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<p>WO<sub>3</sub> quantum-dot electrochromic devices have exhibited significant commercial potential, owing to their ultra-fast response speed, wide optical transmittance modulation, and low-cost preparation process. However, the application of quantum-dots in electrochromic devices has encountered bottleneck issues. Specifically, quantum-dots tend to agglomerate or be eroded by electrolyte. Herein we propose strategies to manipulate the coating material of quantum-dots at the molecular scale for these issues, achieving single-dot and multi-dot coating of quantum-dots. The single-dot coated quantum-dot device has a transmittance modulation of 54.5% and 69.1% at wavelengths of 580 and 800 nm, respectively, with colouring efficiencies of 101.7 and 163.1 cm<sup>2</sup>/C, and a bleaching/colouring time of 4.0/7.5 s. Meanwhile, the transmittance modulation of the multi-dot coated quantum-dot device is up to 77.4% at 580 nm and 86.0% at 800 nm with colouring efficiencies of 80.7 and 135.3 cm<sup>2</sup>/C and a bleaching/colouring time of 11.0/13.0 s. After 10,000 CV-tests, the multi-dot coated quantum-dot device still operates stably. These indicate advantages of the strategies.</p><p></p>

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Coating strategies for improving electrochromic WO3 quantum-dots

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月28日

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  • Di Yang,
  • Shen Deng,
  • Ziyi Jin,
  • Ting Yang,
  • Xujie Jia,
  • Shuhui Bo

摘要

WO3 quantum-dot electrochromic devices have exhibited significant commercial potential, owing to their ultra-fast response speed, wide optical transmittance modulation, and low-cost preparation process. However, the application of quantum-dots in electrochromic devices has encountered bottleneck issues. Specifically, quantum-dots tend to agglomerate or be eroded by electrolyte. Herein we propose strategies to manipulate the coating material of quantum-dots at the molecular scale for these issues, achieving single-dot and multi-dot coating of quantum-dots. The single-dot coated quantum-dot device has a transmittance modulation of 54.5% and 69.1% at wavelengths of 580 and 800 nm, respectively, with colouring efficiencies of 101.7 and 163.1 cm2/C, and a bleaching/colouring time of 4.0/7.5 s. Meanwhile, the transmittance modulation of the multi-dot coated quantum-dot device is up to 77.4% at 580 nm and 86.0% at 800 nm with colouring efficiencies of 80.7 and 135.3 cm2/C and a bleaching/colouring time of 11.0/13.0 s. After 10,000 CV-tests, the multi-dot coated quantum-dot device still operates stably. These indicate advantages of the strategies.