ビオロゲン表示素子の発消色機構

抄録

Processes of coloration and bleaching for benzyl viologen (DP-BzBr) were studiedin terms of its electrical and optical properties. The bleaching process is divided into three stages (I-III). It is shown that the bleaching of colored film arises in stages I and II. The time dependence of V_ac (voltage between Pt and SnO₂ electrode) in stage III is due to the diffusion process of condensedviologen dication adjacent to SnO₂ electrode.
Crystallization of colored films was studied by measuring the potential of SnO₂ electrode covered with a colored film and the optical density of the colored film. The colored filmwas observed through a microscope. The changes in potential and optical density on memory state are accompanied with the crystallization of the colored films. The velocity of crystal growth decreases with increasing radius of the anion of the supporting electrolyte, and also by using SnO₂ electrode treated by dimethyldichlorosiran as a display electrode. The crystal growth of the colored film in the case of viologen dimers was not observed.