Luminescence of the surface nonbridging oxygen hole center in silica: Spectral and decay properties

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55 Citazioni (Scopus)

Abstract

We investigated the red luminescence in a porous film of silica nanoparticles, originating from surface nonbridging oxygen hole centers. The excitation spectrum was measured from 1.8 to 8.0 eV by a tunable laser system and a synchrotron radiation source; this spectrum evidences a peak at 2.0 eV, nearly overlapping withthe emission, and an ultraviolet broadband with peaks at 4.8 and 6.0 eV. The emission is characterized by a spectrum with two subbands split by 0.07 eV, its decay occurs with lifetime longer than 30 microsec and undergoesa thermal quenching by a factor aboout 2 with increasing temperature from 10 to 290 K. The optical characteristics of surface and bulk centers are discussed on the basis of the reported experimental results and quantumchemical calculations.
Lingua originaleEnglish
pagine (da-a)075421-1-075421-6
Numero di pagine6
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume78
Stato di pubblicazionePublished - 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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