Applications of Copolymers Consisting of 2,6-di(9H-carbazol-9-yl)pyridine and 3,6-di(2-thienyl)carbazole Units as Electrodes in Electrochromic Devices
oleh: Chung-Wen Kuo, Jui-Cheng Chang, Yu-Ting Huang, Jeng-Kuei Chang, Li-Ting Lee, Tzi-Yi Wu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2019-04-01 |
Deskripsi
A series of carbazole-based polymers (PdCz, P(dCz2-<i>co</i>-dTC1), P(dCz2-<i>co</i>-dTC2), P(dCz1-<i>co</i>-dTC2), and PdTC) were deposited on indium tin oxide (ITO) conductive electrodes using electrochemical polymerization. The as-prepared P(dCz2-<i>co</i>-dTC2) displayed a high Δ<i>T</i> (57.0%) and multichromic behaviors ranging from yellowish green, greenish gray, gray to purplish gray in different redox states. Five organic electrochromic devices (ECDs) were built using dCz- and dTC-containing homopolymers and copolymers as anodic materials, and poly(3,4-(2,2-dimethylpropylenedioxy)thiophene) (PProdot-Me<sub>2</sub>) as the cathodic material. The P(dCz2-<i>co</i>-dTC2)/PProdot-Me<sub>2</sub> ECD presented remarkable electrochromic behaviors from the bleached to colored states. Moreover, P(dCz2-<i>co</i>-dTC2)/PProdot-Me<sub>2</sub> ECD displayed a high optical contrast (Δ<i>T</i>, 45.8%), short switching time (ca. 0.3 s), high coloration efficiency (528.8 cm<sup>2</sup> C<sup>−1</sup>) at 580 nm, and high redox cycling stability.