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      Morphology-dependent energy transfer of polyfluorene nanoparticles decorating InGaN/GaN quantum-well nanopillars

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      Author
      Erdem, T.
      Ibrahimova, V.
      Jeon, D. W.
      Lee, I. H.
      Tuncel, D.
      Demir, Hilmi Volkan
      Date
      2013
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Publisher
      American Chemical Society
      Volume
      117
      Issue
      36
      Pages
      18613 - 18619
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Conjugated polymer nanoparticles (CPNs), prepared in aqueous dispersion from poly[(9,9-bis{3- bromopropyl}fluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1,3}-thiodiazole)] (PFBT-Br), are incorporated into a nanopillar architecture of InGaN/GaN multiple quantum wells (MQWs) to demonstrate a new organic/inorganic class of nanostructured excitonic model system. This hybrid system enables intimate integration for strong exciton−exciton interactions through nonradiative energy transfer (NRET) between the integrated CPNs and MQW pillars. The NRET of these excitonic systems is systematically investigated at varied temperatures. In these hybrids, InGaN/GaN MQWs serve as the donor of the NRET pair, while immobilized PFBT-Br polymer serves as the acceptor. To understand morphology-dependent NRET, PFBT-Br CPNs coating InGaN/GaN MQWs are made to defold into polymer chains by in situ treatment with a good solvent (THF). The experimental results indicate that NRET is significantly stronger in the case of CPNs compared with their defolded polymer chains. At room temperature, while the NRET efficiency of open polymer chains−nanopillar system is only 10%, PFBT-Br CPNs exhibit a substantially higher NRET efficiency of 33% (preserving the total number of polymer molecules). The NRET efficiency of the nanoparticle systems is observed to be 25% at 250 K, 22% at 200 K, 19% at 150 K, and 15% at 100 K. On the other hand, the defolded polymer chains exhibit significantly lower NRET efficiencies of 17% at 250 K, 16% at 200 K, 11% at 150 K, and 5% at 100 K. This work may potentially open up new opportunities for the hybrid organic/inorganic systems where strong excitonic interactions are desired for light generation, light harvesting, and sensing applications.
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      http://hdl.handle.net/11693/11853
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jp404354s
      Collections
      • Department of Chemistry 631
      • Department of Electrical and Electronics Engineering 3613
      • Department of Physics 2345
      • Institute of Materials Science and Nanotechnology (UNAM) 1858
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