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:
Feb. 15, 2011
Filed:
Feb. 15, 2005
Applicants:
Toshihiro Iwakuma, Sodegaura, JP;
Masahide Matsuura, Sodegaura, JP;
Hiroshi Yamamoto, Sodegaura, JP;
Hisayuki Kawamura, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Inventors:
Toshihiro Iwakuma, Sodegaura, JP;
Masahide Matsuura, Sodegaura, JP;
Hiroshi Yamamoto, Sodegaura, JP;
Hisayuki Kawamura, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Assignee:
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 51/52 (2006.01);
U.S. Cl.
CPC ...
Abstract
An organic electroluminescent device including at least an anode, a first emitting layer, a hole barrier layer, a second emitting layer and a cathode in this order. The first emitting layer and the second emitting layer both include a hole transporting material. The organic EL device is small in chromaticity change and has high efficiency.