Two variants of the surface-nonbridging oxygen hole center, („Si–O)3Si–O and („Si–O)2(H–O)Si–O , stabilized in porous films of silica nano-particles were investigated by time resolved luminescence excited in the visible and UV spectral range by a tunable laser system. Both defects emit a photoluminescence around 2.0 eV with an excitation spectrum evidencing two maxima at 2.0 and 4.8 eV, this emission decreases by a factor 2 on increasing the temperature from 8 up to 290 K. However, the different local structure influences the emission lineshape, the quantum yield and the decay
Vaccaro, L., Cannas, M., Radzig, V. (2009). Luminescence properties of nonbridging oxygen hole centers at the silica surface. JOURNAL OF PHYSICS. CONDENSED MATTER, 355, 1020-1023 [10.1016/j.jnoncrysol.2008.11.028].
Luminescence properties of nonbridging oxygen hole centers at the silica surface
VACCARO, Lavinia;CANNAS, Marco;
2009-01-01
Abstract
Two variants of the surface-nonbridging oxygen hole center, („Si–O)3Si–O and („Si–O)2(H–O)Si–O , stabilized in porous films of silica nano-particles were investigated by time resolved luminescence excited in the visible and UV spectral range by a tunable laser system. Both defects emit a photoluminescence around 2.0 eV with an excitation spectrum evidencing two maxima at 2.0 and 4.8 eV, this emission decreases by a factor 2 on increasing the temperature from 8 up to 290 K. However, the different local structure influences the emission lineshape, the quantum yield and the decay
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