Submicron Tm3+:beta-Li2TiO3 high purity blue light phosphor and preparation method

The invention provides a preparation method of submicron Tm3+:beta-Li2TiO3 high purity blue light phosphor, and the method comprises the following steps: dissolving Li2O particles in distilled water; preparing a LiOH solution whose mole concentration is 0.10-3.00 mol/L; adding Ti source and Tm source into the solution; performing mixing uniformly; carrying out a hydrothermal reaction for 1-20 hours at 100-240 DEG C in a baking oven; performing cooling in a furnace, fetching out hydrothermal products; drying the hydrothermal products; performing grinding uniformly; performing calcining for 6-36 hours at 500-700 DEG C. in an electric resistance furnace; cooling in furnace and grinding; and obtaining the high purity blue light phosphor.