AUTHOR=Jin Shiqi , Zhang Xuejian , Guo Xu , Zhu Mimi , Liu Ping 

TITLE=The Flexible Electrochromic Device That Turns Blue Under Both Positive and Negative Application Voltages

JOURNAL=Frontiers in Nanotechnology

VOLUME=Volume 4 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/nanotechnology/articles/10.3389/fnano.2022.887442

DOI=10.3389/fnano.2022.887442

ISSN=2673-3013

ABSTRACT=Using the photocurable electrolyte solution containing viologen derivative 1,1′-bis- (4-vinylbenzyl)-4,4′-bipyridinium dihexafluorophosphate (EV2+•2PF6-) and its composite of EV2+•2PF6-and triphenylamine derivative N,N′-di(4-((3-(triethoxysilyl)- propyl)imino)methyl)phenyl-N,N′-diphenyl-4,4′-biphenyldiamine (TPB-PSSO)  as the electrochromic active layer, respectively, the flexible electrochromic devices (FECDs) were prepared by photocurable technology. The device structure was PET-ITO/ photocurable electrolyte solution/PET-ITO. The electrochromic properties of FECDs were investigated. The results show that the FECDs can all undergo reversible color change, especially the PET-ITO/photocurable electrolyte solution-composite/PET-ITO can undergo polychromatic transition. The FECD based on EV2+•2PF6- can reversibly change between colorless transparent and blue, and the FECD based on composite of TPB-PSSO-EV2+•2PF6- can reversibly change between black blue, light yellow and sky blue.