Realizing Photoswitchable Mechanoluminescence in Organic Crystals Based on Photochromism

Author:

Xie Zongliang12,Zhang Xiayu3,Xiao Yuxin1,Wang Hailan1,Shen Mingyao1,Zhang Simin1,Sun Haodong1,Huang Rongjuan1,Yu Tao12,Huang Wei145ORCID

Affiliation:

1. Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics & Xi'an Institute of Biomedical Materials and Engineering Northwestern Polytechnical University 127 West Youyi Road Xi'an 710072 China

2. Key laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical University 218 Qingyi Road Ningbo 315103 China

3. Department of Science and Environmental Studies The Education University of Hong Kong 10 Lo Ping Road, Tai Po, New Territories Hong Kong P. R. China

4. Key Laboratory of Flexible Electronics & Institute of Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China

5. State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing 210023 China

Abstract

AbstractOrganic mechanoluminescent (ML) materials possessing photophysical properties that are sensitive to multiple external stimuli have shown great potential in many fields, including optic and sensing. Particularly, the photoswitchable ML property for these materials is fundamental to their applications but remains a formidable challenge. Herein, photoswitchable ML is successfully realized by endowing reversible photochromic properties to an ML molecule, namely 2‐(1,2,2‐triphenylvinyl) fluoropyridine (o‐TPF). o‐TPF shows both high‐contrast photochromism with a distinct color change from white to purplish red, as well as bright blue ML (λML = 453 nm). The ML property can be repeatedly switched between ON and OFF states under alternate UV and visible light irradiation. Impressively, the photoswitchable ML is of high stability and repeatability. The ML can be reversibly switched on and off by conducting alternate UV and visible light irradiation in cycles under ambient conditions. Experimental results and theoretical calculations reveal that the change of dipole moment of o‐TPF during the photochromic process is responsible for the photoswitchable ML. These results outline a fundamental strategy to achieve for the control of organic ML and pave the way to the development of expanded smart luminescent materials and their applications.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

China Postdoctoral Science Foundation

Natural Science Basic Research Program of Shaanxi Province

Natural Science Foundation of Ningbo

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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