We present a study of the optical properties of Gd-doped sol-gel silica glasses densified at different temperatures (from 450 up to 1050 °C) by means of optical absorption (OA) and radio luminescence (RL). The effect of a post-densification rapid thermal treatment (RTT) at approximately 1800 °C is also considered. Room temperature OA and RL measurements have revealed a slight low-energy shift of Gd<sup>3+</sup> absorption/emission lines by densification temperature increasing accompanied by a parallel increase of Gd<sup>3+</sup> RL intensities, especially strong after RTT. These effects are interpreted on the basis of structural modifications of the silica matrix and of the removal of non-radiative channels competing with Gd<sup>3+</sup> emission. Moreover, RL spectra of fully densified samples display high-energy shoulders on the <sup>6</sup>P<sub>7/2</sub>-<sup>8</sup>S Gd<sup>3+</sup> emission possibly related to crystal field splitting of the <sup>6</sup>P<sub>7/2</sub> state. This interpretation is supported by the temperature dependence of RL spectra, investigated in the 10-320 K temperature interval: an increase of the intensity of high-energy components vs. temperature has been observed, which can be interpreted as due to thermally assisted excitation of electrons belonging to the lower <sup>6</sup>P<sub>7/2</sub> state to higher crystal field states and their subsequent radiative recombination. © 2006 Elsevier B.V. All rights reserved.
MORETTI, F., CHIODINI, N., FASOLI, M., Griguta, L., & VEDDA, A. (2007). Optical absorption and emission properties of Gd3+ in silica host. JOURNAL OF LUMINESCENCE, 127, 759-763.
|Citazione:||MORETTI, F., CHIODINI, N., FASOLI, M., Griguta, L., & VEDDA, A. (2007). Optical absorption and emission properties of Gd3+ in silica host. JOURNAL OF LUMINESCENCE, 127, 759-763.|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Titolo:||Optical absorption and emission properties of Gd3+ in silica host|
|Autori:||MORETTI, F; CHIODINI, N; FASOLI, M; Griguta, L; VEDDA, A|
|Data di pubblicazione:||2007|
|Rivista:||JOURNAL OF LUMINESCENCE|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.jlumin.2006.11.009|
|Appare nelle tipologie:||01 - Articolo su rivista|