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:
Oct. 05, 1999
Filed:
Jul. 14, 1998
Akitaka Kimura, Tokyo, JP;
Chiaki Sasaoka, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnesium-doped semiconductor layer expressed by general formula Al.sub.x Ga.sub.1-x N (where 0.ltoreq.x.ltoreq.1) is formed on a substrate. Thereafter, on the semiconductor layer, a plurality of semiconductor layers (including an activation layer) expressed by general formula In.sub.x Al.sub.y Ga.sub.1-x-y N (where 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, 0.ltoreq.x+y.ltoreq.1) are formed. The crystalline characteristics of semiconductor layers including a light emitting layer of a gallium nitride semiconductor light emitting device having a magnesium-doped gallium nitride semiconductor layer are good. Thus, in the case that the light emitting device is a laser device, it can be expected that the oscillating threshold value of the laser device becomes low. In the case that the light emitting device is a light emitting diode, it can be expected that the light emitting efficiency of the light emitting diode becomes high.