Abstract
Ln3+-doped NaYF4 nanocrystals were synthesized by a facile citric acid-assisted solvothermal process. The effect of citric acid on the morphology and crystalline structure of the products was investigated, and the luminescence and fluorescence properties of the products were examined. Results show that citric acid plays a key part in controlling product morphology. As-synthesized cubic phase NaYF4 nanocrystals with narrow size (around 50nm) could be an excellent host material for different doped lanthanide ions. Yb3+/Er3+ co-doped NaYF4 nanocrystals show strong up-conversion luminescence under 980nm of continuous wave diode laser excitation, showing potential application as phosphors.
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