Characteristics of Electro-Optic Device Using Conducting Polymers, Polythiophene and Polypyrrole Films

Abstract

Detailed characteristics of electro-optic elements (color switching and memory) utilizing the spectral change of conducting polymers by electrochemical doping and undoping are studied. The response time of color switching, for example, red↔blue in polythiophene film in the electrolyte of LiBF 4 /acetonitrile is 30∼100 msec under the applied voltages of -2.0↔+4.0 V vs. Li plate. More than 10 3 cycles of color switch are observed quite reproducibly. Three color states of yellow green, dark brown and blue are demonstrated for polypyrrole film.