US 7,468,147 B2
Fluorescent substance and light-emitting device using the same
Naomi Shida, Tokyo (Japan); Masaaki Tamatani, Fujisawa (Japan); Yoshihito Tsutsui, Chigasaki (Japan); Kazuaki Ootsuka, Yokosuka (Japan); and Ryosuke Hiramatsu, Kawasaki (Japan)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Materials Co., Ltd., Kanagawa (Japan)
Filed on Oct. 13, 2005, as Appl. No. 11/249,946.
Claims priority of application No. 2004-303509 (JP), filed on Oct. 18, 2004.
Prior Publication US 2006/0081814 A1, Apr. 20, 2006
Int. Cl. C09K 11/59 (2006.01); C09K 11/55 (2006.01)
U.S. Cl. 252—301.4F  [428/403; 428/404; 428/405; 428/406; 428/407; 313/503; 257/98] 20 Claims
OG exemplary drawing
 
1. A fluorescent substance comprising an alkaline earth ortho-silicate, the fluorescent substance being activated by Eu2+, and further comprising at least one selected from the group consisting of La and Cs.