The effect of sintering on the optical properties of silica nanoparticles, a mean diameter of ~14 nm, are investigated by absorption and luminescence experiments. The sintering is induced by a thermal treatment of 1000 °C for 272 hours; after that the sample is transparent, and emits a bright luminescence under UV excitation. Time resolved photoluminescence spectra excited by a tunable laser source allows to evidence four bands around 2.0 eV, 2.4 eV, 2.7 eV and 3.4 eV, peculiar to defects induced by the sintering.
Vaccaro, L.; Cangialosi, C.; Spallino, L.; Cannas, M.; Gelardi, F.M.; Boscaino, R. (16/06/2014-18/06/2014).Luminescence properties induced by sintering of silica nanoparticles.
Luminescence properties induced by sintering of silica nanoparticles
VACCARO, Lavinia;CANGIALOSI, Chiara;SPALLINO, Luisa;CANNAS, Marco;GELARDI, Franco Mario;BOSCAINO, Roberto
Abstract
The effect of sintering on the optical properties of silica nanoparticles, a mean diameter of ~14 nm, are investigated by absorption and luminescence experiments. The sintering is induced by a thermal treatment of 1000 °C for 272 hours; after that the sample is transparent, and emits a bright luminescence under UV excitation. Time resolved photoluminescence spectra excited by a tunable laser source allows to evidence four bands around 2.0 eV, 2.4 eV, 2.7 eV and 3.4 eV, peculiar to defects induced by the sintering.
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