Abstract
In a rigid lattice the effect on the exciton band of a trap with a lower transition energy than the host is to push a level down from the band edge to an extent depending on the trap depth and the structure of the band. In a non-rigid lattice, in which the levels of the band have mixed exciton-phonon character, interferences caused by the phonon additions to the eigenstates belonging to the same total wavevector (exciton plus phonon) can, especially for shallow traps, greatly weaken the effect of the traps. The effective trap depth may be reduced to a small fraction of its true value. In such cases shallow traps will not be detectable by their influence on exciton band structure. The effect of deep traps is not changed by this mechanism.
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