Luminescence properties of nonbridging oxygen hole centers at the silica surface

Marco Cannas, Lavinia Vaccaro, Vaccaro, Viktor Radzig

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Two variants of the surface-nonbridging oxygen hole center, („Si–O)3Si–O and („Si–O)2(H–O)Si–O,stabilized in porous films of silica nano-particles were investigated by time resolved luminescenceexcited in the visible and UV spectral range by a tunable laser system. Both defects emit a photoluminescencearound 2.0 eV with an excitation spectrum evidencing two maxima at 2.0 and 4.8 eV, this emissiondecreases by a factor 2 on increasing the temperature from 8 up to 290 K. However, the different localstructure influences the emission lineshape, the quantum yield and the decay
Original languageEnglish
Pages (from-to)1020-1023
Number of pages4
JournalJOURNAL OF PHYSICS. CONDENSED MATTER
Volume355
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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