High contrast ratio and fast-switching dual polymer electrochromic devices
- Univ. of Florida, Gainesville, FL (United States)
A series of dual polymer electrochromic devices (ECDs) based on 12 complementary pairs of conducting polymer films have been constructed using 3,4-ethylenedioxythiophene-containing conducting polymers. Poly[3,6-bis(2-(3,4-ethylenedioxythiophene))-N-methylcarbazole] (PBEDOT-NCH{sub 3}Cz), poly[3,6-bis(2-(3,4-ethylenedioxythiophene))-N-eicosylcarbazole] (PBEDOT-NC{sub 20}H{sub 41}Cz), and poly[4,4{prime}-bis(2-(3,4-ethylenedioxythiophene))biphenyl] (PBEDOT-BP) were utilized as anodically coloring polymers that electrochemically switch between an oxidized deep blue absorptive state and a transmissive (orange or yellow) reduced state. Poly(3,4-ethylenedioxythiophene)(PEDOT) and its alkyl derivatives (PEDOT-C{sub 14}H{sub 29} and PEDOT-C{sub 16}H{sub 33}) have been used as high-contrast cathodically coloring polymers that switch between a deep blue absorptive state in the reduced form and a sky blue, highly transmissive state in the oxidized form. The dual polymer ECDs were constructed by separating complementary pairs of EC polymer films, deposited on ITO glass, with a gel electrolyte composed of a lithium salt and plasticized poly(methyl methacrylate) (PMMA). Device contrast ratios, measured as {Delta}%T, ranged from 27% to 63%, and subsecond switching times for full color change were achieved. These devices were found to exhibit extremely high coloration efficiencies of up to 1400 cm{sup 2}/C over narrow (ca. 100 nm) wavelength ranges and to retain up to 60% of their optical response after 10,000 deep, double potential steps, rendering them useful for EC applications.
- OSTI ID:
- 655350
- Journal Information:
- Chemistry of Materials, Vol. 10, Issue 8; Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photostability of Ambient-Processed, Conjugated Polymer Electrochromic Devices Encapsulated by Bioderived Barrier Films
Modifying the organic/electrode interface in Organic Solar Cells (OSCs) and improving the efficiency of solution-processed phosphorescent Organic Light-Emitting Diodes (OLEDs)