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  4. Orientation-Controlled Nonradiative Energy Transfer to Colloidal Nanoplatelets: Engineering Dipole Orientation Factor
 
research article

Orientation-Controlled Nonradiative Energy Transfer to Colloidal Nanoplatelets: Engineering Dipole Orientation Factor

Erdem, Onur
•
Gungor, Kivanc
•
Guzelturk, Burak
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July 1, 2019
Nano Letters

We proposed and showed strongly orientation-controlled Forster resonance energy transfer (FRET) to highly anisotropic CdSe nanoplatelets (NPLs). For this purpose, we developed a liquidair interface self-assembly technique specific to depositing a complete monolayer of NPLs only in a single desired orientation, either fully stacked (edge-up) or fully nonstacked (face-down), with near-unity surface coverage and across large areas over 20 cm(2). These NPL monolayers were employed as acceptors in an energy transfer working model system to pair with CdZnS/ZnS core/shell quantum dots (QDs) as donors. We found the resulting energy transfer from the QDs to be significantly accelerated (by up to 50%) to the edge-up NPL monolayer compared to the face-down one. We revealed that this acceleration of FRET is accounted for by the enhancement of the dipoledipole interaction factor between a QD-NPL pair (increased from 1/3 to 5/6) as well as the closer packing of NPLs with stacking. Also systematically studying the distance-dependence of FRET between QDs and NPL monolayers via varying their separation (d) with a dielectric spacer, we found out that the FRET rate scales with d(-4) regardless of the specific NPL orientation. Our FRET model, which is based on the original Forster theory, computes the FRET efficiencies in excellent agreement with our experimental results and explains well the enhancement of FRET to NPLs with stacking. These findings indicate that the geometrical orientation of NPLs and thereby their dipole interaction strength can be exploited as an additional degree of freedom to control and tune the energy transfer rate.

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Type
research article
DOI
10.1021/acs.nanolett.9b00681
Web of Science ID

WOS:000475533900011

Author(s)
Erdem, Onur
Gungor, Kivanc
Guzelturk, Burak
Tanriover, Ibrahim
Sak, Mustafa
Olutas, Murat
Dede, Didem  
Kelestemur, Yusuf
Demir, Hilmi Volkan
Date Issued

2019-07-01

Published in
Nano Letters
Volume

19

Issue

7

Start page

4297

End page

4305

Subjects

Chemistry, Multidisciplinary

•

Chemistry, Physical

•

Nanoscience & Nanotechnology

•

Materials Science, Multidisciplinary

•

Physics, Applied

•

Physics, Condensed Matter

•

Chemistry

•

Science & Technology - Other Topics

•

Materials Science

•

Physics

•

semiconductor nanocrystals

•

nanoplatelets

•

liquid-air interface self-assembly

•

stacking

•

energy transfer

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dipole orientation

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quantum-dot

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spontaneous emission

•

efficient

•

nanocrystals

•

superlattices

•

nanoemitters

•

single

•

donors

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
IMX  
Available on Infoscience
August 1, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/159497
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