水热法合成CaWO4荧光体的研究

钨酸钙是X射线和紫外线常用的发光材料,通常都用高温固相反应法合成,我们曾研究过用微波热法合成[1].水热法是合成无机微孔材料、快离子导体等物质的重要方法,但用来合成荧光体仍少有报道.

Synthesis of CaWO4 Phosphors with the Hydrothermal Method

It is the first report of using the hydrothermal method to synthesize powder crystal CaWO₄ phosphors whose structure is a kind of tetragonal structure with lattice parameters a=0.5248 nm, c=1.1355 nm. The phosphors have excitation spectra peak at λ_ex=233 nm, and emission spectra peak at λ_em=426 nm. Under 254 nm excitation, the phosphors were measured by FMS-1 chromatic detector, and its chromatic coordinates are x=0.1725, y=0.1424 respectively. The particle size distribution was measured by JWY laser particle size analyzer and its medium diameter is 3.90 μm, D₇₅ / D₂₅=3.93/2.27=1.73, its volume specific surface area is S_V=24368 cm^-1 .