Tetravalent manganese doped fluoride red fluorescent material with homogeneous core-shell structure and preparation method of tetravalent manganese doped fluoride red fluorescent material

The invention discloses a tetravalent manganese doped fluoride red fluorescent material with a homogeneous core-shell structure and a preparation method of the tetravalent manganese doped fluoride red fluorescent material, the chemical formula of the fluorescent material is K2Ta (1-x) In < x > F < 7 >: ymol% Mn < 4 + > (at) K2Ta (1-x) In < x > F < 7 >, x is less than or equal to 5, 0lt; y is less than or equal to 8, and the luminescence center is transition metal Mn < 4 + > ions. A series of shell-free K2Ta (1-x) InxF7: ymol% Mn < 4 + > red fluorescent materials are synthesized by taking K2TaF7 with an asymmetric octahedral structure as a matrix and Mn < 4 + > as a luminescence center and introducing In < 3 + > to replace Ta < 5 + > in the matrix. The red fluorescent material with the homogeneous core-shell structure has high emission efficiency, high color purity and good water resistance, has excellent red luminescence performance under excitation of a commercial blue light LED chip, and is potential red fl