Metal nanoparticle-coating silicate luminescent material and preparation method therefor

A method of preparing a metal nanoparticle-coating silicate luminescent material, wherein comprising the steps of:

• preparing a colloid containing a metal nanoparticle, said metal is at least one among Ag, Au, Pt, Pd, and Cu;
• surface processing said colloid containing a metal nanoparticle, then adding anhydrous ethanol, deionized water and ammonia, when mixed evenly and while stirring, adding tetraethylorthosilicate on the basis of the molar ratio, y, of the metal nanoparticle and Si, when reacted acquiring by separation of the metal nanoparticle-coating SiO2, where 0<y≦1×10−2;
• weighing, on the basis of the stoichiometric ratio, of the compounds corresponding to Li, Ca and Tb, and of the metal nanoparticle-coating SiO2, thermal processing when mixed evenly, and subjecting the same to thermal reduction in a reducing atmosphere, acquiring Li2Ca1-xSiO4:Tbx@My when cooled;
• where @ represents a coating, M is at least one among Ag, Au, Pt, Pd, and Cu nanoparticles, 0<x≦0.2.