High-performance blue fluorescent/electroactive polyamide bearing p-phenylenediamine and asymmetrical SBF/TPA-based units for electrochromic and electrofluorochromic multifunctional applicationsElectronic supplementary information (ESI) available. See DOI: 10.1039/c9tc00326f

• Main Authors: Su, Kaixin, Sun, Ningwei, Tian, Xuzhou, Guo, Shuang, Yan, Zhihua, Wang, Daming, Zhou, Hongwei, Zhao, Xiaogang, Chen, Chunhai
• Format: Article
• Language: English
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c9tc00326f

Electrofluorochromic (EFC) materials with excellent comprehensive properties possess promising application prospects in optoelectronic and biological fields. Here, a novel high-performance polyamide (SBF-HPA) has been realized by bearing stably electroactive p -phenylenediamine and asymmetrical spirobifluorene/triphenylamine-based groups to reduce the π-π stacking of polymer chains. The resulting polyamide showed high fluorescence with a quantum yield of up to 69.7% and 14.3% for its NMP dilute solution and solid-film states, respectively. The CV curves revealed two redox couples accompanied with two stages of color change (near colorless-green-blue). Furthermore, the blue fluorescent/electroactive polyamide film exhibited excellent electrochemical stability, high fluorescence/color contrast, fast switching speed and superior EC/EFC cycling stability, facilitating real-life applications in the near future. A novel EC/EFC polyamide is realized by introducing stably electroactive p -phenylenediamine and asymmetrical SBF/TPA-based unit to reduce packing.