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Issue 19, 2014
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Study of exciton transfer in dense quantum dot nanocomposites

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Nanocomposites of colloidal quantum dots (QDs) integrated into conjugated polymers (CPs) are key to hybrid optoelectronics, where engineering the excitonic interactions at the nanoscale is crucial. For such excitonic operation, it was believed that exciton diffusion is essential to realize nonradiative energy transfer from CPs to QDs. In this study, contrary to the previous literature, efficient exciton transfer is demonstrated in the nanocomposites of dense QDs, where exciton transfer can be as efficient as 80% without requiring the assistance of exciton diffusion. This is enabled by uniform dispersion of QDs at high density (up to ∼70 wt%) in the nanocomposite while avoiding phase segregation. Theoretical modeling supports the experimental observation of weakly temperature dependent nonradiative energy transfer dynamics. This new finding provides the ability to design hybrid light-emitting diodes that show an order of magnitude enhanced external quantum efficiencies.

Graphical abstract: Study of exciton transfer in dense quantum dot nanocomposites

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The article was received on 20 Jun 2014, accepted on 22 Jul 2014 and first published on 25 Jul 2014

Article type: Paper
DOI: 10.1039/C4NR03456B
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2014,6, 11387-11394
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    Study of exciton transfer in dense quantum dot nanocomposites

    B. Guzelturk, P. L. Hernandez-Martinez, V. K. Sharma, Y. Coskun, V. Ibrahimova, D. Tuncel, A. O. Govorov, X. W. Sun, Q. Xiong and H. V. Demir, Nanoscale, 2014, 6, 11387
    DOI: 10.1039/C4NR03456B

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