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:
Apr. 14, 2009
Filed:
Mar. 23, 2006
Koutoku Ohmi, Tottori, JP;
Makoto Higuchi, Hida, JP;
Jun-ichi Itoh, Ageo, JP;
Tomoyasu Yano, Ageo, JP;
Asuka Sasakura, Ageo, JP;
Koutoku Ohmi, Tottori, JP;
Makoto Higuchi, Hida, JP;
Jun-ichi Itoh, Ageo, JP;
Tomoyasu Yano, Ageo, JP;
Asuka Sasakura, Ageo, JP;
Tottori University, Tottori, JP;
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Abstract
A method for producing a blue phosphor, comprising firing a mixture for 2 to 24 hours at a temperature of 800° C. or higher in an atmosphere of hydrogen sulfide, carbon disulfide, or an inert gas, the mixture containing a barium compound component, a silicon compound component, and a cerium compound component in quantitative proportions such that the atomic ratios of the components fulfill the equations 0.50<Si/Ba≦0.70 and 0.0005 ≦Ce/Ba≦0.03, or the mixture further containing a sulfur compound component in addition to these components. The blue phosphor has high color purity, high luminance, high chemical stability, and a low crystallization temperature, and is suitable for use in displays such as FED, PDP, and EL displays, or for use in the excitation of near-ultraviolet LED.