electropositivity, such as alkali metals, alkaline earth metals, aluminum, and zinc.
【００１４】また、請求項３に記載のように金属として
仕事関数が４．０ｅＶ以下のものを用いるとよい。具体
的にはアルカリ金属、アルカリ土類金属、希土類金属、
スカンジウム、イットリウム等があり、特に、Ｌｉ、Ｍ
ｇ，Ｃａ、Ｓｒ等のアルカリ金属、アルカリ土類金属が
好適である。It is preferable to use a metal having a work function of 4.0 eV or less as a metal. Specifically, alkali metals, alkaline earth metals, rare earth metals,
Scandium, yttrium, etc., especially Li, M
Alkali metals such as g, Ca and Sr, and alkaline earth metals are preferred.
【００１５】また、請求項４記載の発明は、陰極が、仕
事関数が４．０ｅＶ以上の金属または無機化合物からな
る有機電界発光素子である。通常、仕事関数が４．０ｅ
Ｖ以上の金属を用いると発光効率が低く、駆動寿命が非
常に短いものになる。しかし、上記の構成の素子では仕
事関数が４．０ｅＶ以上の安定な金属または無機化合物
を陰極に用いても発光効率が高く、駆動寿命が長い素子
が可能となる。The invention according to claim 4 is an organic electroluminescent device in which the cathode is made of a metal or an inorganic compound having a work function of 4.0 eV or more. Normally, the work function is 4.0e
When a metal of V or more is used, the luminous efficiency is low and the driving life is extremely short. However, in the device having the above structure, even when a stable metal or inorganic compound having a work function of 4.0 eV or more is used for the cathode, a device having high luminous efficiency and long driving life can be obtained.
【００１６】具体的にはアルミニウム、銀、銅、金、
錫、インジウム、マンガン、ニッケル、白金、酸化イン
ジウム、酸化錫などが挙げられる。Specifically, aluminum, silver, copper, gold,
Examples include tin, indium, manganese, nickel, platinum, indium oxide, and tin oxide.
【００１７】次に、請求項５記載の発明は、一対の電極
の間に有機層を有する有機電界発光素子であって、前記
一対の電極の内の陽極に接して設けたバッファー層が、
金属を含む有機電界発光素子である。このようなバッフ
ァー層を設けると、陽極からの正孔注入が容易に起き発
光効率、寿命特性の優れた素子が得られる。Next, an invention according to claim 5 is an organic electroluminescent device having an organic layer between a pair of electrodes, wherein the buffer layer provided in contact with the anode of the pair of electrodes comprises:
An organic electroluminescent device containing a metal. When such a buffer layer is provided, holes are easily injected from the anode, and an element having excellent luminous efficiency and life characteristics can be obtained.
【００１８】さらに、請求項６に記載のように含有する
金属は仕事関数が４．０ｅＶ以上であるとよい。具体的
には、アルミニウム、銀、銅、金、錫、インジウム、マ
ンガン、ニッケル、白金、などが挙げられる。Further, the metal contained as described in claim 6 preferably has a work function of 4.0 eV or more. Specific examples include aluminum, silver, copper, gold, tin, indium, manganese, nickel, and platinum.
【００１９】また、請求項７記載の発明は、一対の電極
の間に有機層を有する有機電界発光素子であって、前記
一対の電極の内の陽極に接して設けたバッファー層が、
酸化性の無機化合物を含む有機電界発光素子である。酸
化性の無機化合物としては、過マンガン酸化合物、クロ
ム酸化合物、過酸化物、酸化性金属塩、酸化性酸化物な
どが挙げられる。According to a seventh aspect of the present invention, there is provided an organic electroluminescent device having an organic layer between a pair of electrodes, wherein the buffer layer provided in contact with an anode of the pair of electrodes comprises:
An organic electroluminescent device containing an oxidizing inorganic compound. Examples of the oxidizable inorganic compound include a permanganate compound, a chromate compound, a peroxide, an oxidizable metal salt, and an oxidizable oxide.
【００２０】また、請求項８記載の発明は、一対の電極
が、いずれも可視光領域での光透過率が２０％以上であ
る有機電界発光素子であり、発光効率が高く寿命特性の
優れた透過型の発光素子が可能となる。電極としては具
体的には透明電極であるＩＴＯや酸化錫のほかに金属の
薄膜を用いることができる。The invention according to claim 8 is an organic electroluminescent device in which each of the pair of electrodes has a light transmittance of 20% or more in a visible light region, and has high luminous efficiency and excellent life characteristics. A transmissive light emitting element can be obtained. Specifically, a metal thin film can be used in addition to ITO or tin oxide which is a transparent electrode.
【００２１】なお、上記バッファー層の形成方法として
は真空蒸着法による方法が好適であるが、他の薄膜形成
方法を用いてもよい。また、上記バッファー層の膜厚は
非常に薄くても効果があり、０．１ｎｍ以上あればよ
い。The buffer layer is preferably formed by a vacuum deposition method, but other thin film forming methods may be used. In addition, even if the thickness of the buffer layer is very thin, the effect is obtained, and it is sufficient that the thickness is 0.1 nm or more.
【００２２】また、発光材としては各種の蛍光性金属錯
体化合物、オキサゾール誘導体やスチリル誘導体などの
蛍光性有機化合物、ポリパラフェニレンビニレンなどの
蛍光性高分子化合物など各種の蛍光材料を用いることが
できる。As the luminescent material, various fluorescent materials such as various fluorescent metal complex compounds, fluorescent organic compounds such as oxazole derivatives and styryl derivatives, and fluorescent high molecular compounds such as polyparaphenylene vinylene can be used. .
【００２３】また、発光層にキナクリドン系化合物やク
マリン系化合物、ルブレン、ペリレンなど縮合多環化合
物などの各種蛍光材料をドーパントとして添加すること
によりさらに高効率、高輝度、高信頼性の有機電界発光
素子を作製することができる。Further, by adding various fluorescent materials such as quinacridone-based compounds, coumarin-based compounds, and condensed polycyclic compounds such as rubrene and perylene to the light-emitting layer as dopants, organic electroluminescence with higher efficiency, higher luminance and higher reliability can be obtained. An element can be manufactured.
【００２４】また本発明の素子構造としては、陰極また
は陽極に接してバッファー層が設けられていればどのよ
うなものでもよく、バッファー層は陰極及び陽極の両方
に用いても、片方のみに用いてもよい。陰極に接して設
けたバッファー層のみを用いた場合の一例を示すと以下
のようになる。また、通常は基板上に陽極から陰極の順
に積層するが、これとは逆に基板上に陰極から陽極の順
に積層してもよい。The device structure of the present invention may be any device provided that a buffer layer is provided in contact with the cathode or the anode. The buffer layer may be used for both the cathode and the anode, or may be used for only one of them. You may. An example in which only the buffer layer provided in contact with the cathode is used is as follows. In addition, although usually laminated on the substrate in order from the anode to the cathode, on the contrary, it may be laminated on the substrate in the order from the cathode to the anode.
【００２５】陽極／発光層／バッファー層／陰極 陽極／正孔輸送層／発光層／バッファー層／陰極 陽極／正孔注入層／正孔輸送層／発光層／バッファー層
／陰極 陽極／正孔輸送層／発光層／電子輸送層／バッファー層
／陰極 陽極／正孔注入層／正孔輸送層／発光層／電子輸送層／
バッファー層／陰極 以下に、本発明を具体的な実施の形態によりに説明す
る。以下の実施の形態では、正孔輸送材として（化１）
で示す無置換トリフェニルアミン四量体（ＴＰＴ）を、
発光材としてトリス（８−キノリノール）アルミニウム
（以下Ａｌｑという。）を用い、陽極、正孔輸送層、発
光層、陰極の順に積層した素子の構成を代表的に示す
が、本発明はこの構成に限定されるものではもちろんな
い。Anode / light-emitting layer / buffer layer / cathode anode / hole transport layer / light-emitting layer / buffer layer / cathode anode / hole injection layer / hole transport layer / light-emitting layer / buffer layer / cathode anode / hole transport Layer / light-emitting layer / electron transport layer / buffer layer / cathode anode / hole injection layer / hole transport layer / light-emitting layer / electron transport layer /
Buffer layer / cathode Hereinafter, the present invention will be described with reference to specific embodiments. In the following embodiment, the hole transport material is represented by
An unsubstituted triphenylamine tetramer (TPT) represented by
A structure of an element in which tris (8-quinolinol) aluminum (hereinafter referred to as Alq) is used as a light emitting material and an anode, a hole transport layer, a light emitting layer, and a cathode are stacked in this order is shown as a typical example. Of course, it is not limited.
【００２６】[0026]
【化１】 Embedded image
【００２７】（実施の形態１）本実施の形態の電界発光
素子は、図１に示すように、ガラス基板１上に透明電極
２としてＩＴＯ電極をあらかじめ形成したものの上に、
正孔輸送層３、発光層４、陰極バッファー層５、陰極６
の順に蒸着して作製した構成を有する。(Embodiment 1) As shown in FIG. 1, an electroluminescent device according to the present embodiment is obtained by forming an ITO electrode as a transparent electrode 2 on a glass substrate 1 in advance.
Hole transport layer 3, light emitting layer 4, cathode buffer layer 5, cathode 6
In that order.
【００２８】まず、十分に洗浄したガラス基板（ＩＴＯ
電極は成膜済み）、ＴＰＴ、Ａｌｑ、一酸化シリコン、
アルミニウム及びリチウムを蒸着装置にセットした。First, a sufficiently cleaned glass substrate (ITO)
Electrodes have been deposited), TPT, Alq, silicon monoxide,
Aluminum and lithium were set in a vapor deposition device.
【００２９】ついで、２×１０-6ｔｏｒｒまで排気した
後、０．１ｎｍ／秒の速度でセットしたＴＰＴを蒸着し
正孔輸送層を５０ｎｍ形成した。ついで、セットした発
光材のＡｌｑを０．１ｎｍ／秒の速度で蒸着し、膜厚２
５ｎｍの発光層を形成した。次に、一酸化シリコンとリ
チウムを異なる蒸着源より蒸着し、一酸化シリコンとリ
チウムとからなる陰極バッファー層を５ｎｍ積層した。
その後、アルミニウムの蒸着を０．５ｎｍ／秒の速度で
行い、その厚さを１５０ｎｍとした。なお、これらの蒸
着はいずれも真空を破らずに連続して行い、膜厚は水晶
振動子によってモニターした。Then, after evacuating to 2 × 10 -6 torr, TPT set at a rate of 0.1 nm / sec was deposited to form a hole transport layer of 50 nm. Then, the set luminescent material Alq was vapor-deposited at a rate of 0.1 nm / sec.
A 5 nm light emitting layer was formed. Next, silicon monoxide and lithium were evaporated from different evaporation sources, and a 5 nm-thick cathode buffer layer composed of silicon monoxide and lithium was stacked.
Thereafter, aluminum was deposited at a rate of 0.5 nm / sec, and the thickness was set to 150 nm. These depositions were continuously performed without breaking the vacuum, and the film thickness was monitored with a quartz oscillator.
【００３０】そして、素子作製後、直ちに乾燥窒素中で
電極の取り出しを行い、引続き特性測定を行った。ここ
で、得られた素子の発光効率は、発光輝度５００ｃｄ／
ｍ2の場合の値で定義した。また、駆動寿命は初期輝度
を１０００ｃｄ／ｍ2として一定電流で駆動したとき
に、輝度が初期の半分の５００ｃｄ／ｍ2になる間での
時間で定義した。Immediately after the device was manufactured, the electrodes were taken out in dry nitrogen, and the characteristics were measured. Here, the luminous efficiency of the obtained device was 500 cd / luminance.
It was defined by the value for m 2 . The drive life was defined as the time required for the luminance to reach half of the initial value, 500 cd / m 2 , when the device was driven at a constant current with an initial luminance of 1000 cd / m 2 .
【００３１】その結果、本実施の形態においては、発光
特性は１．５ｌｍ／Ｗ、駆動寿命は６００時間であっ
た。As a result, in the present embodiment, the light emission characteristics were 1.5 lm / W, and the driving life was 600 hours.
【００３２】一方、比較のために、陰極バッファー層を
設けない以外は同様にして有機電界発光素子を作製し、
特性を調べた。その結果、発光効率は０．３ｌｍ／Ｗ、
駆動寿命は１時間以下であった。On the other hand, for comparison, an organic electroluminescent device was prepared in the same manner except that no cathode buffer layer was provided.
The characteristics were investigated. As a result, the luminous efficiency is 0.3 lm / W,
The drive life was less than one hour.
【００３３】以上より、本実施の形態の有機電界発光素
子は、発光効率、駆動寿命が大幅に改善されていること
が確認された。From the above, it was confirmed that the organic electroluminescent device of the present embodiment has significantly improved luminous efficiency and driving life.
【００３４】（実施の形態２）本実施の形態では、陰極
バッファー層として（表１）に示した無機化合物と金属
の混合膜を用いた以外は、実施の形態１と同様に有機電
界発光素子を作製し、その特性を評価した。(Embodiment 2) In this embodiment, an organic electroluminescent device is formed in the same manner as in Embodiment 1, except that a mixed film of an inorganic compound and a metal shown in (Table 1) is used as a cathode buffer layer. Was prepared and its characteristics were evaluated.
【００３５】その結果を、以下の（表１）に示す。The results are shown in the following (Table 1).
【００３６】[0036]
【表１】 [Table 1]
【００３７】（表１）より、本実施の形態の有機電界発
光素子は、発光効率、駆動寿命が大幅に改善されている
ことが確認された。From Table 1, it was confirmed that the organic electroluminescent device of the present embodiment had significantly improved luminous efficiency and driving life.
【００３８】（実施の形態３）本実施の形態の電界発光
素子は、図２に示すように、ガラス基板１上に透明電極
２としてＩＴＯ電極をあらかじめ形成したものの上に、
陽極バッファー層７、正孔輸送層３、発光層４、陰極６
の順に蒸着して作製した構成を有する。(Embodiment 3) As shown in FIG. 2, the electroluminescent device of the present embodiment is obtained by forming an ITO electrode as a transparent electrode 2 on a glass substrate 1 in advance.
Anode buffer layer 7, hole transport layer 3, light emitting layer 4, cathode 6
In that order.
【００３９】まず、十分に洗浄したガラス基板（ＩＴＯ
電極は成膜済み）、ＴＰＴ、Ａｌｑ、銀、アルミニウム
及びリチウムを蒸着装置にセットした。First, a sufficiently cleaned glass substrate (ITO)
Electrodes were formed), TPT, Alq, silver, aluminum and lithium were set in a vapor deposition device.
【００４０】ついで、２×１０-6ｔｏｒｒまで排気した
後、ＴＰＴと銀を異なる蒸着源より蒸着し、ＴＰＴと銀
からなる陽極バッファー層７を５ｎｍ積層した。次に
０．１ｎｍ／秒の速度でセットしたＴＰＴを蒸着し正孔
輸送層を５０ｎｍ形成した。ついで、セットした発光材
のＡｌｑを０．１ｎｍ／秒の速度で蒸着し、膜厚２５ｎ
ｍの発光層を形成した。その後、アルミニウム（Ａｌ）
とリチウム（Ｌｉ）を異なる蒸着源より蒸着し、厚さ１
５０ｎｍのＡｌＬｉ陰極を形成した。なお、これらの蒸
着はいずれも真空を破らずに連続して行い、膜厚は水晶
振動子によってモニターした。Then, after evacuation to 2 × 10 −6 torr, TPT and silver were evaporated from different evaporation sources, and an anode buffer layer 7 made of TPT and silver was laminated to a thickness of 5 nm. Next, TPT set at a rate of 0.1 nm / sec was deposited to form a hole transport layer of 50 nm. Then, the set luminescent material Alq was deposited at a rate of 0.1 nm / sec.
m light emitting layers were formed. Then, aluminum (Al)
And lithium (Li) are deposited from different deposition sources and have a thickness of 1
A 50 nm AlLi cathode was formed. These depositions were continuously performed without breaking the vacuum, and the film thickness was monitored with a quartz oscillator.
【００４１】そして、素子作製後、直ちに乾燥窒素中で
電極の取り出しを行い、引続き特性測定を行った。ここ
で、得られた素子の発光効率は、発光輝度５００ｃｄ／
ｍ2の場合の値で定義した。また、駆動寿命は初期輝度
１０００ｃｄ／ｍ2として一定電流で駆動したときに、
輝度が初期の半分の５００ｃｄ／ｍ2になる間での時間
で定義した。Immediately after the device was manufactured, the electrodes were taken out in dry nitrogen, and the characteristics were measured. Here, the luminous efficiency of the obtained device was 500 cd / luminance.
It was defined by the value for m 2 . The driving life is 1000 cd / m 2 as the initial luminance, and when driven at a constant current,
It was defined as the time required for the luminance to reach half the initial value of 500 cd / m 2 .
【００４２】その結果、本実施の形態においては、発光
特性は２．０ｌｍ／Ｗ、駆動寿命は１０１０時間であっ
た。As a result, in this embodiment, the light emission characteristics were 2.0 lm / W, and the driving life was 1010 hours.
【００４３】一方、比較のために、陽極バッファー層を
設けない以外は同様にして有機電界発光素子を作製し、
特性を調べた。On the other hand, for comparison, an organic electroluminescent device was prepared in the same manner except that the anode buffer layer was not provided.
The characteristics were investigated.
【００４４】その結果、発光効率は１．０ｌｍ／Ｗ、駆
動寿命は５００時間であった。以上より、本実施の形態
の有機電界発光素子は、発光効率、駆動寿命が大幅に改
善されていることが確認された。As a result, the luminous efficiency was 1.0 lm / W, and the driving life was 500 hours. From the above, it was confirmed that the organic electroluminescent device of the present embodiment had significantly improved luminous efficiency and driving life.
【００４５】（実施の形態４）本実施の形態では、陽極
バッファー層として（表２）に示した化合物を用いた以
外は、実施の形態３と同様に有機電界発光素子を作製
し、その特性を評価した。(Embodiment 4) In this embodiment, an organic electroluminescent device was manufactured in the same manner as in Embodiment 3, except that the compounds shown in (Table 2) were used as the anode buffer layer. Was evaluated.
【００４６】その結果を、以下の（表２）に示す。The results are shown in the following (Table 2).
【００４７】[0047]
【表２】 [Table 2]
【００４８】（表２）より、本実施の形態の有機電界発
光素子は、発光効率、駆動寿命が大幅に改善されている
ことが確認された。From Table 2, it was confirmed that the organic electroluminescent device of the present embodiment had significantly improved luminous efficiency and driving life.
【００４９】[0049]
【発明の効果】以上のように、本発明によれば、発光効
率が高く駆動寿命時の輝度の低下が小さい有機電界発光
素子が得られるという有利な効果が得られる。As described above, according to the present invention, there is obtained an advantageous effect that an organic electroluminescent device having a high luminous efficiency and a small decrease in luminance during a driving life can be obtained.
【図１】本発明の実施の形態における有機電界発光素子
の構成を示す図FIG. 1 is a diagram showing a configuration of an organic electroluminescent device according to an embodiment of the present invention.
【図２】本発明の実施の形態における有機電界発光素子
の構成を示す図FIG. 2 is a diagram showing a configuration of an organic electroluminescent device according to an embodiment of the present invention.
１ ガラス基板 ２ 透明電極 ３ 正孔輸送層 ４ 発光層 ５ 陰極バッファー層 ６ 陰極 ７ 陽極バッファー層 DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Transparent electrode 3 Hole transport layer 4 Light emitting layer 5 Cathode buffer layer 6 Cathode 7 Anode buffer layer
Claims (8)
界発光素子であって、前記一対の電極の内の陰極に接し
て設けたバッファー層が、無機化合物と金属を含むもの
である有機電界発光素子。1. An organic electroluminescent device having an organic layer between a pair of electrodes, wherein a buffer layer provided in contact with a cathode in the pair of electrodes contains an inorganic compound and a metal. element.
求項１記載の有機電界発光素子。2. The organic electroluminescent device according to claim 1, wherein the metal has a reducing property.
である請求項１記載の有機電界発光素子。3. The organic electroluminescent device according to claim 1, wherein the work function of the metal is 4.0 eV or less.
属または無機化合物からなる請求項１から３のいずれか
に記載の有機電界発光素子。4. The organic electroluminescent device according to claim 1, wherein the cathode is made of a metal or an inorganic compound having a work function of 4.0 eV or more.
界発光素子であって、前記一対の電極の内の陽極に接し
て設けたバッファー層が、金属を含むものである有機電
界発光素子。5. An organic electroluminescent device having an organic layer between a pair of electrodes, wherein the buffer layer provided in contact with the anode in the pair of electrodes contains a metal.
である請求項５記載の有機電界発光素子。6. The organic electroluminescent device according to claim 5, wherein the metal has a work function of 4.0 eV or more.
界発光素子であって、前記一対の電極の内の陽極に接し
て設けたバッファー層が、酸化性を有する無機化合物を
含むものである有機電界発光素子。7. An organic electroluminescent device having an organic layer between a pair of electrodes, wherein the buffer layer provided in contact with the anode in the pair of electrodes contains an oxidizing inorganic compound. Electroluminescent device.
光透過率が２０％以上である請求項１から７のいずれか
に記載の有機電界発光素子。8. The organic electroluminescent device according to claim 1, wherein each of the pair of electrodes has a light transmittance of 20% or more in a visible light region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10107595A JPH11307264A (en) | 1998-04-17 | 1998-04-17 | Organic electroluminescent element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10107595A JPH11307264A (en) | 1998-04-17 | 1998-04-17 | Organic electroluminescent element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11307264A true JPH11307264A (en) | 1999-11-05 |
Family
ID=14463151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10107595A Pending JPH11307264A (en) | 1998-04-17 | 1998-04-17 | Organic electroluminescent element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11307264A (en) |
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