期刊
COATINGS
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/coatings12050646
关键词
electrochromic polymer; 3; 4-ethylenedioxythiophene; transmittance change; response time; colorful-to-colorless switching; flexible electrochromic device
资金
- Ministry of Science and Technology of the Republic of China [110-2221-E-992-051, 108-2221-E-224-049-MY3]
In this study, electrochromic devices were prepared using polymers containing DCB and ED derivatives, and their performances were investigated. The P(2DCB-co-ED)/PEDOT-PSS flexible device showed high Delta T and good stability, while the P(DCB-co-EDm)/PEDOT-PSS device exhibited high Delta T and a short response time.
A 1,4-bis((9H-carbazol-9-yl)methyl)benzene (DCB)-containing homopolymer (P(DCB)) and four DCB- and ED-derivative (3,4-ethylenedioxythiophene (EDOT) and 3,4-ethylenedioxythiophene-methanol (EDm))-containing copolymers (P(DCB-co-ED), P(2DCB-co-ED), P(DCB-co-EDm), and P(2DCB-co-EDm)) were electropolymerized on ITO-polyethylene terephthalate (PET) substrates and their electrochromic performances were studied. DCB displays a lower E-onset than that of EDOT and EDm, conjecturing that the biscarbazole-containing DCB group shows a stronger electron-donating property than that of the ED derivatives. The P(2DCB-co-ED) film presents slate grey, dark khaki, and dark olive green at 0.0, 1.0, and 1.2 V. Bleaching-to-coloring switching studies of polymers show that P(2DCB-co-EDm) shows a high Delta T (31.0% at 725 nm) in solutions. Five dual-layer flexible electrochromic devices (ECDs) based on P(DCB), P(DCB-co-ED), P(2DCB-co-ED), P(DCB-co-EDm), and P(2DCB-co-EDm) as the anodic materials and PEDOT-PSS as the cathodic material are constructed. The P(2DCB-co-ED)/PEDOT-PSS flexible ECD shows a high Delta T (40.3% at 690 nm) and long-term electrochemical cycling stability, while the P(DCB-co-EDm)/PEDOT-PSS ECD shows a high Delta T (39.1% at 640 nm) and short response time (<= 1.5 s). These findings offer us a new structural insight for the valuable design of conjugated polymers in high-contrast, flexible ECDs.
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