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:
Jun. 02, 2020
Filed:
Mar. 09, 2015
Nemoto & Co., Ltd., Suginami-ku, JP;
Masashi Kato, Suginami-ku, JP;
Tomoya Sakaguchi, Suginami-ku, JP;
NEMOTO & CO., LTD., Suginami-ku, JP;
Abstract
A phosphorescent phosphor having a high afterglow luminance is provided. The phosphorescent phosphor comprises, as a matrix, a compound represented by MAlO, the metal element represented by M comprising Sr, Mg and Ba, and the phosphorescent phosphor containing, Eu as an activator, and Dy as a co-activator, wherein the content of Eu, in terms of molar ratio, is 0.001≤Eu/(M+Eu+Dy)≤0.05; the content of Dy, in terms of molar ratio, is 0.004≤Dy/(M+Eu+Dy)≤0.06; the content of Mg, in terms of molar ratio, is 0.02≤Mg/(M+Eu+Dy)≤0.1; the content of Ba, in terms of molar ratio, is 0.03≤Ba/(M+Eu+Dy)≤0.15; and the phosphorescent phosphor contains at least one alkali metal element of the group consisting of Li, Na, K and rubidium (Rb). Mg and Ba as well as the alkali metal element(s) contained in the phosphorescent phosphor provide an excellent phosphorescent phosphor having a high afterglow luminance.