Patent ID: 8906262

Claim:
A lighting device comprising: a) a light source that emits light at wavelengths of at least about 300 nm; and b) at least one phosphor having a formula selected from the group consisting of: 1) (M1 x M2 1-x ) 2 LiSiO 4 X:A; 2) (M1 x M2 1-x ) 10 (SiO 4 ) 3 (SO 4 ) 3 X 2 :A; and 3) (M1 x M2 1-x ) 4 (SiO 4 )(SO 4 )X 2 :A; wherein: M1 and M2 are each independently at least one metal ion selected from the group consisting of Mg 2+ , Ca 2+ , Sr + , Ba 2+ , Zn 2+ and Cd 2+ ; X is a value from about 0.001 to about 1; X is at least one halide ion in ionic form; A is at least one activator ion selected from the group consisting of Eu 2+ , Yb 2+ , Mn 2+ , Bi 3+ , Pb 2+ , Ce 3+ , Nd 3+ , Pr 2+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ ; if the phosphor has the formula (M1 x M2 1-x ) 2 LiSiO 4 X:A, and M1 is Sr 2+ , x is 1 and X is fluoride or M2 is Sr 2+ , x is 0 and X is fluoride, then A is not Eu 2+ ; and the phosphor is capable of absorbing at least a portion of the light emitted from the light source; the phosphor modifies a chromaticity of the portion of the light absorbed from the light source; and the phosphor emits light of a longer wavelength than that of the light absorbed from the light source.