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Bright and efficient full-color colloidal quantum dot light-emitting diodes using an inverted device structure.

Authors
  • Kwak, Jeonghun
  • Bae, Wan Ki
  • Lee, Donggu
  • Park, Insun
  • Lim, Jaehoon
  • Park, Myeongjin
  • Cho, Hyunduck
  • Woo, Heeje
  • Yoon, Do Y
  • Char, Kookheon
  • Lee, Seonghoon
  • Lee, Changhee
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
May 09, 2012
Volume
12
Issue
5
Pages
2362–2366
Identifiers
DOI: 10.1021/nl3003254
PMID: 22468609
Source
Medline
License
Unknown

Abstract

We report highly bright and efficient inverted structure quantum dot (QD) based light-emitting diodes (QLEDs) by using solution-processed ZnO nanoparticles as the electron injection/transport layer and by optimizing energy levels with the organic hole transport layer. We have successfully demonstrated highly bright red, green, and blue QLEDs showing maximum luminances up to 23,040, 218,800, and 2250 cd/m(2), and external quantum efficiencies of 7.3, 5.8, and 1.7%, respectively. It is also noticeable that they showed turn-on voltages as low as the bandgap energy of each QD and long operational lifetime, mainly attributed to the direct exciton recombination within QDs through the inverted device structure. These results signify a remarkable progress in QLEDs and offer a practicable platform for the realization of QD-based full-color displays and lightings.

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