White light emitting lighting system
A white light emitting lighting system, comprising a blue or UV light emitting diode and a coating comprising a yellow luminescent phosphor having a peak emission wavelength greater than 550 nm, wherein the phosphor comprises a S r2-X-Y-Z Ca y Ba z SiO 4 :Eu x phosphor, and wherein 0<=0.06 and 0<(3y+z)<=0.5. If the diode is a UV light emitting diode the coating further comprises a blue luminescent phosphor.
1 . A white light emitting lighting system, comprising a blue or UV light emitting diode and a coating comprising a yellow luminescent phosphor having a peak emission wavelength greater than 550 nm, wherein the phosphor comprises a Sr 2-x-y-z Ca y Ba z SiO 4 :Eu x phosphor, and wherein 0<x<=0.06 and 0<(3y+z)<=0.5.
2 . The system according to claim 1 , wherein 0<x<=0.04, preferably 0.01<=x<=0.03.
3 . The system according to claim 1 , wherein 0<y<=0.1, preferably 0.01<=y<=0.06.
4 . The system according to claim 1 , wherein 0<=z<=0.3, preferably 0.03<=z<=0.25.
5 . The system according to claim 1 , wherein the phosphor further comprises a cerium doped yttrium aluminium garnet (YAG:Ce) phosphor.
6 . The system according to claim 1 , wherein the diode is a UV light emitting diode, and the coating further comprises a blue luminescent phosphor.
7 . The system according to claim 6 , wherein the blue luminescent phosphor comprises a BaMgAl 10 O 17 :Eu phosphor.