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. 09, 2010
Filed:
Dec. 08, 2008
Yoshinori Murazaki, Anan, JP;
Shinpei Kinoshita, Anan, JP;
Masatoshi Kameshima, Anan, JP;
Suguru Takashima, Anan, JP;
Hiroto Tamaki, Anan, JP;
Yoshinori Murazaki, Anan, JP;
Shinpei Kinoshita, Anan, JP;
Masatoshi Kameshima, Anan, JP;
Suguru Takashima, Anan, JP;
Hiroto Tamaki, Anan, JP;
Nichia Corporation, Anan-shi, JP;
Abstract
A fluorescent material includes first and second phosphors. The first phosphor is a light-storing phosphor, which is represented by the general formula (MEuQ)AlO, wherein M is one type selected from the group consisting of Mg, Ca, Ba, Sr and Zn; Q is one type selected from the group consisting of Pr, Nd, Dy, Er and Ho; a is a number that satisfies 0.0001≦a≦0.5; and b is a number that satisfies 0.010≦b≦0.5. When the fluorescent material is excited for about 15 minutes by ultraviolet irradiation having about 365.0 nm wavelength with an intensity of 0.5 mW/cm, and the color of the afterglow of the fluorescent material is measured 1 minute and 10 minutes after excitation is terminated, an amount of change between chromaticity measured 1 minute after excitation and that measured 10 minutes is in the range of −0.001≦x≦0.009 and −0.009≦y≦0.006.