The physical behavior of excitons in binary semiconducting alloys in strong- and weak-binding limits is discussed. It is pointed out that for weakly bound Wannier excitons, an effective-medium model is more appropriate. The effect of single-particle lifetimes in alloys on the exciton lifetime is discussed. It is suggested that for excitons in CuBrₓCl_1-x, such single-particle contributions to exciton lifetime are quite significant.
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S. D. Mahanti (1974) studied this question.
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