High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

Maria Vasilopoulou (), Abd. Rashid bin Mohd Yusoff (), Matyas Daboczi, Julio Conforto, Anderson Emanuel Ximim Gavim, Wilson Jose Silva, Andreia Gerniski Macedo, Anastasia Soultati, George Pistolis, Fabio Kurt Schneider, Yifan Dong, Polina Jacoutot, Georgios Rotas, Jang Jin, Georgios C. Vougioukalakis, Christos L. Chochos (), Ji-Seon Kim and Nicola Gasparini ()
Additional contact information
Maria Vasilopoulou: Terma Patriarchou Grigoriou
Abd. Rashid bin Mohd Yusoff: Pohang University of Science and Technology (POSTECH)
Matyas Daboczi: Imperial College London
Julio Conforto: Universidade Tecnologica Federal do Parana, GPGEI
Anderson Emanuel Ximim Gavim: Universidade Tecnologica Federal do Parana, GPGEI
Wilson Jose Silva: Universidade Tecnologica Federal do Parana, GPGEI
Andreia Gerniski Macedo: Universidade Tecnologica Federal do Parana, GPGEI
Anastasia Soultati: Terma Patriarchou Grigoriou
George Pistolis: Terma Patriarchou Grigoriou
Fabio Kurt Schneider: Universidade Tecnologica Federal do Parana, GPGEI
Yifan Dong: Imperial College London
Polina Jacoutot: Imperial College London
Georgios Rotas: National and Kapodistrian University of Athens
Georgios C. Vougioukalakis: National and Kapodistrian University of Athens
Christos L. Chochos: National Hellenic Research Foundation
Ji-Seon Kim: Imperial College London
Nicola Gasparini: Imperial College London

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Blue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures.

Date: 2021
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DOI: 10.1038/s41467-021-25135-z

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