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Optical detection of metastable H 2 − defects and photoconversion of anion vacancies in thermochemically reduced CaO crystals

1987; American Physical Society; Volume: 36; Issue: 2 Linguagem: Inglês

10.1103/physrevb.36.1244

1095-3795

V. M. Orera, Yi Chen,

Gas Sensing Nanomaterials and Sensors

The localized vibrational modes and electronic transitions of ${\mathrm{H}}^{2\mathrm{\ensuremath{-}}}$ defects in thermochemically reduced CaO crystals have been detected. The cause of the long-lived luminescence of the F center at room temperature is shown to be due directly to release of electrons from metastable ${\mathrm{H}}^{2\mathrm{\ensuremath{-}}}$ defects. Photoconversion between F and ${F}^{+}$ centers involves electron transfer via the reversible process ${\mathrm{H}}^{\mathrm{\ensuremath{-}}}$+${\mathrm{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\leftrightarrows}${\mathrm{H}}^{2\mathrm{\ensuremath{-}}}$. .AE