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      Study of exciton transfer in dense quantum dot nanocomposites

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      Author(s)
      Guzelturk, B.
      Hernandez-Martinez, P. L.
      Sharma, V. K.
      Coskun, Y.
      Ibrahimova, V.
      Tuncel, D.
      Govorov, A. O.
      Sun, X. W.
      Xiong, Q.
      Demir, Hilmi Volkan
      Date
      2014
      Source Title
      Nanoscale
      Print ISSN
      2040-3364
      Electronic ISSN
      2040-3372
      Publisher
      Royal Society of Chemistry
      Volume
      6
      Issue
      19
      Pages
      11387 - 11394
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      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.
      Keywords
      Exciton transfer
      Permalink
      http://hdl.handle.net/11693/26640
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/c4nr03456b
      Collections
      • Department of Chemistry 677
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2484
      • Institute of Materials Science and Nanotechnology (UNAM) 2098
      • Nanotechnology Research Center (NANOTAM) 1125
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