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Simple approach to prepare various sizes of YF3:YbEr nanocrystals in large quantities and their up-converting abilities dependent on preparation times and sodium content are described in this paper. Ionic liquid bmimCl was used in the role of a solvent and NaBF4 as a fluorination agent. Prepared nanocrystals were characterized by XRD, TEM and up-conversion measurements. The method is suitable for...
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