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4709729 
Journal Article 
Improving the color switch contrast in PEDOT:PSS-based electrochromic displays 
Kawahara, Jun; Ersman, PA; Engquist, I; Berggren, M 
2012 
1 
Organic Electronics
ISSN: 1566-1199 
ELSEVIER SCIENCE BV 
AMSTERDAM 
13 
3 
469-474 
WOS:000300392100017 
Poly(3,4-ethylenedioxythiophene) chemically doped with poly(styrene sulfonic acid) (PEDOT:PSS) is a material system commonly used as a conductive and transparent coating in several important electronic applications. The material is also electrochemically active and exhibits electrochromic (EC) properties making it suitable as the active element in EC display applications. In this work uniformly coated PEDOT: PSS layers were used both as the pixel electrode and as the counter electrode in EC display components. The pixel and counter electrodes were separated by a whitish opaque and water-based polyelectrolyte and the thicknesses of the two EC layers were varied independently in order to optimize the color contrast of the display element. A color contrast (Delta E*, CIE L*a*b* color space) exceeding 40 was obtained with maintained relatively short switching time at an operational voltage less than 2 V. (C) 2011 Elsevier B. V. All rights reserved. 
PEDOT:PSS; Electrochromic displays; Color contrast; Printed electronics; Flexible displays