Approaching Ultimate Flexible Organic Light-Emitting Diodes Using Graphene Anodeopen access
- Authors
- Han, Tae Hee; Park, Min-Ho; Kwon, Sung-Joo; Bae, Sang-Hoon; Seo, Hong-Kyu; Cho, Himchan; Ahn, Jong-Hyun; Lee, Tae-Woo
- Issue Date
- Sep-2016
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NPG ASIA MATERIALS, v.8, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- NPG ASIA MATERIALS
- Volume
- 8
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/22182
- DOI
- 10.1038/am.2016.108
- ISSN
- 1884-4049
- 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 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.
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