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:
May. 13, 2014
Filed:
Feb. 25, 2010
Takahiro Kai, Kitakyushu, JP;
Hideki Tanaka, Kitakyushu, JP;
Mitsuru Suda, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Megumi Matsumoto, Kitakyushu, JP;
Takahiro Kai, Kitakyushu, JP;
Hideki Tanaka, Kitakyushu, JP;
Mitsuru Suda, Kitakyushu, JP;
Toshihiro Yamamoto, Kitakyushu, JP;
Megumi Matsumoto, Kitakyushu, JP;
Nippon Steel & Sumikin Chemical Co., Ltd., Tokyo, JP;
Abstract
Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, fully secured of high driving stability, and of a simple structure. The organic EL device is constituted of an anode, organic layers containing a phosphorescent light-emitting layer, and a cathode piled one upon another on a substrate and a phosphine oxide derivative represented by general formula (1) is contained in a phosphorescent light-emitting layer, an electron-transporting layer, a hole-blocking layer, or an exciton-blocking layer. In general formula (1), Lis a direct bond or an aromatic group with a valence of 1-3 and Aris an aromatic group. The two Argroups linked to the same nitrogen atom may form a nitrogen heterocycle and may further form a fused ring together with the said nitrogen heterocycle.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile