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

摘要

Nanophosphor with the nominal composition of Ca_(0.8)Zn_(0.2)TiO_3∶Pr~(3+), Na~+ (CZTOPN) was synthesized at relatively low temperature by the sol-gel method. Metal ions were dispersed by citric acid in ethylene glycol solvent and then react with Ti(OC_4H_9)_4 to form sol and gel. The decomposition process of the precursor, and crystallization and particle size of CZTOPN were examined by thermal analysis (TG-DSC), powder X-ray diffraction (XRD), and scan election microscopy (SEM) . Results of TG-DSC and XRD reveal that the composition of Ca_(0.8)Zn_(0.2)TiO_3∶Pr~(3+), Na~+ changes with the sintering temperature. SEM data indicate that the diameter of particles is under 50 nm even if the sintering temperature increases to 1000℃. In contrast to a solid state reaction, the excitation spectra of samples synthesized by the sol-gel method shift blue about 10 nm and the emission intensity at 617 nm increases significantly.