Rare earth halosilicate red long-afterglow phosphor, and preparation method thereof

The invention relates to a type of rare earth halosilicate red long-afterglow phosphor, and a preparation method thereof. Especially, the invention relates to a type of red long-afterglow phosphor prepared from a base material of rare-earth-modified solonetz halosilicate, and a preparation method thereof. The phosphor is characterized in the structural formula of: (1-[alpha])M,2[alpha]/3Ln)5(SiO4)2X2:[beta]Eu,[gamma]Ln, wherein M is at least one of Mg and Ca, Ln is at least one of Y, La, and Gd, X is at least one of F and Cl, Ln is at least one of Dy, Er, and Bi, [alpha]=0.1 to 1, [beta]=0.03 to0.07, and [gamma]=0.001 to 0.05. According to the method, solonetz halosilicate is appropriately modified with rare earth, such that rare-earth-modified solonetz halosilicate, which has a structural formula of (M,Ln)5(SiO4)2X2 is obtained. The rare-earth-modified solonetz halosilicate is adopted as a novel base material, and a rare earth ion Eu is adopted as a luminous ion. According to the lu