纳米Ca_(0.8)Zn_(0.2)TiO_3∶Pr^(3+),Na^+荧光粉的合成和红色发光性质

Preparation and Characterization of Red Luminescent Ca_(0.8)Zn_ (0.2)TiO_3∶ Pr^(3+), Na^+ Nanophosphor

采用溶胶-凝胶法在较低温度下合成了Ca0.8Zn0.2TiO3∶Pr3+,Na+纳米荧光粉。金属离子预先分散在溶有柠檬酸的乙二醇溶液中。通过TG-DSC,XRD和SEM对前驱物的分解、晶化和颗粒大小进行了研究。TG-DSC和XRD表明材料的组成随灼烧温度而变化;SEM表明1000℃合成材料的粒径在100nm以下。与高温固相法合成的材料相比,激发光谱主峰发生蓝移,红色发射峰617nm显著增强。

Nanophosphor with the nominal composition of Ca0.8Zn0.2TiO3∶ Pr^3＋, Na^＋ was synthesized at relatively low temperature by the sol-gel method, in which metals are precedently dispersed by citric acid in ethylene glycol solvent. The decomposition process of the precursor, and crystallization and particle size of Ca0.8Zn0.2TiO3∶ Pr^3＋, Na^＋ were examined by thermal analysis （TG-DSC）, powder X-ray diffraction （ XRD ）, and scanning election microscopy （SEM）. Results of TG-DSC and XRD reveal that the composition of Ca0.8Zn0.2TiO3∶ Pr^3＋, Na^＋ changes with the sintering temperature. SEM data indicate that the diameter of particles is under 100 nm even if the sintering temperature goes up to 1000℃. In contrast to a solid state reaction, the excitation spectra of samples synthesized using sol-gel method shift blue about 10 nm and the emission intensity of the peak at 617 nm increase significantly.