Controlled synthesis and morphology dependent upconversion luminescence of NaYF4:Yb, Er nanocrystals
Controlled synthesis and morphology dependent upconversion luminescence of NaYF4:Yb, Er nanocrystals
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NaYF4:Yb、Er 纳米晶体的受控合成和形态依赖性上转换发光
DOI：
10.1088/0957-4484/18/27/275609
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发表时间：
2007-07-11
期刊：
影响因子：
3.5
通讯作者：
Zhang, Hong
中科院分区：
文献类型：
--
作者：
Sun, Yajuan;Chen, Yue;Zhang, Hong
采用水热法合成了尺寸和形貌可控的NaYF4：Yb，Er纳米晶。采用EDTA和柠檬酸盐等多齿配体合成了立方和六方结构的Yb 3+，Er 3+共掺杂NaYF4纳米晶，作为控制纳米晶尺寸和形貌的一种手段。随后，发现粒径取决于成核速率，而成核速率又受反应物浓度、摩尔比和配体选择的影响。从立方相到六方相的相变被发现是敏感的反应时间和反应物浓度。纳米晶体的上转换光致发光表现出形态依赖性，这提供了一种手段来表征其晶体质量和结构。
Size and morphology controlled NaYF4:Yb, Er nanocrystals were synthesized via the hydrothermal method. Polydentate ligands, such as EDTA and citrate, were used in the synthesis of cubic and hexagonal Yb3+, Er3+ codoped NaYF4 nanocrystals as a means of controlling the size and morphology of the nanocrystals. Subsequently, the particle size was found to be dependent on the nucleation rate, which, in turn, was governed by the reactant concentration, molar ratio and choice of ligand. The phase transformation from cubic to hexagonal was found to be sensitive to reaction time and reactant concentration. The upconversion photoluminescence of the nanocrystals demonstrated morphology dependence, which provides a means to characterize their crystalline quality and structure.