CaTiO_3:Pr发光材料的低温固相法合成及其发光性能

Improvement of the Optical Properties of CaTiO_3:Pr Synthesized by Solid-State Reaction at Low Temperature

以钛酸四丁酯和硝酸钙为原料,用改进的固相反应法成功合成了CaTiO3:Pr红色荧光粉.为了提高这种荧光粉的发光性能,加入铝离子作为电荷补偿剂,硼酸作为助熔剂,以及加入锌离子和镁离子替代一部分钙离子,并对其发光性能的影响进行了研究.采用X射线衍射、荧光分光光度计和扫描电镜研究了CaTiO3:Pr的物相组成,发光性质和颗粒形貌.结果表明一定量的硼酸、铝离子、镁离子、锌离子能够有效的提高CaTiO3:Pr红色荧光粉发光强度.余辉曲线和发光亮度表明当硼酸与硝酸钙的物质的量之比为0.3,铝离子与硝酸钙的物质的量之比为0.001时Ca0.8Zn0.2TiO3:Pr,Ca0.9Mg0.1TiO3:Pr样品具有最佳的发光性能.

Using tetra - n - butyl titanate and nitrates as starting materials, red persistent phosphors CaTiO3 ： Pr have been successfully synthesized by modified solid - state reaction. In order to improve the luminescent properties of the phosphors, boric acid as flux material and aluminum ion as charge compensator were added in, and the influences of partially replacing Ca^2＋ in CaTiO3 with Mg^2 ＋ or Zn^2 ＋ on the long persistent properties were studied. Lumineseence spectrometer, X -ray diffraction and transmission electron microscopy showed that a certain quantity of boric acid, Al^3＋ , Mg^2＋ or Zn^2＋ was effective in impruving the photoluminescence intensity of CaTiO3 ： Pr phosphors, and the optimum molar ratios of boric acid and Al^3 ＋ to Ca^2 ＋ were about 0.3% and 0. 1% respectively. The photoluminescence brightness and decay curves showed that the samples Ca0.8Zn0.2TiO3：Pr with 0.1% Al3. and 30% boric acid obtained at the sintering temperature of 900℃ exhibited the optimal luminescent properties.