Ikue Kawashima

A photon-mode full-color rewritable image using photochromic compounds

A photon-mode full-color rewritable image has been demonstrated. Three types of photochromic fulgides having yellow, magenta, and cyan color were used as rewritable dyes. Photochromic fulgides were mixed and coated on a white polyethylene terephthalate film. Upon irradiation with three (red, green, and blue) visible light beams, a wide hue extent, a high white reflectance of over 80%, and a high contrast ratio of over 45:1 were attained. A full-color image retains its colors for over 1 hour under standard-office-brightness conditions (700 Ix). The photochemical coloration-decoloration cycles could be repeated over 100 times without substantial losses.

20.4: Photon-Mode Full-Color Rewritable Image Using Photochromic Compounds

Photon-mode full-color rewritable image has been demonstrated. Three kinds of photochromic fulgides were used as rewritable dyes. Photochromic fulgides and polystyrene were mixed and coated on a white polyethylene terephthalate film. On irradiation with three (red, green, and blue) visible light beams, wide hue extent, high white reflectance over 80 %, and high contrast ratio over 45 were attained. A full-color image keeps their colors over an hour under the standard office brightness (700 lx) without substantial fatigues. The photochemical coloration-decoloration cycles could be repeated over 100 times.