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Controlled synthesis and morphology dependent upconversion luminescence of NaYF4 : Yb, Er nanocrystals

机译:NaYF4:Yb,Er纳米晶的受控合成和依赖形态的上转换发光

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摘要

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.
机译:通过水热法合成了尺寸和形貌受控的NaYF4:Yb,Er纳米晶体。多齿配体,例如EDTA和柠檬酸盐,被用于合成立方和六边形Yb3 +,Er3 +共掺杂的NaYF4纳米晶体,作为控制纳米晶体尺寸和形态的一种手段。随后,发现粒度取决于成核速率,成核速率又取决于反应物浓度,摩尔比和配体的选择。发现从立方到六方的相变对反应时间和反应物浓度敏感。纳米晶体的上转换光致发光表现出形态学依赖性,这提供了表征其晶体质量和结构的手段。

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