Zinc aluminate luminescent material and preparation method thereof

A method of preparing a zinc aluminate luminescent material, comprising the following steps;

• preparing a sol containing M, wherein M is at least one metal nanoparticles selected from the group consisting of Ag, Au, Pt, Pd and Cu;
• surface-treating the sol containing M, adding a solution containing Al3+, stirring, adding a precipitating agent, reacting at a temperature ranging from 0° C. to 100° C. to form a precipitate, filtering, washing, drying, and calcining the precipitate to obtain Al2O3 powder coating M;
• mixing compounds containing Zn and A, and the Al2O3 powder costing M according to a stoichiometry ratio in a molecular formula of Zn1-xAl2O4:A3+x@Al2O3@My to obtain a mixture, wherein A is selected from the group consisting of Cr, Eu, Tb, and Ce;
• 0<x≦0.1;
• y is a ratio between the molar amount of M and a sum of the molar amount of Al in Zn1-xAl2O4:A3+x and Al in Al2O3@My, 0<y≦1×10−2;
• and
• grinding and mixing the mixture, calcining the mixture, cooling and grinding to obtain the zinc aluminate luminescent material having a general molecular formula of Zn1-xAl2O4:A3+x@Al2O3@My, wherein @ represents coating;
• the zinc aluminate luminescent material uses M as a core, Al2O3 as an inner shell, and Zn1-xAl2O4:A3+x as an outer shell.