The Effect of Exciton-Delocalizing Thiols on Intrinsic Dual Emitting Semiconductor Nanocrystals
Lakshay Jethi1, Timothy G Mack1, Michael M Krause1
1Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC, H3A0B8, Canada.
Abstract:
The emissive properties of thiol-capped CdSe nanocrystals (NCs) with intrinsic dual emission are investigated through temperature-dependent photoluminescence (PL) measurements. We demonstrate the influence of thiols on the relative PL intensities of the core and surface emissive states, as well as on the observed Stokes shifts. A redshift of both the core and surface PL in comparison with phosphonate-capped NCs is consistent with recent work exploring the effect of thiols as excitonic hole-delocalizing ligands. This observation is consistent with prior reports suggesting that surface excitons originate from electrons bound to cadmium trap states.
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