Abstract
Lanthanum phosphate LaPO4 nanocrystals doped with Yb3+, Tb3+ and Eu3+ ions, were synthesised by a hydrothermal method followed by annealing at 900 °C. These materials exhibited bright and tunable up-conversion luminescence from green to red colour as the result of Tb3+ and Eu3+ ions emission. The structural and morphological properties of the products were analysed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The spectroscopic properties of LaPO4:Yb3+,Tb3+,Eu3+ nanocrystals were investigated using excitation and emission spectra. Also the luminescence decays were measured showing an unusually long rise time of the luminescence as a result of cooperative energy transfer mechanisms (CET) followed by energy migration. Calculated energy transfer rates and efficiencies showed the effectiveness of energy transfer between Yb3+, Tb3+ and Eu3+ ions.
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