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. 23, 1999
Filed:
Nov. 06, 1997
Koichi Hasegawa, Chichibu, JP;
Koichiro Takahashi, Chichibu, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
An epitaxial wafer for a GaP pure green light emitting diode includes an n-type single crystal GaP substrate formed in order thereon with a first n-type GaP epitaxial layer, a second n-type GaP epitaxial layer and a p-type GaP epitaxial layer. The p-type GaP epitaxial layer has a sulfur concentration of not greater than 1.times.10.sup.17 cm.sup.31 3, the second n-type GaP epitaxial layer has a carrier concentration on a side thereof interfacing with the p-type GaP epitaxial layer of 0.5-5.times.10.sup.17 cm.sup.-3, and the p-type GaP epitaxial layer has a carrier concentration on a side thereof interfacing with the second n-type GaP epitaxial layer that is 1-10.times.10.sup.17 cm.sup.-3 and is not less than twice the carrier concentration of the second n-type GaP epitaxial layer on the side thereof interfacing with the p-type GaP epitaxial layer. A GaP pure green light-emitting diode exhibiting high brightness includes the epitaxial wafer, an n-type electrode provided on a back surface of the single crystal substrate and a p-type electrode provided on the upper surface of the p-type GaP epitaxial layer.