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. 16, 2021
Filed:
Dec. 23, 2019
Applicant:
Nichia Corporation, Anan, JP;
Inventor:
Tomokazu Yoshida, Anan, JP;
Assignee:
NICHIA CORPORATION, Anan, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 11/67 (2006.01); H01L 33/50 (2010.01);
U.S. Cl.
CPC ...
C09K 11/677 (2013.01); H01L 33/502 (2013.01); H01L 33/507 (2013.01); H01L 2933/0041 (2013.01);
Abstract
A fluoride fluorescent material includes a composition including K, Ge, Mn, and F and having a molar ratio of K of 2, a total molar ratio of Ge and Mnof 1, a molar ratio of Mnof more than 0 and less than 0.2, and a molar ratio of F of 6 in 1 mol of the composition, has a light emission spectrum having a first light emission peak in a range of 615 nm or more and less than 625 nm having a full width at half maximum of 6 nm or less, and a second light emission peak in a range of 625 nm or more and less than 635 nm, and has an internal quantum of 85% or more efficiency under excitation of light having a wavelength of 450 nm.