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:
Nov. 29, 2011
Filed:
Apr. 19, 2010
Kenji Sakane, Tokyo, JP;
Akira Nagatomi, Tokyo, JP;
Masahiro Gotoh, Tokyo, JP;
Shuji Yamashita, Tokyo, JP;
Kenji Sakane, Tokyo, JP;
Akira Nagatomi, Tokyo, JP;
Masahiro Gotoh, Tokyo, JP;
Shuji Yamashita, Tokyo, JP;
Dowa Electronics Materials Co., Ltd., Tokyo, JP;
Nichia Corporation, Anan-shi, JP;
Abstract
To provide a phosphor having an emission characteristic such that a peak wavelength of light emission is in a range from 580 to 680 nm, and having a high emission intensity, and having a flat excitation band with high efficiency for excitation light in a broad wavelength range from ultraviolet to visible light (wavelength range from 250 nm to 550 nm). For example, CaN(2N), AlN(3N), SiN(3N), EuO(3N) are prepared, and after weighing and mixing a predetermined amount of each raw material, raw materials are fired at 1500° C. for 6 hours, thus obtaining the phosphor including a product phase expressed by a composition formula CaAlSiN:Eu and having an X-ray diffraction pattern satisfying a predetermined pattern.