Terbium doped phosphate-based green luminescent material and preparation method thereof

The preparation method of terbium doped phosphate-based green luminescent material comprising:

• step one, providing the compound used as the source of alkaline earth metal, the compound used as the source of phosphate, the compound used as the source of rare-earth, and the compound used as the source of Tb3+ according to the molar ratio of the elements in M3RE1-xTbx(PO4)3, wherein, the compound used as the source of phosphate is added at excess molar ratio in a range of 10%-30%, M is alkaline earth metal, RE is rare-earth element, and x is in a range of 0.001 to 1;
• step two, mixing and grinding the compounds to get a mixture;
• step three, sintering the mixture as pre-treatment, and then cooling the mixture to get a sintered matter;
• and
• step four, grinding the sintered matter, calcining the ground matter in a reducing atmosphere, and then cooling them to get the terbium doped phosphate-based green luminescent material;
• wherein the calcining step of step four is a two step process wherein, the ground matter is firstly calcined at the temperature in a range of 800° C. to 1500° C. for 4 hours to 24 hours, and then cooled and ground, after that, a second calcining process is carried out at the temperature in a range of 700° C. to 950° C. for 5 hours to 10 hours, at least one of the first calcining process and the second calcining process is carried out in a reducing atmosphere.