The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 2010
Filed:
Nov. 25, 2004
Osamu Yoshitake, Fukuoka, JP;
Hiroshi Miyazaki, Fukuoka, JP;
Toshihiro Yamamoto, Fukuoka, JP;
Daisuke Suzaki, Kagawa, JP;
Yu Yamada, Tokyo, JP;
Sadao Kamimura, Kagawa, JP;
Osamu Yoshitake, Fukuoka, JP;
Hiroshi Miyazaki, Fukuoka, JP;
Toshihiro Yamamoto, Fukuoka, JP;
Daisuke Suzaki, Kagawa, JP;
Yu Yamada, Tokyo, JP;
Sadao Kamimura, Kagawa, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Abstract
Provided is an organic electroluminescent device which is suitable for use in full-color and multicolor panels and shows higher luminous efficiency and better driving stability than organic electroluminescent devices utilizing luminescence from the singlet state. The organic electroluminescent device comprises a substrateand an anode, organic layers, and a cathodepiled one upon another on the substrate, at least one of the organic layers comprises a light-emitting layercontaining a host material and a dopant material, and a compound having 2 to 4 pyrazole structures represented by the following formula I (wherein Arto Arare independently hydrogen or substituted or unsubstituted aromatic hydrocarbon groups or aromatic heterocyclic groups) is used as said host material.