Radiative transitions on the low-energy side of the exciton---neutral-acceptor transitions are reported in good-quality epitaxially grown samples of GaAs and InP at liquid-helium temperature. These lines result from transitions within a complex involving two shallow neutral acceptors and a single neutral donor. The initial state of the system consists of two neutral acceptors each with an exciton bound to it, and a neutral donor. The exciton collapses on one of the acceptors, giving part of its radiative energy to the second acceptor-exciton system to transfer the exciton to the neutral donor. The final state, therefore, consists of two neutral acceptors and a neutral-donor-bound-exciton system. The transition energies predicted on the basis of this model agree very well with the observed energies in both GaAs and InP.
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Reynolds et al. (1983) studied this question.
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