Abstract
A high temperature solution system with BaCO3/RECl3·xH2O in oleic acid/1-octadecene has been developed to prepare barium rare earth fluoride nanocrystals: tetragonal phase of BaREF5 (RE = Pr, Nd, Eu, Tb, Dy, Tm, Lu, Y), pure cubic phase Ba2REF7 (RE = La, Sm, Ho, Er, Yb), and BaREF5 (RE = Ce, Gd) colloidal nanocrystals. In addition, it is proved that the functionalization of these nanocrystals by means of doping with Eu, Tb, and Yb, Er/Tm ion pair can obtain red, green, and visible-to-the-naked-eye green/blue upconversion emissions.
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