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. 14, 2014
Filed:
Feb. 05, 2009
Yuichi Sawada, Kitakyushu, JP;
Takahiro Kai, Kitakyushu, JP;
Masaki Komori, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Yuichi Sawada, Kitakyushu, JP;
Takahiro Kai, Kitakyushu, JP;
Masaki Komori, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Nippon Steel & Sumikin Chemical Co., Ltd., Tokyo, JP;
Abstract
Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, fully secured of driving stability, and of simple structure. The organic EL device comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate and the light-emitting layer comprises a phosphorescent dopant and a compound containing carbazolyl groups at both ends represented by the following formula (1) as a host material. In formula (1), X is independently CH optionally containing a substituent or N and L is a direct bond, an ethylene group, or an acetylene group.