Luminescent materials doped with metal nano particles and preparation methods therefor

A method for preparing luminescent material doped with metal nano particles, comprising:

• S1, at room temperature, dissolving PVP in deionized water to prepare aqueous solution of PVP;
• then adding M collosol into the aqueous solution of PVP, stirring magnetically for 2 h to 24 h to obtain surface-treated M collosol solution;
• S2, adding absolute ethanol and ammonia water successively into the surface-treated M collosol solution;
• then adding ethyl orthosilicate while stirring, performing reaction for 3 h to 10 h then separating and drying to obtain SiO2@My nanospheres;
• wherein volume ratio of absolute ethanol, deionized water, ammonia water and ethyl orthosilicate is in a range of 10:18 to 30:3 to 8:1 to 1.5;
• S3, according to the stoichiometric ratio of corresponding elements in the chemical formula of A5-x(PO4)2SiO4:xRE@My, weighing compound containing A, soluble phosphate, compound containing RE, and SiO2@My nanospheres obtained in S2, then grinding and mixing to obtain mixed powders;
• S4, in air or in reducing atmosphere, calcining the mixed powders obtained from S3 at a constant temperature ranged from 800° C. to 1600° C. for 0.5 h to 15 h;
• then cooling to room temperature, taking out the calcined matter and grinding to obtain luminescent material doped with metal nano particles represented by the chemical formula of A5-x(PO4)2SiO4:xRE@My;
• wherein @ denotes coating, M is inner core, M is at least one of metal nanoparticles selected from Ag, Au, Pt, Pd and Cu;
• RE is one or two ions selected from Eu, Gd, Tb, Tm, Sm, Ce, Dy and Mn;
• A is one or two elements selected from Ca, Sr, Ba, Mg, Li, Na and K;
• x is stoichiometric number in a range of 0<x≦1;
• y is molar ratio of M to Si, 0<y≦0.01.