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:
Jul. 03, 2007
Filed:
Aug. 27, 2004
Kojiro Okuyama, Ikoma, JP;
Takehiro Zukawa, Katano, JP;
Masahiro Sakai, Yawata, JP;
Seigo Shiraishi, Neyagawa, JP;
Kazuhiko Sugimoto, Kyoto, JP;
Masaki Aoki, Mino, JP;
Junichi Hibino, Kyoto, JP;
Kojiro Okuyama, Ikoma, JP;
Takehiro Zukawa, Katano, JP;
Masahiro Sakai, Yawata, JP;
Seigo Shiraishi, Neyagawa, JP;
Kazuhiko Sugimoto, Kyoto, JP;
Masaki Aoki, Mino, JP;
Junichi Hibino, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Phosphor and a plasma display device are provided whose deterioration in brightness of phosphors and a degree of change in chromaticity are alleviated and whose discharge characteristics are improved and that has excellent initial characteristics. Phosphor of the present invention is an alkaline-earth metal aluminate phosphor containing an element M (where M denotes at least one type of element selected from the group consisting of Nb, Ta, W and B). In this phosphor, a concentration of M in the vicinity of a surface of the phosphor particles is higher than the average concentration of M in the phosphor particles as a whole. A plasma display device according to the present invention includes a plasma display panel in which a plurality of discharge cells in one color or in a plurality of colors are arranged and phosphor layers are arranged so as to correspond to the discharge cells in colors and in which light is emitted by exciting the phosphor layers with ultraviolet rays. The phosphor layers include blue phosphor, where the afore-mentioned phosphor is used as the blue phosphor.