Patent ID: 8398892

Claim:
A phosphor which comprises a phosphor material having a composition represented by a general formula: M(0) a M(1) b M(2) x−(vm+n) M(3) (vm+n)−y O n N z−n , wherein M(0) is one or more elements selected from Li, Na, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Gd, and Lu; M(1) Eu; M(2) is one or more elements selected from Si, Ge, Sn, Ti, Hf and Zr; M(3) is one or more elements selected from Be, B, Al, Ga, In, Tl and Zn; O is oxygen; N is nitrogen; and an atomic ratio of M(0), M(1), M(2), M(3), O and N is adjusted to satisfy the following: x, y and z satisfy 33≦x≦51, 8≦y≦12 and 36≦z≦56; a and b satisfy 3≦a+b≦7 and 0.001≦b≦1.2; m and n satisfy 0.8 ·me≦m≦1.2 ·me and 0≦n≦7 in which me=a+b; and v satisfies v={a·v(0)+b·v(1)}/(a+b), wherein v(0) is a valence of M(0) ion and v(1) is a valence of M(1) ion, and wherein the phosphor emits 480 to 540-nm light.