Doping-Concentration and Annealing Effects on Photoluminescence Profile of Eu(III)-doped CeO2 nanorods

摘要

Eu(III)-doped CcO2 nanorods were prepared by a co-precipitation method at room temperature, and their photoluminescence profiles were examined with different Eu(III)-doping concentrations and thermal annealing temperatures. Scanning electron microscopy, X-ray diffraction crystallography and UV-Vis absorption spectroscopy were employed to examine the morphology, crystal structure and photon absorption profiles of the nanorods, respectively. Additionally, their 2D and 3D-photoluminescence profile maps were obtained to fully understand the photoluminescence mechanism. We found that the magnetic dipole ~5D0 ->~7F1 and the electric dipole ~5D0 —>~7F2 transitions of Eu(M) were highly dependent on the doping concentration, annealing temperature and excitation wavelength, which was explained by the presence of different Eu(III)-doping sites (with and without an inversion center) in the CeO2 host with a cubic crystal structure.