Silicate-based luminescent material with multiple emission peaks, method for preparing the luminescent material, and light emitting device using the luminescent material

摘要

A silicate luminescent material excitable by an excitation light source having emissions in UV to blue light region, a process for producing the same, and a white light emitting device. The luminescent material has an emission spectrum with at least two peaks in a range of from 370 to 760 nm, and has a general chemical composition formula of aAO·bA'O·cSiO 2 :xEu·yLn·zM·´N, 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 selected from the group consisting of Nd, Dy, Ho, Tm, La, Ce, Er, Pr, Bi, Sm, Sn, Y, Lu, Ga, Sb, Tb, Mn, Pb and combinations thereof; M is one or a combination of halogen ions; N is selected from the group consisting of Li + , Na + , K + , Ag + , and combinations thereof; and a, b, c, x, y, z, and ´ are molar coefficients.