Patent ID: 7858997

Claim:
A light emitting apparatus, comprising: a light emitting element with an emission wavelength in a range of 360 to 550; and a rare-earth element doped oxide nitride phosphor; wherein a part of light radiated from the light emitting element is wavelength-converted by the phosphor, wherein the phosphor comprises an α-sialon, a β-sialon, and unreacted silicon nitride, and wherein said phosphor comprises the α-sialon of 40 weight % or more and 90 weight % or less, the β-sialon of 5 weight % or more and 40 weight % or less, and the unreacted silicon nitride of 5 weight % or more and 30 weight % or less, and the α-sialon comprises a Ca-α-sialon represented by: (Ca x , M y )(Si,Al) 12 (O,N) 16 , where Ca sites of 15 to 20% are replaced by Eu, 0.05 <(x +y)<0.3, 0.02 <x <0.27, and 0.03 <y <0.3.