Effect of compositional disorder on the optical properties of Cd1-xZnxTe

Time-resolved as well as time-integrated luminescence of a bulk grown undop ed Cd0.12Zn0.88Te crystal is measured to investigate the effect of composit ional disorder on the recombination dynamics. The temporal behavior of the neutral-donor-bound exciton emission is well expressed by a simple exponent ial rise and decay. However, non-exponential rise and decay are observed fo r the acceptor-bound-exciton emission. It is shown that by introducing an i ntermediate state for the transition, the temporal behavior, especially the rising edge, of the acceptor bound exciton emission can well be described by a rate equation model.