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:
Jul. 24, 2012
Filed:
Aug. 28, 2008
Tomo Kikuchi, Chichibu, JP;
Takashi Udagawa, Chichibu, JP;
Tomo Kikuchi, Chichibu, JP;
Takashi Udagawa, Chichibu, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
In a Group III nitride semiconductor light-emitting device which includes a substrate () and a light-emitting layer () having a multiple quantum well structure including a barrier layer (), which is provided on a surface of the substrate and formed of a Group III nitride semiconductor, and a well layer () formed of an indium-containing Group III nitride semiconductor, the light-emitting layer is constituted by stacking a plurality of multilayer portions () which have one unit multilayer portion () including the well layer and the barrier layer or two or more stacked unit multilayer portions (). When the multilayer portion () includes two or more unit multilayer portions (), the respective well or barrier layers have the same thickness and composition, and in the respective multilayer portions (), the barrier layers of the unit multilayer portions are different in thickness with respect to one another.