TRI-COLOR WHITE LIGHT LED LAMP

摘要

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.