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. 11, 2018
Filed:
Feb. 23, 2017
Nichia Corporation, Anan-shi, Tokushima, JP;
Kazushige Fujio, Tokushima, JP;
Masaki Kondo, Tokushima, JP;
NICHIA CORPORATION, Anan-shi, JP;
Abstract
A method for producing a fluorescent material is provided. The method includes preparing fluorescent material particles that contain an alkaline earth metal aluminate having a composition represented by (Sr,Eu)AlO, where x satisfies 0.05≤x≤0.4, and a part of Sr may be substituted by at least one element selected from the group consisting of Mg, Ca, Ba, and Zn; causing the prepared fluorescent material particles to come into contact with a liquid medium containing water; removing at least a portion of the contacted liquid medium to obtain purified fluorescent material particles; causing a phosphate compound to adhere to surfaces of the purified fluorescent material particles to obtain fluorescent material particles to which the phosphate compound is adhered; and heat treating the fluorescent material particles to which the phosphate compound is adhered at 500° C. to 700° C.