Tailoring the optical properties of metal-oxide electrochromic mixtures
Abstract
A
semi-empirical approach is given to show how an optical-shift parameter S (ia the frequency maximum of
an optical band) correlates with the composition of a mixture of electrochromic oxides such as tungsten
trioxide, thereby allowing the colours of electrochromic oxide mixtures to be tailored. It is shown that changing the relative amounts of charge-donating oxygen-based moieties (oxide, pendant oxygen and bridging oxygen) in the mixture systematically varies the electrochromic colour according
to ‘shifting
constants’
σ, which depend on the identities of both dopant and host oxides.