Effects of Eu3+ ions on the morphology and luminescence properties of hydroxyapatite nanoparticles synthesized by one-step hydrothermal method

In the present investigation, we have demonstrated the synthesis of sphere shaped HA phosphors by a simple one-step hydrothermal method, and the structural, morphological, textural and optical properties were characterized by XRD, TEM, XPS, ICP and PL spectroscopy. Results showed that the crystal size and the ratio of length to radius of Eu3+-doped HA particles decreased with the increasing of Eu3+doped concentration, and its PL emission intensities increased with the increase of Eu3+doped concentration. When the Eu3+ amount was 7.5 at.%, the HA particle showed sphere shape, and the actual doping concentration and the PL emission intensities reach the maximum. This indicated that sphere shaped HA phosphors can be obtained by adjusting the Eu3+ doping concentration without adding any other reagent. And it also indicated that the PL emission intensities were mainly dependent on the Eu3+ doped concentration, and the effect of morphology was very little.

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► Sphere shape Eu3+-doped HA were prepared by one-step hydrothermal method.
► Crystal morphology will change from rod to sphere by increasing Eu3+ concentration.
► When the Eu3+ amount was 7.5 at.%, the PL emission intensities reached the maximum.