Polarization-driven stark shifts in quantum dot luminescence from single CdSe/oligo-PPV nanoparticles.
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.
Early
K T
KT
Department of Chemistry and Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Amherst, Massachusetts 01003, USA.
Sudeep
P K
PK
Emrick
T
T
Barnes
M D
MD
D019187:Cadmium Compounds / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D008163:Luminescent Measurements / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D045663:Quantum Dots; D012031:Refractometry / Q000379:methods*; D018036:Selenium Compounds / Q000737:chemistry*; D013499:Surface Properties
D019187:Cadmium Compounds; D046911:Macromolecular Substances; D018036:Selenium Compounds; C058667:cadmium selenide