| Summary: | Luminescence properties of europium-doped Ca<sub>10-x</sub>Eu<sub>x</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub> (x<sub>Eu</sub> = 0, 0.01, 0.02, 0.10 and 0.20) and gadolinium-doped hydroxyapatite Ca<sub>9.80</sub>Gd<sub>0.20</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub> (HA), synthesized via solid-state reaction at T = 1300 °C, were investigated using scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR), and luminescence spectroscopy. Crystal structure characterization (from unit cell parameters determination to refined atomic positions) was achieved in the <i>P</i>6<sub>3</sub>/<i>m</i> space group. FTIR analyses show only slight band shifts of (PO<sub>4</sub>) modes as a function of the rare earth concentration. Structural refinement, achieved via the Rietveld method, and luminescence spectroscopy highlighted the presence of dopant at the Ca2 site. Strong luminescence was observed for all Eu- and Gd-doped samples. Our multi-methodological study confirms that rare-earth (RE)-doped synthetic hydroxyapatites are promising materials for bio-imaging applications.
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