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:
Aug. 03, 2015
Filed:
Mar. 08, 2012
Masahiro Gotoh, Tokyo, JP;
Akira Nagatomi, Tokyo, JP;
Kenji Sakane, Tokyo, JP;
Shuji Yamashita, Tokyo, JP;
Masahiro Gotoh, Tokyo, JP;
Akira Nagatomi, Tokyo, JP;
Kenji Sakane, Tokyo, JP;
Shuji Yamashita, Tokyo, JP;
DOWA ELECTRONICS MATERIALS CO., LTD., Tokyo, JP;
NICHIA CORPORATION, Anan-shi, JP;
Abstract
A phosphor, which has less reduction in emission efficiency and is capable of keeping high luminance even when density of an electron beam for exciting the phosphor increases, is provided. As raw materials, CaN(2N), AlN (3N), SiN(3N), and EuO(3N) are prepared, and each of the raw materials is weighed so that a mole ratio of each element is, for example, (Ca+Eu):Al:Si=1:1:1, and mixed, then the mixture is held and fired at 1500° C. under the inert atmosphere for three hours, and thereafter ground to produce a phosphor having a composition formula of CaSiAlN:Eu.