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

Dae Keun Choi, Dong Hyun Kim, Chang Min Lee, Hassan Hafeez (), Subrata Sarker, Jun Su Yang, Hyung Ju Chae, Geon-Woo Jeong, Dong Hyun Choi, Tae Wook Kim, Seunghyup Yoo, Jinouk Song, Boo Soo Ma, Taek-Soo Kim, Chul Hoon Kim, Hyun Jae Lee, Jae Woo Lee, Donghyun Kim, Tae-Sung Bae, Seung Min Yu, Yong-Cheol Kang, Juyun Park, Kyoung-Ho Kim, Muhammad Sujak, Myungkwan Song, Chang-Su Kim () and Seung Yoon Ryu ()
Additional contact information
Dae Keun Choi: Korea University Sejong Campus
Dong Hyun Kim: Korea University Sejong Campus
Chang Min Lee: Korea University Sejong Campus
Hassan Hafeez: Korea University Sejong Campus
Subrata Sarker: Korea University Sejong Campus
Jun Su Yang: Korea University Sejong Campus
Hyung Ju Chae: Korea University Sejong Campus
Geon-Woo Jeong: Korea University Sejong Campus
Dong Hyun Choi: Korea University Sejong Campus
Tae Wook Kim: Korea University Sejong Campus
Seunghyup Yoo: Korea Advanced Institute of Science and Technology (KAIST)
Jinouk Song: Korea Advanced Institute of Science and Technology (KAIST)
Boo Soo Ma: Korea Advanced Institute of Science and Technology (KAIST)
Taek-Soo Kim: Korea Advanced Institute of Science and Technology (KAIST)
Chul Hoon Kim: Korea University Sejong Campus
Hyun Jae Lee: Korea University Sejong Campus
Jae Woo Lee: Korea University
Donghyun Kim: Korea University
Tae-Sung Bae: Korea Basic Science Institute (KBSI), Analysis & Researcher Division
Seung Min Yu: Korea Basic Science Institute (KBSI), Analysis & Researcher Division
Yong-Cheol Kang: Pukyong National University 45 Yongso-Ro, Nam-gu
Juyun Park: Pukyong National University 45 Yongso-Ro, Nam-gu
Kyoung-Ho Kim: Chungbuk National University
Muhammad Sujak: Chungbuk National University
Myungkwan Song: Korea Institute of Materials Science (KIMS)
Chang-Su Kim: Korea Institute of Materials Science (KIMS)
Seung Yoon Ryu: Korea University Sejong Campus

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-23203-y

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