离子液体中镧的氟化物合成及其上转换发光性能研究

采用离子液体(1-丁基3-甲基咪唑四氟硼酸盐)作为反应体系和氟源合成稀土镧的氟化物,研究了原料配比对合成产物及形貌的影响,分析了反应的机理.通过XRD、SEM等测试方法对得到的NaLaF4∶Er/Yb,及LaF3∶Er进行了表征和分析.使用980 nm激光激发,测试了样品的上转换发光性能,分析了Er3+浓度及yb3+的双掺对上转换性能的影响.在303 ～583 K温度范围内,测试了NaLaF4∶Er和LaF3∶Er变温上转换发光性能,讨论了524 nm与542 nm处的荧光强度比与温度的依赖关系.

Synthesis and Up-conversion Luminescence Properties of Lanthanum Fluoride in the Ionic Liquid

The ionic liquid (1-butyl 3-methyl imidazolium tetrafluoroborate) was the reaction system and the fluorine source of Lanthanum fluoride,and the effects of raw materials' stoichiometric ratio on the synthesis and morphology were also studied.The reaction mechanism was analyzed.The NaLaF4:Er/Yb and LaF3:Er materials were characterized and analyzed by XRD,SEM and other methods.Under 980 nm excitation,the up-conversion luminescence properties of the sample were measured,and the influence of Er3+ concentration and Yb3+ doping on the up-conversion luminescence properties were analyzed.The up-conversion luminescence properties of NaLaF4:Er and LaF3:Er in a temperature range of 303-583 K were measured.The temperature dependence of the fluorescence intensity ratio of 524 nm and 542 nm was discussed.