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:
Apr. 24, 2018
Filed:
Sep. 10, 2015
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-shi, JP;
Ryosuke Hiramatsu, Yokohama, JP;
Keiko Albessard, Yokohama, JP;
Naotoshi Matsuda, Chigasaki, JP;
Masahiro Kato, Naka, JP;
KABUSHIKI KAISHA TOSHIBA, Minato-ku, JP;
TOSHIBA MATERIALS CO., LTD, Yokohama-shi, JP;
Abstract
The present invention provides a red-light emitting phosphor having high luminous efficacy and also a manufacturing method thereof. The phosphor is a red-light emitting phosphor mainly comprising potassium fluorosilicate and having a basic surface composition represented by the formula (A): KSiF. The disclosed phosphor is characterized by being activated by manganese and also characterized in that the amount of manganese on the surface is not more than 0.2 mol % based on the total amount of all the elements on the surface. This phosphor can be manufactured by washing with a weak acid a product obtained by placing a silicon source to react in contact with a reaction solution containing potassium permanganate.