Organic electrochromism for a new color electronic paper

We studied electrochemical properties of terephthalate derivatives, which showed reversible color change from clear to three primary colors by electrochemical stimuli, towards paper-like electronic imaging device. To improve the repetitive stability of the electrochromic cell, ferrocene was added to the electrolyte solution as electron donor (counter redox material). Passive-matrix operation (8×8) of electrochromic display (ECD) has been demonstrated. Moreover, a prototype three-layered ECD, which consisted of cyan, magenta and yellow primary-color layers, was also demonstrated to clarify the potential for full-color electronic paper.