Patent ID: 8154191

Claim:
A luminescent material, in particular a luminescent material used in light emitting devices including LED, characterized in that the luminescent material mainly comprises a silicate and an activating agent ion, and has a main chemical composition expressed by the following formula: aAO.bA′O.cSiO 2 :xEu.yLn.zM.δN wherein, A is selected from the group consisting of Sr, Ca, Ba, and combinations thereof; A′ is selected from the group consisting of Mg, Zn, and combinations thereof; Ln is ion(s) of at least one element selected from the group consisting of Nd, Dy, Ho, Tm, La, Ce, Er, Pr, Bi, Sm, Sn, Y, Lu, Ga, Sb, Tb, Mn and Pb; M is selected from the group consisting of Cl − , F − , Br − , I − , and combinations thereof; N is selected from the group consisting of Li + , Na + , K + , Ag + , and combinations thereof; a, b, c, x, y, z, and δ are molar coefficients,1.0≦a≦5.0; 0≦b≦2.0; 0.5≦c≦2.5; 0.001≦x≦0.2; 0≦y≦0.5; 0<z<0.5; 0<δ<0.2; and wherein 1≦(a+b)/c≦4; and in that under the excitation of a light emitting element as an excitation light source that has an emission spectrum in UV light to blue light region of from 240 to 475 nm, the luminescent material absorbs at least a portion of light from the excitation light source and thereby generates an emission spectrum having at least two peaks in a range of from 370 to 760 nm, with the emissions combining to give white light.