Title:
TRI-COLOR WHITE LIGHT LED LAMP
Document Type and Number:
WIPO Patent Application WO2003080763
Kind Code:
A8
Abstract:
The invention relates to a tri-color lamp for generating white 1ight comprising a phosphor composition comprising a phosphor of general formula (Ba1-x-y-z-SrxCay)2SiO4:Euz, wherein 0 <= x <=1, 0 <= y <=1 and 0 < z < 1. The phosphor composition may also comprise a red phosphor. The two phosphors can absorb radiation emitted by a 1ight emitting diode, particularly a blue LED. This arrangement provides a mixing of three light sources -light emitted from the two phosphors and unabsorbed light from the LED. The invention also relates to an alternative to a green LED comprising a single green phosphor of general formula (Ba1-x-y-z-SrxCay)2SiO4:Euz, wherein 0 <= x <=1, 0 <= y <=1 and 0 < z < 1, that absorbs radiation from a blue LED. A resulting device provides green light of high absorption efficiency and high luminous equivalent va1ues.
Inventors:
JUESTEL THOMAS (DE)
MAYR WALTER (DE)
SCHMIDT PETER J (DE)
MUELLER GERD O (DE)
MUELLER-MACH REGINA B (DE)
MAYR WALTER (DE)
SCHMIDT PETER J (DE)
MUELLER GERD O (DE)
MUELLER-MACH REGINA B (DE)
Application Number:
PCT/IB2003/001042
Publication Date:
November 27, 2003
Filing Date:
March 21, 2003
Export Citation:
Assignee:
PHILIPS INTELLECTUAL PROPERTY (DE)
KONINKL PHILIPS ELECTRONICS NV (NL)
JUESTEL THOMAS (DE)
MAYR WALTER (DE)
SCHMIDT PETER J (DE)
MUELLER GERD O (DE)
MUELLER-MACH REGINA B (DE)
LUMILEDS LIGHTING (US)
KONINKL PHILIPS ELECTRONICS NV (NL)
JUESTEL THOMAS (DE)
MAYR WALTER (DE)
SCHMIDT PETER J (DE)
MUELLER GERD O (DE)
MUELLER-MACH REGINA B (DE)
LUMILEDS LIGHTING (US)
International Classes:
C09K11/59; C09K11/00; C09K11/08; C09K11/56; C09K11/77; C09K11/80; H01L33/50; (IPC1-7): C09K11/08
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