Extremely efficient flexible organic light-emitting diodes with modified graphene anode

Tae Hee Han, Youngbin Lee, Mi Ri Choi, Seong Hoon Woo, Sang Hoon Bae, Byung Hee Hong, Jong Hyun Ahn, Tae Woo Lee

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981 Citations (Scopus)


Although graphene films have a strong potential to replace indium tin oxide anodes in organic light-emitting diodes (OLEDs), to date, the luminous efficiency of OLEDs with graphene anodes has been limited by a lack of efficient methods to improve the low work function and reduce the sheet resistance of graphene films to the levels required for electrodes1-4. Here, we fabricate flexible OLEDs by modifying the graphene anode to have a high work function and low sheet resistance, and thus achieve extremely high luminous efficiencies (37.2 lm W-1 in fluorescent OLEDs, 102.7 lm W -1 in phosphorescent OLEDs), which are significantly higher than those of optimized devices with an indium tin oxide anode (24.1 lm W -1 in fluorescent OLEDs, 85.6 lm W-1 in phosphorescent OLEDs). We also fabricate flexible white OLED lighting devices using the graphene anode. These results demonstrate the great potential of graphene anodes for use in a wide variety of high-performance flexible organic optoelectronics.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalNature Photonics
Issue number2
Publication statusPublished - 2012 Feb


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Han, T. H., Lee, Y., Choi, M. R., Woo, S. H., Bae, S. H., Hong, B. H., Ahn, J. H., & Lee, T. W. (2012). Extremely efficient flexible organic light-emitting diodes with modified graphene anode. Nature Photonics, 6(2), 105-110. https://doi.org/10.1038/nphoton.2011.318