Figure 5
CIE 1976 color diagram of the Blending-A electrochromic device (ECD; coated area: 25 mm × 20 mm; thickness: 1 μm; containing 0.5 mg heptyl viologen (HV) as a cathodic electrochromic material (ECM)) in propylene carbonate with 3 wt% LiBF4 as the supporting electrolyte at an applied potential of 1.5 V for 20 s.
