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:
Oct. 16, 2012
Filed:
Nov. 30, 2010
Tsutomu Ishii, Yokohama, JP;
Yasumasa Ooya, Chigasaki, JP;
Ryo Sakai, Yokohama, JP;
Katsutoshi Nakagawa, Yokohama, JP;
Hajime Takeuchi, Yokohama, JP;
Yumi Ito, Yokohama, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Tsutomu Ishii, Yokohama, JP;
Yasumasa Ooya, Chigasaki, JP;
Ryo Sakai, Yokohama, JP;
Katsutoshi Nakagawa, Yokohama, JP;
Hajime Takeuchi, Yokohama, JP;
Yumi Ito, Yokohama, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-shi, JP;
Abstract
A white LED includes a light emitting element with a light emission peak wavelength equal to or longer than 380 nm and equal to or shorter than 420 nm, and a phosphor layer containing three or more types of phosphors including at least a blue phosphor, a green phosphor, and a red phosphor and disposed in a manner to cover at least part of the light emitting element. The phosphor layer has a first phosphor layer and a second phosphor layer disposed in an opposite side of a side of the light emitting element of the first phosphor layer. In the first phosphor layer, a content of the blue phosphor in an entire phosphor contained in the first phosphor layer is equal to or less than 5 mass %, or the blue phosphor is not contained. In the second phosphor layer, a content of phosphor other than the blue phosphor in an entire phosphor contained in the second phosphor layer is equal to or less than 5 mass %, or no phosphor other than the blue phosphor is contained.