Development of novel acceptors with deep LUMO energy levels

Pure-organic red exciplex emitters are far from satisfactory in terms of quantity and efficiency. The narrow lowest unoccupied molecular orbital (LUMO) energy levels range of reported acceptors together with the intrinsic exciton non-radiative decay are the dominant factors restricting the progress...

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Bibliographic Details
Published in:Journal of physics. Conference series 2023-06, Vol.2529 (1), p.12001
Main Authors: Yang, Hao-Yu, Yin, Pei-feng, Zhang, Heng-yuan, Zhang, Ming, Lin, Hui, Tao, Si-Lu, Zheng, Cai-Jun
Format: Article
Language:English
Subjects:
Benzonitrile
Emitters
Energy levels
Excitons
Molecular orbitals
Physics
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Summary:Pure-organic red exciplex emitters are far from satisfactory in terms of quantity and efficiency. The narrow lowest unoccupied molecular orbital (LUMO) energy levels range of reported acceptors together with the intrinsic exciton non-radiative decay are the dominant factors restricting the progress of red exciplexes. Herein, two acceptor molecules operating at unique LUMO of -3.51 and -3.56 eV, namely 4-(6-([1, 1’: 3’, 1”-terphenyl]-5’-yl)-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl) benzonitrile (CNAI-tPh) and 4-(6-(4-(4, 6-diphenyl-1, 3, 5-triazin-2-yl)phenyl)-1, 3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl) benzonitrile (CNAI-TRz), were developed. Through binding to a donor whose HOMO energy level is -5.53 eV, the CNAI-TRz-related OLEDs attained a higher device efficiency amounting to 7.7% with a red-shifted spectrum compared to the CNAI-tPh-related devices. These results are remarkable among the reported pure-organic red exciplex-based OLEDs and demonstrate the tremendous potential of our synthesized acceptors in efficient red exciplexes.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2529/1/012001