Patent ID: 7476336

Claim:
A phosphor, which is given by a general composition formula expressed by MAaBbOoNn:Z, where element M is at least one alkaline earth metal, element A is Al, or Al and at least one Ga and In, element B is Si or, Si and Ge, element Z is a rare earth or transitional metal, O is oxygen, N is nitrogen, and 0<a<2, 2<b<4, 0<o<1, n=2/3(1−o)+a+4/3b2/3o, wherein the phosphor is irradiated at 25° C. with a predetermined monochromatic light in a wavelength range from 300 nm to 550 nm as an excitation light, the value of the relative intensity of a maximum peak in an emission spectrum is defined as P 25 , and when the phosphor is irradiated at 100° C. with the predetermined monochromatic light as the excitation light, the value of the relative intensity of the maximum peak is defined as P 100 , the relation of P 25 and P 100 is given satisfying (P 25 −P 100 )/P 25 ×100≦10.0.