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Colorless-to-colorful switching electrochromic polyimides with very high contrast ratio

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  • Qiang Zhang

    (National Taiwan University of Science and Technology)

  • Chou-Yi Tsai

    (National Taiwan University of Science and Technology)

  • Lain-Jong Li

    (University of New South Wales)

  • Der-Jang Liaw

    (National Taiwan University of Science and Technology)

Abstract

Colorless-to-colorful switching electrochromic polymers with very high contrast ratio are unattainable and attractive for the applications of smart wearable electronics. Here we report a facile strategy in developing colorless-to-colorful switching electrochromic polyimides by incorporating with alicyclic nonlinear, twisted structures and adjusted conjugated electrochromophores, which minimize the charge transfer complex formation. It is noted that, by controlling the conjugation length of electrochromophore, the colorless-to-black switching electrochromic polymer film (PI-1a) exhibites an ultrahigh integrated contrast ratio up to 91.4% from 380 to 780 nm, especially up to 96.8% at 798 nm. In addition, PI-1a film with asymmetric structure also demonstrates fast electrochemical and electrochromic behaviors (a switching and bleaching time of 1.3 s and 1.1 s, respectively) due to the loose chain stacking, which provides more pathways for the penetration of counterion. Moreover, the colorless-to-black EC device based on PI-1a reveals an overall integrated contrast ratio up to 80%.

Suggested Citation

  • Qiang Zhang & Chou-Yi Tsai & Lain-Jong Li & Der-Jang Liaw, 2019. "Colorless-to-colorful switching electrochromic polyimides with very high contrast ratio," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09054-8
    DOI: 10.1038/s41467-019-09054-8
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    Cited by:

    1. Dinghui Chen & Zizheng Tong & Qiushi Rao & Xingchen Liu & Hong Meng & Wei Huang, 2024. "High-Performance Black Copolymers Enabling Full Spectrum Control in Electrochromic Devices," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Tiantian Xue & Chenyu Zhu & Dingyi Yu & Xu Zhang & Feili Lai & Longsheng Zhang & Chao Zhang & Wei Fan & Tianxi Liu, 2023. "Fast and scalable production of crosslinked polyimide aerogel fibers for ultrathin thermoregulating clothes," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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