RGB-to-black multicolor electrochromic devices enabled with viologen functionalized polyhedral oligomeric silsesquioxanes
- Authors
- Pande, G.K.; Heo, J.S.; Choi, J.H.; Eom, Y.S.; Kim, J.; Park, Sung Kyu; Park, J.S.
- Issue Date
- 15-Sep-2021
- Publisher
- Elsevier B.V.
- Keywords
- Electrochromic device; Multi-stacked; Multicolor coverage; Polyhedral oligomeric silsesquioxane; RGB-to-black; Viologen
- Citation
- Chemical Engineering Journal, v.420
- Journal Title
- Chemical Engineering Journal
- Volume
- 420
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/47744
- DOI
- 10.1016/j.cej.2021.130446
- ISSN
- 1385-8947
1873-3212
- Abstract
- Here we demonstrate multicolor electrochromic transitions of viologen functionalized polyhedral oligomeric silsesquioxanes (POSS-viologens). Highly efficient RGB coverage, including black, was successfully achieved with POSS-viologen employed multi-stacked electrochromic devices (ECDs). We prepared octa-viologen functionalized POSS (OHV-POSS) with the insertion of thiophene (OTxHV-POSS) and phenyl (OPhHV-POSS) moiety. The single-layer ion gel ECDs exhibited outstanding electrochromic performances. OTxHV-POSS and OHV-POSS showed red (R) and blue (B) transitions, respectively, with high transmittance changes and superb coloration efficiency. Saturated green (G) was also obtained from the mixture of OPhHV-POSS and OHV-POSS. Furthermore, multi-stacked ECDs were implemented by combining the RGB coloration layers with multiple electrodes. The two-layer ECDs generated intermediate colors, which was fully translated into the color mixing theory. The three-layer device created real black with blackness L∗ of 6.99, covering 12.9% of the NTSC color gamut. The unprecedented RGB-to-black multicolor coverage, not reported elsewhere, is attributable to the reversible color-switching at a low redox potential for extended cyclic operations. Current findings imply that carefully designed POSS-viologens offer a universal route to high-performance and stable multicolor ECDs, offering compatibility with various pixelized color-changing displays and smart windows. © 2021 Elsevier B.V.
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