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      Quantum efficiency enhancement in nanocrystals using nonradiative energy transfer with optimized donor-acceptor ratio for hybrid LEDs

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      Author
      Nizamoglu, S.
      Akin, O.
      Demir, Hilmi Volkan
      Date
      2009-06-17
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Publisher
      American Institute of Physics
      Volume
      94
      Issue
      24
      Pages
      243107-1 - 243107-3
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      The quantum efficiency enhancement in nanocrystal solids is critically important for their efficient use as luminophors on color-conversion light emitting diodes (LEDs). For this purpose, we investigate energy gradient mixture of nanocrystal solids for recycling their trapped excitons by varying their donor-acceptor nanocrystal ratios and study the resulting quantum efficiency enhancement as a function of the donor-acceptor ratio in the solid film for hybrid LEDs. We achieve a maximum quantum efficiency enhancement of 17% in these nanocrystal solids when the donor-acceptor ratio is 1:1, demonstrating their highly modified time-resolved photoluminescence decays to reveal the kinetics of strong energy transfer between them.
      Keywords
      Cadmium compounds
      Excitons
      Ii-vi semiconductors
      Light emitting diodes
      Nanostructured materials
      Phosphors
      Photoluminescence
      Time resolved spectra
      Wide band gap semiconductors
      Zinc compounds
      Permalink
      http://hdl.handle.net/11693/13465
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.3141516
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      • Nanotechnology Research Center (NANOTAM) 1006
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