Excitation and emission spectra of CaF₂:Sr single crystals with various strontium concentrations have been investigated by the method of luminescence spectroscopy. A new emission band peaking at 4.1 eV has been found and attributed to the radiative decay of excitons trapped near the Sr²⁺ impurity ions. The same spectral composition has the emission band arising from the recombination of conduction-band electrons with holes localised near Sr²⁺ ions (V_KA(Sr²⁺) centres). A mechanism of exciton and hole trapping by homologous cation impurities of large ionic radii is suggested. It is concluded, that the doping of CaF₂ by strontium leads to the increase in radiation stability of this optical material.

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Volume191, Issue2

June 2002

Pages 628-632

Impurity-Related Excitonic Processes in CaF₂ : Sr

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Impurity-Related Excitonic Processes in CaF₂ : Sr