Researchers Propose Graphene Anode for Flexible OLEDs

Summary:

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, 45.2% (~396.4 cd/A, 87.3% with a hemispherical lens) and a very low efficiency roll-off at a high luminance of ~ 6.6% at 10 000 cd/m² (~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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The work was supported by a National Research Foundation of Korea (NRF) grant funded by the by the Ministry of Science, ICT & Future Planning (MSIP) (NRF-2016R1A3B1908431), and the Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by
the Ministry of Science, ICT & Future Planning (MSIP) (NRF-2014M3A7B4051747).