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

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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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-06
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.7, pp.11791

ISSN
2041-1723
DOI
10.1038/ncomms11791
URI
http://hdl.handle.net/10203/209825
Appears in Collection
EE-Journal Papers(저널논문)ME-Journal Papers(저널논문)
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