Abstract

First, the poly(3-methylthiophene) (PMeT) and the polyaniline (PANI) of the conductive polymer electrochromic thin films had been deposited on the indium tin oxide/glass (ITO/Glass) substrate by cyclic vltammetry (CV) and applied to electrochromic display (ECD) were investigated with different molarity electrolyte solutions to obtain optimal parameters in order to improve homogeneous and reversible deposition. Second, the PMeT and PANI thin films were investigated with different scan rates of deposition to obtain optimal parameters in order to improve property and applied to ECD. The optical, electrical and color properties of PMeT and PANI thin films were analyzed by using ultraviolet-visible (UV-Vis) spectroscopy, electrochemical impedance spectroscopy (EIS), CV measurement system, and micro spectroscopy. The ECD which with PMeT thin film fabricated at 200 mV/s (sample PMeT200) has the highest transmittance variation ($\triangle {\rm T}_{450~{\rm nm}}=15~\%$ and $\triangle {\rm T}_{650~{\rm nm}} = 40~\%$) and the response time are 14 s $({\rm T}_{450~{\rm nm}})$ and 15 s $({\rm T}_{650~{\rm nm}})$, respectively. The CIE 1931 chromaticity coordinates of ECD which with PMeT thin film fabricated at 200 mV/s (sample PMeT200) has the best shape of tracks. The PANI thin film fabricated at 200 mV/s (samplePANI200) has the highest transmittance variation $(\triangle {\rm T}_{550~{\rm nm}} = 24~\%)$. The CIE 1931 chromaticity coordinates of PANI thin film fabricated at 200 mV/s (sample PANI200) has the best shape of tracks.

© 2014 IEEE

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