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      • Department of Electrical and Electronics Engineering
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      Colloidal quantum dot light-emitting diodes employing phosphorescent small organic molecules as efficient exciton harvesters

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      Author(s)
      Mutlugun, E.
      Guzelturk, B.
      Abiyasa, A. P.
      Gao, Y.
      Sun X. W.
      Demir, Hilmi Volkan
      Date
      2014
      Source Title
      Journal of Physical Chemistry Letters
      Print ISSN
      1948-7185
      Electronic ISSN
      1948-7185
      Publisher
      American Chemical Society
      Volume
      5
      Issue
      16
      Pages
      2802 - 2807
      Language
      English
      Type
      Article
      Item Usage Stats
      521
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      316
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      Abstract
      Nonradiative energy transfer (NRET) is an alternative excitation mechanism in colloidal quantum dot (QD) based electroluminescent devices (QLEDs). Here, we develop hybrid highly spectrally pure QLEDs that facilitate energy transfer pumping via NRET from a phosphorescent small organic molecule-codoped charge transport layer to the adjacent QDs. A partially codoped exciton funnelling electron transport layer is proposed and optimized for enhanced QLED performance while exhibiting very high color purity of 99%. These energy transfer pumped hybrid QLEDs demonstrate a 6-fold enhancement factor in the external quantum efficiency over the conventional QLED structure, in which energy transfer pumping is intrinsically weak.
      Keywords
      Electroluminescence
      Excitons
      Light emission
      Light emitting diodes
      Molecules
      Optoelectronic devices
      Phosphorescence
      Semiconductor quantum dots
      Colloidal quantum dots
      Hybrid light-emitting diodes
      Nonradiative energy transfer
      Phosphorescent molecules
      Triplet state
      Energy transfer
      Permalink
      http://hdl.handle.net/11693/25469
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jz5012669
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
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