Color-stable, ITO-free white organic light-emitting diodes with enhanced efficiency using solution-processed transparent electrodes and optical outcoupling layers

Hong-Wei Chang, Yong Hyun Kim, Jonghee Lee, Simone Hofmann, Bjoern Luessem, Lars Mueller-Meskamp, Malte C. Gather, Karl Leo, Chung-Chih Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

In this work, we demonstrate color-stable, ITO-free white organic light-emitting diodes (WOLEDs) with enhanced efficiencies by combining the high-conductivity conducting polymer PEDOT:PSS as transparent electrode and a nanoparticle-based scattering layer (NPSL) as the effective optical out-coupling layer. In addition to efficiency enhancement, the NPSL is also beneficial to the stabilization of electroluminescent spectra/colors over viewing angles. Both the PEDOT:PSS and the NPSL can be fabricated by simple, low-temperature solution processing. The integration of both solution-processable transparent electrodes and light extraction structures into OLEDs is particularly attractive for applications since they simultaneously provide manufacturing, cost and efficiency advantages. 

Original languageEnglish
Pages (from-to)1028-1034
Number of pages7
JournalOrganic Electronics
Volume15
Issue number5
Early online date5 Mar 2014
DOIs
Publication statusPublished - May 2014

Keywords

  • OLEDs
  • Transparent electrode
  • Conducting polymer
  • Optical outcoupling
  • Indium tin oxide
  • Conductive polymer anodes
  • Work function
  • Photoelectron-spectroscopy
  • Devices
  • Cells
  • Films
  • Stability

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