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. 03, 2019
Filed:
Mar. 02, 2018
Nichia Corporation, Anan-shi, Tokushima, JP;
Tomokazu Yoshida, Anan, JP;
Shoji Hosokawa, Tokushima, JP;
Sadakazu Wakui, Tokushima, JP;
Toshiyuki Okazaki, Tokushima, JP;
NICHIA CORPORATION, Anan-shi, JP;
Abstract
A method for producing a fluoride fluorescent material including: preparing a first solution containing manganese, a second solution containing at least one cation selected from the group consisting of K, Li, Na, Rb, Cs, and NH, and a third solution containing at least one element selected from the group consisting of the elements from Groups 4 and 14 of the periodic table, and adding the first and third solutions dropwise, each at a rate of 0.3% or less of the total volume of the solution per minute to the second solution to obtain particles having a composition represented by formula (I): A[MMnF] (I) wherein A denotes at least one cation selected from the group consisting of K, Li, Na, Rb, Cs, and NH; M denotes at least one element selected from the group consisting of the elements from Groups 4 and 14 of the periodic table; and a satisfies 0.04<a<0.20.