• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Light extraction efficiency enhancement of colloidal quantum dot light-emitting diodes using large-scale nanopillar arrays

      Thumbnail
      View / Download
      2.0 Mb
      Author
      Yang, X.
      Dev, K.
      Wang, J.
      Mutlugun, E.
      Dang, C.
      Zhao Y.
      Liu, S.
      Tang, Y.
      Tan S.T.
      Sun, X. W.
      Demir, Hilmi Volkan
      Date
      2014
      Source Title
      Advanced Functional Materials
      Print ISSN
      1616-301X
      Publisher
      Wiley-VCH Verlag
      Volume
      24
      Issue
      38
      Pages
      5977 - 5984
      Language
      English
      Type
      Article
      Item Usage Stats
      148
      views
      209
      downloads
      Abstract
      A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced light extraction efficiency by applying a layer of large-scale, low-cost, periodic nanopillar arrays. Zinc oxide nanopillars are grown on the glass surface of the substrate using a simple, efficient method of non-wetting templates. With the layer of ZnO nanopillar array as an optical outcoupling medium, a record high current efficiency (CE) of 26.6 cd/A is achieved for QLEDs. Consequently, the corresponding external quantum efficiency (EQE) of 9.34% reaches the highest EQE value for green-emitting QLEDs. Also, the underlying physical mechanisms enabling the enhanced light-extraction are investigated, which leads to an excellent agreement of the numerical results based on the mode theory with the experimental measurements. This study is the first account for QLEDs offering detailed insight into the light extraction efficiency enhancement of QLED devices. The method demonstrated here is intended to be useful not only for opening up a ubiquitous strategy for designing high-performance QLEDs but also with respect to fundamental research on the light extraction in QLEDs.
      Keywords
      Quantum dots
      Nanocrystals
      Light-emitting diodes
      Light outcoupling
      Nanopillars
      Core-shell nanocrystals
      Low-haze
      Oleds
      Electroluminescence
      Displays
      Devices
      Permalink
      http://hdl.handle.net/11693/12670
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/adfm.201400190
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      Show full item record

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy