Electrochromic properties of the V2O5 thin films prepared from a spinnable organic vanadium solution were investigated. The films heat-treated at 400 °C showed clear two-step electrochromism, deep blue⇄green⇄yellow, with its response time for obtaining ΔOD=0.5 being ∼2 s. The yellow and green colors showed good memory effects for more than 20 h, while the blue one was considerably degraded within 10 h.
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Nagase et al. (1992) studied this question.
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