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:
Sep. 06, 2022
Filed:
Mar. 24, 2020
Applicant:
Denka Company Limited, Tokyo, JP;
Inventors:
Tomohiro Nomiyama, Tokyo, JP;
Yusuke Takeda, Tokyo, JP;
Taiyo Yamaura, Tokyo, JP;
Tatsuya Okuzono, Tokyo, JP;
Masaru Miyazaki, Tokyo, JP;
Shintaro Watanabe, Tokyo, JP;
Assignee:
DENKA COMPANY LIMITED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 33/50 (2010.01); C09K 11/77 (2006.01);
U.S. Cl.
CPC ...
C09K 11/77348 (2021.01); H01L 33/502 (2013.01);
Abstract
A phosphor powder composed of α-sialon phosphor particles containing Eu. In a case where an internal quantum efficiency after the phosphor powder is held at 600° C. for 1 hour in an air atmosphere is defined as P1 and an internal quantum efficiency after the phosphor powder is held at 700° C. for 1 hour in an air atmosphere is defined as P2, P1 is equal to or more than 70% and (P1−P2)/P1×100 is equal to or less than 2.8%.