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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Solvent-assisted selective synthesis of NaLaF_4 and LaF_3 fluorescent nanocrystals via a facile solvothermal approach
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Solvent-assisted selective synthesis of NaLaF_4 and LaF_3 fluorescent nanocrystals via a facile solvothermal approach

机译：溶剂热法轻松辅助溶剂合成NaLaF_4和LaF_3荧光纳米晶体

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摘要

A facile solvothermal approach was developed to selectively synthesize water-soluble NaLaF_4 or LaF_3 nanocrystals (NCs) by tuning the solvent components. In ethonal/H_2O media, high-quality LaF_3 NCs were prepared by using NaF and LaCl_3 as the precursors. More interestingly, thermodynamically non-preferred NaLaF_4 nanorods could be obtained when ethylenediamide (EN) was introduced to the ethonal/H_2O solvent. All of the products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the crucial effects of EN on morphology and structure of the NCs were studied. Furthermore, by doping different lanthanide ions, these LaF_3 and NaLaF_4 NCs could emit intense upconversion (UC) or downconversion (DC) fluorescence, which showed potential applications in color displays, light-emitting diodes, optical storage and optoelectronics.
机译：开发了一种简便的溶剂热方法，通过调节溶剂组分来选择性合成水溶性NaLaF_4或LaF_3纳米晶体（NC）。在乙醛/ H_2O介质中，以NaF和LaCl_3为前体制备了高质量的LaF_3 NC。更有趣的是，将乙二酰胺（EN）引入到乙醛/ H_2O溶剂中可以获得热力学上不理想的NaLaF_4纳米棒。所有产品均通过X射线衍射（XRD）和透射电子显微镜（TEM）进行了表征，并研究了EN对NC形态和结构的关键影响。此外，通过掺杂不同的镧系离子，这些LaF_3和NaLaF_4 NC可以发出强烈的上转换（UC）或下转换（DC）荧光，这在彩色显示器，发光二极管，光学存储和光电器件中显示出潜在的应用。

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