All-in-one electrochromic device from viologen-based Cu-MOF and photocurable eutectogel

A novel all-in-one electrochromic device from viologen-based Cu-MOF was demonstrated successfully for the first time. The viologen-based Cu-MOF was dispersed in a photochemical eutectic solvent and directly used as an electrochromic material with the outstanding advantage of good modulation ability in a wide range of visible light. The electrochromic device's (ECD) color changed from transparent and light lime green to blue during the change of potential from 0 V to −3.5 V. The bistability of the ECD was demonstrated by the transmittance degradation of less than 10 % over 1.79 h when the power was turned off. This showed that the ECD could maintain its optical state long without a continuous power supply. DescriptionA viologen-based Cu-MOF was employed with photocurable deep eutectic solvent to fabricate successfully all-in-one ECD, which changes from a high transparent lime green color to a blue color with applying −3.5 V. [Display omitted] •First report on the use of viologen-based Cu-MOF and photocurable eutectogel for all-in-one electrochromic device.•Rapid coloration from transparent and light lime green to blue color during change potentials from 0 V to −3.5 V.•The maximum reduction in ΔT at 600 nm reached 71 % under a pulse width of 5 s.•The bistability of the ECD decreased by less than 10 % over 1.79 h when the power was turned off.