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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Ferrari, M., Piazza, A., Montagna, M. et al. Site selection spectroscopy of SiO2:Eu3+ gels. J Sol-Gel Sci Technol 2, 783–786 (1994). https://doi.org/10.1007/BF00486350
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DOI: https://doi.org/10.1007/BF00486350