Patent ID: 7524437

Claim:
A phosphor, which is given as a general composition formula expressed by MmAaBbOoNn:Z, (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is Ce acting as an activator.), satisfying 4.0<(a+b)/m<7.0,0.8≦a/m≦1.2, b/a>2.5, n>o, 4.0≦b/m≦6.0, 0<o/m≦3.0,n=2/3m+a+4/3b−2/3o, wherein when the phosphor is irradiated with one or more kind of monochromatic light or continuous light having a wavelength range from 350 nm to 500 nm as an excitation light, a peak wavelength in an emission spectrum is in the range from 500 to 600 nm.