The structure of mixed fluorides Ca1?xSrxF2 and Sr1?xBaxF2 and the luminescence of Eu2+ in these crystals |
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Authors: | A E Nikiforov A Yu Zakharov V A Chernyshev M Yu Ugryumov and S V Kotomanov |
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Institution: | (1) Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia |
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Abstract: | The structure of the mixed fluorites Ca1−x
SrxF2 and Sr1−x
BaxF2, as well as the structure of the Eu2+ impurity center in these crystals, is calculated within the framework of the virtual-crystal method realized in the shell
model and pair-potential approximation. The phenomenological dependence of the position of the lower level of the 4f
65d configuration of the Eu2+ ion on distance to the Eu2+-ligand is derived. The dependences of the Stokes shift and the Huang-Rhys factor on x are calculated for the yellow luminescence in Sr1−x
BaxF2:Eu2+. The value of x at which the lower level of the 4f
65d configuration of the Eu2+ ion in Sr1−x
BaxF2:Eu2+ falls within the conduction band is found.
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Translated from Fizika Tverdogo Tela, Vol. 45, No. 5, 2003, pp. 823–826.
Original Russian Text Copyright ? 2003 by Nikiforov, Zakharov, Chernyshev, Ugryumov, Kotomanov. |
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