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Printed Multicolor High-Contrast Electrochromic Devices.

Bo-Han Chen, Sheng-Yuan Kao, Chih-Wei Hu1

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Summary
This summary is machine-generated.

This study demonstrates inkjet-printed multicolored electrochromic devices (ECDs) using metallo-supramolecular polymers. The process allows for tunable colors on flexible displays with high contrast and fast response times.

Keywords:
electrochromic devicesflexible electronicsinkjet printingmetallo-supramolecularmulticolor patterning

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Electrochromic devices (ECDs) offer tunable optical properties.
  • Current fabrication methods can be complex and limited in color versatility.
  • Developing multi-color ECDs is crucial for advanced display technologies.

Purpose of the Study:

  • To evaluate the feasibility of creating multicolored electrochromic devices (ECDs) using inkjet printing.
  • To explore the use of metallo-supramolecular polymers (MEPE) for tunable color generation in ECDs.
  • To assess the performance of these flexible ECDs under various conditions.

Main Methods:

  • Inkjet printing of two primary colored metallo-supramolecular polymer (MEPE) solutions onto flexible electrodes.
  • Digital control of print dosages for precise color adjustment without premixing.
  • Lamination with solid transparent thin film electrolyte and transparent conductive thin film to form ECDs.
  • Electrochemical characterization including transmittance change (ΔT) and coloration efficiency.

Main Results:

  • Successfully fabricated inkjet-printed multicolored ECDs with digitally controlled color outputs.
  • Achieved a significant transmittance change (ΔT) of 40.1% and high coloration efficiency of 445 cm(2) C(-1).
  • Demonstrated a fast darkening time of 2 seconds and maintained good performance (ΔT of 30.1%) under bending conditions.

Conclusions:

  • Inkjet printing of MEPE solutions is a feasible all-solution process for fabricating multicolored ECDs.
  • The developed ECDs exhibit excellent electrochromic performance and mechanical flexibility.
  • This approach can be extended to create diverse color displays and other display types.