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:
Jun. 25, 2013
Filed:
Aug. 26, 2011
Applicants:
Masahiro Kato, Kanagawa-Ken, JP;
Yumi Fukuda, Tokyo, JP;
Aoi Okada, Tokyo, JP;
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/63 (2006.01); C04B 35/64 (2006.01);
U.S. Cl.
CPC ...
Abstract
The fluorescent substance according to the embodiment is generally represented by (MEC)SiAlON, and is a kind of the SrSiAlONphosphors. The substance is in the form of crystals having a mean grain size of 20 to 100 μm, and the aspect ratio thereof is in the range of 2 to 4. This substance emits luminescence having a peak in the wavelength range of 580 to 660 nm when excited by light of 250 to 500 nm. The embodiment also provides a light-emitting device comprising this substance in combination with a light-emitting element and a green light-emitting fluorescent substance.