Abstract: A surface diffusion method was proposed and applied to prepare blue phosphor BaMgAl₁₀O_l7 :Eu²⁺. The results show that, compared with the direct synthesis method by common high temperature solid state, the concentration of Eu²⁺ in the phosphor BaMgAl₁₀O₁₇:Eu²⁺ prepared by the surface diffusion method can be greatly reduced owing to the activator Eu²⁺ ions distributed mainly over the surface of the phosphor. It is possible to reduce the cost of this kind of the luminescent materials with the aid of the surface diffusion method.

Key words: surface diffusion method, preparation, blue-emitting phosphor