Patent ID: 7887718

Claim:
A phosphor, which is given as a general composition formula expressed by MmAaBbOoNn:Z, (where element M is Sr, element A is Al, element B is Si, O is oxygen, N is nitrogen, and element Z is at least one of Ce or Eu), satisfying 4.0<(a+b)/m<7.0, b/a>2.5, n>o, n=2/3m+a+4/3b−2/3o, 1.1<a/m≦1.5, 3.5≦b/m≦4.5, and 0.48≦o/m≦0.81 wherein when excited by light in a wavelength range from 300 nm to 500 nm, the phosphor has an emission spectrum with a peak wavelength in a range from 500 nm to 650 nm.