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      An efficient non-Lambertian organic light-emitting diode using imprinted submicron-size zinc oxide pillar arrays

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      Author
      Liu, S. W.
      Wang, J. X.
      Divayana, Y.
      Dev, K.
      Tan S.T.
      Demir, Hilmi Volkan
      Sun, X. W.
      Date
      2013
      Source Title
      Applied Physics Letters
      Print ISSN
      0003-6951
      Publisher
      AIP
      Volume
      102
      Issue
      5
      Language
      English
      Type
      Article
      Item Usage Stats
      390
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      123
      downloads
      Abstract
      We report phosphorescent organic light-emitting diodes with a substantially improved light outcoupling efficiency and a wider angular distribution through applying a layer of zinc oxide periodic nanopillar arrays by pattern replication in non-wetting templates technique. The devices exhibited the peak emission intensity at an emission angle of 40° compared to 0° for reference device using bare ITO-glass. The best device showed a peak luminance efficiency of 95.5 ± 1.5 cd/A at 0° emission (external quantum efficiency - EQE of 38.5 ± 0.1%, power efficiency of 127 ± 1 lm/W), compared to that of the reference device, which has a peak luminance efficiency of 68.0 ± 1.4 cd/A (EQE of 22.0 ± 0.1%, power efficiency of 72 ± 1 lm/W). © 2013 American Institute of Physics.
      Keywords
      Emission angle
      External quantum efficiency
      Light outcoupling
      Nano-pillar arrays
      Non-wetting
      Organic light emitting diodes(OLEDs)
      Pattern replication
      Peak emissions
      Peak luminance
      Phosphorescent organic light-emitting diodes
      Pillar arrays
      Power efficiency
      Reference devices
      Angular distribution
      Electronic equipment
      ITO glass
      Organic light emitting diodes (OLED)
      Zinc oxide
      Efficiency
      Permalink
      http://hdl.handle.net/11693/21084
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.4791786
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Nanotechnology Research Center (NANOTAM) 1006
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