Thermally Activated Photochromism: Realizing Temperature‐Gated Triphenylethylene Photochromic Materials

Author:

Xiao Yuxin1,Shen Mingyao1,Li Jiahui1,Wang Hailan1,Sun Haodong1,He Yunfei1,Huang Rongjuan12,Yu Tao12,Huang Wei134ORCID

Affiliation:

1. Frontiers Science Center for Flexible Electronics (FSCFE) Xi'an Institute of Flexible Electronics (IFE) 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. Key Laboratory of Flexible Electronics & Institute of Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China

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

Abstract

AbstractPhotochromic materials have drawn enormous attention for their potential applications in optical memory storage and photoswitchable molecular devices. Although great achievements for photochromic materials have been fulfilled, it is still a big challenge to realize gated photochromism for ready tunable photochromic properties. In previous studies, rare examples of gated photochromism are reported. Herein, three triarylethylene derivatives FTrPE‐oI, ClTrPE‐oI and BrTrPE‐oI with reversible thermally activated photochromic characteristics are designed and synthesized, whose crystalline powders show no photochromism until thermally activated treatments to relative temperature. Temperature acts as a gate to switch the photochromic properties by switching the aggregation state from crystalline to melted amorphous. With this progress, a broader structural realm becomes accessible for gated photochromic materials, which can now be synthetically tailored for advanced future applications, e.g., in research on gated molecular machines and switches, in studies of photoisomerization mechanisms, or in the generation of thermal tracing materials. To showcase the potential of these distinct thermally activated photochromic materials, their applications in encrypted thermal printing, thermal trace monitoring as well as multi‐level anticounterfeiting are demonstrated, in addition to a comprehensive photochemical study of all compounds.

Funder

Fundamental Research Funds for the Central Universities

Natural Science Basic Research Program of Shaanxi Province

Natural Science Foundation of Ningbo Municipality

Publisher

Wiley

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