Optical and ESR Studies on SnO2 Nanoparticles Doped with Dy3+ Ions
Abstract:Dy-doped SnO2 nanoparticles were prepared by sol–gel technique. X-ray diffraction, high resolution transmission electron microscopy (HRTEM) demonstrate that the as-obtained nanoparticles could be indexed to tetragonal rutile structure and do not show any other impurity peaks. The Dy-doped SnO2 nanoparticles were spherical and are well-dispersed with narrow size distribution. The diameter of the nanoparticles are about 2 nm from the HRTEM analysis. A considerable red shift in the optical absorption edge was observed with increasing of Dy content. The photoluminescence spectroscopy of SnO2:Dy exhibit blue emission with increasing intensity compared to undoped SnO2 nanoparticles. The ESR spectra of Dy-doped SnO2 nanoparticles exhibit single resonance signal with effective value of g = 1.96. The resonance signal is attributed to isolated Dy3+ ions.
Document Type: Research Article
Publication date: December 1, 2010
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