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Polarization-driven stark shifts in quantum dot luminescence from single CdSe/oligo-PPV nanoparticles.

Authors
  • Early, K T
  • Sudeep, P K
  • Emrick, T
  • Barnes, M D
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
May 12, 2010
Volume
10
Issue
5
Pages
1754–1758
Identifiers
DOI: 10.1021/nl1001789
PMID: 20392056
Source
Medline
License
Unknown

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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