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Polarization-driven stark shifts in quantum dot luminescence from single CdSe/oligo-PPV nanoparticles
K T Early1, P K Sudeep, T Emrick
1Department of Chemistry and Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Amherst, Massachusetts 01003, USA.
Abstract:
We demonstrate polarization-induced spectral shifts and associated linearly polarized absorption and emission in single CdSe/oligo-(phenylene vinylene) (CdSe/OPV) nanoparticles. A mechanism for these observations is presented in which charge separation from photoexcited ligands results in a significant Stark distortion of the quantum dot electron/hole wavefunctions. This distortion results in an induced linear polarization and an associated red shift in band-edge photoluminescence. These studies suggest the use of single quantum dots as local charge mobility probes.
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