Site selection spectroscopy of SiO2:Eu3+ gels |
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| Authors: | M Ferrari A Piazza M Montagna G Carturan R Campostrini |
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| Institution: | (1) Centro C.N.R. di Fisica degli Stati Aggregati, 38050 Povo (TN), Italy;(2) Dipartimento di Fisica, Università di Trieste, Via A. Valerio 2, 34127 Trieste, Italy;(3) Dipartimento di Ingegneria dei Materiali, Università di Trento, 38050 Mesiano (TN), Italy |
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| Abstract: | Silica gels doped with Eu3+ ions were studied at temperatures between 10 K and 300 K by site selection spectroscopy in samples heated up to 200°C. The 5D0  7F0 transition shows internal structures due to the different environments of the europium ions. Lifetimes, energy levels and homogeneous linewidths are site dependent. In the wet gel the Eu3+ ions prefer a liquid-like environment and only when the liquid is removed by heat treatment, the ion is linked more strongly to the silica network. |
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| Keywords: | optical spectroscopy fluorescence line narrowing Eu3+ silica xerogel |
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