Secondary through-space interactions facilitated single-molecule white-light emission from clusteroluminogens

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 () and Ben Zhong Tang ()
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Jianyu Zhang: The Hong Kong University of Science and Technology
Parvej Alam: The Hong Kong University of Science and Technology
Siwei Zhang: The Hong Kong University of Science and Technology
Hanchen Shen: The Hong Kong University of Science and Technology
Lianrui Hu: The Hong Kong University of Science and Technology
Herman H. Y. Sung: The Hong Kong University of Science and Technology
Ian D. Williams: The Hong Kong University of Science and Technology
Jianwei Sun: The Hong Kong University of Science and Technology
Jacky W. Y. Lam: The Hong Kong University of Science and Technology
Haoke Zhang: Zhejiang University
Ben Zhong Tang: The Hong Kong University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Clusteroluminogens refer to some non-conjugated molecules that show visible light and unique electronic properties with through-space interactions due to the formation of aggregates. Although mature and systematic theories of molecular photophysics have been developed to study conventional conjugated chromophores, it is still challenging to endow clusteroluminogens with designed photophysical properties by manipulating through-space interactions. Herein, three clusteroluminogens with non-conjugated donor-acceptor structures and different halide substituents are designed and synthesized. These compounds show multiple emissions and even single-molecule white-light emission in the crystalline state. The intensity ratio of these emissions is easily manipulated by changing the halide atom and excitation wavelength. Experimental and theoretical results successfully disclose the electronic nature of these multiple emissions: through-space conjugation for short-wavelength fluorescence, through-space charge transfer based on secondary through-space interactions for long-wavelength fluorescence, and room-temperature phosphorescence. The introduction of secondary through-space interactions to clusteroluminogens not only enriches their varieties of photophysical properties but also inspires the establishment of novel aggregate photophysics for clusteroluminescence.

Date: 2022
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DOI: 10.1038/s41467-022-31184-9

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