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:
Feb. 05, 2013
Filed:
Jul. 11, 2011
Kojiro Okuyama, Nara, JP;
Yayoi Kitamura, Osaka, JP;
Seigo Shiraishi, Osaka, JP;
Kazuhiko Sugimoto, Osaka, JP;
Mituru Harada, Osaka, JP;
Kojiro Okuyama, Nara, JP;
Yayoi Kitamura, Osaka, JP;
Seigo Shiraishi, Osaka, JP;
Kazuhiko Sugimoto, Osaka, JP;
Mituru Harada, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention provides a blue phosphor that exhibits high luminance and shows less luminance degradation during driving of a light-emitting device. The present invention is a blue phosphor represented by the general formula aBaO.bSrO.(1−a−b)EuO.cMgO.dAlO.eWO, where 0.70≦a≦0.95, 0≦b≦0.15, 0.95≦c≦1.15, 9.00≦d≦11.00, 0.001≦e≦0.100, and a+b≦0.97 are satisfied. In this blue phosphor, two peaks whose tops are located in a range of diffraction angle 2θ=13.0 to 13.6 degrees are present in an X-ray diffraction pattern obtained by measurement on the blue phosphor using an X-ray with a wavelength of 0.774 Å.