CTAB-assisted hydrothermal synthesis of YVO4:Eu3+ powders in a wide pH range

Rhombus-, rod-, soya bean- and aggregated soya bean-like YVO4:Eu3+ micro- and nanostructures were synthesized by a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method at 180 °C for 24 h in a wide pH range. The as-synthesized powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). The XRD results confirmed the formation of phase-pure YVO4:Eu3+ powders with tetragonal structure under hydrothermal process in a wide pH range. Electron microscopic observations evidenced the morphological transformation of YVO4:Eu3+ powders from rhombus-like microstructure to rod-, soya bean, and aggregated soya bean-like nanostructures with an increase in the pH of the synthesis solution. The results from the PL measurements revealed that the intensities of PL emission peaks were significantly affected by the morphologies and crystallinity of samples due to the absence of an inversion symmetry at the Eu3+ lattice site, and the highest luminescence intensity was observed for rod-like YVO4:Eu3+ powders.

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► YVO4:Eu3+ powders were synthesized by a CTAB-assisted hydrothermal route.
► Phase-pure YVO4:Eu3+ powders were hydrothermally obtained in a wide H range.
► Morphological transformation occurred with the increase in pH value.
► Emission peak intensity was greatly affected by morphology and size.
► Rod-like powders showed the strongest emission intensity.