Photophysical characterization of La_(1-x)Eu_xBO_3 and La_(1-x)Eu_xBO_3 nanopowders synthesized by sol-gel Pechini method

摘要

Lanthanum orthoborates doped with Eu~(3+) or Tb~(3+) were obtained by a modified Pechini method using eth-ylene glycol and citric acid as chelating and cross-linking reagents. Crystal structure, morphology and grain size of the obtained nanopowders were determined using XRD (X-ray diffraction), EDX (Energy-dispersive X-ray spectroscopy) and TEM (transmission electron microscopy) analysis. Photophysical properties of the nanopowders obtained were studied by luminescence excitation and emission spectra, luminescence decay curves and calculated Judd-Ofelt parameters. In an attempt to optimize the conditions of synthesis, the dependence of physicochemical properties on calcination temperature was analysed.