Abstract
Synchronously switchable electrochromic/electrofluorochromic polymers have captured intense attention in the field of displays and sensors. However, most of the emerged materials could not exhibit satisfactory switching performances, especially the slow response speed. In this work, a novel fluorescent/electroactive polyimide was rationally designed and prepared by introduction of the diphenylamine-pyrene unit. The obtained polyimide showed high solubility, excellent thermostability, fluorescence solvatochromism, and interesting electrochromic (in the vis-NIR region)/electrofluorochromic dual-switching properties. Moreover, due to the loose interchain packing benefiting from bulky pendant diphenylamine-pyrene unit, an impressive switching speed was realized (1.7/0.9 s for EC and 2.8/0.9 s for EFC processes), which will greatly promote the real-life applications in the future.
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