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:
Jan. 31, 2012
Filed:
Oct. 31, 2007
Kazuaki Otsuka, Kanagawa-ken, JP;
Kazuaki Otsuka, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor light emitting device includes: a semiconductor light emitting element; a first phosphor which absorbs light emitted from the semiconductor light emitting element and emits first wavelength-converted light; and a second phosphor which absorbs light emitted from the semiconductor light emitting element and emits second wavelength-converted light. The first phosphor has a first excitation spectrum region where excitation intensity increases with increasing wavelength around a peak wavelength of the semiconductor light emitting element. The second phosphor has a second excitation spectrum region where excitation intensity is flat or decreases with respect to increasing wavelength around the peak wavelength of the semiconductor light emitting element.