Is it reasonable to state that Stokes shift for core-shell nanostructures (e.g. CdSe/CdS) is smaller in comparison to bare core (e.g. CdSe)? If so, why this phenomenon occurs? Thanks in advance for your help!
Not necessarily.
I think the stoke shift in addition to many factors, will alsoo depend on particle size distribution. I guess narrow distribution is likely to give smaller shift and wide distribution may result into large shift.
Check literature for more authentic understanding.
If the absorption/emission is due to the crystal itself, rather than surface states, then the Stokes shift is due to electron lattice coupling and lattice relaxation in the excited state. It is conceivable that this lattice relaxation is constrained in Core/shell structures, compared to core structures of the same core dimensions.
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