制备条件对溶胶凝胶制备Tb3Al5O12∶Ce3+荧光粉性能的影响

摘要

采用溶胶凝胶法在不同柠檬酸量和干燥温度下制备了Ce3掺杂的TAG荧光粉,同时研究了Ce3+掺杂浓度对TAG粉体性能的影响.结果表明:柠檬酸的量和干燥温度对TAG荧光性能有重要影响.在180℃下干燥,有效去除了前驱体中的结合水,从而降低了TAG相的转变温度,TAG最大相转变温度出现在877.5℃;提高柠檬酸的量能有效减少颗粒的团聚,从而增强粉体的荧光性能;TAG∶Ce3+荧光粉的发光强度随着Ce3浓度的增加呈现先增加后降低的趋势,最优掺杂摩尔分数为1％,对应的最大发射波长为534 nm.%The Ce3+ doped terbium aluminum garnet (Tb3Al5O12∶ Ce,TAG∶Ce) phosphor was prepared by sol-gel method with different amount of citric acid in drying tempereture.The effects of Ce3 + doped concentration on the emission intensity,maximum emission band of the TAG∶Ce phosphor were also discussed in detail.The result showed that the amount of citric acid and drying temperature could affect the luminescent properties of the TAG∶Ce phosphor.The molecular water was removed by drying at 180 ℃,which brings a good sintering activity.Due to its good sintering activity,the temperature of maximum phase transition of TAG was observed at a lower temperature of 877.5 ℃.The emission intensity first increased and then decreased with the inereasing of the concentration of Ce3 +.The optimum doping concentration of Ce3 + for the TAG∶ Ce phosphor was about 1％ corresponding to the highest emission intensity at 534 nm.