Patent ID: 7129526

Claim:
A white color light emitting device comprising: a light emitting diode (LED) emitting blue light between 410 nm and 470 nm; and a fluorescent material of ZnS x Se 1-x doped with more than 1×10 17 cm −3 Al, In, Ga, Cl, Br or I for converting the blue light into yellow light between 568 nm and 580 nm and synthesizing white color light by mixing the 410 nm–470 nm blue light with the 568 nm–580 nm yellow light; wherein the ZnS x Se 1-x of the fluorescent material is heat-treated in a Zn atmosphere and the ZnS ratio x of the ZnS x Se 1-x satisfies an inequality 0.3≦x≦0.67.