Electrochromism in evaporated WO3‐MoO3‐V2O5 films

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Abstract
Symmetric and asymmetric EC cells are here fabricated using amorphous W03‐Mo03‐V205 films vacuum‐evaporated on substrates prepared in electrolyte of lithium perchlorate and propylene carbonate. Dependences of the reflection spectra of symmetric cells and the transmission spectra of asymmetric cells on the applied voltage was investigated. Almost black displays were obtained with W03‐Mo03 films to which negative voltages were applied (the reduced state) and the contrast ratio was improved compared with films of pure W03 and V205. Reddish displays were obtained with W03‐Mo03 films, and V205‐Mo03 films gave yellow and bluish displays. Addition of Mo03 to 60% W03 ‐ 40% V205 composition has improved EC properties, giving colors between brown and yellow‐green. Possible colors obtained are represented in the CIE (x, y) chromaticity diagram.

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