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 [10.1016/j.jlumin.2006.11.009].

Optical absorption and emission properties of Gd3+ in silica host

MORETTI, FEDERICO;CHIODINI, NORBERTO;FASOLI, MAURO;VEDDA, ANNA GRAZIELLA
2007

Abstract

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 Gd3+ absorption/emission lines by densification temperature increasing accompanied by a parallel increase of Gd3+ 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 Gd3+ emission. Moreover, RL spectra of fully densified samples display high-energy shoulders on the 6P7/2-8S Gd3+ emission possibly related to crystal field splitting of the 6P7/2 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 6P7/2 state to higher crystal field states and their subsequent radiative recombination. © 2006 Elsevier B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
silica, scintillation, defects, optical absorption
English
2007
127
759
763
none
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 [10.1016/j.jlumin.2006.11.009].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/13653
Citazioni
  • Scopus 24
  • ???jsp.display-item.citation.isi??? 21
Social impact