New Electrochromic Systems for the Color e-Paper

2010 
Electrochemical materials showing color changes from clear to the three primary colors (RGB) and bistability have been required to realize the full-color electronic paper. To fabricate a multicolor ECD (electrochromic device), we have examined the electrochromic properties of various types of electrochromism from the polymer to low molecular weight organic materials such as viologen derivatives and other derivatives with conventional ITO-sandwich cell. Even though, the polymer electrochromism has shown the progress on primary colors recently [1 ,2 ], it has still problems on the transition speed and whiteness on the transparency. Low molecular weight electrochromic materials show the better processability and color purity for the color E-paper applications until now. Highly reflective blue color was reported by using viologen derivatives but the green and red color materials of high color purity and bistability need to be still developed [3]. Here we describe the new structured electrochromic(EC) materials to improve the three primary colors (RGB) and bistability.
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