Electronic excitations and luminescence of SrAlF5 crystals doped with Ce3+ ions |
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Authors: | S. Omelkov V. Pustovarov M. Kirm I. Ogorodnikov L. Isaenko |
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Affiliation: | 1. Ural State Technical University, Mira st. 19, 620002 Yekaterinburg, Russia;2. Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia;3. Institute of Geology and Minerology SB RAS, Russkaya st. 43, Novosibirsk 58, 630058 Russian Federation |
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Abstract: | This paper reports the results of a time-resolved photoluminescence and energy transfer processes study in Ce3+ doped SrAlF5 single crystals. Several Ce3+ centers emitting near 4 eV due to 5d-4f transitions of Ce3+ ions substituting for Sr2+ in non-equivalent lattice sites were identified. The lifetime of these transitions is in the range of 25–35 ns under intra-center excitation in the energy region of 4–7 eV at T = 10 K. An effective energy transfer from lattice defects to dopant ions was revealed in the – 7–11 eV energy range. Both direct and indirect excitation channels are efficient at room temperature. Excitons bound to dopants are revealed at T = 10 K under excitation in the fundamental absorption region above 11 eV, as well as radiative decay of self-trapped excitons resulting in luminescence near 3 eV. |
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