Quasi-one-dimensional excitons in the antiferromagnet CsMnCI3 · 2H2O

The temperature dependence of the relative quantum yield and of luminescence decay kinetics of pure and doped CsMnCl3 · 2H2O (CMC) is studied in the interval 6–300 K. As the temperature increases beyond 60 K, a strong quenching of the exciton glow is observed in the doped crystal (with 0.1% Cu2+). Above 60 K, the decay kinetics of doped crystals has a complicated form typical of quasi–one–dimensinal excitons. These results are due to a migration of excitons which were earlier assumed to be localized in this crystal. The kinetics of quenching of the exciton glow in impurity CMC is approximated by theoretical curves obtained in Onipko’s approximation. This leads to the probability (ω = 1.8 · 107 s−1) of exciton jump to a trap at 218 K.

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