Preparation and characterization of Eu~(3+)-doped fluorapatite nanoparticles by a hydrothermal method

摘要

In this study, luminescent Eu~(3+)-doped fluorapatite (Eu~(3+):FA) was successfully synthesized by a hydrothermal process by using Na_2EDTA/citric acid (CA) as the chelating agent. X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence spectra (PL) were utilized to characterize the obtained nanoparticles. The results showed that Eu~(3+) ions entered the FA lattice and occupied Ca~(2+) sites, which resulted in a decrease in the values of the lattice parameters. The as-prepared luminescent samples exhibit sphere-like aggregates that are constructed of small nanosphcrcs and that are well dispersed with a good size distribution. Upon excitation by UV radiation, the Eu~(3+) :FA samples demonstrate the characteristic ~5D_0-~7F_(1-2) emission lines of Eu~(3+). finally, the influence of Na_2EDTA/CA on the morphology of Eu~(3+) :FA nanopowder was also discussed.