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:
Jan. 15, 2002
Filed:
Aug. 23, 1999
Applicant:
Inventor:
Kenji Nakaya, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/749 ;
U.S. Cl.
CPC ...
H01J 1/749 ;
Abstract
In an organic EL device comprising on a substrate ( ), a hole injecting electrode ( ), an organic layer ( ) having a light emitting function, a buffer layer ( ), and an electron injecting electrode ( ), the electron injecting electrode ( ) is constructed of a metal, metal oxide or metal halide, especially Al—Li alloy, and the buffer layer ( ) is constructed of a porphyrin or naphthacene compound. The device can be manufactured without damages to the organic layer and has a low initial drive voltage, a low emission start voltage, a high efficiency, and minimized dark spot growth and hence a long lifetime.