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Based on a model for size-dependent atomic cohesive energy of nanocrystals, a simple and unified model, without any adjustable parameter, has been established for finite size effect on shifts of valence and conduction band edges [DeltaEV(D) and DeltaEC(D)], and bandgap expansion [DeltaEG(D)| of semiconductor nanocrystals, where Delta denotes the expansion and D is the size of nanocrystals. In the...
We have studied the effect of photodarkening on photoluminescence dynamics in CdS nanocrystals in glass. We have found that the commonly observed increase in the decay rate during photodarkening is spectrally selective, being limited only to the photoluminescence spectral region generally related with carriers in nanocrystal interior states or in shallow traps. On the contrary, the photoluminescence...
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