Abstract
Cubic nano-spheres and hexagonal microprisms of sodium yttrium tetrafluoride (NaYF 4) have successfully been prepared separately via a mild hydrothermal route. The morphology and the structure of the NaYF 4 crystals can be changed by adjusting the Y 3+/F − ratio in the reaction solution. Cubic NaYF 4 nano-spheres are synthesized when the Y 3+/F − ratio is stoichiometric; while hexagonal NaYF 4 microprisms appear as excess F − is present at 180 °C for more than 5 h. Ethylenediamine tetra-acetic acid (EDTA) plays an important role as a chelating ligand, and F − acts as both a reactant and a mineralizer during the synthesis process. A growth mechanism is discussed.
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