Crystal Chemistry and Luminescence Properties of Eu-Doped Polycrystalline Hydroxyapatite Synthesized by Chemical Precipitation at Room Temperature

Europium-doped hydroxyapatite Ca-10(PO4)(6)(OH)(2) (3% mol) powders were synthesized by an optimized chemical precipitation method at 25 degrees C, followed by drying at 120 degrees C and calcination at 450 degrees C and 900 degrees C. The obtained nanosized crystallite samples were investigated by means of a combination of inductively coupled plasma (ICP) spectroscopy, powder X-ray diffraction (PXRD), Fourier Transform Infrared (FTIR), Raman and photoluminescence (PL) spectroscopies. The Rietveld refinement in the hexagonal P6(3)/m space group showed europium ordered at the Ca2 site at high temperature (900 degrees C), and at the Ca1 site for lower temperatures (120 degrees C and 450 degrees C). FTIR and Raman spectra showed slight band shifts and minor modifications of the (PO4) bands with increasing annealing temperature. PL spectra and decay curves revealed significant luminescence emission for the phase obtained at 900 degrees C and highlighted the migration of Eu from the Ca1 to Ca2 site as a result of increasing calcinating temperature.