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. 12, 2004
Filed:
Dec. 19, 2002
Applicant:
Inventors:
Chikara Watatani, Tokyo, JP;
Yoshihiko Hanamaki, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 2/915 ;
U.S. Cl.
CPC ...
H01L 2/915 ;
Abstract
In a semiconductor light-emitting device, an active layer has a multi quantum well structure (MQW) barrier layers and quantum well layers alternately arranged. Each of the cladding layers has a multi quantum barrier structure (MQB) including barrier layers and well layers alternately arranged. The multi quantum barrier (MQB) of each of the cladding layers varies in a graded or stepwise form. Thus, charge carriers are prevented from overflowing from the active layer, preventing cut-off of a guided wave mode, increasing reflectance of electrons entering the energy barriers, and improving temperature characteristics.