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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:04 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Solid State Physics and Materials Science
Title:
Cubic and low symmetry centres in Eu3+/Sm3+ doped CeO2 nanoparticles: a micro-Raman and luminescence spectroscopic study
Authors:
Daniel Avram and Carmen Tiseanu
Affiliation:
National Institute for Laser, Plasma and Radiation Physics, P.O.Box MG-36, RO 76900, Bucharest-Magurele, Romania
E-mail
radu.avram@inflpr.ro
Keywords:
Ceria, Lanthanides, Luminescence
Abstract:
Ceria doped with Eu3+ or Sm3+ with concentrations of 1, 5 and 10 wt.% were investigated by steady-state, time-resolved photoluminescence (PL) and Raman spectroscopies as well as X-ray diffraction (XRD). The emission properties of all Eu3+/Sm3+ -doped ceria samples grown by three different methods were investigated function of dopant concentration, nanoparticle size and synthesis route whereas correlation and interference between the vibrational properties of ceria host and luminescence properties of Eu3+/Sm3+ dopant were determined by use of Raman spectra measured in the whole range of 0-4000 cm-1. The major findings of the presentation, which are detailed in my dissertation thesis, indicate that the characteristic emission and excitation spectra of the two main Eu3+/Sm3+ centres as well as the overall multisite distribution of Eu3+/Sm3+ on CeO2 lattice are intrinsic properties of Eu3+/Sm3+ -doped ceria and therefore do not depend on synthesis route, nanoparticle size and Eu3+ concentration. Also, the interactions between the trivalent dopant and oxygen defects in CeO2 appear stronger for Eu3+ in comparison with Sm3+, a phenomenon which is related mainly to the enhanced sensitivity of the electronic transitions of Eu3+ to its local environment.
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