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:
Oct. 12, 2004
Filed:
Sep. 25, 2001
Kenji Toda, Niigata-shi, Niigata, JP;
Mineo Sato, Igarashiichino-machi, Niigata-shi, Niigata, JP;
Keiji Ono, Tsukuba-shi, Ibaraki, JP;
Susumu Miyazaki, Kitasoma-gun, Ibaraki, JP;
Takashi Takeda, Tsukuba-shi, Ibaraki, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A fluorescent substance for vacuum ultraviolet radiation excited light-emitting devices which emits light with a high luminance and is subject to only a small decrease in luminance due to exposure to plasma or the like, and a vacuum ultraviolet radiation excited light-emitting device including the fluorescent substance are provided. The fluorescent substance is represented by the general formula: mM O·nM O·2M O wherein M is at least one metal selected from the group consisting of Ca, Sr and Ba, M is at least one metal selected from the group consisting of Mg and Zn, M is at least one metal selected from the group consisting of Si and Ge, and m and n satisfy 0.5≦m≦3.5 and 0.5≦n≦2.5, respectively. Either Eu and Mn can be used as an activator.