The lifetime of indirect excitons in AgBr quantum dots was studied at low temperature. Indirect-exciton luminescence shows a nonexponential decay. The unique nonexponential decay is well explained by a model that takes into account the discrete number of iodine impurities in a AgBr quantum dot. The obtained radiative lifetime of indirect excitons is 735±{}50 {μ}s at 2 K and is independent of the radius of microscrystals. The result clearly shows that the L-{Γ} mixing effect for holes does not work when the radius is larger than 3.5 nm.
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Masumoto et al. (1992) studied this question.
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