Pure and doped antiferromagnetic CsMnCl3.2H2O (CMC) crystals have been
studied in the temperature range 4.2-300 K. With an increase in tempe
rature the luminescence time and intensity of doped CMC crystals (1% a
nd 0.1% Cu2+) decrease. The exciton-emission quenching is associated w
ith exciton migration and trapping. The emission decay kinetics is app
roximated by the calculated curves obtained using the Kenkre and Onipk
o, Malysheva, and Zozulenko theories. The exciton hopping (W) and trap
ping (U) rates have been defined. Exciton trapping by the Cu2+ traps i
n CMC is inefficient. The dependences W(T) and U(T) are given for two
dopant concentrations in CMC obtained in the temperature range 77-237
K.