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. 01, 2001
Filed:
Mar. 16, 1998
Applicant:
Inventors:
Toshio Sakai, Sodegaura, JP;
Hisahiro Higashi, Sodegaura, JP;
Hiroaki Nakamura, Sodegaura, JP;
Chishio Hosokawa, Sodegaura, JP;
Assignee:
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H05B 3/312 ;
U.S. Cl.
CPC ...
H05B 3/312 ;
Abstract
An organic EL device comprising a plurality of organic compound layers that include at least two or more organic light-emitting layers and are sandwiched between a pair of electrodes of anode and cathode, wherein two or more of these organic light-emitting layers are all doped with a fluorescent substance of the same type or the same color that constitutes the organic light-emitting layers. The device has a long life and high light-emitting efficiency.