Coloration mechanisms of Ag deposition‐based multicolor electrochromic device investigated by morphology of Ag deposit and its optical properties

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  • Ryou Onodera
    Department of Image and Materials Science, Graduate School of Advanced Integration Science Chiba University 1‐33 Yayoi‐cho, Inage‐ku Chiba 263‐8522 Japan
  • Ayako Tsuboi
    Department of Image and Materials Science, Graduate School of Advanced Integration Science Chiba University 1‐33 Yayoi‐cho, Inage‐ku Chiba 263‐8522 Japan
  • Kazuki Nakamura
    Department of Image and Materials Science, Graduate School of Advanced Integration Science Chiba University 1‐33 Yayoi‐cho, Inage‐ku Chiba 263‐8522 Japan
  • Norihisa Kobayashi
    Department of Image and Materials Science, Graduate School of Advanced Integration Science Chiba University 1‐33 Yayoi‐cho, Inage‐ku Chiba 263‐8522 Japan

説明

<jats:title>Abstract</jats:title><jats:p>Electrochromism, phenomenon of reversible color change induced by electrochemical redox reactions, is one of the prime candidates for full‐color electronic paper. Recently, we reported Ag‐deposition based multicolor electrochromic device showing color change between three primary colors of cyan, magenta, and yellow. These observed spectra include both absorbing and reflectance components. Therefore, it is necessary to separate these components in order to analyze coloration mechanism of the device. In this paper, coloration mechanisms of Ag deposition‐based multicolor electrochromic device were investigated in terms of measurement of the actual absorption and actual reflection of the device. Morphologies of the deposited Ag nanoparticles were also investigated by FE‐SEM, and then relationship between optical properties and deposited Ag morphologies was examined. As the results, color appearances of magenta and yellow state of the device were mainly dominated by absorption component of localized surface plasmon resonance of the deposited Ag nanoparticles. On the other hand, cyan state of the device was based on absorption as well as reflection component induced by thin film structure of the Ag deposit.</jats:p>

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