水热法合成CaWO_4荧光体的研究

Synthesis of CaWO 4 Phosphors with the Hydrothermal Method

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．１９９０年Ｋｕｔｙ等［２，３］首次报道用水热法合成硼铝酸盐荧光体．水...

It is the first report of using the hydrothermal method to synthesize powder crystal CaWO 4 phosphors whose structure is a kind of tetragonal structure with lattice parameters a = 0.524 8 nm, c = 1.135 5 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 =0.172 5, y =0.142 4 respectively. The particle size distribution was measured by JWY laser particle size analyzer and its medium diameter is 3.90 μm, D 75 / D 25 =3.93/2.27=1.73, its volume specific surface area is S V =24 368 cm -1 .