Title:
RED PHOSPHOR MATERIAL, WHITE LIGHT-EMITTING DIODE USING THE SAME, AND ILLUMINATOR USING THE WHITE LIGHT-EMITTING DIODE
Document Type and Number:
Japanese Patent JP2005179498
Kind Code:
A
Abstract:
To provide a white light-emitting diode improved in color reproducibility, color rendering tendency and luminous efficiency.
A red phosphor material consisting of an europium-activated calcium-lanthanum tungstate of the general formula: Ca3(La1-xEux)W2O12(0<x≤1) is provided. The white light-emitting diode using the red phosphor material is also provided. This diode efficiently emits red color in the luminous wavelength region for ultraviolet light-emitting diode, i.e. 350-410 nm and also can efficiently convert to red color the rays of about 465 nm falling in the wavelength region for blue light-emitting diode and rays of about 538 nm falling in the wavelength region for green light-emitting diode, respectively.
Inventors:
YOSHIMATSU MAKOTO
YOSHIDA HISAFUMI
YOSHIDA HISAFUMI
Application Number:
JP2003422348A
Publication Date:
July 07, 2005
Filing Date:
December 19, 2003
Export Citation:
Assignee:
NEC LIGHTING LTD
International Classes:
C09K11/78; C09K11/08; C09K11/68; C09K11/77; C09K11/80; G02F1/13; H01L21/00; H01L27/15; H01L33/48; H01L33/50; (IPC1-7): C09K11/78; C09K11/08; C09K11/80; H01L33/00
Attorney, Agent or Firm:
Akio Miyazaki
Shinichi Iwata
Masaaki Ogata
Ishibashi Masayuki
Shinichi Iwata
Masaaki Ogata
Ishibashi Masayuki
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