JPH10312882A - Organic electroluminescence element - Google Patents
Organic electroluminescence elementInfo
- Publication number
- JPH10312882A JPH10312882A JP9121227A JP12122797A JPH10312882A JP H10312882 A JPH10312882 A JP H10312882A JP 9121227 A JP9121227 A JP 9121227A JP 12122797 A JP12122797 A JP 12122797A JP H10312882 A JPH10312882 A JP H10312882A
- Authority
- JP
- Japan
- Prior art keywords
- pedestal
- cap
- electroluminescent device
- dark spot
- substrate
- 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
- 238000005401 electroluminescence Methods 0.000 title abstract 2
- 239000000758 substrate Substances 0.000 claims abstract description 23
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000012044 organic layer Substances 0.000 claims abstract description 9
- 239000000872 buffer Substances 0.000 claims description 13
- 239000010410 layer Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 8
- 239000011521 glass Substances 0.000 abstract description 6
- 230000005525 hole transport Effects 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 13
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- -1 m-methylphenyl Chemical group 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- FDRNXKXKFNHNCA-UHFFFAOYSA-N 4-(4-anilinophenyl)-n-phenylaniline Chemical compound C=1C=C(C=2C=CC(NC=3C=CC=CC=3)=CC=2)C=CC=1NC1=CC=CC=C1 FDRNXKXKFNHNCA-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/872—Containers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8721—Metallic sealing arrangements
Landscapes
- Electroluminescent Light Sources (AREA)
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、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 relates 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、
古くから多くの研究者によって研究されてきた。現在実
用レベルに達した電界発光素子としては、無機材料のＺ
ｎＳを用いた素子がある。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以上
が必要であるため、広く使用されるには至っていない。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. As the electroluminescent device that has reached the practical level at present, the inorganic material Z
There is an element using nS. However, such an inorganic electroluminescent element has not been widely used since a driving voltage of 200 V or more is required for light emission.
【０００３】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。彼らは蒸着膜の構造
が安定で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とを積層し、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。
これによって有機電界発光素子の発光効率が向上し、１
０Ｖ以下の電圧で１０００ｃｄ／ｍ2 以上の発光が得ら
れる様になった。その後多くの研究者によってその特性
向上のための研究が行われ、現在では１００００ｃｄ／
ｍ2 以上の発光特性が得られている。On the other hand, an organic electroluminescent device, which is an electroluminescent device using an organic material, is far from a practical level in the past. W. The characteristics have been drastically improved by the laminated structure element developed by Tang et al. They stacked a phosphor that can transport electrons with a stable structure of the deposited film and an organic substance that can transport holes, and succeeded in emitting light by injecting both carriers into the phosphor. did.
As a result, the luminous efficiency of the organic electroluminescent device is improved,
Light emission of 1000 cd / m 2 or more was obtained at a voltage of 0 V or less. Since then, many researchers have studied to improve the characteristics, and at present, 10,000 cd /
Light emission characteristics of m 2 or more are obtained.
【０００４】この様な有機電界発光素子の基本的な発光
特性はすでに十分実用範囲にあり、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、拡大したり、素子の短
絡により破壊が起きてしまうことなどである。特に高温
高湿下に放置した場合にはダークスポットが大きく拡大
し、有機電界発光素子の保存寿命を決める大きな要因と
なっている。The basic emission characteristics of such an organic electroluminescent device are already in a practically usable range, and one of the biggest problems currently hindering its practical use is lack of stability.
Specifically, light emission luminance is reduced, a non-light-emitting region called a dark spot is generated and enlarged, and destruction is caused by short-circuiting of an element. In particular, when left under high temperature and high humidity, dark spots greatly expand, which is a major factor in determining the storage life of the organic electroluminescent device.
【０００５】[0005]
【発明が解決しようとする課題】本発明の課題は、以上
の様な状況に鑑み、駆動電圧が低く、高輝度でさらに安
定性に優れた有機電界発光素子を提供することにある。
特に高温高湿下に素子を放置してもダークスポットの拡
大や発光特性の劣化のない、信頼性が大幅に向上した有
機電界発光素子を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide an organic electroluminescent device having a low driving voltage, high luminance and excellent stability in view of the above situation.
In particular, it is an object of the present invention to provide an organic electroluminescent device having significantly improved reliability without causing dark spot expansion and deterioration of light emitting characteristics even when the device is left under high temperature and high humidity.
【０００６】[0006]
【課題を解決するための手段】本発明の有機電界発光素
子においては、溶接による接合部を設けてキャップを固
定するものである。この発明によれば、高温高湿下に素
子を放置してもダークスポットの拡大や発光特性の劣化
のない、信頼性が大幅に向上した有機電界発光素子が得
られる。In the organic electroluminescent device of the present invention, a cap is fixed by providing a joint by welding. According to the present invention, it is possible to obtain an organic electroluminescent device having significantly improved reliability without causing dark spot expansion and deterioration of light emitting characteristics even when the device is left under high temperature and high humidity.
【０００７】[0007]
【発明の実施の形態】上記課題を解決するために、本発
明者らは様々な有機電界発光素子を試作し、非発光領域
であるダークスポットの評価を行った。その結果、請求
項１から４記載の有機電界発光素子では、ダークスポッ
トの拡大が非常に小さいことを見出した。以下順次説明
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above problems, the present inventors prototyped various organic electroluminescent devices and evaluated dark spots as non-light emitting regions. As a result, it has been found that in the organic electroluminescent device according to claims 1 to 4, the enlargement of the dark spot is very small. This will be described sequentially below.
【０００８】本発明の請求項１に記載の発明は、基板上
に形成された一対の電極の間に有機層が少なくとも一層
形成された有機電界発光素子において、素子が固定され
た台座と、前記素子を覆うとともに前記台座に溶接され
たキャップとを少なくとも有することを特徴とした有機
電界発光素子である。素子を固定した台座とキャップを
溶接により接合することにより、外部からの水の侵入を
無くすことができる。溶接は瞬間的に行うことが可能な
ので、条件を適切に選べば、溶接による接合を行っても
素子がダメージを受けるとはほとんどなくなる。なお、
溶接による接合を行う際、素子温度が上昇しないように
冷却機構を施すとさらに良い。According to a first aspect of the present invention, there is provided an organic electroluminescent device having at least one organic layer formed between a pair of electrodes formed on a substrate, wherein the pedestal on which the device is fixed is provided. An organic electroluminescent device comprising at least a cap that covers the device and is welded to the pedestal. By joining the pedestal to which the element is fixed and the cap by welding, it is possible to prevent water from entering from outside. Since welding can be performed instantaneously, if the conditions are properly selected, even if welding is performed, the element is hardly damaged. In addition,
When joining by welding, it is more preferable to provide a cooling mechanism so that the element temperature does not rise.
【０００９】請求項２に記載の発明は、基板またはキャ
ップと台座の間に緩衝体が形成されていることを特徴と
した請求項１記載の有機電界発光素子である。このよう
にすると、溶接時の衝撃を低減することができ、信頼性
がさらに向上した素子が実現できる。特に溶接時に生じ
る飛散物が素子に悪影響を与えることを防止でき、信頼
性の向上が可能となる。緩衝体としては、樹脂やゴムな
ど緩衝効果があるものならあらゆるものが使用可能であ
り、具体的にはフッ素樹脂、フッ素ゴム、エポキシ樹
脂、アクリル樹脂、シリコンゴム、ウレタン樹脂、ウレ
タンゴムなどが用いられる。また、緩衝体として接着性
のあるものを基板と台座の間に用いると、基板を台座に
強固に固定することが可能となり、素子作製時または作
製後の機械的、熱的衝撃等による基板の離脱を防止する
ことができる。さらに、緩衝体として素子に用いる電極
や有機層に対する腐食性のないものを選べば、これらを
覆うように緩衝体を形成することもできる。According to a second aspect of the present invention, there is provided the organic electroluminescent device according to the first aspect, wherein a buffer is formed between the substrate or the cap and the pedestal. In this way, the impact at the time of welding can be reduced, and an element with further improved reliability can be realized. In particular, it is possible to prevent scattered matters generated at the time of welding from adversely affecting the element, thereby improving reliability. As the buffer, any material having a buffering effect such as resin or rubber can be used.Specifically, fluorine resin, fluorine rubber, epoxy resin, acrylic resin, silicone rubber, urethane resin, urethane rubber, etc. are used. Can be Also, if an adhesive material is used between the substrate and the pedestal as a buffer, the substrate can be firmly fixed to the pedestal, and the substrate may be mechanically or thermally shocked at the time of element fabrication or after fabrication. Separation can be prevented. Furthermore, if a material that does not corrode the electrode or organic layer used in the element is selected as the buffer, the buffer can be formed so as to cover these.
【００１０】請求項３に記載の発明は、基板上に形成さ
れた一対の電極の間に有機層が少なくとも一層形成され
た有機電界発光素子において、基板に設けられた溶接可
能部分と、前記素子を覆うとともに前記溶接可能部分に
溶接されたキャップとを少なくとも有することを特徴と
した有機電界発光素子である。基板の溶接可能部分とキ
ャップを溶接で接合することで外部からの水の侵入がな
くなり、信頼性の向上した素子が実現できる。基板に設
ける溶接可能部分としては、金属など溶接可能なもので
あれば形状等は問題ではない。According to a third aspect of the present invention, there is provided an organic electroluminescent device having at least one organic layer formed between a pair of electrodes formed on a substrate, wherein a weldable portion provided on the substrate is provided. And at least a cap welded to the weldable portion. By joining the weldable portion of the substrate and the cap by welding, water does not enter from the outside, and an element with improved reliability can be realized. The shape or the like of the weldable portion provided on the substrate does not matter as long as it can be welded, such as metal.
【００１１】請求項４記載の発明は、基板または溶接可
能部分とキャップの間に緩衝体が形成されていることを
特徴とした請求項３記載の有機電界発光素子であり、溶
接時の衝撃を低減することができ、さらに信頼性を向上
させることができる。特に溶接時に生じる飛散物が素子
に悪影響を与えることを防止でき、信頼性の向上が可能
である。緩衝体としては樹脂やゴムなど緩衝効果がある
ものならあらゆるものが使用可能であり、具体的にはフ
ッ素樹脂、フッ素ゴム、エポキシ樹脂、アクリル樹脂、
シリコンゴム、ウレタン樹脂、ウレタンゴムなどが用い
られる。さらに、緩衝体として素子に用いる電極や有機
層に対する腐食性のないものを選べば、これらを覆うよ
うに緩衝体を形成することもできる。According to a fourth aspect of the present invention, there is provided the organic electroluminescent device according to the third aspect, wherein a buffer is formed between the substrate or the weldable portion and the cap. Can be reduced, and the reliability can be further improved. In particular, it is possible to prevent scattered matters generated at the time of welding from adversely affecting the element, and it is possible to improve reliability. Any material can be used as the buffer, as long as it has a buffering effect such as resin or rubber.Specifically, fluorine resin, fluorine rubber, epoxy resin, acrylic resin,
Silicon rubber, urethane resin, urethane rubber, or the like is used. Furthermore, if a material that does not corrode the electrode or organic layer used in the element is selected as the buffer, the buffer can be formed so as to cover these.
【００１２】なお、本発明で用いられる有機層として
は、通常の有機電界発光素子で用いられるものでよい
が、信頼性の高いものを得るには耐熱性が向上されたも
のがよいことは言うまでもない。The organic layer used in the present invention may be a layer used in an ordinary organic electroluminescent device, but it is needless to say that an organic layer having improved heat resistance is preferable in order to obtain a highly reliable one. No.
【００１３】以下、本発明の実施の形態について図１か
ら図４を用いて具体的に説明するが、本発明はこれらに
よって限定されない。なお以下の実施の形態では正孔輸
送材として、Ｎ，Ｎ’−ビス（ｍ−メチルフェニル）−
Ｎ，Ｎ’−ジフェニルベンジジン（ＴＰＤ）、発光材と
してトリス（８−キノリノール）アルミニウム（Ａｌ
ｑ）を用い、陽極、正孔輸送層、発光層、陰極の順に積
層した素子を示すが、これらによって本発明は限定され
ないことは言うまでもない。Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 4, but the present invention is not limited thereto. In the following embodiments, N, N'-bis (m-methylphenyl)-is used as the hole transport material.
N, N'-diphenylbenzidine (TPD), tris (8-quinolinol) aluminum (Al
q) shows an element in which an anode, a hole transport layer, a light emitting layer, and a cathode are laminated in this order, but it goes without saying that the present invention is not limited by these.
【００１４】（実施の形態１）有機電界発光素子は、図
１に示すように、ガラス基板１上に陽極２として透明な
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５としてアルミニウム／リチウム
（Ａｌ／Ｌｉ）電極を順に蒸着して作製したものであ
る。まず、十分に洗浄したガラス基板１（ＩＴＯ電極２
は成膜済み）、ＴＰＤ、Ａｌｑを蒸着装置にセットし
た。１×１０-6ｔｏｒｒまで排気した後、０．１ｎｍ／
秒の速度でＴＰＤを蒸着し，正孔輸送層３を５０ｎｍ形
成した。次に、発光材のＡｌｑを０．１ｎｍ／秒の速度
で蒸着し、膜厚５０ｎｍの発光層４を形成した。Ａｌ／
Ｌｉ電極５の蒸着は０．５ｎｍ／秒の速度で行い、その
厚さを１５０ｎｍとした。これらの蒸着はいずれも真空
を破らずに連続して行った。また膜厚は水晶振動子によ
ってモニターした。次に、蒸着装置から取り出した素子
を、台座６に設けた電極取り出し部７に導電性ペースト
を用いて固定した。そして、光取り出し窓８を設けた金
属製のキャップ９と台座６とを溶接により接合し、これ
らの溶接による接合部１０を設けて素子を完成させた。
引続き発光特性の測定および耐湿試験を行った。(Embodiment 1) As shown in FIG. 1, an organic electroluminescent device is obtained by forming a transparent ITO electrode as an anode 2 on a glass substrate 1 in advance, a hole transport layer 3 and a light emitting layer. 4. As the cathode 5, an aluminum / lithium (Al / Li) electrode is sequentially deposited and produced. First, a sufficiently cleaned glass substrate 1 (ITO electrode 2
Was deposited), TPD, and Alq were set in a vapor deposition apparatus. After evacuating to 1 × 10 −6 torr, 0.1 nm /
The hole transport layer 3 was formed to a thickness of 50 nm by vapor deposition of TPD at a speed of seconds. Next, a light emitting material Alq was deposited at a rate of 0.1 nm / sec to form a light emitting layer 4 having a thickness of 50 nm. Al /
The deposition of the Li electrode 5 was performed at a rate of 0.5 nm / sec, and the thickness was set to 150 nm. All of these depositions were performed continuously without breaking vacuum. The film thickness was monitored by a quartz oscillator. Next, the element taken out from the vapor deposition device was fixed to an electrode take-out part 7 provided on the pedestal 6 using a conductive paste. Then, the metal cap 9 provided with the light extraction window 8 and the pedestal 6 were joined by welding, and a joint 10 was provided by welding to complete the element.
Subsequently, the emission characteristics were measured and a moisture resistance test was performed.
【００１５】得られた素子の発光特性は１００ｍＡ／ｃ
ｍ2 の電流を印加した場合の発光輝度で定義した。ま
た、耐湿試験は、素子を６０℃、９０％の環境下に１０
００時間放置して行い、試験前後の素子の発光特性およ
びダークスポットの直径を測定した。その結果、初期の
発光特性は３５００ｃｄ／ｍ2 、ダークスポットの直径
は２０μｍであるのに対し、試験後の発光特性は２８０
０ｃｄ／ｍ2 、ダークスポットの直径は２５μｍであっ
た。比較のために金属製のキャップを設けない素子を作
製して同様の評価を行った。その結果、初期の発光特性
は３６００ｃｄ／ｍ2 、ダークスポットの直径は１８μ
ｍであったが、約１０時間放置後にはダークスポットは
５００μｍ以上となり、１０００時間後では発光しなか
った。これより、本発明による有機電界発光素子は、高
温高湿下での信頼性が大幅に向上した優れたものである
ことが分かった。The light emitting characteristic of the obtained device is 100 mA / c
It was defined as the emission luminance when a current of m 2 was applied. In addition, the moisture resistance test was carried out at a temperature of 60 ° C. and 90% for 10%.
This was left for 00 hours, and the light emission characteristics of the device before and after the test and the diameter of the dark spot were measured. As a result, the initial light emission characteristics were 3500 cd / m 2 and the diameter of the dark spot was 20 μm, whereas the light emission characteristics after the test were 280.
0 cd / m 2 , and the diameter of the dark spot was 25 μm. For comparison, a device without a metal cap was prepared and subjected to the same evaluation. As a result, the initial light emission characteristics were 3600 cd / m 2 , and the diameter of the dark spot was 18 μm.
m, but the dark spot became 500 μm or more after standing for about 10 hours, and did not emit light after 1000 hours. From this, it was found that the organic electroluminescent device according to the present invention was an excellent device having significantly improved reliability under high temperature and high humidity.
【００１６】（実施の形態２）図２に示すように、ガラ
ス基板１と台座６の間にエポキシ樹脂接着剤からなる緩
衝体１１を設けた以外は実施の形態１と同様な方法で有
機電界発光素子を作製して評価を行った。その結果、初
期の発光特性は３５５０ｃｄ／ｍ2 、ダークスポットの
直径は１９μｍであるのに対し、試験後の発光特性は３
５００ｃｄ／ｍ 2 、ダークスポットの直径は２３μｍで
あった。これにより、本発明による有機電界発光素子
は、高温高湿下での信頼性が大幅に向上した優れたもの
であることが分かった。(Embodiment 2) As shown in FIG.
Between the substrate 1 and the pedestal 6
Except that the impact body 11 is provided, the method is the same as that of the first embodiment.
An electroluminescent device was fabricated and evaluated. As a result,
Light emission characteristics of 3550 cd / mTwoThe dark spot
Although the diameter is 19 μm, the luminescence characteristics after the test are 3
500 cd / m Two, The diameter of the dark spot is 23 μm
there were. Accordingly, the organic electroluminescent device according to the present invention
Is an excellent one with greatly improved reliability under high temperature and high humidity
It turned out to be.
【００１７】（実施の形態３）図３に示すように、ガラ
ス基板１の外周部に設けたニッケルメッキを施した鉄製
の溶接可能部分１２と、電極取り出し部７を設けたキャ
ップ１３とを溶接により接合し、これらの溶接による接
合部１４を設けた以外は実施の形態１と同様な方法で有
機電界発光素子を作製し評価を行った。その結果、初期
の発光特性は３３００ｃｄ／ｍ2 、ダークスポットの直
径は１６μｍであるのに対し、試験後の発光特性は２７
００ｃｄ／ｍ2 、ダークスポットの直径は１９μｍであ
った。これにより、本発明による有機電界発光素子は、
高温高湿下での信頼性が大幅に向上した優れたものであ
ることが分かった。(Embodiment 3) As shown in FIG. 3, a weldable portion 12 made of nickel-plated iron provided on an outer peripheral portion of a glass substrate 1 and a cap 13 provided with an electrode take-out portion 7 are welded. And an organic electroluminescent device was fabricated and evaluated in the same manner as in Embodiment 1 except that the joint portion 14 was formed by welding. As a result, the initial light emission characteristics were 3300 cd / m 2 and the diameter of the dark spot was 16 μm, whereas the light emission characteristics after the test were 27 μm.
00 cd / m 2 and the diameter of the dark spot was 19 μm. Thereby, the organic electroluminescent device according to the present invention is
It was found that the reliability under high temperature and high humidity was greatly improved.
【００１８】（実施の形態４）図４に示すように、ガラ
ス基板１とキャップ１３の間にエポキシ樹脂からなる緩
衝体１５を設けた以外は実施の形態３と同様な方法で有
機電界発光素子を作製し評価を行った。その結果、初期
の発光特性は３５００ｃｄ／ｍ2 、ダークスポットの直
径は１６μｍであるのに対し、試験後の発光特性は３４
５０ｃｄ／ｍ2、ダークスポットの直径は１８μｍであ
った。これにより、本発明による有機電界発光素子は、
高温高湿下での信頼性が大幅に向上した優れたものであ
ることが分かった。(Embodiment 4) As shown in FIG. 4, an organic electroluminescent element is formed in the same manner as in Embodiment 3 except that a buffer 15 made of epoxy resin is provided between the glass substrate 1 and the cap 13. Was prepared and evaluated. As a result, the initial light emission characteristics were 3500 cd / m 2 and the diameter of the dark spot was 16 μm, whereas the light emission characteristics after the test were 34 μm.
50 cd / m 2 and the diameter of the dark spot was 18 μm. Thereby, the organic electroluminescent device according to the present invention is
It was found that the reliability under high temperature and high humidity was greatly improved.
【００１９】[0019]
【発明の効果】以上のように本発明によれば、高温高湿
下に放置されてもダークスポットと呼ばれる非発光領域
の拡大が大幅に抑制され、優れた信頼性を有する有機電
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, the expansion of a non-light-emitting region called a dark spot even when left under high temperature and high humidity is greatly suppressed, and an organic electroluminescent device having excellent reliability can be obtained. This has the advantageous effect of being obtained.
【図１】本発明の実施の形態１における電界発光素子の
構成を模式的に示す断面図FIG. 1 is a cross-sectional view schematically illustrating a configuration of an electroluminescent element according to Embodiment 1 of the present invention.
【図２】本発明の実施の形態２における電界発光素子の
構成を模式的に示す断面図FIG. 2 is a cross-sectional view schematically illustrating a configuration of an electroluminescent device according to Embodiment 2 of the present invention.
【図３】本発明の実施の形態３における電界発光素子の
構成を模式的に示す断面図FIG. 3 is a cross-sectional view schematically illustrating a configuration of an electroluminescent device according to Embodiment 3 of the present invention.
【図４】本発明の実施の形態４における電界発光素子の
構成を模式的に示す断面図FIG. 4 is a cross-sectional view schematically illustrating a configuration of an electroluminescent element according to Embodiment 4 of the present invention.
１ ガラス基板 ２ 陽極 ３ 正孔輸送層 ４ 発光層 ５ 陰極 ６ 台座 ７ 電極取り出し部 ８ 光取り出し窓 ９、１３ キャップ １０、１４ 溶接による接合部 １１、１５ 緩衝体 １２ 溶接可能部分 DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Anode 3 Hole transport layer 4 Light emitting layer 5 Cathode 6 Pedestal 7 Electrode extraction part 8 Light extraction window 9,13 Cap 10,14 Joined part by welding 11,15 Buffer body 12 Weldable part
Claims (4)
機層が少なくとも一層形成された有機電界発光素子にお
いて、前記素子が固定された台座と、前記素子を覆うと
ともに前記台座に溶接されたキャップとを少なくとも有
することを特徴とした有機電界発光素子。1. An organic electroluminescent device in which at least one organic layer is formed between a pair of electrodes formed on a substrate, a pedestal on which the device is fixed, and a device that covers the device and is welded to the pedestal. An organic electroluminescent device comprising at least a cap.
体が形成されていることを特徴とした請求項１記載の有
機電界発光素子。2. The organic electroluminescent device according to claim 1, wherein a buffer is formed between the device or the cap and the pedestal.
機層が少なくとも一層形成された有機電界発光素子にお
いて、前記基板に設けられた溶接可能部分と、前記素子
を覆うとともに前記溶接可能部分に溶接されたキャップ
とを少なくとも有することを特徴とした有機電界発光素
子。3. An organic electroluminescent device in which at least one organic layer is formed between a pair of electrodes formed on a substrate, wherein a weldable portion provided on the substrate and the element are covered and the weldable portion is provided. An organic electroluminescent device comprising at least a cap welded to a portion.
間に緩衝体が形成されていることを特徴とした請求項３
記載の有機電界発光素子。4. A buffer is formed between the substrate or the weldable portion and the cap.
The organic electroluminescent device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9121227A JPH10312882A (en) | 1997-05-12 | 1997-05-12 | Organic electroluminescence element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9121227A JPH10312882A (en) | 1997-05-12 | 1997-05-12 | Organic electroluminescence element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10312882A true JPH10312882A (en) | 1998-11-24 |
Family
ID=14806054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9121227A Pending JPH10312882A (en) | 1997-05-12 | 1997-05-12 | Organic electroluminescence element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10312882A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100816277B1 (en) * | 2000-06-05 | 2008-03-24 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Display panel, display panel inspection method, and display panel manufacturing method |
| TWI452745B (en) * | 2010-01-19 | 2014-09-11 | Panasonic Corp | Planar light emitting device |
| EP1120838B1 (en) * | 2000-01-27 | 2019-01-02 | BOE Technology Group Co., Ltd. | Organic light emitting device and method for mounting |
-
1997
- 1997-05-12 JP JP9121227A patent/JPH10312882A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1120838B1 (en) * | 2000-01-27 | 2019-01-02 | BOE Technology Group Co., Ltd. | Organic light emitting device and method for mounting |
| KR100816277B1 (en) * | 2000-06-05 | 2008-03-24 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Display panel, display panel inspection method, and display panel manufacturing method |
| KR100816271B1 (en) * | 2000-06-05 | 2008-03-25 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Display panel, display panel inspection method, and display panel manufacturing method |
| US7741132B2 (en) | 2000-06-05 | 2010-06-22 | Semiconductor Energy Laboratory Co., Ltd. | Display panel, display panel inspection method, and display panel manufacturing method |
| TWI452745B (en) * | 2010-01-19 | 2014-09-11 | Panasonic Corp | Planar light emitting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3290375B2 (en) | Organic electroluminescent device | |
| JP3561549B2 (en) | Organic electroluminescence device | |
| US7224119B2 (en) | Device package with a thermoplastic encapsulation cap and device encapsulation method | |
| JPH11307264A (en) | Organic electroluminescent element | |
| JP3250561B1 (en) | Manufacturing method of organic EL element | |
| JP2004031324A (en) | Organic electroluminescence element | |
| JP2003243179A (en) | Organic electroluminescent element | |
| JPH11345687A (en) | Luminescent element | |
| JP2003123990A (en) | Organic electroluminescent element | |
| JP3553672B2 (en) | Organic electroluminescence device | |
| JP2003142252A (en) | Tubular light emitting device | |
| JP4310843B2 (en) | Method for manufacturing organic electroluminescent device | |
| US20060220535A1 (en) | Organic electroluminescent element and display device | |
| JP3651347B2 (en) | Organic electroluminescence device | |
| JP3775048B2 (en) | Organic light emitting device | |
| JP2000012237A (en) | Manufacture of organic electroluminescent display element | |
| JPH10312882A (en) | Organic electroluminescence element | |
| JP2001307871A (en) | Electroluminescent element | |
| JPH07166160A (en) | Organic thin film el element | |
| JP2001052857A (en) | Organic electroluminescent element and manufacture thereof | |
| US20050122041A1 (en) | Organic electroluminescent device | |
| KR100483165B1 (en) | Method of Making Organic Electro luminescent Display | |
| JP2003282249A (en) | Organic el panel and its manufacturing method | |
| JP2000348865A (en) | Organic electroluminescent element | |
| JP2004031211A (en) | Organic electroluminescent element |