Photo-thermo-induced room-temperature phosphorescence through solid-state molecular motion

Xing Wang Liu, Weijun Zhao, Yue Wu (), Zhengong Meng, Zikai He, Xin Qi, Yiran Ren, Zhen-Qiang Yu () and Ben Zhong Tang ()
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Xing Wang Liu: Shenzhen University
Weijun Zhao: East China University of Science and Technology
Yue Wu: Shenzhen University
Zhengong Meng: Shenzhen University
Zikai He: HIT Campus of University Town
Xin Qi: Shenzhen University
Yiran Ren: Shenzhen University
Zhen-Qiang Yu: Shenzhen University
Ben Zhong Tang: The Chinese University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The development of smart-responsive materials, in particular those with non-invasive, rapid responsive phosphorescence, is highly desirable but has rarely been described. Herein, we designed and prepared a series of molecular rotors containing a triazine core and three bromobiphenyl units: o-Br-TRZ, m-Br-TRZ, and p-Br-TRZ. The bromine and triazine moieties serve as room temperature phosphorescence-active units, and the bromobiphenyl units serve as rotors to drive intramolecular rotation. When irradiated with strong ultraviolet photoirradiation, intramolecular rotations of o-Br-TRZ, m-Br-TRZ, and p-Br-TRZ increase, successively resulting in a photothermal effect via molecular motions. Impressively, the photothermal temperature attained by p-Br-TRZ is as high as 102 °C, and synchronously triggers its phosphorescence due to the ordered molecular arrangement after molecular motion. The thermal effect is expected to be important for triggering efficient phosphorescence, and the photon input for providing a precise and non-invasive stimulus. Such sequential photo-thermo-phosphorescence conversion is anticipated to unlock a new stimulus-responsive phosphorescence material without chemicals invasion.

Date: 2022
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DOI: 10.1038/s41467-022-31481-3

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