Approaching ultimate flexible organic light-emitting diodes using a graphene anode

Tae Hee Han, Min Ho Park, Sung Joo Kwon, Sang Hoon Bae, Hong Kyu Seo, Himchan Cho, Jong Hyun Ahn, Tae Woo Lee

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Abstract

Ultimate flexible organic light-emitting diodes (OLEDs) should have an ultra-high device efficiency, a low-efficiency roll-off at a high luminance and excellent flexibility. Here, we realized flexible tandem OLEDs using a graphene anode with a very high electroluminescent efficiency of ∼ 205.9 cd A-1, 45.2% (∼396.4 cd A- 1, 87.3% with a hemispherical lens) and a very low efficiency roll-off at a high luminance of ∼ 6.6% at 10 000 cd m- 2 (∼3.8% with a hemispherical lens) by stacking two organic electroluminescence (EL) units. For the first time, we used an easily controlled and low-temperature processable charge generation layer with lithium nitride (Li3N). This simultaneously provided efficient stacking of EL units and enhanced compatibility of the flexible device on a thin plastic substrate. The flexible tandem OLEDs with a graphene anode also showed great flexibility against bending up to a bending strain of 6.7%. These results represent a significant advancement towards the production of next-generation flexible displays and solid-state lighting that use a graphene anode.

Original languageEnglish
Article numbere303
JournalNPG Asia Materials
Volume8
Issue number9
DOIs
Publication statusPublished - 2016 Sep 9

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All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Han, T. H., Park, M. H., Kwon, S. J., Bae, S. H., Seo, H. K., Cho, H., Ahn, J. H., & Lee, T. W. (2016). Approaching ultimate flexible organic light-emitting diodes using a graphene anode. NPG Asia Materials, 8(9), [e303]. https://doi.org/10.1038/am.2016.108