Inorganic all-solid-state electrochromic devices with reversible color change between yellow-green and emerald green

All-solid-state electrochromic devices with the structure of glass/ITO/WO3/Ta2O5/Li/V2O5/ITO were prepared by an evaporation method. Because of the use of a V2O5 complementary layer, the ECD can achieve obvious color change between yellow-green and emerald green with superior cycling performance up to 5000 cycles, indicating the great potential in smart window applications.