Praseodymium-doped calcium titanate luminescent powder and preparation method thereof

The invention provides praseodymium-doped calcium titanate luminescent powder and a preparation method thereof. The preparation method comprises the following steps: at room temperature, weighing a certain amount of CaCO3 and Pr6O11 solid according to a molar ratio of Pr3+/Ca2+ of 0.005/1, dissolving the solid in dilute nitric acid, heating and stirring the solution to remove excessive acid, and heating the solution to a melting state after the pH value of the solution reaches 2 to 3; after the solution is cooled to room temperature, adding 20 milliliters of tetrabutyl titanate and 20 milliliters of water-ethanol solution into the solution according to a stoichiometric proportion, then adding a certain amount of citric acid as complexing agent into the solution, adding polyethylene glycol into the solution, and stirring the solution for 2 hours to obtain an even transparent sol precursor; spraying and drying the obtained precursor solution to obtain precursor powder; and putting the precursor powder into a programmed temperature rising furnace, heating the precursor powder to between 600 and 1,000 DEG C, and then keeping the precursor powder for 3 hours at a constant temperature to obtain CaTiO3: Pr3+ luminescent powder. The praseodymium-doped calcium titanate luminescent powder prepared by the method has good crystallization degree and high purity, and is a CaTiO3 pure phase of a perovskite structure.