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Different Eu-centres in CaS:Eu, Cl |
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| Authors: | M. Danilkin, M. Must, E. Pedak, E. P rnoja, G. Ryasnyi, V. Seeman, I. Shpinkov,L. Shpinkova |
| Affiliation: | a Institute of Chemical Physics, Institute of Experimental Physics and Technology, Tartu University, EE2400, Tartu, Estonia * Synchrotron Radiation Laboratory, Nuclear Physics Research Institute, Moscow University, 117234, Moscow, Russia |
| Abstract: | The EPR and luminescence properties of CaS:Eu,Cl-luminophors with different Cl and Eu concentrations are studied. The Mössbauer effect on 151Eu is measured. Eu as a dopant is shown to form mainly Eu3+-centres rather than Eu2+-centres. Eu oxidation to Eu3+ is due to the formation of VCaClS-associates in the CaS lattice. Besides the Eu2+-centres of high symmetry various Eu2+-Eu2+ pairs are formed and are responsible for a broad structureless EPR spectrum and for an infrared shift of the Eu2+ luminescence band. |
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