Cathodic electrochromism of lutetium diphthalocyanine films on insulating substrates was investigated by a moving‐boundary technique. Reduction occurred by injection of electrons from a gold contact and cations from a liquid electrolyte. Light blue products formed with aqueous or organic solutions of alkali metal salts, while a dark violet product formed with aqueous hydrochloric acid. The dark material had a charge‐carrier mobility of 8 × 10 − 7 cm 2 / Vsec and an estimated bulk resistivity of 1800 Ω‐cm. Reduced forms of the dye appear to be solid cation conductors.
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Nicholson et al. (1981) studied this question.