Visible-ultraviolet vibronic emission of silica nanoparticles

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Abstract

We report the study of the visible-ultraviolet emission properties and the structural features of silicananoparticles prepared through a laboratory sol–gel technique. Atomic force microscopy, Raman andInfrared investigations highlighted the 10 nm size, purity and porosity of the obtained nanoparticles. Byusing time resolved photoluminescence techniques in air and in a vacuum we were able to single outtwo contributions in the visible emission: the first, stable in both atmospheres, is a typical fast blue bandcentered around 2.8 eV; the second, only observed in a vacuum around the 3.0–3.5 eV range, is a vibrationalprogression with two phonon modes at 1370 cm-1 and 360 cm-1. By fully characterizing thespectroscopic features of this structured emission, we determine its vibronic properties and clarify thedifferent origins with respect to the blue luminescent defect.
Original languageEnglish
Pages (from-to)22028-22034
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume16
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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