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. 2016 Mar 3;17(5):665-9.
doi: 10.1002/cphc.201501049. Epub 2016 Jan 15.

The Effect of Exciton-Delocalizing Thiols on Intrinsic Dual Emitting Semiconductor Nanocrystals

Lakshay Jethi  1 , Timothy G Mack  1 , Michael M Krause  1 , Sebastian Drake  1 , Patanjali Kambhampati  2
Affiliations

The Effect of Exciton-Delocalizing Thiols on Intrinsic Dual Emitting Semiconductor Nanocrystals

Lakshay Jethi et al. Chemphyschem. .

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.

Keywords: ligands; nanocrystals; quantum dots; semiconductors; thiols.

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