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Issue 43, 2018
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Tunable green electrochromic polymers via direct arylation polymerization

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Abstract

A method to tune the hues of neutral green conjugated electrochromic polymers (NG-ECP) via direct C–H arylation polymerization (DArP) was developed. We used 4,7-dibromo-2,1,3-benzothidiazole and 2,7-dibromofluorene to randomly copolymerize with ProDOT via DArP and successfully obtained a series of green polymers. On varying the ratio of 4,7-dibromo-2,1,3-benzothidiazole and 2,7-dibromofluorene, we can readily adjust the relative intensity of two absorption bands in the visible-light wavelength region, which leads to four green polymers with different hues being obtained. Specifically, increasing the ratio of 4,7-dibromo-2,1,3-benzothidiazole leads to the enhancement of the polymer absorption intensity in the long wavelength (∼550–700 nm) region, while increasing the ratio of 2,7-dibromofluorene will lead to the increase of the polymer absorption intensity in the short wavelength (∼400–500 nm) region. Via the random direct arylation polymerization of multi-component monomers in various ratios, we can precisely control the absorption spectra of neutral green conjugated electrochromic polymers (NG-ECPs) in the visible-light wavelength region. The electrochemical and optical properties, spectroelectrochemical behaviors, and electrochromic performance of these NG-ECPs were characterized and they showed great potential for electrochromic devices such as smart windows and transmissive displays.

Graphical abstract: Tunable green electrochromic polymers via direct arylation polymerization

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Supplementary files

Article information


Submitted
26 Jul 2018
Accepted
21 Sep 2018
First published
01 Oct 2018

Polym. Chem., 2018,9, 5262-5267
Article type
Paper

Tunable green electrochromic polymers via direct arylation polymerization

L. You, J. He and J. Mei, Polym. Chem., 2018, 9, 5262
DOI: 10.1039/C8PY01105B

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