Conformation-dependent dynamic organic phosphorescence through thermal energy driven molecular rotations

Juan Wei, Chenyuan Liu, Jiayu Duan, Aiwen Shao, Jinlu Li, Jiangang Li, Wenjie Gu, Zixian Li, Shujuan Liu, Yun Ma (), Wei Huang () and Qiang Zhao ()
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Juan Wei: Nanjing University of Posts and Telecommunications (NUPT)
Chenyuan Liu: Nanjing University of Posts and Telecommunications (NUPT)
Jiayu Duan: Nanjing University of Posts and Telecommunications (NUPT)
Aiwen Shao: Nanjing University of Posts and Telecommunications (NUPT)
Jinlu Li: Nanjing University of Posts and Telecommunications (NUPT)
Jiangang Li: Nanjing University of Posts and Telecommunications (NUPT)
Wenjie Gu: Nanjing University of Posts and Telecommunications (NUPT)
Zixian Li: Nanjing University of Posts and Telecommunications (NUPT)
Shujuan Liu: Nanjing University of Posts and Telecommunications (NUPT)
Yun Ma: Nanjing University of Posts and Telecommunications (NUPT)
Wei Huang: Nanjing University of Posts and Telecommunications (NUPT)
Qiang Zhao: Nanjing University of Posts and Telecommunications (NUPT)

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Organic room-temperature phosphorescent (RTP) materials exhibiting reversible changes in optical properties upon exposure to external stimuli have shown great potential in diverse optoelectronic fields. Particularly, dynamic manipulation of response behaviors for such materials is of fundamental significance, but it remains a formidable challenge. Herein, a series of RTP polymers were prepared by incorporating phosphorescent rotors into polymer backbone, and these materials show color-tunable persistent luminescence upon excitation at different wavelengths. Experimental results and theoretical calculations revealed that the various molecular conformations of monomers are responsible for the excitation wavelength-dependent (Ex-De) RTP behavior. Impressively, after gaining insights into the underlying mechanism, dynamic control of Ex-De RTP behavior was achieved through thermal energy driven molecular rotations of monomers. Eventually, we demonstrate the practical applications of these amorphous polymers in anti-counterfeiting areas. These findings open new opportunities for the control of response behaviors of smart-responsive RTP materials through external stimuli rather than conventional covalent modification method.

Date: 2023
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DOI: 10.1038/s41467-023-35930-5

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