Optical spectra of Eu3+ ion pairs in Y2O3 |
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Authors: | U. Köbler |
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Affiliation: | 1. Institut für Technische Physik, Technische Hochschule, Darmstadt
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Abstract: | All the optical transitions of Eu3+ ions substituted on Y3+ lattice sites of point symmetryC 2 orC 3i in Y2O3 show weak extra lines (satellites) extending over a range of few wavenumbers on both sides of the main line. It is proved by a study of the concentration dependence of the intensities of these satellites that they arise from pairs of two identical Eu3+ ions, interacting with each other when their separation is less then ~9 Å. By means of absorption and fluorescence excitation spectra of the transitions of Eu3+ at lattice sites of point symmetryC 3i , first, second and third nearestC 3i -C 3i neighbour pairs could be identified. The mean pair interaction is of the order of 5 cm?1 and is assumed to be due to superexchange via the oxygen ions. |
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