Open AccessSite symmetry and host sensitization-dependence of Eu3+ real time luminescence in tin dioxide nanoparticles
Author(s) -
C. Cascales,
Rolindes Balda,
Sara Garcı́a-Revilla,
Luís Lezama,
Macarena Barredo-Zuriarrain,
José Rodríguez Fernández
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.016155
Subject(s) - tin dioxide , excited state , materials science , luminescence , persistent luminescence , nanocrystal , tin , doping , nanoparticle , atomic physics , nanotechnology , thermoluminescence , optoelectronics , physics , metallurgy
The present work gives a detailed investigation of the dependence of the real time luminescence of Eu 3+ -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 SnO 2 matrix. A lower limit for the host-RE energy transfer rate and a model for the excitation mechanism are given.