Formation of Photoluminescent Lead Bromide Nanoparticles on Aluminoborosilicate Glass

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Abstract

A multicomponent aluminoborosilicate photoluminescent glass was synthesized by introducing Pb(II) and NaBr in its composition. The room temperature photoluminescence is due to the existence of 4 nm nanocrystals, shown using TEM imaging and XRD analysis, which are assigned to PbBr2nanocrystals. The glasses display a broad emission band with a peak at 2.85 eV by exciting at 3.35 eV, with anisotropy equal to 0.19 at room temperature. At 77 K the emission intensity increases one-order of magnitude and vibronic structure appears indicating an electron-phonon coupling with the glass matrix. Time-resolved luminescence measurements of these nanocrystals reveal mixed-order kinetics, with 2nd order recombination of self-trapped electron centers and a 1st order temperature-dependent non-radiative rate constant connected with pathways due to confinement of self-trapped centers.
Original languageEnglish
Pages (from-to)12436-12442
JournalJournal of Physical Chemistry C
Volume118
Issue number23
DOIs
Publication statusPublished - 12 Jun 2014

Keywords

  • HALIDE PHOTOCHROMIC-GLASSES
  • SILICATE-GLASSES
  • ELECTRON-TRANSFER
  • BORATE GLASSES
  • RAMAN
  • LUMINESCENCE
  • MELTS
  • MECHANISM
  • SPECTROSCOPY
  • CRYSTALS

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