Research Article


2018, 11(7): 3593–3602


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

Fu Feng1, Loan Thu Nguyen1,2, Michel Nasilowski3, Brice Nadal3, Benot Dubertret3, Laurent Coolen1, and Agnès Matre1 (*)

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1 Sorbonne Universités, UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France
2 Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay Dist., 100000 Hanoi,Vietnam
3 Laboratoire de Physique et d’Etude des Matériaux, ESPCI, UPMC Univ Paris 6, CNRS, 10 rue Vauquelin, F-75005 Paris, France

Keywords: colloidal semiconductor nanoplatelet, emission dipole, emission polarization, emission pattern
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ABSTRACT 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.
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Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets. Nano Res. 2018, 11(7): 3593–3602

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