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Carbazole-based Multiple Resonance Dendrimers with Narrowband Blue Emission for Solution-Processed OLEDs

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Abstract

Three carbazole-based multiple resonance dendrimers namely D1-BNN, D2-BNN and D3-BNN, are developed for solution-processed narrowband blue organic light-emitting diodes (OLEDs) by introducing the first-, second-, and third-generation carbazole dendrons in periphery of boron, nitrogen-doped polycyclic aromatic hydrocarbon skeleton. Different from D1-BNN containing first-generation carbazole dendron showing moderate photoluminescent quantum efficiency (PLQY) of 68% in solid state and broadened emission bands with full-width at half maximum (FWHM) increasing from 26 nm to 34 nm upon doping concentration growing from 10 wt% to 40 wt%, D3-BNN with the third-generation carbazole dendron exhibits high PLQY of 92% and weak dependence of photoluminescent spectra on doping concentration, which can remain narrowband emissions with unchanged FWHM of 24 nm at same doping concentration range. Solution-processed OLEDs employing D3-BNN as emitter reveal blue electroluminescence at 477 nm with FWHM of 24 nm, and maximum external quantum efficiency (EQE) of 17.3% which is kept at 14.4% at doping concentration of 40 wt%, much superior than the D1-BNN devices showing maximum EQE of 13.0% that drops to 3.7% at 40 wt% doping concentration.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 52073282, 52122309, 51833009 and 21975247), the CAS-Croucher Funding Scheme for Joint Laboratories: PolyU-CIAC Joint Laboratory (No. 121522KYSB20200040) and the Open Project of State Key Laboratory of Supramolecular Structure and Materials (No. sklssm2023019). The authors also acknowledge Network and Computing Center, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Jia-Peng Liu, Liang Chen, Lei Zhao, Shu-Meng Wang, Shi-Yang Shao & Li-Xiang Wang

  2. Institute of Chemistry, Northeast Normal University, Changchun, 130024, China

    Jia-Peng Liu & Cui-Yan Tong

  3. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou, 570228, China

    Shi-Yang Shao

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  1. Jia-Peng Liu
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  2. Liang Chen
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  5. Shu-Meng Wang
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  7. Li-Xiang Wang
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Correspondence to Lei Zhao, Cui-Yan Tong or Li-Xiang Wang.

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Liu, JP., Chen, L., Zhao, L. et al. Carbazole-based Multiple Resonance Dendrimers with Narrowband Blue Emission for Solution-Processed OLEDs. Chin J Polym Sci 41, 802–810 (2023). https://doi.org/10.1007/s10118-023-2977-4

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