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Authors
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Sun, N. ; Su, K. X. ; Zhou, Z. ; Wang, D.M. ; Fery, A. ; Lissel, F. ; Zhao, X. G. ; Chen, C. H.
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Title
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"Colorless-to-Black" Electrochromic and AIE-active polyamides: An effective strategy for the highest-contrast electrofluorochromism
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Date
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05.11.2020
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Abstract
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Electrofluorochromic (EFC) materials have gained extensive attention owing to their interesting modulations of fluorescence by an electric stimulus. However, the limited performances, especially the low fluorescence on/off contrast, significantly hampered their further applications. Herein, we design a new strategy to achieve high-contrast electrofluorochromism by combinations of “colorless-to-black” electrochromism and highly fluorescent AIE activity. Given the effective fluorescence quenching effect and high solid-state fluorescence, a fluorescence contrast of 838 is realized, to the best of our knowledge, the highest reported so far. Furthermore, to explore the structure–property relationships, we also separated the E/Z isomers of tetraphenylethylene (TPE) and studied the properties of the three electroactive/fluorescent polymers (11TPE-PA, E-12TPE-PA, and Z-12TPE-PA) derived from different TPE derivatives and isomers. The three branches of polymers all exhibited AIE-active and “colorless-to-black” electrochromic (EC) properties. In addition to the ultrahigh fluorescence contrast, Z-12TPE-PA also integrated high electrochromic contrast (·% T = 92%), short response time (0.6 s/0.3 s), and excellent switching stability (300 cycles), paving the way for the applications in various electronic applications. The study will provide novel insights into the future design and development of high-performance EC/EFC materials.
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Journal
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Macromolecules 53 (2020) 10117-10127
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DOI
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https://doi.org/10.1021/ACS.MACROMOL.0C01019
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