Journal of Industrial and Engineering Chemistry, Vol.80, 93-97, December, 2019
Synthesis and electrochromic properties of a carbazole and diketopyrrolopyrrole-based small molecule semiconductor
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Carbazoles are excellent chromophores for electrochromic (EC) applications owing to their exceptional oxidation properties. Herein, we synthesized a donor-acceptor-type small molecule semiconductor, named LGC-D023, containing carbazole as a core donor, diketopyrrolopyrrole as a weak-acceptor π-linker, and 3-octylrhodanine as an electron-acceptor end-unit; and characterized its optical, thermal, and EC properties. LGC-D023 exhibited good organic solvent solubility, as well as distinct melting and crystallization transitions above 200 °C. Spectroelectrochemical spectra showed blue (L*: 88.28, a*: -6.56, b*: -1.29)-to-red (L*: 93.61, a*: 2.94, b*: -0.75) color switching with a high optical contrast (35.3%), fast response time (>0.3 s), and desirable coloration efficiency (91.9 cm2/C). These results confirmed that this donor-acceptor small molecule could be a new promising candidate for an EC material.
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