Vacuum ultraviolet excitation of the 1.9 eV emission band related to nonbridging oxygen hole centers in silica

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Abstract

We investigated the red-luminescence band at 1.9 eV in a gamma ray irradiated synthetic wet silica, under ultraviolet and vacuum-ultraviolet excitations in the temperature range 17–300 K. The excitation profile detected at T517 K evidences a broad band peaked at 6.4 eV, with full width at half maximum of 1.7 eV, besidesthe well-known component at 4.8 eV. On increasing the temperature up to T5300 K, for both ultraviolet and vacuum-ultraviolet excitations, the red luminescence decreases by a factor 10. These results give experimentalsupport to the assignment of the vacuum-ultraviolet absorption transition to a nonbridging oxygen hole center,proposed in a recent paper (T. Suzuki et al., Phys. Rev. Lett. 90, 186404, 2003). Moreover, the thermal quenching of the red-luminescence evidences the activation of a nonradiative relaxation channel inhibiting theradiative emission from the excited state.
Lingua originaleEnglish
pagine (da-a)153201-1-153201-3
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume69
Stato di pubblicazionePublished - 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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