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    A New Near-Infrared Switchable Electrochromic Polymer and Its Device Application
    (Wiley, 2010) Sefer, Emre; Koyuncu, Fatma Baycan; Oguzhan, Eda; Koyuncu, Sermet
    A new near-infrared switchable electrochromic polymer containing carbazole pendant (poly-SNSC), synthesized by electrochemical polymerization of 2,5-bis-dithienyl-1H-pyrrole (SNS) main chain, has been prepared. The electrochemical and optical properties of SNSC monomer and its polymer have been investigated. Because of having two different electro-donor moieties; that is, carbazole and SNS, SNSC gave two separate electrochemical oxidation and also light brown color of the film in the neutral state turn into gray on oxidation. An electrochromic device, contructed in the sandwich configuration [indium tin oxide (ITO)-coated glass/anodically coloring polymer (poly-SNSC)//gel electrolyte//cathodically coloring polymer (PEDOT)/ITO-coated glass] and exhibited a high coloration efficiency (1216 cm(2) C-1), a very short response time (about 0.3 s), low driving voltage, and a high redox stability. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 4419-4427, 2010
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    A new processable donor-acceptor polymer displaying neutral state yellow electrochromism
    (Elsevier Sci Ltd, 2013) Oguzhan, Eda; Bilgili, Hakan; Koyuncu, Fatma Baycan; Ozdemir, Eyup; Koyuncu, Sermet
    We report here the synthesis of a new solution processable neutral state yellow polymeric electrochromic material containing 2,5-bis-dithienyl-1H-pyrrole (SNS)-donor and 1,8 naphthalimide-acceptor (SNS-NI) as a subunit. The electrochemical and optical properties were investigated via cyclic voltammetry (CV), UV Vis absorption and fluorescence emission measurements, respectively. Besides, electrochromic performance of poly(SNS NI) has been compared to the both the film preparation method and poly(1-phenyl-2,5-dithiophen-2-ylpyrrole) [poly(SNS-P)] as a standard polymer. In the poly(SNS-NI), yellow color of the polymer film at neutral state converted to green and then dark blue upon the polymer film fully oxidized in the positive regime. SNS NI polymer film prepared via spin casting process exhibits a high contrast ratio in the near-IR region (Delta T% = 56% at 890 nm), a response time of about 1 s, high coloration efficiency (299 cm(2) C-1) and retained its performance by 98.6% even after 5000 cycles. Finally, the results clearly indicate that both electronic nature of the molecule and film preparation method have a major impact on electrochromic performance of these polymers. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.