Gd-incorporation and luminescence properties in sol-gel silica glasses |
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Authors: | Daniela Di Martino Norberto Chiodini Federico Moretti Andrea Baraldi Rosanna Capelletti Martin Nikl Giuliano Angella |
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Institution: | a Dipartimento di Scienza dei Materiali and CNISM, Università di Milano-Bicocca, Via Cozzi 53, 20125 Milano, Italy b Dipartimento di Fisica and CNISM, Università di Parma, Viale G.P. Usberti 7/A, Campus Universitario, 43100 Parma, Italy c Institute of Physics AS CR, Cukrovarnicka 10, 162 53 Prague, Czech Republic d CNR, Istituto IENI, Sez. Milano Bicocca, INFM-CNR UdR Milano Bicocca, Italy e Dipartimento di Fisica ‘A. Volta’, Università di Pavia and CNISM, 27100 Pavia, Italy |
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Abstract: | A thorough study was performed on Gd-doped sol-gel silica glasses, in the concentration range 0-8 mol% Gd. The analyses were carried out as a function of Gd content, before and after a post-densification thermal treatment. Different results concerning optical, vibrational, magnetic, and structural features were gathered in correlated experiments. The presence of Gd-rich nanoclusters was revealed. The size of nanoclusters increases by increasing the dopant concentration and by performing a rapid thermal treatment (RTT) at 1800 °C in air, which causes also a remarkable intensity increase of the 6P7/2 → 8S7/2 radioluminescence transition of Gd3+. Nanoclusters are amorphous, possibly close to a Gd2SiO5 stoichiometry as suggested by fast Fourier transform infrared spectroscopy (FTIR). FTIR studies revealed also the presence of Gd-dimers interacting with OH− groups. Moreover, the presence of isolated Gd3+ ions was detected by electron paramagnetic resonance investigations. Based on the results obtained with different techniques, the Gd-incorporation in silica glass host and the resulting optical properties are discussed. |
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Keywords: | 81 05 Kf 78 60 61 80 &minus x 78 67 Bf |
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