Decay of Fluorescence from Phonon-Assisted Optical Transition in CsMnCl3 .2D2O:Co(2+)

摘要

We report results of the 4T1 yielding 6A1 exciton dynamics of Mn(2+) in the quasi-one-dimensional antiferromagnet CsMnCl3(dot)2D2O:Co(2+) at 2 K. The experimental results are compared with the predictions of a theoretical model for Frenkel excitons in a one-dimensional system with substitutional traps. Good agreement is obtained for the case of exciton line pumping. For the case of a phonon sideband pump a model of exciton migration assisted by nonequilibrium phonons is proposed in order to compensate for the quantitative disagreement between the experimental results and the theoretical model for Frenkel excitons.