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Pressure-controlled free exciton and self-trapped exciton emission in quasi-one-dimensional hybrid lead bromides

Author

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  • Bin Xu

    (Southern University of Science and Technology (SUSTech), Shenzhen)

  • Yawen Li

    (Southern University of Science and Technology (SUSTech), Shenzhen)

  • Peibin Hong

    (Southern University of Science and Technology (SUSTech), Shenzhen)

  • Peijie Zhang

    (Southern University of Science and Technology (SUSTech), Shenzhen)

  • Jiang Han

    (Southern University of Science and Technology (SUSTech), Shenzhen)

  • Zewen Xiao

    (Huazhong University of Science and Technology)

  • Zewei Quan

    (Southern University of Science and Technology (SUSTech), Shenzhen)

Abstract

Hybrid metal halides represent a novel type of semiconductor light emitters with intriguing excitonic emission properties, including free exciton emission and self-trapped exciton emission. Achieving precise control over these two excitonic emissions in hybrid metal halides is highly desired yet remains challenging. Here, the complete transformation from intrinsically broadband self-trapped exciton emission to distinctively sharp free exciton emission in a quasi-one-dimensional hybrid metal halide (C2H10N2)8[Pb4Br18]·6Br with a ribbon width of n = 4, is successfully achieved based on high-pressure method. During compression, pressure-induced phonon hardening continuously reduces exciton–phonon coupling, therefore suppressing excitonic localization and quenching the original self-trapped exciton emission. Notably, further compression triggers excitonic delocalization to induce intense free exciton emission, accompanied with reduced carrier effective masses and improved charge distribution. Controlled high-pressure investigations indicate that the ribbon width of n > 2 is necessary to realize excitonic delocalization and generate free exciton emissions in similar quasi-one-dimensional hybrid metal halides. This work presents an important photophysical process of excitonic transitions from self-trapped exciton emission to free exciton emission in quasi-one-dimensional hybrid metal halides without chemical regulation, promoting the rational synthesis of hybrid metal halides with desired excitonic emissions.

Suggested Citation

  • Bin Xu & Yawen Li & Peibin Hong & Peijie Zhang & Jiang Han & Zewen Xiao & Zewei Quan, 2024. "Pressure-controlled free exciton and self-trapped exciton emission in quasi-one-dimensional hybrid lead bromides," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51836-2
    DOI: 10.1038/s41467-024-51836-2
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    References listed on IDEAS

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    1. Suixuan Li & Zihao Qin & Huan Wu & Man Li & Martin Kunz & Ahmet Alatas & Abby Kavner & Yongjie Hu, 2022. "Anomalous thermal transport under high pressure in boron arsenide," Nature, Nature, vol. 612(7940), pages 459-464, December.
    2. Yuanzhi Jiang & Changjiu Sun & Jian Xu & Saisai Li & Minghuan Cui & Xinliang Fu & Yuan Liu & Yaqi Liu & Haoyue Wan & Keyu Wei & Tong Zhou & Wei Zhang & Yingguo Yang & Jien Yang & Chaochao Qin & Shuyan, 2022. "Synthesis-on-substrate of quantum dot solids," Nature, Nature, vol. 612(7941), pages 679-684, December.
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