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:
Nov. 29, 2022
Filed:
Sep. 25, 2020
Applicant:
Nichia Corporation, Anan, JP;
Inventors:
Kenichi Aoyagi, Itano-gun, JP;
Takashi Kaide, Anan, JP;
Yuya Takahashi, Myozai-gun, JP;
Shoji Hosokawa, Tokushima, JP;
Assignee:
NICHIA CORPORATION, Anan, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 11/77 (2006.01); C01F 17/30 (2020.01); C09K 11/08 (2006.01); C01B 21/082 (2006.01);
U.S. Cl.
CPC ...
C09K 11/7734 (2013.01); C01B 21/0826 (2013.01); C01F 17/30 (2020.01); C09K 11/0883 (2013.01); C09K 11/77348 (2021.01);
Abstract
Provided a method of producing a β-sialon fluorescent material having excellent emission intensity. The method includes providing a first composition containing aluminum, an oxygen atom, and a europium-containing silicon nitride, heat treating the first composition, contacting the heat-treated composition and a basic substance to obtain a second composition, and contacting the second composition resulting from contacting the heat-treated composition with the basic substance and an acidic liquid medium containing an acidic substance.