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Selective electrochromic (EC) switching in the wide range from visible (VIS) to near-infra-red (NIR) wavelengths was achieved using novel triple-redox-active metallosupramolecular polymers (MSPs), synthesized by 1:1 complexation of a transition metal salt and a bisterpyridine ligand containing a tetraphenylbenzidine (TPB) moiety. By tuning an oxidation potential in the range between 0 V and 1.2 V vs. Ag/Ag+, the MSPs (polyFeLTPB and polyRuLTPB) were capable of selective and reversible triple-band EC modulation in the visible (400–750 nm), NIR-I (750–1000 nm), and NIR-II (1000–1600 nm) regions. Interestingly, the polymers exhibited excellent EC properties with remarkably high optical contrast (98%), high coloration efficiency (CE) (851 cm2/C), and fast switching even in the NIR region. A made-to-order quasi-solidstate EC device exhibited exceptionally long cycle stability (>7000 cycles) from the visible to the NIR region at an incredibly low operational voltage (1.2 V). These two ECDs demonstrated that a significant amount of solar irradiance (about 33–36%) shielding in the NIR band at 750–1670 nm while allowing 46–53% of VIS transparency under low voltage. At dark mode at 0.8 V, they exhibit 59–63% of VIS and 45–47 % NIR blocking. Under full oxidation, ECDs screen 51–60% VIS and 36–41% NIR while using very small electrical energy (about 1.7–13.5 mJ cm–2). These findings signify a significant advancement in the design of large scalable dual-band EC devices.

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  This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Optical Materials, copyright © 2024 American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acsaom.4c00108.

Keyword: VIS–NIR, dual-band electrochromic, multicolor, metallosupramolecular polymer, triple redox, durability, smart windows

Date published: 2024-06-28

Publisher: American Chemical Society (ACS)

Journal:

• ACS Applied Optical Materials (ISSN: 27719855) vol. 2 issue. 6 p. 1117-1127

Funding:

• JST-Mirai Program JPMJMI21I4
• Environmental Restoration and Conservation Agency JPMEERF20221M02

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5058

First published URL: https://doi.org/10.1021/acsaom.4c00108

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Updated at: 2024-11-29 16:31:55 +0900

Published on MDR: 2024-11-29 16:31:55 +0900