Comprehensive studies of the Li+ effect on NaYF4: Yb/Er nanocrystals: morphology, structure, and upconversion luminescence
Comprehensive studies of the Li+ effect on NaYF4: Yb/Er nanocrystals: morphology, structure, and upconversion luminescence
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Li对NaYF4: Yb/Er纳米晶体影响的综合研究：形态、结构和上转换发光
DOI：
10.1039/c7dt01820g
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发表时间：
2017-07-28
影响因子：
4
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
Wang, Xiuwen;Zhang, Xi;Huang, Wei
杂质掺杂在改变目标纳米材料的设计形态、晶体结构和功能方面发挥着关键作用。在这项工作中，我们全面研究了Li+掺杂对NaYF4:Yb/Er纳米晶体的形貌、晶体结构和上转换发光的影响。使用不同的 Li+ 源，例如 LiOA 和 LiOH，Li+ 掺杂浓度在 0 至 100 mol% 之间变化。最终产物从六方NaYF4:Yb/Er转变为立方NaYF4:Yb/Er和四方LiYF4:Yb/Er的混合物，最后变成纯四方LiYF4:Yb/Er。更重要的是，在0.5 mol% Li+的超低浓度掺杂下，可实现高达34倍的绿光和101倍的红光发射增强。
Impurity doping plays a critical role in altering the properties of target nanomaterials in terms of designed morphologies, crystal structures, and functionalities. In this work, we have performed a comprehensive investigation of the effect of Li+ doping on the morphology, crystal structure, and upconversion luminescence of NaYF4:Yb/Er nanocrystals. Different Li+ sources, e.g., LiOA and LiOH, were used and the Li+ doping concentration varied from 0 to 100 mol%. The final product changes from hexagonal NaYF4:Yb/Er to the mixture of cubic NaYF4:Yb/Er and tetragonal LiYF4:Yb/Er, and finally to pure tetragonal LiYF4:Yb/Er. More importantly, at an ultra-low concentration of 0.5 mol% Li+ doping, as high as 34 times green and 101 times red emission enhancements are achieved.