The optical properties of Yb-doped sol-gel silica glasses were studied by optical absorption and radio-luminescence (RL) measurements, that revealed the typical absorption and emission pattern of Yb<sup>3+</sup> ions. Moreover, RL bands in the 1.5-3.5 eV interval were also observed, and related to defects of the silica matrix. The RL intensity temperature dependence, investigated in the 10-320 K interval, evidenced the presence of the SiO<sub>2</sub> self-trapped exciton emission at 2.2 eV, whose intensity was rapidly quenched by temperature increasing. At variance, the Yb<sup>3+</sup> emission intensity increased markedly by temperature increasing. This phenomenon is interpreted by considering a competitive role of point defects in free carrier trapping, evidenced by parallel wavelength resolved thermally stimulated luminescence measurements. © 2007 Elsevier B.V. All rights reserved.
MORETTI, F., CHIODINI, N., FASOLI, M., LAURIA, A., & VEDDA, A. (2007). Luminescence and defects of Yb3+-doped sol-gel silica glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 353, 486-489.
|Citazione:||MORETTI, F., CHIODINI, N., FASOLI, M., LAURIA, A., & VEDDA, A. (2007). Luminescence and defects of Yb3+-doped sol-gel silica glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 353, 486-489.|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Titolo:||Luminescence and defects of Yb3+-doped sol-gel silica glasses|
|Autori:||MORETTI, F; CHIODINI, N; FASOLI, M; LAURIA, A; VEDDA, A|
|Data di pubblicazione:||2007|
|Rivista:||JOURNAL OF NON-CRYSTALLINE SOLIDS|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.jnoncrysol.2006.08.051|
|Appare nelle tipologie:||01 - Articolo su rivista|