Add time:08/17/2019         Source:sciencedirect.com

Two single- and a dual-type electrochromic devices (ECDs) based on poly(3-tetradecylthiophene) (PTDT) and poly(3,4-ethylenedioxythiophene) (PEDOT) with lithium salt in PMMA gel-media were prepared. In the single-type ECDs, red PTDT (λmax: 494 nm) and blue PEDOT (λmax: 596 nm) in the reduced states could be switched to their bleached oxidized forms. In the dual-type ECD, the color changed between dark red (λmax: 502 nm) and dark blue (λmax: 602 nm) by switching the applied voltage (E(PTDT) versus E(PEDOT)) between −2.2 and 2.2 V. Its electronic absorption was a combination of those of PTDT and PEDOT. Its optical switching rate was much faster than the single-type ECDs. It is presumably because the capacitive charging of each bare ITO electrode in the single-type ECDs partially compensates the applied voltage while in the dual-type ECD, both the electrodes participate in the faradaic reactions. In this dual-type ECD, when one of the electrodes takes part in coloring electrode, the other takes part in complementary electrode leading to fast switching.

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