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Highly Red Emissive Conjugated Homopolymers Based on Double B←N Bridged Bipyridine Unit

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Abstract

Conjugated homopolymers based on six-member rings, e.g., polyfluorene, always exhibit blue emission and conjugated homopolymers based on five-member rings, e.g., polythiophene, can give red emission with low efficiency. In this work, we report a series of new conjugated homopolymers based on six-member rings with high-efficiency deep-red emission. The repeating units of the red light emitting homopolymers are double B←N bridged bipyridine (BNBP) with the boron atoms functionalized with diphenyl, borafluorene, and 2,7-di-tert-butyl-borafluorene groups, respectively. The relationship between the chemical structures and the opto-electronic properties of the monomers and the homopolymers has been systematically studied. The three polymers emit pure red light (λmax=656 nm) or deep red light (λmax=693 nm) with fluorescence quantum efficiency in solution higher than 60%. The polymers can be used as the emitters in solution-processed organic light-emitting diodes with red emission and decent device performance. This work indicates a new strategy to design highly efficient light emitting conjugated polymers.

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Data Availability Statement

The related data (DOI: 10.57760/sciencedb.j00189.00021) for this paper is available in the Data Repository of China Association for Science and Technology (https://www.scidb.cn/c/cjps).

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 22135007 and 52073281).

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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

    Yu-Yue Gao, Kai-Yuan Zhang, Shu-Meng Wang, Hui Tong & Jun Liu

  2. School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Yu-Yue Gao, Kai-Yuan Zhang, Hui Tong & Jun Liu

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  1. Yu-Yue Gao
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Correspondence to Jun Liu.

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Gao, YY., Zhang, KY., Wang, SM. et al. Highly Red Emissive Conjugated Homopolymers Based on Double B←N Bridged Bipyridine Unit. Chin J Polym Sci 42, 1029–1037 (2024). https://doi.org/10.1007/s10118-024-3123-7

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