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The hexagonal and monoclinic phase LaPO 4 and LaPO 4 :Eu nanostructures have been controllably synthesized by a citrate-induced hydrothermal process at 100 °C. The crystal growth of LaPO 4 nanostructures was investigated, and the phase transformation of nanostructured LaPO 4 was systematically studied by varying the citrate concentration, pH value and reaction temperature. When 0.8 mmol of citrate was added into the reaction system, the hexagonal phase LaPO 4 transformed into the monoclinic phase. High concentrations of citrate would lead to the formation of hexagonal phase LaPO 4 . The photoluminescence properties of the monoclinic phase LaPO 4 :Eu prepared using a citrate-induced process demonstrate that the electric dipole transition ( 5 D 0 → 7 F 2 ) is stronger than the magnetic dipole transition ( 5 D 0 → 7 F 1 ), which indicated that Eu 3+ is in a site with no inversion center. The strongest emission peak of hexagonal phase LaPO 4 :Eu comes from 5 D 0 → 7 F 1 . Furthermore, the citrate-induced hexagonal phase LaPO 4 :Eu has a stronger emission intensity than the hexagonal phase LaPO 4 :Eu prepared not using a citrate-induced process.

Influence of citrate on phase transformation and photoluminescence properties in LaPO4 and LaPO4:Eu

Influence of citrate on phase transformation and photoluminescence properties in LaPO₄ and LaPO₄:Eu