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      Macrocrystals of colloidal quantum dots in anthrancene: exciton trannsfer and polarized emission

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      Author
      Soran-Erdem, Z.
      Erdem, T.
      Hernandez-Martinez, P. L.
      Akgül, M. Z.
      Gaponik N.
      Demir, Hilmi Volkan
      Date
      2015
      Source Title
      Journal of Physical Chemistry Letters
      Print ISSN
      1948-7185
      Publisher
      American Chemical Society
      Volume
      6
      Issue
      9
      Pages
      1767 - 1772
      Language
      English
      Type
      Article
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      Abstract
      In this work, centimeter-scale macrocrystals of nonpolar colloidal quantum dots (QDs) incorporated into anthracene were grown for the first time. The exciton transfer from the anthracene host to acceptor QDs was systematically investigated, and anisotropic emission from the isotropic QDs in the anthracene macrocrystals was discovered. Results showed a decreasing photoluminescence lifetime of the donor anthracene, indicating a strengthening energy transfer with increasing QD concentration in the macrocrystals. With the anisotropy study, QDs inside the anthracene host acquired a polarization ratio of similar to 1.5 at 0 degrees collection angle, and this increases to similar to 2.5 at the collection angle of 60 degrees. A proof-of-concept application of these excitonic macrocrystals as tunable color converters on light-emitting diodes was also demonstrated.
      Keywords
      Light - emitting - diodes
      Resonance Energy - transfer
      Single - crystals
      Organic - molecules
      Derivatives
      Nanocrystals
      Harvesters
      Displays
      Permalink
      http://hdl.handle.net/11693/12861
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/acs.jpclett.5b00685
      Collections
      • Department of Electrical and Electronics Engineering 3597
      • Department of Physics 2329
      • Institute of Materials Science and Nanotechnology (UNAM) 1831
      • Nanotechnology Research Center (NANOTAM) 1026
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