Electrochromic Conducting Polymers in Window, Display, and Variable Optical Attenuator Devices (original) (raw)

2007

Abstract

3To achieve high optical contrasts in the visible region, two complimentary electrochromic materials are typically utilized, one cathodically coloring and the other anodically coloring. In dual polymer electrochromic devices, the anodically coloring material has a high bandgap, with the polymer being transmissive in the neutral state and becoming colored upon oxidation. The cathodically coloring polymer has a relatively low bandgap and is colored when neutral and transmissive upon oxidation. An example of this type of device is one in which the anodically coloring polymer is an N-substituted propylenedioxypyrrole, such as PProDOP-NPrS, and the cathodically coloring polymer is a dialkyl-substituted propylenedioxythiophene, such as PProDOT-(CH3)2. The colors exhibited by the device are an additive combination of those exhibited by the individual polymers yielding a high contrast of ca. 70% in the visible region. Absorptive/transmissive devices can also be hybrid-type with one of the e...

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