Patent ID: 8017961

Claim:
A light emitting device, comprising: a light emitting diode to emit blue light; at least one orthosilicate based phosphor to emit light in a green to yellow region; and an alkaline earth metal sulfide based phosphor to emit light in a red region, wherein the at least one orthosilicate based phosphor and the alkaline earth metal sulfide based phosphor are disposed on the light emitting diode, wherein the orthosilicate based phosphor comprises a(M I O).b(M II O).c(M III A).d(M III 2 O).e(M IV 2 O 3 ).f(M V o O p ).g(SiO 2 ).h(M VI x O y ), wherein M I is at least one element selected from the group consisting of Pb and Cu; M II is at least one element selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd and Mn; M III is at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Au and Ag; M IV is at least one element selected from the group consisting of B, Al, Ga and In; M V is at least one element selected from the group consisting of Ge, V, Nd, Ta, W, Mo, Ti, Zr and Hf; M VI is at least one element selected from the group consisting of Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; A is at least one element selected from the group consisting of F, Cl, Br and I; a, b, c, d, e, f, g, h, o, p, x and y are set in ranges of 0<a≦2, 0≦b≦8, 0≦c≦4, 0≦d≦2, 0≦e≦2, 0≦f≦2, 0≦g≦10, 0≦h≦5, 1≦o≦2, 1≦p≦5, 1≦x≦2, and 1≦y≦5.