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. 15, 2013
Filed:
Aug. 22, 2011
Iwao Mitsuishi, Tokyo, JP;
Yumi Fukuda, Tokyo, JP;
Aoi Okada, Tokyo, JP;
Ryosuke Hiramatsu, Kanagawa, JP;
Naotoshi Matsuda, Kanagawa, JP;
Shinya Nunoue, Chiba, JP;
Keiko Albessard, Kanagawa, JP;
Masahiro Kato, Kanagawa, JP;
Iwao Mitsuishi, Tokyo, JP;
Yumi Fukuda, Tokyo, JP;
Aoi Okada, Tokyo, JP;
Ryosuke Hiramatsu, Kanagawa, JP;
Naotoshi Matsuda, Kanagawa, JP;
Shinya Nunoue, Chiba, JP;
Keiko Albessard, Kanagawa, JP;
Masahiro Kato, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.