Fast electrochromic polymers based on new poly(3,4-alkylenedioxythiophene) derivatives

摘要

A series of new poly(3,4-alkylenedioxythiophene)swere electrosynthesized using 3,4-alkylenedioxythiophenederivative monomers where either the size of the alkylenedioxyring, or the nature of the pendant group, was varied.Optoelectrochemical experiments revealed that electronic bandgaps for all polymers are approximately 1.7 eV(730 nm). Thesecathodically coloring polymers switch from a relativelytransmissive light green in the oxidized form to an opaque darkblue in the reduced form. Multiple switching studies, monitoringthe electrochromic contrast, showed that Ca. 300 mm thickpolymer films could be fully switched between their reduced andoxidized forms in 0.8-2.2 5 with A%T of 44-63%. In situconductivity studies carried out on relatively thick polymer films(2.7-9.5 ~m) deposited between large gap (200 mm) lateral growthelectrodes demonstrated the low potential turn on for thesematerials and relative maximum conductivities of 0.2-12.1 S/cm were affained.