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. 06, 2007
Filed:
Aug. 20, 2004
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;
Abstract
A phosphor with high efficiency having an excitation band corresponding to light of the ultraviolet-visible (300 to 550 nm) wavelength region emitted from a light emitting element which emits blue or ultraviolet light is provided. Commercially available CaO [3N], SiN[3N], and EuO[3N] are prepared, respective materials are weighed and mixed to have a mol ratio of CaO:SiN:EuO=1.4775:1:0.01125, and then the mixture is heated to 1600° C. by a heating rate of 15° C./min under a nitrogen atmosphere and retained and fired at 1600° C. for three hours. Thereafter, the raw materials are cooled down from 1600° C. to 200° C. for an hour to thereby produce a phosphor having a composition formula CaSiON:Eu.