Abstract
The low efficiency of upconversion luminescence hinders the pratical applications in many optical fields. During the past years, much attention have focused on the fluorides, reports of lanthanum vanadate (LaVO4) in oxides are scarce. Herein, a series of LaVO4:Yb3+/Er3+ crystals codoping with Ba2+ ions are synthesized through one-pot facile hydrothermal route. Many instruments, such as XRD, ICP, TEM equipped with EDS, luminescence spectroscopy are applied to characterize the products. By optimizing the impurity doping content to 15 mol%, the upconversion luminescence intensities of the green and red emissions are enhanced by 23 and 25 times, respectively. A formation mechanism for morphology evolution is proposed. The enhancement of upconversion performance are systematacially investigated upon the grain size, crystal structure symmetry and doping concentration. Moreover, additional operations are carried out by DFT calculations to confirm the experimental result. This work will guide to enhance upconversion performance based on lanthanum vanadate nanocrystals through impurity doping, which may realize the prospective applications in many fields.
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