Optoelectronic/memory storage properties of triphenylamine-based dual-function electrochromic materials

Two electrochromic polymers containing triphenylamine groups with memory storage function were synthesized. The structures of the polymers have been characterized in detail. The polymers had good solubilities, excellent thermal stabilities and high fluorescence intensities. The reversible redox peak can also be clearly observed in the cyclic voltammogram, and the electrochromic color contrast was obvious. In addition, the polymers can also be used as memory storage materials with excellent "write-read-erase-rewrite" performance. Among them, the P2 film presented noticeable color changed from light yellow to pine green during the voltage 0 V-1.4 V, the coloring time was 3.3 s and the bleaching time was 3.7 s, the coloration efficiency was 207 cm(2) C-1. The ON/OFF current ratio of P2 was 10(3.1) and the threshold voltage of P2 was 0.91 V. The results showed that these polymers have broad application prospects in the field of dual-function materials.