Abstract
CeF 3 and CeF 3:Tb 3+ nanocrystals were successfully synthesized through a facile and effective polyol-mediated route with ethylene glycol (EG) as solvent. Various experimental techniques including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and photoluminescence (PL) spectra as well as decay dynamics were used to characterize the samples. The results indicated that the content of NH 4F and reactant concentrations were key factors in the product shape and size. Excessive NH 4F was necessary for the formation of hexagonal nanoplates. The specific morphology of product can be controlled by changing the NH 4F content and reactant concentrations. In addition, Tb 3+ doped-CeF 3 sample shows strong green emission centered at 544 nm corresponding to the 5 D 4– 7 F 5 transition of Tb 3+. Due to the decrease of nonradiative decay rate, the lifetime of 5 D 4 level of Tb 3+ become longer gradually upon increasing the size of product.
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