Electrochromic Performance of Single-layered Electrochromic Device Containing Picene Ion Gel
Vol. 57, No. 2, pp. 100-105,
Apr. 2020
10.12772/TSE.2020.57.100
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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.
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