Abstract
The luminescence properties of divalent ytterbium in alkaline earth fluorohalides are reported. In the Ca and Sr fluorohalides an emission is observed in the 400-nm region. The excitation spectrum of CaFBr: Yb 2+ is different from those of the others, which is ascribed to a different coordination of the metal ion in this compound. The luminescence of YbFBr is also studied. In this compound energy migration to Sm 2+ occurs. In BaFCl and BaFBr no Yb 2+ luminescence is observed. From thermoluminescence measurements it is concluded that the Ca and Sr compounds act as storage phosphors and that the storage and recombination mechanisms are similar to those of the Eu 2+-activated compositions.
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