Abstract
We have studied the relaxed state of excitons in PbBr 2 and PbCl 2 crystals from the photoluminescence (PL) properties at low temperatures. The analysis of decay curves of intrinsic PL band reveals that excitons relax into charge-separated pairs of a self-trapped electron and a self-trapped hole in both crystals. The relaxation of excitons, found experimentally for the first time, is ascribed to the repulsive correlation via acoustic phonons between the electron and hole.
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