Development of electrochromic devices with high durability, high coloration efficiency and high memory indication

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05649
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: Nagasaki University
• Principal Investigator: Tahara Hironobu 長崎大学, 工学研究科, 助教 (80631407)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 酸化還元活性イオン液体 / エレクトロクロミックイオン液体 / ビオロゲン / カルバゾール / レドックスイオン液体

Outline of Final Research Achievements

In this study, we succeeded in the fabrication of electrochromic devices with high coloration efficiency and coloring memory behavior using redox-active ionic liquids consisting of electrochromic substances. The coloration efficiency was improved by using electrochromic anodic substances and cathode substances. The stability of the device was owing to the nonvolatility of the ionic liquids, and the coloring memory property was owing to the high viscosity of them. The devices exhibited large absorbance changes around the UV-vis region and possessed large absorption bands around the near-infrared region, which can be applied to smart windows.

Free Research Field

機能物性化学

Academic Significance and Societal Importance of the Research Achievements

エレクトロクロミズムは，低消費電力で駆動する表示デバイスや調光デバイスなどに応用が可能な現象である。応用のためにはエレクトロクロミズムを示す物質や電解質の安定性が大きな課題となっている。本研究は，その解決に寄与をする成果である。