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Organic electroluminescence device emitting white light

a technology of electroluminescence device and white light, which is applied in the direction of luminescence screen of discharge tube, other domestic articles, natural mineral layered products, etc., can solve the problems of not meeting the requirements of practical application with respect to the efficiency of light emission and li

Inactive Publication Date: 2005-01-27
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention has an object of providing an organic EL device emitting white light which emits white light and exhibits properties sufficient for practical applications, i. e., a high efficiency of light emission of 5 lumen / W or greater and 5 cd / A or greater and a long life of 10,000 hours or longer.
As the result of extensive studies by the present inventors to achieve the above object, it was found that, when the layer of a light emitting medium comprises a light emitting material emitting blue light and a fluorescent compound having at least one structure selected from the fluoranthene skeleton structure, the pentacene structure and the perylene structure, an organic EL device comprising this layer of a light emitting medium disposed between a pair of electrodes has a high efficiency of light emission and a long life and emits white light. The present invention has been completed based on this knowledge.

Problems solved by technology

No devices sufficiently satisfy the requirements for practical application with respect to the efficiency of light emission and the life.

Method used

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  • Organic electroluminescence device emitting white light
  • Organic electroluminescence device emitting white light
  • Organic electroluminescence device emitting white light

Examples

Experimental program
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Effect test

example 1

Preparation of an Organic EL Device (An Example of the First Construction: the Fluoranthene Skeleton Structure)

A glass substrate of 25 mm×75 mm×1.1 mm thickness having a transparent electrode line of ITO (In—Sn—O) (manufactured by GEOMATEC Company) was cleaned with isopropyl alcohol for 5 minutes under application of ultrasonic wave and treated by the UV ozone cleaning for 30 minutes. The cleaned glass substrate having a transparent electrode line was attached to a substrate holder in a vacuum vapor deposition apparatus. On the face of the substrate on which the transparent electrode line was disposed, a film of N,N′-bis(N,N′-diphenyl-4-aminphenyl)-N,N-diphenyl-4,4′-diamino-1,1′-biphenyl (a TPD232 film) having a thickness of 60 nm was formed in a manner such that the film covered the transparent electrode line. The TPD232 film worked as the hole injecting layer. Then, a film of 4,4′-bis[N-(l-naphthyl)-N-phenylamino]biphenyl (an NPD film) having a thickness of 20 nm was formed on t...

example 2

Preparation of an Organic EL Device (An Example of the Second Construction: the Fluoranthene Skeleton Structure)

A glass substrate of 25 mm×75 mm×1.1 mm thickness having a transparent electrode line of ITO (In—Sn—O) (manufactured by GEOMATEC Company) was cleaned with isopropyl alcohol for 5 minutes under application of ultrasonic wave and treated by the UV ozone cleaning for 30 minutes. The cleaned glass substrate having a transparent electrode line was attached to a substrate holder in a vacuum vapor deposition apparatus. On the face of the substrate on which the transparent electrode line was disposed, a TPD232 film having a thickness of 60 nm was formed in a manner such that the film covered the transparent electrode line. The TPD232 film worked as the hole injecting layer. Then, an NPD film having a thickness of 20 nm was formed on the TPD232 film. When the NPD film was formed, the fluorescent compound described above (E1) was added in an amount such that the amounts by weight ...

example 3

Preparation of an Organic EL Device (An Example of the Third Construction: the Fluoranthene Skeleton Structure)

A glass substrate of 25 mm×75 mm×1.1 mm thickness having a transparent electrode line of ITO (In—Sn—O) (manufactured by GEOMATEC Company) was cleaned with isopropyl alcohol for 5 minutes under application of ultrasonic wave and treated by the UV ozone cleaning for 30 minutes. The cleaned glass substrate having a transparent electrode line was attached to a substrate holder in a vacuum vapor deposition apparatus. On the face of the substrate on which the transparent electrode line was disposed, a TPD232 film having a thickness of 60 nm was formed in a manner such that the film covered the transparent electrode line. The TPD232 film worked as the hole injecting layer. Then, an NPD film having a thickness of 20 nm was formed on the TPD232 film. The NPD film worked as the hole transporting layer. On the NPD film, the fluorescent compound (El) described above was vapor deposit...

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Abstract

An organic electroluminescence device emitting white light which emits white light and exhibits properties sufficient for practical applications, i.e., a high efficiency of light emission and a long life, is provided. The organic electroluminescence device emitting white light comprises a pair of electrodes and a layer of a light emitting medium disposed between the pair of electrodes, wherein the layer of a light emitting medium comprises a light emitting material emitting blue light and a fluorescent compound having at least one structure selected from a fluoranthene skeleton structure, a pentacene skeleton structure and a perylene skeleton structure.

Description

TECHNICAL FIELD The present invention relates to an organic electroluminescence device (hereinafter, electroluminescence will be referred to as EL) emitting while light and, more particularly, to an organic EL device having a high efficiency and a long life and emitting white light. BACKGROUND ART Electroluminescence devices which utilize electroluminescence show high self-distinguishability because of the self-emission and are excellent in impact resistance because they are completely solid devices. Therefore, electroluminescence devices have been attracting attention for application as light emitting devices in various types of display apparatus. The electroluminescence devices include inorganic electro-luminescence devices in which an inorganic compound is used as the light emitting material and organic electroluminescence devices in which an organic compound is used as the light emitting material. Organic electroluminescence devices have been extensively studied for practical...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K11/06H05B33/12H05B33/14H10K99/00
CPCC09K11/06Y10S428/917C09K2211/1007C09K2211/1011C09K2211/1014H01L51/005H01L51/0052H01L51/0054H01L51/0055H01L51/0056H01L51/0058H01L51/0059H01L51/006H01L51/0081H01L51/5012H01L51/5036H01L2251/308H05B33/14Y02B20/181C09K2211/1003Y02B20/00H10K85/60H10K85/623H10K85/624H10K85/615H10K85/622H10K85/631H10K85/626H10K85/633H10K85/324H10K50/125H10K50/11H10K2102/103
Inventor FUKUOKA, KENICHITAGAMI, SANAEHOSOKAWA, CHISHIO
Owner IDEMITSU KOSAN CO LTD
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