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:
Mar. 01, 2005
Filed:
Aug. 28, 2002
Applicants:
Shuit-tong Lee, Hong Kong, CN;
Chun-sing Lee, Hong Kong, CN;
Peng-fei Wang, Hong Kong, CN;
Zhi-yuan Xie, Hong Kong, CN;
Inventors:
Shuit-Tong Lee, Hong Kong, CN;
Chun-Sing Lee, Hong Kong, CN;
Peng-Fei Wang, Hong Kong, CN;
Zhi-Yuan Xie, Hong Kong, CN;
Assignee:
CityU Research Ltd., Hong Kong, CN;
Primary Examiner:
Int. Cl.
CPC ...
H05B033/12 ;
U.S. Cl.
CPC ...
Abstract
An organic electroluminescence device which includes an anode, a cathode, a hole transport layer, an electron transport layer, and at least one organic luminescent medium doped with a pyrazolo[3,4b]quinoxaline derivative is disclosed. The present device provides improved efficiency, and the emission band associated therewith is surprisingly narrow. The improved green emitting organic electroluminescence device exhibits high color purity.