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Abstract
In CsCdBr 3 the trivalent rare-earth (RE) ions substitute the divalent Cd ions. For reasons of charge compensation and the quasilinear structure of the lattice, only two types of ion pairs are found predominantly, the weakly coupled symmetric pair RE 3+-Cd vacancy-RE 3+ and the strongly coupled asymmetric pair RE 3+-RE 3+-Cd vacancy. Only the latter one showed up-conversion, which was studied for a Tm 3+ crystal doped with small impurities of Ho 3+. The results are compared with those for Pr 3+. The results show that the fluorescence dynamics cannot be described by ion-ion cross relaxation but need the inclusion of electronic host lattice excitations.
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