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Rare-Earth Doped Sol-Gel Silicate Glasses for Scintillator Applications

2003; Taylor & Francis; Volume: 158; Issue: 1-6 Linguagem: Inglês

10.1080/1042015021000053169

1042-0150

N. Chiodini, Mauro Fasoli, M. Martini, Franca Morazzoni, E. Rosetta, Roberto Scotti, G. Spinolo, A. Vedda, M. Nikl, N. Solovieva, A. Baraldi, R. Capelletti, R. Francini,

Radiation Detection and Scintillator Technologies

Radio-, photo- and thermally stimulated—luminescence (RL, PL, TSL) measurements have been performed on SiO2 sol-gel glasses doped by 0.1 mol% Ce and 3 mol% Gd, and on (0.1 mol% Ce, 3 mol% Gd) co-doped samples. Ce3☎ 5d-4f emission peaking at about 2.7 eV has been observed in the RL of SiO2: 0.1 mol% Ce, while the typical 6P-8S emission of Gd3☎ centred at 3.97 eV has been detected in SiO2: 3 mol% Gd. The co-doped sample displays both 5d-4f Ce3☎ and 6P-8S Gd3☎ emissions with reduced intensities with respect to those observed in the singly doped glasses. Moreover, in co-doped glasses the PL time decay patterns of both rare earth ions show a non exponential dependence and are significantly shortened. To explain such an effect non radiative de-excitation of both RE ions excited states involving energy transfers to defect levels is suggested. Bidirectional Gd3☎ ↔ Ce3☎ energy transfers could also occur. Complementary TSL measurements put in evidence the existence of broad glow peaks at about 100 K and 220 K. The TSL spectra feature the RE ions emissions.