High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence
File(s)
Published version
Author(s)
Vasilopoulou, Maria
Mohd Yusoff, Abd Rashid bin
Daboczi, Matyas
Conforto, Julio
Gavim, Anderson Emanuel Ximim
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.
Date Issued
2021-08-11
Date Acceptance
2021-07-20
Citation
Nature Communications, 2021, 12
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/.
License URL
Subjects
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