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

Research output: Contribution to journalArticle

21 Citations (Scopus)

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

Fingerprint

Organic Light-emitting Diodes
Graphite
Graphene
Organic light emitting diodes (OLED)
graphene
Anodes
anodes
light emitting diodes
Electroluminescence
luminance
electroluminescence
Luminance
Stacking
Lenses
flexibility
lenses
Lens
Flexible displays
Flexibility
Solid-state Lighting

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., ... 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
Han, Tae Hee ; Park, Min Ho ; Kwon, Sung Joo ; Bae, Sang Hoon ; Seo, Hong Kyu ; Cho, Himchan ; Ahn, Jong-Hyun ; Lee, Tae Woo. / Approaching ultimate flexible organic light-emitting diodes using a graphene anode. In: NPG Asia Materials. 2016 ; Vol. 8, No. 9.
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Han, TH, Park, MH, Kwon, SJ, Bae, SH, Seo, HK, Cho, H, Ahn, J-H & Lee, TW 2016, 'Approaching ultimate flexible organic light-emitting diodes using a graphene anode', NPG Asia Materials, vol. 8, no. 9, e303. https://doi.org/10.1038/am.2016.108

Approaching ultimate flexible organic light-emitting diodes using a graphene anode. / Han, Tae Hee; Park, Min Ho; Kwon, Sung Joo; Bae, Sang Hoon; Seo, Hong Kyu; Cho, Himchan; Ahn, Jong-Hyun; Lee, Tae Woo.

In: NPG Asia Materials, Vol. 8, No. 9, e303, 09.09.2016.

Research output: Contribution to journalArticle

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