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:
Dec. 13, 1994
Filed:
Jul. 21, 1993
Yasuhito Takahashi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A blue light emitting semiconductor device includes a first cladding layer, a second cladding layer, and an active layer. The first cladding layer includes a Group II-VI compound semiconductor of a first conduction type. The second cladding layer includes a Group II-VI compound semiconductor of a second conduction type different from the first conduction type. The active layer includes a Group II-VI compound semiconductor of the second conduction type, and extends between the first and second cladding layers a substrate includes a Group III-V compound semiconductor. At least two laminated buffer layers including Group III-V compound semiconductors extend between the first cladding layer and the substrate. An energy band gap at a position in the substrate, the buffer layers, and the first cladding layer varies stepwise as the position moves from the substrate to the first cladding layer via the buffer layers.