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

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Title: High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence
Authors: Vasilopoulou, M
Mohd Yusoff, ARB
Daboczi, M
Conforto, J
Gavim, AEX
Da Silva, WJ
Macedo, AG
Soultati, A
Pistolis, G
Schneider, FK
Dong, Y
Jacoutot, P
Rotas, G
Jang, J
Vougioukalakis, GC
Chochos, CL
Kim, J-S
Gasparini, N
Item Type: Journal Article
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 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.
Issue Date: 11-Aug-2021
Date of Acceptance: 20-Jul-2021
URI: http://hdl.handle.net/10044/1/90999
DOI: 10.1038/s41467-021-25135
ISSN: 2041-1723
Publisher: Nature Research
Journal / Book Title: Nature Communications
Volume: 12
Copyright Statement: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
ACTIVATED DELAYED FLUORESCENCE
EXTERNAL QUANTUM EFFICIENCY
DEGRADATION
PERFORMANCE
DERIVATIVES
MECHANISMS
EXCIPLEX
MOBILITY
DEVICES
Publication Status: Published
Article Number: ARTN 4868
Appears in Collections:Physics
Chemistry
Experimental Solid State
Faculty of Natural Sciences



This item is licensed under a Creative Commons License Creative Commons