Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.eurpolymj.2013.02.026
Title: Solution-processable multicolored dithienothiophene-based conjugated polymers for electrochromic applications
Authors: Neo, W.T.
Cho, C.M.
Song, J.
Chin, J.M.
Wang, X.
He, C. 
Chan, H.S.O. 
Xu, J.
Keywords: Conjugated polymer
Device
Dithienothiophene
Electrochromic
Near-infrared
Issue Date: Sep-2013
Source: Neo, W.T., Cho, C.M., Song, J., Chin, J.M., Wang, X., He, C., Chan, H.S.O., Xu, J. (2013-09). Solution-processable multicolored dithienothiophene-based conjugated polymers for electrochromic applications. European Polymer Journal 49 (9) : 2446-2456. ScholarBank@NUS Repository. https://doi.org/10.1016/j.eurpolymj.2013.02.026
Abstract: The syntheses of conjugated polymers poly(2,6-(dithieno[3,2-b:2′, 3′-d]thiophenyl)-alt-2,5-(3,4-dialkoxy)thiophenyl) were achieved by reacting 2,6-dibromodithieno[3,2-b:2′,3′-d]thiophene with respective 2,5-bis(trimethyltin)-3,4-dialkoxythiophene in medium yields via a Stille coupling reaction. The resulting polymers are highly soluble in some common organic solvents. The polymer films are purple at neutral states and gradually become gray upon progressive oxidation by applying an external potential as a result of absorption across the whole visible spectrum. At the fully oxidized state, the polymers become transmissive light blue. In particular, polymer poly(2,6-(dithieno[3,2-b:2′,3′-d]thiophenyl)-alt-2,5-(3, 4-didecyloxy)thiophenyl) (P1) film exhibits exceptional high optical contrasts of 46% and 72% in the visible and near-infrared regions, respectively, with good stability over 800 full cycles. An absorptive-transmissive electrochromic device (ECD) of P1 exhibits a contrast ratio of 15% at λmax of 534 nm and 20% at 1321 nm and high coloration efficiency of 449 and 471 cm 2/C, respectively. This type of multichromic polymers would thus be promising materials for electrochromic displays and inks. © 2013 Elsevier Ltd. All rights reserved.
Source Title: European Polymer Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/86718
ISSN: 00143057
DOI: 10.1016/j.eurpolymj.2013.02.026
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