Su Yuh-Shan, Wu Tzi-Yi
Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan.
Polymers (Basel). 2017 Jul 18;9(7):284. doi: 10.3390/polym9070284.
Three carbazole-based conjugated polymers (poly(3,6-di(2-thienyl)carbazole) (PDTC), poly(2,7-bis(carbazol-9-yl)-9,9-spirobifluorene) (PS2CBP), and poly(3,6-bis(-carbazole)--ethylcarbazole) (PCEC)) are synthesized using electrochemical polymerization. The spectroelectrochemical studies indicate that the PDTC, PS2CBP, and PCEC films show reversible electrochromic behaviors in their redox states, and the PS2CBP film shows a distinct color transition with four various colors (gray at 0 V, grayish-green at 1.0 V, moss green at 1.2 V, and foliage green at 1.4 V). The maximum optical contrast of the PS2CBP and PCEC films is 39.83% at 428 nm and 32.41% at 420 nm, respectively, in an ionic liquid solution. Dual-type electrochromic devices (ECDs) that employ PDTC, PS2CBP, or PCEC film as an anodic layer, and PProDOT-Et₂ film as a cathodic layer, were constructed. The as-prepared PCEC/PProDOT-Et₂ ECD shows high optical contrast (38.25% at 586 nm) and high coloration efficiency (369.85 cm² C at 586 nm), and the PS2CBP/PProDOT-Et₂ ECD shows high optical contrast (34.45% at 590 nm), good optical memory, and good long-term cycling stability.
通过电化学聚合合成了三种基于咔唑的共轭聚合物（聚（3,6 - 二（2 - 噻吩基）咔唑）（PDTC）、聚（2,7 - 双（咔唑 - 9 - 基） - 9,9 - 螺二芴）（PS2CBP）和聚（3,6 - 双（ - 咔唑） - 乙基咔唑）（PCEC））。光谱电化学研究表明，PDTC、PS2CBP和PCEC薄膜在其氧化还原状态下表现出可逆的电致变色行为，并且PS2CBP薄膜呈现出具有四种不同颜色的明显颜色转变（0 V时为灰色，1.0 V时为灰绿色，1.2 V时为苔藓绿，1.4 V时为叶绿色）。在离子液体溶液中，PS2CBP和PCEC薄膜的最大光学对比度分别在428 nm处为39.83%和在420 nm处为32.41%。构建了以PDTC、PS2CBP或PCEC薄膜作为阳极层，以PProDOT - Et₂薄膜作为阴极层的双型电致变色器件（ECD）。所制备的PCEC/PProDOT - Et₂ ECD表现出高光学对比度（586 nm处为38.25%）和高显色效率（586 nm处为369.85 cm² C），并且PS2CBP/PProDOT - Et₂ ECD表现出高光学对比度（590 nm处为34.45%）、良好光学记忆和良好的长期循环稳定性。
