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http://dx.doi.org/10.12772/TSE.2020.57.100

Electrochromic Performance of Single-layered Electrochromic Device Containing Picene Ion Gel  

Kim, Namhyeon (Department of Organic Material Science and Engineering, Pusan National University)
Park, Jong S. (Department of Organic Material Science and Engineering, Pusan National University)
Publication Information
Textile Science and Engineering / v.57, no.2, 2020 , pp. 100-105 More about this Journal
Abstract
Electrochromism is a phenomenon in which the color of an electroactive material changes when a voltage is applied. Polyaromatic hydrocarbons (PAHs) are colorless in the neutral state owing to their broad bandgap; however, under the applied voltage, they exhibit various colors during oxidation or reduction owing to the molecular plasma resonance phenomena. Among PAH materials, picene is an intriguing material, which has not been employed as an electrochromic material because of its high stability with a bandgap of more than 3 eV. In this study, the electrochromic performance of a picene-containing ion gel consisting of poly(vinylidene-co-hexafluoropropylene) and imidazole-based ionic liquid (IL) was investigated. In an electrochromic device (ECD) fabricated on indium tin oxide (ITO) glass, the picene ECD was colorless in the neutral state; in the oxidation and reduction states, it showed reversible changes to yellow with an absorption peak at 520 nm. As the IL content increased, the bandgap decreased, and the switching behavior improved slightly. To further enhance the electrochromic performance, silver nanowires (AgNWs) were applied to the ITO electrodes. Compared with pristine ITO, the AgNW-based electrode exhibited significant improvement in optical contrast. Silver fabrics were used to produce highly flexible textile-based ECDs, which showed vivid and reversible electrochromic transitions under an applied voltage.
Keywords
electrochromism; picene; polyaromatic hydrocarbon; electrochromic device; ion gel;
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