Complementarity fusion of boron-oxygen and carbazole blocks enables narrowband blue OLEDs with high performance

Guo Yuan, Yan-Chun Wang, Zhen Zhang (), Jun-Yu Liu, Yi-Hui He, Guo-Wei Chen, Yan-Qing Li () and Jian-Xin Tang ()
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Guo Yuan: Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM)
Yan-Chun Wang: Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM)
Zhen Zhang: East China Normal University, School of Physics and Electronic Science
Jun-Yu Liu: Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM)
Yi-Hui He: East China Normal University, School of Physics and Electronic Science
Guo-Wei Chen: Macau University of Science and Technology, Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering (FIE)
Yan-Qing Li: East China Normal University, School of Physics and Electronic Science
Jian-Xin Tang: Soochow University, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM)

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract The development of ultra-high-definition organic light-emitting diodes (OLEDs) displays requires efficient and narrowband blue emission. Nevertheless, binary host-guest doped narrowband blue OLEDs still face significant challenges in simultaneously realizing high efficiency and negligible roll-off. Herein, a molecular construction strategy through the synergistic interplay between π-conjugation extension and functional complementarity fusion is proposed by incorporating a rigid boron-oxygen (BO) framework with carbazole building blocks. The constructed compounds exhibit increased triplet exciton recycling capability, high excited-state energy levels, and improved charge transporting features, showcasing significant potential as host matrices for blue devices. The sensitizer-free OLEDs achieve the narrowband blue emission with a CIEy value lower than 0.15, a maximum external quantum efficiency of 41.2%, and the suppressed efficiency roll-off at high luminance due to efficient energy transfer to blue guest emitters and elevated horizontal dipole orientation. This work strategically demonstrates a balance between high efficiency and reduced efficiency roll-off in binary narrowband blue OLEDs, representing a substantial advancement in blue electroluminescent technology.

Date: 2025
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DOI: 10.1038/s41467-025-65446-z

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