Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

In this paper, we demonstrate that for colloidal CdSe/CdS nanoplatelets, a rectangular shape induces emission asymmetry, in terms of both polarization and emission patterns. Polarimetry and emission pattern analyses are combined to provide information on the orientation of the transition dipoles inv...

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Bibliographic Details
Published in:Nano research 2018-07, Vol.11 (7), p.3593-3602
Main Authors: Feng, Fu, Nguyen, Loan Thu, Nasilowski, Michel, Nadal, Brice, Dubertret, Benoît, Coolen, Laurent, Maître, Agnès
Format: Article
Language:English
Subjects:
Anisotropy
Asymmetry
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Cadmium selenides
Cadmium sulfide
Chemistry and Materials Science
Condensed Matter
Condensed Matter Physics
Elongation
Emission analysis
Emissions
Materials Science
Nanotechnology
Physics
Polarimetry
Quantum dots
Radiation
Research Article
Symmetry
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Description
Summary:In this paper, we demonstrate that for colloidal CdSe/CdS nanoplatelets, a rectangular shape induces emission asymmetry, in terms of both polarization and emission patterns. Polarimetry and emission pattern analyses are combined to provide information on the orientation of the transition dipoles involved in the nanoplatelet emission. It is shown that for rectangular nanoplatelets, the emission is polarized and the emission patterns are anisotropic, whereas they remain nonpolarized and isotropic for square nanoplatelets. This can be appropriately described by the dielectric antenna effect induced by the elongated shape of the rectangular platelet.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-017-1926-3