Abstract
Pr<sup>3+</sup>/Yb<sup>3+</sup> codoped hexagonal NaYF<sub>4</sub> and tetragonal LiYF4 microcrystals (MCs) were synthesized by hydrothermal method, in which the EDTA was used as a chelating agent. The influence of the crystal phase and electron-phonon interaction on the fluorescence emission of Pr<sup>3+</sup> was investigated. In hexagonal phased NaYF<sub>4</sub>: Yb<sup>3+</sup>/Pr<sup>3+</sup> and tetragonal phased LiYF4: Yb<sup>3+</sup>/Pr<sup>3+</sup> microcrystals, we have observed bright up conversion emission when the samples were excited with 976.4 nm laser. The fluorescence tetragonal LiYF4: Yb<sup>3+</sup>/Pr<sup>3+</sup> microcrystals was weaker and sharper than that from hexagonal NaYF<sub>4</sub>: Yb<sup>3+</sup>/Pr<sup>3+</sup> microcrystals, and a blue shift was observed too. We have also studied the process of up conversion, the influence of crystal phase, and the dopant concentration.
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