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Blue light-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide unit in alkyl side chain

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Abstract

Blue light-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide (SO) unit in alkyl side chain (PF-FSOs and PF-CzSOs) were synthesized. All the polymers show high thermal stability with the decomposition temperatures over 400 °C. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels of the copolymer slightly decrease with the increase of SO content in side chain. PL spectra of the polymers show slightly red shift and broadening with the increase of solvent polarities, indicating unremarkable intramolecular charge transfer (ICT) effect in the polymers containing SO unit in alkyl side chain. EL spectra of the polymers are almost unchanged in the current densities from 100 to 400 mA cm−2, indicating the superb EL stability of the resulted polymers. The EL spectra of the copolymers exhibit obvious blue-shift and narrowing with the CIE of (0.18, 0.11) for PF-FSO10 and (0.17, 0.11) for PF-CzSO10, respectively, compared with PF-SO10 containing SO unit in main chain with the CIE of (0.16, 0.17) and PFO with the CIE of (0.18, 0.18). The superior device performances were obtained with the luminous efficiency (LEmax) of 1.17 and 0.68 cd A−1 for PF-FSO15 and PF-CzSO20, respectively, compared with the LEmax of 0.37 cd A−1 for PFO. The results indicate that linking SO unit to alkyl side chain of the polyfluorene is a promising strategy for efficient blue light-emitting polymers.

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Acknowledgments

This work was supported by the National Key Basic Research and Development Program of China (2015CB655004), the National Natural Science Foundation of China (51473054, 91333206), and the Fundamental Research Funds for the Central Universities, South China of Technology (2017MS020).

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Authors and Affiliations

  1. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China

    Yiwen Fang, Jie Liu, Yuhao Zhang, Ting Guo, Fei Huang, Wei Yang & Yong Cao

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  1. Yiwen Fang
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  2. Jie Liu
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  3. Yuhao Zhang
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  4. Ting Guo
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  5. Fei Huang
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  6. Wei Yang
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  7. Yong Cao
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Correspondence to Ting Guo or Wei Yang.

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Fang, Y., Liu, J., Zhang, Y. et al. Blue light-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide unit in alkyl side chain. Sci. China Chem. 60, 1356–1366 (2017). https://doi.org/10.1007/s11426-017-9100-0

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  • DOI: https://doi.org/10.1007/s11426-017-9100-0

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