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Highly efficient, heat dissipating, stretchable organic light-emitting diodes based on a MoO3/Au/MoO3 electrode with encapsulation.

Dae Keun ChoiDong Hyun KimChang Min LeeHassan HafeezSubrata SarkerJun Su YangHyung Ju ChaeGeon-Woo JeongDong Hyun ChoiTae Wook KimSeunghyup YooJinouk SongBoo Soo MaTaek-Soo KimChul Hoon KimHyun Jae LeeJae Woo LeeDonghyun KimTae-Sung BaeSeung Min YuYong-Cheol KangJuyun ParkKyoung-Ho KimMuhammad SujakMyungkwan SongChang Su KimSeung Yoon Ryu
Published in: Nature communications (2021)
Stretchable organic light-emitting diodes are ubiquitous in the rapidly developing wearable display technology. However, low efficiency and poor mechanical stability inhibit their commercial applications owing to the restrictions generated by strain. Here, we demonstrate the exceptional performance of a transparent (molybdenum-trioxide/gold/molybdenum-trioxide) electrode for buckled, twistable, and geometrically stretchable organic light-emitting diodes under 2-dimensional random area strain with invariant color coordinates. The devices are fabricated on a thin optical-adhesive/elastomer with a small mechanical bending strain and water-proofed by optical-adhesive encapsulation in a sandwiched structure. The heat dissipation mechanism of the thin optical-adhesive substrate, thin elastomer-based devices or silicon dioxide nanoparticles reduces triplet-triplet annihilation, providing consistent performance at high exciton density, compared with thick elastomer and a glass substrate. The performance is enhanced by the nanoparticles in the optical-adhesive for light out-coupling and improved heat dissipation. A high current efficiency of ~82.4 cd/A and an external quantum efficiency of ~22.3% are achieved with minimum efficiency roll-off.
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