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:
Mar. 07, 2017
Filed:
Jun. 19, 2014
El-seed Corporation, Nagoya-shi, JP;
Johan Ekman, Nagoya, JP;
Atsushi Suzuki, Nagoya, JP;
Fumiharu Teramae, Nagoya, JP;
Tomohiko Maeda, Nagoya, JP;
Koichi Naniwae, Nagoya, JP;
EL-SEED CORPORATION, Nagoya-Shi, Aichi, JP;
Abstract
In order to provide a light-emitting device having improved color rendering properties, a light-emitting device which uses a SiC fluorescent material comprises a first SiC fluorescent portion in which a donor impurity and an acceptor impurity are added and which is formed of a SiC crystal; a second SiC fluorescent portion which is formed of a SiC crystal in which the same donor impurity as the first SiC fluorescent portion and the same acceptor impurity as the first SiC fluorescent portion are added, and in which a concentration of the acceptor impurity is higher than the concentration of the acceptor impurity in the first SiC fluorescent portion and an emission wavelength is longer than that of the first SiC fluorescent portion; and a light-emitting portion that emits excitation light that excites the first SiC fluorescent portion and the second SiC fluorescent portion. The color rendering property of the SiC fluorescent material is improved and it becomes easy to adjust the color temperature and the color rendering index of the light-emitting device which uses the SiC fluorescent material.