Abstract
Luminescence spectra and decay time measurements of the 4s2 ion As3+ in CS2NaScCl6 are presented. A dynamical Jahn-Teller effect is observed in the excitation spectrum of the As3+ ion. The luminescence properties of Cs2NaScCl6-As3+ are comparable to those of Cs2NaScCl6-Sb3+ taking into account the differences in ionic radius and spin-orbit
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