Abstract
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.
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