Abstract
Microwave-assisted hydrothermal method was used to synthesise single phase sub-microcrystalline BiVO4:Tm3+ powders with two polymorphic crystal structures – tetragonal zircon-type phase (I41/amd) or monoclinic fergusonite-type phase (I2/b). A single tetragonal phase of BiVO4:Tm3+ was obtained at alkaline pH and it was maintained after annealing up to 400°C, while a single monoclinic phase at acidic pH and in the annealing temperature range of 600-900°C. The structural properties of both phases were correlated with their optical properties, such as the energy gap and luminescent properties. It was observed that the crystal structure and the decreasing the crystallites size changes the bandgap value for BiVO4:Tm3+. The NIR luminescence of Tm3+ ions analysed for both structural phases of the samples with the smallest crystallites sizes showed that the emission intensity is higher for the monoclinic phase than for the tetragonal phase.
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