纳米长余辉发光材料CaTiO_3∶Pr的制备及表征

Preparation and Characterization of Long-Afterglow Nanophosphors CaTiO_3∶Pr

以无机盐为原料,以明胶为分散介质,采用凝胶网格沉淀法制备了掺镨的钛酸钙纳米颗粒。通过热重和差热分析,讨论了CaTiO3∶Pr共沉淀及锻烧过程中的反应机理。用透射电子显微镜观测到纳米颗粒呈类球形,粒径为100 nm左右,分散性良好。利用荧光光谱分析仪对纳米CaTiO3∶Pr粉体的发光性能进行了表征。光谱数据表明:1 100℃时,煅烧1 h发光强度最大,其发光特性与传统的高温固相法相似,但烧结温度可以降低200℃。系统地研究了制备纳米CaTiO3∶Pr长余辉发光粉体的工艺条件及其影响因素,给出了最佳的制备条件。文章报道的制备方法所需装置简单,实验成本低。

CaTiO3 ： Pr nanophosphors were prepared with a gel-network precipitation technique using cheap inorganic precursors. The samples, being well dispersed and sphere-like with an average diameter of 100 nm, were observed with transmission electron microscope （TEM）. The mechanism of coprecipitation and crystallization was discussed briefly based on TG-DTA and the X-ray diffractometer （XRD） results. The luminescent properties were investigated by the fluorescence spectrophotometer. The conditions of the preparation process were also studied systematically and the optimal conditions were concluded. The resuits show that the products with strongest luminescence intensity could be prepared at 1 100 ℃ for one hour, and the luminescent features of samples synthesized by the gel-network precipitation technique are similar to those by solid-state reaction, while the calcining temperature is reduced about 200 ℃. In conclusion, uniform long-afterglow nanophosphors CaTiO3 ： Pr were successfully synthesized with simple apparatus at low cost.