Fast-Switching Vis-IR Electrochromic Covalent Organic Frameworks.

ABSTRACT: Electrochromic coatings are promising for applications in smart windows or energy-efficient optical displays. However, classical inorganic electrochromic materials such as WO₃ suffer from low coloration efficiency and slow switching speed. We have developed highly efficient and fast-switching electrochromic thin films based on fully organic, porous covalent organic frameworks (COFs). The low band gap COFs have strong vis-NIR absorption bands in the neutral state, which shift significantly upon electrochemical oxidation. Fully reversible absorption changes by close to 3 OD can be triggered at low operating voltages and low charge per unit area. Our champion material reaches an electrochromic coloration efficiency of 858 cm² C^-1 at 880 nm and retains >95% of

SUBMITTER: Bessinger D 

PROVIDER: S-EPMC8154512 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature