Abstract
CaF2:Ln3+ (Ln = Ce, Tb, Eu) phosphors with highly uniform shapes have been successfully synthesized by a simple hydrothermal method directly. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and lifetime. The results indicated that the pH values, organic additive and reaction time have a significant effect on the morphology and dimensions of CaF2 microcrystals and the possible formation mechanism was also proposed. Furthermore, the energy transfer from Ce3+ to Tb3+ and from Tb3+ to Eu3+ and from Ce3+ to Tb3+ to Eu3+ was observed and the corresponding mechanisms were discussed in detail. The CaF2:Ln3+ phosphors may have potential optical applications in near-UV and violet LEDs.
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