Patent ID: 8030839

Claim:
A phosphor activated with europium and capable of absorbing near-ultraviolet light to blue light and emitting green light, wherein a substantial composition of the phosphor is represented by a general formula shown below in which x, y, z, a, and b are in the ranges as shown below: M x Eu y MgSi z O a X b wherein M is at least one selected from the group consisting of Ca, Sr, Ba, Zn, and Mn; X is at least one selected from the group consisting of F, Cl, Br, and I; 6.5≦x≦8.0; 0.01≦y≦2.0; 3.7≦z≦4.3; a=x+y+1+2z−b/2; and 1.0≦b≦1.9.