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:
May. 17, 2016
Filed:
May. 24, 2012
Shoji Takanashi, Ichikawa, JP;
Yuji Takatsuka, Ichikawa, JP;
Shoji Takanashi, Ichikawa, JP;
Yuji Takatsuka, Ichikawa, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
A method for producing film-coated alkaline-earth metal silicate phosphor particles that can have improved light-emitting characteristics may include a coating film having high moisture resistance. Strontium-containing alkaline-earth metal silicate phosphor particles are pretreated with an alkaline-earth metal compound solution whose strontium compound concentration is 1 to 15% by mass with respect to the phosphor particles and whose pH is 6 or higher but 10 or lower. Then, a base layer of an aluminum organic metal compound is formed on the surface of the pretreated phosphor particles. Then, the phosphor particles are coated with a coating material composed of a partially-hydrolyzed condensate of a silane organic metal compound, and are then dried and heat-treated to form, on their surface, a coating film made of an amorphous inorganic compound mainly containing Si and O.