This is a copy of the slides presented at the meeting but not formally written up for the volume.

Electrochromic and electrofluorescent cell was fabricated by the combination of electrochromic (EC) viologen and a fluorescent anthracene polymer. All-solid-state dual electrochromic windows which have color transition from yellow to dark blue were assembled by employing benzyl viologen, photo polymerizable electrolyte and polyanthracene (PAN). EC contrast and response of ECDs adopting the viologen and PAN could be optimized by changing the content of PAN. In the optimized condition, EC-EF device showed optical contrast and fluorescence switching with response time less than 5 sec.