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. 09, 2013
Filed:
Nov. 12, 2010
Applicants:
Tetsuji Fujita, Chino, JP;
Hidetoshi Yamamoto, Suwa, JP;
Shinichi Iwata, Chino, JP;
Koji Yasukawa, Suwa, JP;
Inventors:
Tetsuji Fujita, Chino, JP;
Hidetoshi Yamamoto, Suwa, JP;
Shinichi Iwata, Chino, JP;
Koji Yasukawa, Suwa, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 27/15 (2006.01); H01L 31/12 (2006.01); H01L 33/00 (2010.01);
U.S. Cl.
CPC ...
Abstract
A light-emitting element has a cathode, an anode, a light-emitting portion interposed between the cathode and the anode and having a light-emitting layer that emits light on energization between the cathode and the anode, and a hole-injection layer interposed between and in direct contact with the anode and the light-emitting layer and having a capability of receiving holes, and the hole-injection layer is mainly composed of a benzidine derivative.