Exciton trapping in the one-dimensional antiferromagnet [(CH3)4N]MnCl3

The dynamics of exciton motion in tetramethylammonium manganese (II) trichloride (TMMC) are investigated in the presence of copper (II) and cobalt (II) traps. Manganese luminescence decay curves are analyzed using several models and at various trap concentrations and temperatures, with the conclusion that trapping does not occur on every encounter. Trapping efficiencies are about 10−4. On-chain transport is found to be incoherent, with hop rates of approximately 1012 s−1 at 273 K and 1011 s−1 at 160 K. The Mn to trap rates and the rate of hopping between trap-limited chain segments are also estimated.