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:
Feb. 13, 2007
Filed:
Dec. 17, 2004
Ryo Yoshimatsu, Shinagawa-ku, JP;
Hisashi Yoshida, Shinagawa-ku, JP;
Ryo Yoshimatsu, Shinagawa-ku, JP;
Hisashi Yoshida, Shinagawa-ku, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention achieves improvement of the color reproducibility, color rendering properties and light emitting efficiency of a white light emitting diode. The present invention is a red fluorescent material composed of a europium doped lithium lanthanum niobate represented by a general formula of LiLaEuNbO(0<x≦1). The red fluorescent material can efficiently converts light in the light emission wavelength range from 350 to 410 nm of an ultraviolet light emitting diode into red light, and can efficiently converts blue light at 465 nm and green light at 538 nm into red light.