Method for preparing europium-doped yttrium phosphate-vanadate Y (V0.5, P0.5) O4:0.05Eu ultrafine fluorescent powder

The invention provides a method for preparing europium-doped yttrium phosphate-vanadate Y (V0.5, P0.5) O4:0.05Eu ultrafine fluorescent powder. The method comprises the steps of: firstly, preparing a mixed nitrate solution A containing Y and Eu; adding dimethylbenzene solution of hexadecyl trimethyl ammonium bromide and hexyl alcohol into the mixed solution A; ultrasonically dispersing the resulting solution to form micro-emulsion I; weighing and dissolving P2O5 and V2O5 according to the stoichiometric ratio of Y (V0.5, P0.5) O4:0.05Eu and adjusting the pH value to 8-9 to obtain a solution B; dropping the solution B to the micro-emulsion when stirring; further stirring the solution after the solution becomes turbid until sediment occurs; carrying out centrifugal separation on the sediment; washing the sediment to remove an oil phase and a surfactant; drying the resulting sediment to obtain a precursor; and finally, sintering the precursor in a muffle furnace to obtain the fluorescent powder.