VUV spectroscopy of pure and Tm-doped LicaAlF6 crystals |
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Authors: | M. True Y. Chen S. Vielhauer |
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Affiliation: | a Institute of Experimental Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany b Department of Physics, University of Science and Technology of China, 230026 Hefei, China c Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia |
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Abstract: | Nominally pure and Tm3+-doped LiCaAlF6 crystals were grown by the Czochralski technique in a reducing atmosphere. The optical properties of transparent single crystals were studied using absorption and time-resolved luminescence spectroscopy in the VUV spectral range (330-100 nm). The strongest VUV emission peaking at 60 800 cm−1 with a decay time of 5.6 μs (7 μs) at 300 K (7.4 K) was assigned to the spin-forbidden 4f115d-4f12 transition of Tm3+. The fine structure observed in the VUV emission and corresponding excitation spectra indicate intermediate strength of electron-phonon coupling in this system. The efficient excitation of f-f emissions above 72 000 cm−1, higher than the onset of f-d absorption at 63 000 cm−1, is mainly caused by the F− to Tm3+ charge transfer absorption. The nature of various host-related excitation processes in the energy transfer to the Tm3+ ions is discussed. |
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Keywords: | LiCaAlF6 Tm3+ ion d-f emission Intrinsic excitations Charge transfer absorption Synchrotron radiation |
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