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Electroluminescent-element

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Electroluminescent element

Details

Inventors: Shinkai, Masanao; Namiki, Tohru; Nakada, Hitoshi; Wakimoto, Takeo; Murayama, Ryuji; Matsunaga, Daisaku;
Assignee: Pioneer Electronic Corporation (Tokyo, JP); Nippon Kayaku Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Seidleck; James J.
Assistant Examiner:
Attorney, Agent or Firm: Foley & Lardner

The electroluminescent element of the present invention comprises a fluorescent substance layer containing a courmarinic or azacoumarinic derivative and a hole transport layer, both made of organic compounds and laminated on top of the other. The both layers are interposed between cathode and anode electrodes. It emits light efficiently at a high luminance upon application of a low voltage between the electrodes.

DETAILED DESCRIPTION It is an object of the present invention to provide electroluminescent elements which permit the fluorescent substances to efficiently emit light and high luminance.
The gist of the present invention resides in an electroluminescent element of the type having a fluorescent substance layer of organic compound and a hole transport layer of organic compound which are laminated on top of the other and interposed between the cathode and anode, wherein the fluorescent substance layer comprises a fluorescent substance thin film containing a coumarinic or azacoumarinic derivative.

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