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Proceedings Paper

Preparation and properties of fully solid state electrochromic-display thin film from a sol-gel process
Author(s): Keishi Nishio; Tadanori Sei; Toshio Tsuchiya
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Paper Abstract

Fully solid state electrochromic displays (ECD) have been prepared several times. But, they all needed more than 1 minute to complete coloring or breaching. Electrochromism of amorphous material is expected to be faster than that of crystalline one by its faster diffusion coefficients of ions due to the open structure. In this study, electrochromic films and a gel electrolyte were made by a sol-gel process using metal salts and alkoxide as raw materials. Tungsten oxide, iridium oxide films and a gel electrolyte were used to fabricate a fully solid state ECD (electrode/tungsten oxide/gel electrolyte/iridium oxide/electrode) and it electrochromic properties were investigated. Crystalline and amorphous tungsten oxide and iridium oxide films were prepared on soda lime silica glass substrates sputter-coated with indium tin oxide (ITO). Electrochromic properties of amorphous WO3 film were more significant than that of crystalline one. On the other hand, electrochromic properties of amorphous iridium oxide film were less than crystalline one. The ECD showed reversible transmittance modulation of 35% (at 800 nm, film thickness: tungsten oxide 400 nm, iridium oxide 200 nm) under alternative voltage apply of plus or minus 3 V for 0.2 sec. The ECD kept the same transmittance modulation during 200 color-breach cycles.

Paper Details

Date Published: 2 October 1997
PDF: 7 pages
Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); doi: 10.1117/12.279169
Show Author Affiliations
Keishi Nishio, Science Univ. of Tokyo (Japan) and Musashi Institute of Technology (Japan)
Tadanori Sei, Science Univ. of Tokyo (Japan)
Toshio Tsuchiya, Science Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 3136:
Sol-Gel Optics IV
Bruce S. Dunn; John D. Mackenzie; Edward J. A. Pope; Helmut K. Schmidt; Masayuki Yamane, Editor(s)

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