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:
Aug. 13, 2013
Filed:
Jul. 12, 2005
Ken Sakuma, Sakura, JP;
Koji Omichi, Sakura, JP;
Naoki Kimura, Sakura, JP;
Masakazu Ohashi, Sakura, JP;
Daiichiro Tanaka, Sakura, JP;
Naoto Hirosaki, Tsukuba, JP;
Ken Sakuma, Sakura, JP;
Koji Omichi, Sakura, JP;
Naoki Kimura, Sakura, JP;
Masakazu Ohashi, Sakura, JP;
Daiichiro Tanaka, Sakura, JP;
Naoto Hirosaki, Tsukuba, JP;
Fujikura Ltd., Tokyo, JP;
National Institute for Materials Science, Ibaraki, JP;
Abstract
An incandescent lamp color light emitting diode lamp comprises a semiconductor blue light emitting diode chip having a center emission wavelength in a range of from 400 nm to 480 nm and a phosphor that absorbs light emitted from the diode chip to emit light having a different wavelength than the light emitted from the diode chip. The phosphor is represented by a general formula of M(Si, Al)(O, N):Eu. The main phase is an α-SiAlON phosphor having an α SiAlON structure, wherein M is at least one element of Ca, Y, Mg, Li, Sc, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sr and p is from 0.75 to 1.0; and q is between 0.02 and 0.09. The diode lamp emits light having an emission color produced by a mixture of the light emitted from the semiconductor blue light emitting and the light emitted from the α-SiAlON. The chromaticity range thereof falls within the range defined by chromaticity coordinates (x, y) of (0.4775, 0.4283), (0.4594, 0.3971), (0.4348, 0.4185), and (0.4214, 0.3887) on the XYZ chromaticity diagram.