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. 24, 2013
Filed:
Mar. 04, 2008
Shin-ichi Sakata, Yamaguchi, JP;
Hiroshi Oda, Yamaguchi, JP;
Takuma Sakai, Yamaguchi, JP;
Ube Industries, Inc., , JP;
Abstract
A practical novel phosphor material composed of an α-type silicon nitride, i.e., an α-type silicon nitride phosphor containing a fluorescence-emittable element throughout an α-type silicon nitride particle from the surface to the inside, is provided. Portions having a high emittable element concentration are preferably present like islands, and the fluorescence-emittable element is preferably a lanthanide metal. A powder composed of a fluorescence-emittable element is added to silicon diimide (Si(NH)) or an amorphous silicon nitride powder obtained by thermally decomposing silicon diimide (Si(NH)), the powders are mixed, and the mixture is fired in a non-oxidizing atmosphere, whereby the phosphor material is obtained.