Patent ID: 8372309

Claim:
A phosphor of the composition formula MmAaBbOoNn:Z, wherein element M is Sr, element A is Al, element B is Si, O is oxygen, N is nitrogen, and element Z is Ce or Eu, satisfying 4.0<(a+b)/m<7.0, 0.5≦a/m≦2.0, 3.0<b/m<7.0, 0<o/m≦4.0, and n=2/3m+a+4/3b−2/3o, wherein the phosphor contains from 19.5 wt. % to 29.5 wt. % of Sr, from 5.0 wt. % to 16.8 wt. % of Al, from 0.5 wt. % to 8.1 wt. % of O, from 22.6 wt. % to 32.0 wt. % of N, and from more than 0.0 to 3.5 wt. % of element Z, wherein when excited by light in a wavelength range from 300 nm to 500 nm, a peak wavelength in an emission spectrum is in a range from 500 nm to 650 nm, a crystal system of a main production phase of said phosphor is a crystal phase of a rhombic or a monoclinic system, and a product phase contained in the phosphor has characteristic peaks in a Bragg angle (2θ) range of 12.5° to 13.5°, 17.0° to 18.0°, 21.0° to 22.0°, 22.5° to 23.5°, 26.5° to 27.5°, 28.5° to 29.5°, 34.0° to 35.0°, 35.5° to 36.5°, 36.5° to 37.5°,41.0° to 42.0°, 42.0° to 43.0°, 56.5° to 57.5°, and 66.0° to 67.0°.