Abstract
Novel monodisperse BaCeF5 and BaCeF5: Tb3+, Sm3+ nanocrystals have been successfully synthesized by a simple one-step solvothermal synthesis. Uniformly distributed nanocrystals with an octahedral morphology and particle size of 75-80 nm were observed. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), photo-luminescence (PL), and decay studies were employed to characterize the samples. Under ultraviolet irradiation, the BaCeF5: Tb3+, Sm3+ samples exhibit the typical green emission band of the Tb3+ ions, as well as an orange-red and red emission bands of the Sm3+ ions in the presence of Ce3+ ions. The highly intense orange-red and red emission bands of the Sm3+ ions were attributed to the effective energy transfer from the Tb3+ to Sm3+ ions, which has been justified through the luminescence spectra and the fluorescence decay dynamics. The luminescence colors of BaCeF5: Tb3+, Sm3+ nanophosphors can be easily tuned by changing the concentration of Sm3+ ions. These results suggest that BaCeF5: Tb3+, Sm3+ nanocrystals can be explored for three-dimensional displays, back lighting, white light sources, and so on.
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