Colour tunable electrochromic devices based on PProDOT-(Hx)2 and PProDOT-(EtHx)2 polymers

摘要: The most commonly used method to tune the colour transition states of an ECD is modify chemical structure electrochromic polymers achieve desired transparent dark state switching colours. However, this approach can present significant synthetic challenges that typically result in a compromise device performance parameters such as contrast range or stability well solvent processability. In study we have investigated tuning dark-state (at +0.8 V) by solution mixing poly(3,3-dihexyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) (PProDOT-(Hx)2), which has excellent but with esthetically undesirable purple transition, poly(3,3-bis(2-ethylhexyl)-3,4-dihydro-2H-thieno [3,4-b][1,4]dioxepine) (PProDOT-(EtHx)2), material poorer more esthetic blue transition. influence mixtures two cathodically colouring materials, PProDOT-(Hx)2 and PProDOT-(EtHx)2, on spectroelectrochemistry assembled ECDs was explored. Photopic contrast, electrochemical properties type ionic liquid electrolyte employed assembly were also determine how be tuned while maintaining over 55%.