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    Dynamically Tuneable Reflective Structural Coloration with Electroactive Conducting Polymer Nanocavities

    Year: 2021

    Journal: Adv. Mater., Volume 33, DEC

    Authors: Rossi, Stefano; Olsson, Oliver; Chen, Shangzhi; Shanker, Ravi; Banerjee, Debashree; Dahlin, Andreas; Jonsson, Magnus P.

    Organizations: Swedish Foundation for Strategic Research; Knut and Alice Wallenberg Foundation; Swedish Research Council (VR); Wenner-Gren Foundations; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]

    Keywords: color-tuning; conductive polymer; electroactive nanocavity; reflective displays; structural colors

    Dynamic control of structural colors across the visible spectrum with high brightness has proven to be a difficult challenge. Here, this is addressed with a tuneable reflective nano-optical cavity that uses an electroactive conducting polymer (poly(thieno[3,4-b]thiophene)) as spacer layer. Electrochemical doping and dedoping of the polymer spacer layer provides reversible tuning of the cavity's structural color throughout the entire visible range and beyond. Furthermore, the cavity provides high peak reflectance that varies only slightly between the reduced and oxidized states of the polymer. The results indicate that the polymer undergoes large reversible thickness changes upon redox tuning, aided by changes in optical properties and low visible absorption. The electroactive cavity concept may find particular use in reflective displays, by opening for tuneable monopixels that eliminate limitations in brightness of traditional subpixel-based systems.
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