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Revealing the excited-state mechanisms of the polymorphs of a hot exciton material

Author

Listed:
  • Ziqi Deng

    (Pokfulam Road)

  • Chao Huang

    (Pokfulam Road)

  • Yunfeng Luo

    (Pokfulam Road)

  • Jiaxing He

    (Pokfulam Road)

  • Lan Li

    (Pokfulam Road)

  • Xinyu Pang

    (Southern University of Science and Technology)

  • Guanheng Huang

    (Pokfulam Road)

  • David Lee Phillips

    (Pokfulam Road)

Abstract

As the investigation of high efficiency thermally activated delayed fluorescence (TADF) materials become more mature, regulating the emission properties for single organic luminescence molecules has gained increasing interest recently. Herein, the donor-acceptor compounds F-AQ comprised of fluorene and anthraquinone is reported, and it exhibits a polymorphism with muti-color emission and TADF from high-level intersystem crossing (hRISC). The photodynamics and excited-state transient species were studied by femtosecond transient absorption (fs-TA) spectroscopy. As a result, an unambiguous signal of through space charge transfer (TSCT) was observed in the fs-TA spectra of the crystal with the π-π interaction between the fluorene and anthraquinone groups, whereas the other amorphous solids and crystal only show a conventional deactivation pathway of hRISC-TADF. In this study, we successfully realize the direct observation of the morphism-dependent TSCT in a crystal, which provides the observations in solid-state ultrafast excited-state dynamics and deepens the insight into the design of potential mechanochromic materials and thermochromic utilization of the polymorphism of organic luminescence molecules.

Suggested Citation

  • Ziqi Deng & Chao Huang & Yunfeng Luo & Jiaxing He & Lan Li & Xinyu Pang & Guanheng Huang & David Lee Phillips, 2025. "Revealing the excited-state mechanisms of the polymorphs of a hot exciton material," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-024-55569-0
    DOI: 10.1038/s41467-024-55569-0
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    1. Gobinda Das & Bikash Garai & Thirumurugan Prakasam & Farah Benyettou & Sabu Varghese & Sudhir Kumar Sharma & Felipe Gándara & Renu Pasricha & Maria Baias & Ramesh Jagannathan & Na’il Saleh & Mourad El, 2022. "Fluorescence turn on amine detection in a cationic covalent organic framework," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    2. Wenqing Xu & Guanheng Huang & Zhan Yang & Ziqi Deng & Chen Zhou & Jian-An Li & Ming-De Li & Tao Hu & Ben Zhong Tang & David Lee Phillips, 2024. "Nucleic-acid-base photofunctional cocrystal for information security and antimicrobial applications," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Chunguang Zhai & Xiu Yin & Shifeng Niu & Mingguang Yao & Shuhe Hu & Jiajun Dong & Yuchen Shang & Zhigang Wang & Quanjun Li & Bertil Sundqvist & Bingbing Liu, 2021. "Molecular insertion regulates the donor-acceptor interactions in cocrystals for the design of piezochromic luminescent materials," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    4. Jianyu Zhang & Parvej Alam & Siwei Zhang & Hanchen Shen & Lianrui Hu & Herman H. Y. Sung & Ian D. Williams & Jianwei Sun & Jacky W. Y. Lam & Haoke Zhang & Ben Zhong Tang, 2022. "Secondary through-space interactions facilitated single-molecule white-light emission from clusteroluminogens," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
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