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:
Mar. 10, 2015
Filed:
Aug. 31, 2012
Keiko Albessard, Yokohama, JP;
Masahiro Kato, Naka-gun, JP;
Yumi Fukuda, Tokyo, JP;
Iwao Mitsuishi, Machida, JP;
Takahiro Sato, Kawasaki, JP;
Shigeya Kimura, Yokohama, JP;
Aoi Okada, Kawasaki, JP;
Naotoshi Matsuda, Chigasaki, JP;
Ryosuke Hiramatsu, Yokohama, JP;
Yasushi Hattori, Kawasaki, JP;
Kunio Ishida, Fuchu, JP;
Hironori Asai, Yokohama, JP;
Keiko Albessard, Yokohama, JP;
Masahiro Kato, Naka-gun, JP;
Yumi Fukuda, Tokyo, JP;
Iwao Mitsuishi, Machida, JP;
Takahiro Sato, Kawasaki, JP;
Shigeya Kimura, Yokohama, JP;
Aoi Okada, Kawasaki, JP;
Naotoshi Matsuda, Chigasaki, JP;
Ryosuke Hiramatsu, Yokohama, JP;
Yasushi Hattori, Kawasaki, JP;
Kunio Ishida, Fuchu, JP;
Hironori Asai, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, the luminescent material shows a luminescence peak in a wavelength range of 570 to 670 nm when excited with light having an emission peak in a wavelength range of 250 to 520 nm. The luminescent material includes a host material having a crystal structure substantially same as the crystal structure of SrSiAlON. The host material is activated by Eu, and includes Sr and Ca to satisfy a relationship of 0.008≦M/(M+M)≦0.114, where Mis a number of moles of Ca and Mis a number of moles of Sr.