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:
May. 19, 2009
Filed:
Apr. 30, 2004
Naoki Ohashi, Ibaraki, JP;
Takamasa Ishigaki, Ibaraki, JP;
Hiroyuki Taguchi, Ibaraki, JP;
Isao Sakaguchi, Ibaraki, JP;
Hajime Haneda, Ibaraki, JP;
Takashi Sekiguchi, Ibaraki, JP;
Naoki Ohashi, Ibaraki, JP;
Takamasa Ishigaki, Ibaraki, JP;
Hiroyuki Taguchi, Ibaraki, JP;
Isao Sakaguchi, Ibaraki, JP;
Hajime Haneda, Ibaraki, JP;
Takashi Sekiguchi, Ibaraki, JP;
National Institute for Materials Science, Tsukuba-shi, JP;
Abstract
The present invention relates to a zinc oxide phosphor characterized by emitting visible light with a broad emission spectrum close to white, and a process for producing the same. A powder prepared by adding a plurality of additives to zinc oxide and heat-treating the resulting mixture is further hydrogenated to improve the luminous efficiency of the zinc oxide phosphor. The zinc oxide phosphor providing a broad emission spectrum covering a wavelength range over substantially the entire visible region can be applied to a white diode, a white vacuum fluorescent display, and a fluorescent paint.