A new donor−acceptor−donor monomer chalcogena-diazolobenzotriazole (CDB)−3,4-ethylenedioxythiophene (EDOT) is designed and synthesized with a torsion angle of 39°b etween the donor EDOT and acceptor CDB due to the existence of large steric hindrance between the EDOT and planar CDB structures. The corresponding conjugated polymer film pCDB− EDOT is prepared via electrochemical deposition on indium tin oxide-coated glass, and their electrochromic and capacitive properties are characterized. The polymer film displays a reversible switch from the green of the neutral state to the transparent gray of the oxidation state. Besides, the polymer pCDB−EDOT shows excellent capacitance, with an area specific capacitance of up to 4.65 mF cm −2 at 0.05 mA cm −1 . This is one of the highest area specific capacitance in D−A−D type conjugated materials reported so far. Moreover, the polymer film maintains excellent rate capability and high capacitive stability. The assembled electrochromic supercapacitor device can change the appearance color from dark green (no power) to blue (fully charged), accompanied by outstanding energy storage ability and good cycle stability, which could run a single yellow LED (1.8 V, 0.04 W) for more than 60 s. These results indicate the great potential of polymer pCDB− EDOT in the applications of energy-sustainable intelligent devices.
Revealing the actual origin of the unusual red-shifted aggregation-state emission of triphenylamine-imidazole molecules: is the photochemical reaction rather than the excimers.
The photo-oxidation reaction of 2,4,5-Triphenylimidazole (lophine) and its derivatives has been in-depth studied since its chemiluminescence phenomenon was discovered. It seems to have reached a consensus that the photostability of...
We reported two similar AIEgens obtained by photo-oxidation reaction. They exhibited different luminescence behaviors in aggregation state due to the different stacking manners, especially the distance and overlapping areas between the molecules.
Electrochromic small molecules suffer from the difficult film processibility and serious dissolvability at their oxidation state, which greatly limit their applications in electrochromic areas. Here, well-defined electrochemical polymer structures, pCZ-FSQ and pCZ-FEQ, are obtained by taking advantage of the unique electrochemical dimerization of carbazole, and low redox-potential phenothiazine and phenoxazine groups are introduced as an electrochromic color-changing unit with the interruption of conjugation between them via an alkyl chain linkage. The obtained polymer films pCZ-FSQ and pCZ-FEQ are composed of the independent dimeric carbazole and organic small molecule units. Finally, they exhibit outstanding electrochromic properties with optical contrast of more than 50%, switching time of less than 1 s, excellent stability (over 500 cycles of optical stability), and ultrahigh coloration efficiency (276 cm 2 C −1 for pCZ-FSQ , 384 cm 2 C −1 for pCZ-FEQ). This is thought to be greatly attributed to the well-defined electrochemical polymer structures with dual electrochromic color-changing properties of both phenothiazine/phenoxazine and dimeric carbazole. This can also provide some implications for the future in-depth study of small molecule electrochromism and the solution to the problem of difficult processing of small molecules.
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