Designed, Flexible Electrochromic Display Device with Fe(II)-Based Metallo-Supramolecular Polymer Using Mechanically Etched ITO Film

Electrochromic (EC) displays are expected as energy-saving smart windows or digital signages because of the memory property. We succeeded in developing a designed and flexible electrochromic (EC) display device with Fe(II)-based metallo-supramolecular polymer (polyFe) using a mechanically etched ITO film. Mechanical etching an ITO film was performed with a cutting machine having a blade of which length was adjusted so as not to cut off the film. The fabricated EC device was composed of the etched ITO film, a polyFe layer, an electrolyte layer, a nickel hexacyanoferrate layer as the counter material, and another ITO film. The EC device showed unique changes of the display upon applying a voltage of 1.5 V between the two ITO electrodes. It was revealed that the EC changes were controlled by the etching pattern such as a closed circle or the formation of a narrow ITO path.

Automated summary

This study successfully developed a designed and flexible electrochromic display device with memory property, which can be used as energy-saving smart windows or digital signages. The display changes were controlled by the etching pattern using mechanical etching technique.