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

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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 similar to 205.9 cd A(-1), 45.2% (similar to 396.4 cd A(-1), 87.3% with a hemispherical lens) and a very low efficiency roll-off at a high luminance of similar to 6.6% at 10 000 cd m(-2) (similar to 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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-09
Language
English
Article Type
Article
Citation

NPG ASIA MATERIALS, v.8

ISSN
1884-4049
DOI
10.1038/am.2016.108
URI
http://hdl.handle.net/10203/281293
Appears in Collection
MS-Journal Papers(저널논문)
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