Wang Xiangfu, Wang Ye, Yu Jihong, Bu Yanyan, Yan Xiaohong
Opt Express. 2018 Aug 20;26(17):21950-21959. doi: 10.1364/OE.26.021950.
An efficient soft chemistry method to modify the phase, shape and optical thermometry of NaGdF:2%Er nano-phosphors through doping Ca ion is reported. With the introduction of Ca, the phase changes from the GdF:2%Er to NaGdF:2%Er was achieved, and the shapes of NaGdF:2%Er were modified from irregular particles to pure hexagonal NaGdF microtubes. These modifications derive from the charge redistribution on the nucleus surface through internal electron charge transport between Gd in a lattice and co-doped Ca ion. An obvious enhancement of the total fluorescence intensity was observed after doping the Ca ion. Moreover, an interesting phenomenon was observed that the fluorescence intensity of the mixed GdF:2%Er and NaGdF:2%Er was not be quenched at the high temperature more than 473 K. A maximum relative sensitivity of 0.00213/K (416 K) was obtained at 20%Ca doping. These results indicate that NaGdF:Er/Ca can be applied in optical temperature sensor.
报道了一种通过掺杂钙离子来修饰NaGdF:2%Er纳米磷光体的相、形状和光学测温性能的高效软化学方法。随着钙的引入，实现了从GdF:2%Er到NaGdF:2%Er的相转变，并且NaGdF:2%Er的形状从不规则颗粒转变为纯六方NaGdF微管。这些修饰源于通过晶格中钆与共掺杂钙离子之间的内部电子电荷传输在核表面上的电荷重新分布。掺杂钙离子后观察到总荧光强度明显增强。此外，观察到一个有趣的现象，即混合的GdF:2%Er和NaGdF:2%Er的荧光强度在高于473 K的高温下没有淬灭。在20%钙掺杂时获得了0.00213/K（416 K）的最大相对灵敏度。这些结果表明NaGdF:Er/Ca可应用于光学温度传感器。
