Nonradiative energy transfer in colloidal CdSe nanoplatelet films

Date
2015
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Source Title
Nanoscale
Print ISSN
2040-3364
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Publisher
Royal Society of Chemistry
Volume
7
Issue
6
Pages
2545 - 2551
Language
English
Type
Article
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Abstract

Nonradiative energy transfer (NRET) has been extensively studied in colloidal nanocrystal (quantum dots) and nanorod (quantum wires) assemblies. In this work, we present the first account of spectroscopic evidence of NRET in solid thin films of CdSe based colloidal nanoplatelets (NPLs), also known as colloidal quantum wells. The NRET was investigated as a function of the concentration of two NPL populations with different vertical thicknesses via steady state and time resolved spectroscopy. NRET takes place from the NPLs with smaller vertical thickness (i.e., larger band gap) to the ones with a larger vertical thickness (i.e., smaller band gap) with efficiency up to ∼60%. Here, we reveal that the NRET efficiency is limited in these NPL solid film assemblies due to the self-stacking of NPLs within their own population causing an increased distance between the donor-acceptor pairs, which is significantly different to previously studied colloidal quantum dot based architectures for nonradiative energy transfer. © The Royal Society of Chemistry 2015.

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Keywords
Energy gap, Energy transfer, Laser spectroscopy, Nanocrystals, Nanorods, Semiconductor quantum wires, Colloidal nanocrystals, Colloidal quantum dots, Colloidal quantum wells, Donor - acceptor pairs, Nonradiative energy transfer, Solid thin films, Spectroscopic evidence, Time - reresolved spectroscopy, Semiconductor quantum dots
Citation
Published Version (Please cite this version)