Defect chemistry and vacancy concentration of luminescent europium doped ceria nanoparticles by solvothermal method
Thorat, Atul V.
Carolan, Patrick B.
Holmes, Justin D.
Morris, Michael A.
American Chemical Society (ACS)
Pure phase and europium-doped ceria nanocrystals have been synthesized by a single step simple solvothermal process. Different spectroscopic, diffractive, and microscopic techniques were used to determine the morphology, size, crystal structure, and phase of all the samples. Electron energy loss spectroscopy (EELS) for elemental mapping confirmed that good solid solutions were formed and that the particles had a homogeneous distribution of europium. The defect chemistry was more complex than might be expected with the incorporation of each Eu3+ ion resulting in the production of an anion vacancy since the doping results in charge compensating (i.e., for Eu3+) anion vacancies as well as vacancies due to oxygen removal from the crystallite surface. Variations in nanoparticles dimension and lattice parameters were measured as a function of dopant concentrations and their variations explained. The band gap of the samples could be tailored by the doping. The doped samples were found to be luminescent due to the substitution of Ce4+ ions in the cubic symmetric lattice by the dopant ions. The thermal stability of the fluorescence properties was also investigated.
Ceria , Europium , Defects , Doping , EELS , Luminescence , Nanoparticles , Surface defects , Ions , Electron energy loss spectroscopy , Doping (additives)
Thorat, A. V., Ghoshal, T., Carolan, P., Holmes, J. D. and Morris, M. A. (2014) 'Defect Chemistry and Vacancy Concentration of Luminescent Europium Doped Ceria Nanoparticles by the Solvothermal Method', The Journal of Physical Chemistry C, 118(20), pp. 10700-10710. doi: 10.1021/jp410213n
© 2014 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C , copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/jp410213n