Photoluminescence of C-doped sol-gel-derived Al₂O₃-SiO₂ glasses

Abstract

Photoluminescence (PL) and luminescence quantum yield of sol-gel-derived Al₂O₃-SiO₂ glasses were investigated. The PL spectra composed of two bands peaking at 410nm and 520nm. The 520nm-band, assigned to be carbon radical, increased its intensity with increasing the heat-treatment temperature, reaching a maximum value at 500°C. The incorporation of Al₂O₃, was effective to form the carbon-radical. The internal and external luminescence quantum yields were ∼60% and ∼16% for the Al₂O₃-SiO₂ glass heated at 500°C