Fluorescent composite particle and preparation method thereof

A preparation method of a fluorescent composite particle, comprising following steps:

• preparing a fluorescent material precursor, and adding a surfactant to the fluorescent material precursor to obtain a first mixture;
• adding an oxide material precursor to the first mixture and allowing the oxide material precursor to undergo in-situ hydrolysis to obtain a second mixture, wherein a molar ratio of the fluorescent material precursor to the oxide material precursor is ranged from 10:1 to 1:50;
• and
• separating a solid mixture in the second mixture, calcining the solid mixture for a predetermined time under a predetermined temperature condition to obtain the fluorescent composite particle comprising an oxide material and a fluorescent material, wherein the fluorescent material is coated with the oxide material in the fluorescent composite particle, and the fluorescent composite particle has a particle size of 20 nm to 500 nm, a density of 1.8 g/cm3 to 7 g/cm3, and a specific surface area of 8 m2/g to 200 m2/g.