Abstract
Luminescent material CeF3 was synthesized by a facile and effective microwave- hydrothermal method. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM), BET method and photoluminescence (PL). The results indicated that specific morphology and size of product could be controlled by changing fluorine sources and reaction temperatures. Varing fluorine sources from NH4F to KBF4, hollow CeF3 nanocrystals or multidimensional disk-like CeF3 microcrystals could be obtained respectively. With increasing reaction temperature, the surface areas of samples decreased and sizes and crystalline increased. PL spectra showed that the CeF3 samples exhibited emissions of Ce3+ (5d-4f) and they could achieve not only downconvertion luminescence but also upconvertion luminescence. The luminescence properties were related to not only size and crystalline but also shape. Furthermore, the mechanism of luminescence of the CeF3 samples was proposed and the upconversion luminescence could be deduced to the multi-photon simultaneous absorption luminescence.
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