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. 11, 2009
Filed:
Feb. 15, 2005
Naoto Hirosaki, Tsukuba, JP;
Ken Sakuma, Tsukuba, JP;
Kyota Ueda, Tsukuba, JP;
Hajime Yamamoto, Tsukuba, JP;
Naoto Hirosaki, Tsukuba, JP;
Ken Sakuma, Tsukuba, JP;
Kyota Ueda, Tsukuba, JP;
Hajime Yamamoto, Tsukuba, JP;
National Institute for Materials Science, Tsukuba-Shi, Ibaraki, JP;
Abstract
The present invention provides a white light emitting diode for emitting white light with warmness at a higher luminance, and an intermediate color light emitting diode satisfying light emission with diversified color tones at a higher luminance. A fluorescent material which emits yellowish red or red light and has a CaAlSiNcrystal phase including, dissolved therein in a solid state, one or more element(s) selected from Mn, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. The fluorescent material is mixed with another fluorescent material emitting green, yellowish green, or yellow light, and the mixed phosphor is combined with a semiconductor light emitting element for emitting bluish purple or blue light, to fabricate a white light emitting diode which efficiently emits a warm white light with a high efficiency.