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:
Feb. 16, 2021
Filed:
Dec. 27, 2016
Denka Company Limited, Tokyo, JP;
Shintaro Watanabe, Fukuoka, JP;
Yusuke Takeda, Fukuoka, JP;
DENKA COMPANY LIMITED, Tokyo, JP;
Abstract
An object of the present invention is to provide a red phosphor having improved luminance. A further object of the present invention is to provide a light emitting device having higher luminance by using the red phosphor. There is provided a phosphor having the main crystal phase represented by the general formula: MAlSiNin which the M element(s) represent one or more elements selected from the group consisting of Mg, Ca, Sr, and Ba, the main crystal phase being composed of only CaAlSiNor having the same crystal structure as that of CaAlSiN, and some of the M element(s) being substituted with an Eu element, wherein the phosphor contains W (tungsten) in an amount of 3 ppm or more and 500 ppm or less, based on the total mass of the phosphor.