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Customizable Organic Charge-Transfer Cocrystals for the Dual-Mode Optoelectronics in the NIR (II) Window

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    Article

    Customizable Organic Charge-Transfer Cocrystals for the Dual-Mode Optoelectronics in the NIR (II) Window
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    • Yue Yu
      Yue Yu
      Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China
      More by Yue Yu
    • Xing-Yu Xia
      Xing-Yu Xia
      Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China
      More by Xing-Yu Xia
    • Chao-Fei Xu
      Chao-Fei Xu
      Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China
      More by Chao-Fei Xu
    • Zhao-Ji Lv
      Zhao-Ji Lv
      Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China
      More by Zhao-Ji Lv
    • Xue-Dong Wang*
      Xue-Dong Wang
      Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China
      *Email: [email protected]
      More by Xue-Dong Wang
      Orcidhttps://orcid.org/0000-0003-0935-0835
    • Liang-Sheng Liao*
      Liang-Sheng Liao
      Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu 215123, China
      Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa, Macau SAR 999078, China
      *Email: [email protected]
      More by Liang-Sheng Liao
      Orcidhttps://orcid.org/0000-0002-2352-9666
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2024, 146, 17, 11845–11854
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jacs.4c00648
    Published April 22, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    Organic molecules have been regarded as ideal candidates for near-infrared (NIR) optoelectronic active materials due to their customizability and ease of large-scale production. However, constrained by the intricate molecular design and severe energy gap law, the realization of optoelectronic devices in the second near-infrared (NIR (II)) region with required narrow band gaps presents more challenges. Herein, we have originally proposed a cocrystal strategy that utilizes intermolecular charge–transfer interaction to drive the redshift of absorption and emission spectra of a series BFXTQ (X = 0, 1, 2, 4) cocrystals, resulting in the spectra located at NIR (II) window and reducing the optical bandgap to ∼0.98 eV. Significantly, these BFXTQ-based optoelectronic devices can exhibit dual-mode optoelectronic characteristics. An investigation of a series of BFXTQ-based photodetectors exhibits detectivity (D*) surpassing 1013 Jones at 375 to 1064 nm with a maximum of 1.76 × 1014 Jones at 1064 nm. Moreover, the radiative transition of CT excitons within the cocrystals triggers NIR emission over 1000 nm with a photoluminescence quantum yield (PLQY) of ∼4.6% as well as optical waveguide behavior with a low optical-loss coefficient of 0.0097 dB/μm at 950 nm. These results promote the advancement of an emerging cocrystal approach in micro/nanoscale NIR multifunctional optoelectronics.

    Copyright © 2024 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/jacs.4c00648.

    • Materials used; preparation details; test analysis method; microscopy of supplementary structures; XRD patterns of the as-prepared microstructures; SEM, AFM, and TEM images for BFXTQ cocrystals; photodetector performance under illumination of different monochromatic lights; transient absorption curve; and crystallographic data of the single crystals (PDF)

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    CCDC 2288439–2288440 and 2288442 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing [email protected], or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033.

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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2024, 146, 17, 11845–11854
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jacs.4c00648
    Published April 22, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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