Preparation and Photoluminescence Properties of Eu 2+ -Doped Oxyapatite-Type Sr x La 10− x (SiO 4 ) 6 O 3− x /2

Eu 2+ -doped oxyapatite Sr x La 10−x (SiO 4 ) 6 O 3−x/2 phosphors are prepared by solid-state reaction at high temperatures under reducing atmosphere. Their crystal structures and photoluminescence are investigated by x-ray diffraction (XRD) and fluorescence spectroscopy, respectively. The XRD results indicate that the samples are pure oxyapatite phase (P6 3 /m space group). The fluorescence spectra show two peaks corresponding to two sites (4f and 6h sites) for Eu 2+ in the host lattice. As the Eu 2+ content influences the intensity ratio of the two observed emission peaks, the photoluminescence mechanism is discussed.