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Polymer-Stretching-Regulated Microscopic Photoluminescence of Vibration-Induced Emission (VIE) Molecules

preprint
submitted on 22.04.2021, 07:20 and posted on 22.04.2021, 13:39 by Fan Gu, Yuanhao Li, Tao Jiang, Jianhua Su, Xiang Ma, He Tian
Photoluminescence materials play an inseparable role in the application of polymer systems. However, intrinsic polymer systems have rarely been intuitively interpreted based on photoluminescence regulation. A novel photoluminescence mechanism called vibration-induced emission (VIE) has recently drawn great attention due to its multicolor fluorescence from a single molecular entity. Based on the unique fluorescent properties of VIE molecules, we doped 9,14-diphenyl-9,14-dihydrodibenzo[a,c]-phenazine (DPAC) and its derivative DPAC-CN in two stretchable polymers, poly(ε-caprolactone) and ethylene vinyl acetate (EVA) copolymer, to explore the important relationship between luminophores and polymer systems. This research focused on the multicolor photoluminescence of the obtained blend films that resulted from stretching exertions and temperature responses. The successive conformational alterations of VIE molecules endowed continuous photoluminescent changes. Meanwhile, the multicolor variations also provided specific visual evidence regarding the amplified tensile stresses and microstructural changes in the polymer. This demonstration will therefore provide advantageous insights into the development of functional optical materials.

History

Email Address of Submitting Author

maxiang@ecust.edu.cn

Institution

East China University of Science and Technology

Country

China

ORCID For Submitting Author

0000-0002-8679-4491

Declaration of Conflict of Interest

X. M., F. G. and H. T. are inventors on a provisional patent application related to this work that has been filed by the East China University of Science and Technology (Application no. 202110327580.5, date: 26 Mar 2021). The authors declare no other competing interests.

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