Publication date: 10th April 2014
The luminescence of trivalent lanthanide ions (Ln3+) in the binary fluorides CaF2 and SrF2 has been thoroughly studied in the past, as these materials are considered to be interesting hosts for luminescent ions (especially Er3+, Tm3+, Yb3+) for laser applications. On the other hand, CaF2:Ln3+, Yb3+ (Ln=Er, Tm) fluorite nanoparticles have been investigated as efficient upconverters. In colloidal form they have been recently suggested as optical active ions for imaging in biology and medicine.
The local environment of lanthanide ions present as dopants in CaF2 or SrF2 in nanocrystalline form has not been exhaustively studied in the literature. This can be done by using the Eu3+ ion as a spectral probe. The literature about the luminescence of Eu3+ in nanoparticles of CaF2 or SrF2 is not very rich, and, to the best of our knowledge, no study of the optical spectroscopy under high resolution conditions has been carried out for these nanoparticles doped with trivalent europium. For this reason we found it interesting to carry out a detailed study on isolated nanocrystals of CaF2 and SrF2 doped with Eu3+, with the ultimate goal of obtaining information on the local structure around the lanthanide ion in fluorite type nanoparticles.The results of this investigation are presented and discussed for fluorite nanoparticles with different capping agents.
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