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:
Aug. 09, 2011
Filed:
Nov. 22, 2006
Masaki Komori, Fukuoka, JP;
Toshihiro Yamamoto, Fukuoka, JP;
Takahiro Kai, Fukuoka, JP;
Masanori Hotta, Fukuoka, JP;
Masaki Komori, Fukuoka, JP;
Toshihiro Yamamoto, Fukuoka, JP;
Takahiro Kai, Fukuoka, JP;
Masanori Hotta, Fukuoka, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Abstract
Disclosed are an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, fully secured of driving stability, and simple in constitution and a compound for use therein. The organic electroluminescent device comprises a light-emitting layer disposed between an anode and a cathode piled one upon another on a substrate and the light-emitting layer contains a phosphorescent dopant and a compound for use in an organic electroluminescent device having two or more indolocarbazole skeletons as a host material. An example of the compound having indolocarbazole skeletons for use in the device is expressed by the following formula.