Multicolored electrochromic and electrofluorochromic materials containing triphenylamine and benzoates

Abstract

Multicolored electrochromic and electrofluorochromic materials containing triphenylamine and benzoates were developed.

Redox‐Active Hydrocarbons: Isolation and Structural Determination of Cationic States toward Advanced Response Systems

“…Especially, the number of redox states of organic molecules is directly related to the functionality of specific organic electronic devices, for example, corresponding to the molecular theoretical capacity in organic batteries, the multi-color responsivity in electrochromic materials and a single bit of information in molecular memory devices. [47,[124][125][126][127] Therefore, the findings on the precise control of the intrinsic properties of organic molecules based on the manipulation of multiple redox states may lead to breakthroughs in the field of organic bulk electronic materials. Very recently, other attractive systems have also been reported in which both neutral and cationic states were successfully isolated by applying the strategies described here.…”

“…Elucidation of the redox properties of pure hydrocarbons should provide important insights for the construction of organic electronic devices. Especially, the number of redox states of organic molecules is directly related to the functionality of specific organic electronic devices, for example, corresponding to the molecular theoretical capacity in organic batteries, the multi‐color responsivity in electrochromic materials and a single bit of information in molecular memory devices [47,124–127] . Therefore, the findings on the precise control of the intrinsic properties of organic molecules based on the manipulation of multiple redox states may lead to breakthroughs in the field of organic bulk electronic materials.…”

High-Performance Electrochromic Covalent Hybrid Framework Membranes via a Facile One-Pot Synthesis

“…Due to the redox activity of TPA, an anodic peak at 1.15 V and a cathodic peak at −0.15 V are observed during the CV test with the voltage between −0.8 and 2 V. − When increasing the scan rate from 25 to 250 mV/s, the PPTA hybrid framework membrane shows a capacitive process evidenced by the good linear relation between the current density and the scan rate (Figure b), which indicates that the electrochemical process of this electrochromic system is a non-diffusion controlled process. , To investigate the color switching performance of the PPTA membrane, the spectroelectrochemical spectra, namely the absorption change in response to the external potential, were recorded in a supported electrolyte of 0.1 M LiClO 4 /PC. As shown in Figure c, with the increasing applied potential ranging from −1 to 1 V, a peak at around 670 nm arises, attributed to the formation of nitroxide radical cations during the anodic oxidation process. − The PPTA covalent hybrid framework membrane presents a high transmittance contrast of 79.8%@668 nm (Figure d), which is higher than the transmittance contrasts of most of the reported porous electrochromic materials. ,− The coloration and bleaching times (the time achieving 90% of the transmittance changes) of the membrane are 1.8 and 3.3 s, respectively (Figure e). The high optical contrast and fast switching times are due to the high surface area and porous structure of the covalent hybrid framework membrane .…”

Electrochromic properties of pyrene conductive polymers modified by chemical polymerization

“…In order to more directly explore the switching response time and coloring efficiency of the synthesized polymers, we compared them with the existing literature on thiophene polymers, triphenylamine polymers, EDOT polymers and pyrene polymers. [51][52][53][54] Through comparison, the ve polymers had shorter switching response time and higher coloring efficiency. In summary, all the synthesized polymers have stable electrochromic properties and high coloring efficiency, and they are excellent electrochromic materials.…”