The optical emission from the 5d - 4f allowed transition of Pr3+ ions embedded in sol-gel silica is investigated for High Energy Physics applications requiring fast scintillating materials. A complete and detailed characterization of the optical, scintillation and radiation hardness properties of Pr-doped silica is carried out employing different experimental techniques including steady-state and time-resolved photo-luminescence, radio- and thermo-luminescence, scintillation and optical absorption. Optical absorption measurements, performed after X-ray irradiation sequences up to 1 kGy, evidence the formation of radiation-induced absorption bands related to point defects acting as color centers. Spontaneous partial recovery of the radiation-induced defects at room temperature, as well as after thermal treatments, is also disclosed. Particular attention is paid to the comparison between bulk silica, both before and after a melting process, and fibers. The results reveal the presence of a lower concentration of optically active defects in melted glass. Such comparison highlights a role of the fiber drawing in modifying the glass defectiveness, consisting in the occurrence of a structural reorganization of the amorphous network during the process

Cova, F., Fasoli, M., Moretti, F., Chiodini, N., Pauwels, K., Auffray, E., et al. (2017). Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process. JOURNAL OF LUMINESCENCE, 192, 661-667 [10.1016/j.jlumin.2017.07.045].

Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process

COVA, FRANCESCA
Primo
;
FASOLI, MAURO
;
MORETTI, FEDERICO;CHIODINI, NORBERTO;PAUWELS, KRISTOF;Lucchini, M;VEDDA, ANNA GRAZIELLA
Ultimo
2017

Abstract

The optical emission from the 5d - 4f allowed transition of Pr3+ ions embedded in sol-gel silica is investigated for High Energy Physics applications requiring fast scintillating materials. A complete and detailed characterization of the optical, scintillation and radiation hardness properties of Pr-doped silica is carried out employing different experimental techniques including steady-state and time-resolved photo-luminescence, radio- and thermo-luminescence, scintillation and optical absorption. Optical absorption measurements, performed after X-ray irradiation sequences up to 1 kGy, evidence the formation of radiation-induced absorption bands related to point defects acting as color centers. Spontaneous partial recovery of the radiation-induced defects at room temperature, as well as after thermal treatments, is also disclosed. Particular attention is paid to the comparison between bulk silica, both before and after a melting process, and fibers. The results reveal the presence of a lower concentration of optically active defects in melted glass. Such comparison highlights a role of the fiber drawing in modifying the glass defectiveness, consisting in the occurrence of a structural reorganization of the amorphous network during the process
Articolo in rivista - Articolo scientifico
Radiation damage; Rare-earths; Scintillating fibers; Sol-gel; Biophysics; Atomic and Molecular Physics, and Optics; Condensed Matter Physics
English
2017
192
661
667
open
Cova, F., Fasoli, M., Moretti, F., Chiodini, N., Pauwels, K., Auffray, E., et al. (2017). Optical properties and radiation hardness of Pr-doped sol-gel silica: Influence of fiber drawing process. JOURNAL OF LUMINESCENCE, 192, 661-667 [10.1016/j.jlumin.2017.07.045].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/168018
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