Synergetic electrode architecture for efficient graphene-based flexible organic light-emitting diodes

Jaeho Lee, Tae-Hee Han, Min-Ho Park, Dae Yool Jung, Jeongmin Seo, Hong-Kyu Seo, Hyunsu Cho, Eunhye Kim, Jin Chung, Sung-Yool Choi, Taek-Soo Kim, Tae-Woo Lee () and Seunghyup Yoo ()
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Jaeho Lee: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Tae-Hee Han: Pohang University of Science and Technology (POSTECH)
Min-Ho Park: Pohang University of Science and Technology (POSTECH)
Dae Yool Jung: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Jeongmin Seo: KAIST
Hong-Kyu Seo: Pohang University of Science and Technology (POSTECH)
Hyunsu Cho: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Eunhye Kim: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Jin Chung: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Sung-Yool Choi: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)
Taek-Soo Kim: KAIST
Tae-Woo Lee: Pohang University of Science and Technology (POSTECH)
Seunghyup Yoo: School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Graphene-based organic light-emitting diodes (OLEDs) have recently emerged as a key element essential in next-generation displays and lighting, mainly due to their promise for highly flexible light sources. However, their efficiency has been, at best, similar to that of conventional, indium tin oxide-based counterparts. We here propose an ideal electrode structure based on a synergetic interplay of high-index TiO2 layers and low-index hole-injection layers sandwiching graphene electrodes, which results in an ideal situation where enhancement by cavity resonance is maximized yet loss to surface plasmon polariton is mitigated. The proposed approach leads to OLEDs exhibiting ultrahigh external quantum efficiency of 40.8 and 62.1% (64.7 and 103% with a half-ball lens) for single- and multi-junction devices, respectively. The OLEDs made on plastics with those electrodes are repeatedly bendable at a radius of 2.3 mm, partly due to the TiO2 layers withstanding flexural strain up to 4% via crack-deflection toughening.

Date: 2016
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DOI: 10.1038/ncomms11791

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