title: Visualization of energy: light dose indicator based on electrochromic gyroid nano-materials.
abstract: The typical applications of electrochromic devices do not make use of the charge-dependent, gradual optical response due to their slow voltage-sensitive coloration. However, in this paper we present a design for a reusable, self-powered light dose indicator consisting of a solar cell and a gyroid-structured nickel oxide (NiO) electrochromic display that measures the cumulative charge per se, making use of the efficient voltage-sensitive coloration of gyroid materials. To circumvent the stability issues associated with the standard aqueous electrolyte that is typically accompanied by water splitting and gas evolution, we investigate a novel nano-gyroid NiO electrochromic device based on organic solvents of 1,1,1,3,3,3-hexafluoropropan-2-ol, and room temperature ionic liquid (RTIL) triethylsulfonium bis(trifluoromethylsulfonyl) imide ([SET3][TFSI]) containing lithium bis(trifluoromethylsulfonyl) imide. We show that an effective light dose indicator can be enabled by nano-gyroid NiO with RTIL; this proves to be a reliable device since it does not involve solvent degradation or gas generation.
authors.affiliation: Nokia R&D UK, Broers Building, 21 JJ Thomson Avenue, Madingley Road, CB3 0FA, Cambridge, UK.
authors.forename: Di
authors.initials: D
authors.lastname: Wei
authors.forename: Maik R J
authors.initials: MR
authors.lastname: Scherer
authors.forename: Michael
authors.initials: M
authors.lastname: Astley
authors.forename: Ullrich
authors.initials: U
authors.lastname: Steiner