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:
Dec. 31, 2019
Filed:
Jun. 07, 2016
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Ryosuke Hiramatsu, Yokohama, JP;
Jun Tamura, Yokohama, JP;
Kunio Ishida, Fuchu, JP;
Keiko Albessard, Yokohama, JP;
Masahiro Kato, Naka, JP;
Kabushiki Kaisha Toshiba, Minato-Ku, JP;
Toshiba Materials Co., Ltd., Yokohama-Shi, JP;
Abstract
A red-light emitting phosphor is provided, having a basic composition represented by K(Si,Mn)Fand also having a particular Raman spectrum, wherein the intensity ratio I/I, which is a ratio of (I) the peak in a Raman shift of 600±10 cmassigned to Mn—F bonds in the crystal to that (I) in a Raman shift of 650±10 cmassigned to Si—F bonds in the crystal, is 0.09 to 0.22. This phosphor is produced by bringing a silicon source in contact with an aqueous reaction solution containing potassium permanganate and hydrogen fluoride, wherein a molar ratio of hydrogen fluoride to potassium permanganate is 87 to 127.