Fluorine modified amorphous silica has been synthetized via sol-gel route and studied through analysis of the temperature dependence of the Urbach absorption tail in the vacuum-ultraviolet region. The modified glass has a steep absorption edge above 8 eV, with the absorption coefficient alpha proportional to exp[E/E-U(T)] showing Urbach energy values E-U(T) ranging between 50 and 66 meV. The comparison of E-U(T) with pure silica data indicates a structural softening caused by the reduction of dynamical disorder, and suggests that the F-modified sol-gel synthesis is an appropriate route for achieving high energy shifts of the absorption edge. (C) 2007 American Institute of Physics.

Paleari, A., Meinardi, F., Lauria, A., Lorenzi, R., Chiodini, N., Brovelli, S. (2007). High-energy shift of the Urbach ultraviolet absorption from attenuated dynamical disorder in fluorine modified sol-gel silica. APPLIED PHYSICS LETTERS, 91(14) [10.1063/1.2794429].

High-energy shift of the Urbach ultraviolet absorption from attenuated dynamical disorder in fluorine modified sol-gel silica

PALEARI, ALBERTO MARIA FELICE
;
MEINARDI, FRANCESCO;LAURIA, ALESSANDRO;LORENZI, ROBERTO;CHIODINI, NORBERTO;BROVELLI, SERGIO
2007

Abstract

Fluorine modified amorphous silica has been synthetized via sol-gel route and studied through analysis of the temperature dependence of the Urbach absorption tail in the vacuum-ultraviolet region. The modified glass has a steep absorption edge above 8 eV, with the absorption coefficient alpha proportional to exp[E/E-U(T)] showing Urbach energy values E-U(T) ranging between 50 and 66 meV. The comparison of E-U(T) with pure silica data indicates a structural softening caused by the reduction of dynamical disorder, and suggests that the F-modified sol-gel synthesis is an appropriate route for achieving high energy shifts of the absorption edge. (C) 2007 American Institute of Physics.
Articolo in rivista - Articolo scientifico
fluorine, doping, silica, sol gel, 157 NM, glass, edge, spectra
English
2007
91
14
141913
reserved
Paleari, A., Meinardi, F., Lauria, A., Lorenzi, R., Chiodini, N., Brovelli, S. (2007). High-energy shift of the Urbach ultraviolet absorption from attenuated dynamical disorder in fluorine modified sol-gel silica. APPLIED PHYSICS LETTERS, 91(14) [10.1063/1.2794429].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/1315
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