Site-selective Time-resolved Laser Fluorescence Spectroscopy of Eu3+ in Calcite
- MARQUES FERNANDES M.
- SCHMIDT M.
- STUMPF Th.
- WALTHER C.
- BOSBACH D.
- KLENZE R.
- FANGHAENEL THOMAS
DOIAbstract
Three samples of calcite homogeneously doped with Eu3+ were synthesized in a mixed-flow reactor. By means of selective excitation of the 5D0 ¿ 7F0 transition at low temperatures (T <20 K), three different Eu3+ species (species A, B, and C, respectively) could be discriminated. For each one, the emission spectrum and lifetime were obtained after selective excitation of the single species. On the basis of these data, species C could be identified as Eu3+ incorporated into the calcite lattice on the (nearly) octahedral Ca2+ site. Species B was also identified as Eu3+ incorporated into the calcite lattice, but the ligand field shows a much weaker symmetry. Species A, however, is not incorporated into the crystal¿s bulk, having 1¿2 H2O ligands l...
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