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Site symmetry and host sensitizationdependence of Eu3+ real time luminescence in tin dioxide nanoparticles

AuthorsCascales, Concepción ; Balda, Rolindes ; García-Revilla, Sara; Lezama, Luis; Barredo-Zuriarrain, Macarena; Fernández, Joaquín
Issue Date2018
PublisherOptical Society of America
CitationOptics Express 26(13): 16155-16170 (2018)
AbstractThe present work gives a detailed investigation of the dependence of the real time luminescence of Eu3+-doped tin dioxide nanopowder on rare earth (RE) site symmetry and host defects. Ultrafast time-resolved analysis of both RE-doped and undoped nanocrystal powder emissions, together with electronic paramagnetic resonance studies, show that host-excited RE emission is associated with RE-induced oxygen vacancies produced by the non-isoelectronic RE-tin site substitution that are decoupled from those producing the bandgap excited emission of the SnO2 matrix. A lower limit for the host-RE energy transfer rate and a model for the excitation mechanism are given.
Publisher version (URL)https://doi.org/10.1364/OE.26.016155
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