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:
Apr. 22, 2014
Filed:
Apr. 30, 2009
Toshihiro Yamamoto, Kitayushu, JP;
Takahiro Kai, Kitakyushu, JP;
Masaki Komori, Kitakyushu, JP;
Taishi Tsuji, Tsurugashima, JP;
Yasuhiro Takahashi, Tsurugashima, JP;
Toshinao Yuki, Yonezawa, JP;
Yusuke Nakajima, Yonezawa, JP;
Tomoaki Hoshi, Yonezawa, JP;
Jiro Asaka, Yonezawa, JP;
Toshihiro Yamamoto, Kitayushu, JP;
Takahiro Kai, Kitakyushu, JP;
Masaki Komori, Kitakyushu, JP;
Taishi Tsuji, Tsurugashima, JP;
Yasuhiro Takahashi, Tsurugashima, JP;
Toshinao Yuki, Yonezawa, JP;
Yusuke Nakajima, Yonezawa, JP;
Tomoaki Hoshi, Yonezawa, JP;
Jiro Asaka, Yonezawa, JP;
Nippon Steel & Sumikin Chemical Co., Ltd., Tokyo, JP;
Pioneer Corporation, Kawasaki-Shi, JP;
Tohoku Pioneer Corporation, Tendo-Shi, JP;
Abstract
Disclosed is an organic electroluminescent device (organic EL device) that is improved in the luminous efficiency, fully secured of the driving stability, and of a 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 said light-emitting layer comprises (A) a phosphorescent dopant whose emission peak wavelength is longer than 600 nm and (B) a host material. The host material contains at least two kinds of compounds selected from two or more kinds of derivatives included in (b1) N-substituted indolocarbazole derivatives, (b2) derivatives of 8-hydroxyquinoline aluminum complex, and (b3) bisindolocarbazole derivatives.