Preparation method of divalent europium activated alkaline earth metal phosphate fluorescent powder

The invention relates to a preparation method of divalent europium activated alkaline earth metal phosphate fluorescent powder. The preparation method is characterized by comprising the steps of weighting BaCO3, CaCO3, La2O3, NH4H2PO4 and Eu2O3 according to the molar ratio of Ba2CaLa1-x(PO4)3:xEu , wherein H3BO3 is used as a reaction cosolvent; uniformly grinding all the raw materials, then, placing the raw materials into an alumina crucible, placing the alumina crucible into a muffle furnace, heating to 200 DEG C in the air atmosphere, sintering at constant temperature for 2h, cooling, and then, taking out a sample to be uniformly ground again; heating again to sinter the ground sample, wherein carbon powder is used a reducing agent; heating from the room temperature to 300 DEG C, then, heating at the speed of 10 DEG C/min until the temperature is raised to 1250 DEG C, and then, preserving the heat for 4h; cooling along with the furnace to obtain a fluorescent matrix, thereby preparing the fluorescent powder of the Ba2CaLa1-x(PO4)3:xEu , wherein the fluorescent powder can be used as a fluorescent material.