Dynamic multicolour tuning in π-conjugated polymers towards flexible electrochromic displays

Area of Science:

• Materials Science
• Polymer Chemistry
• Optoelectronics

Background:

• Multicolour electrochromic materials are key for next-generation electronic displays.
• Current materials face challenges in achieving wide colour gamut and subtle tuning due to rigid energy levels.

Purpose of the Study:

• To design and develop electrochromic conjugated polymers with enhanced colour tunability.
• To overcome limitations of inflexible energy level structures in active materials.

Main Methods:

• Fine-tuning energy level structures of π-conjugated polymers.
• Synthesizing and characterizing novel multicolour electrochromic polymers.
• Fabricating and testing ultrathin, flexible prototype devices.

Main Results:

• Achieved nearly full-colour gamut with versatile hues, chromas, and lightnesses.
• Demonstrated fast switching (∼1.0 s), high colouration efficiency (160.4 cm² C⁻¹), and good reversibility (>90% after 10,000 cycles).
• Developed flexible prototype devices showcasing wide colour gamut and saturated multicolour tunability.

Conclusions:

• The developed π-conjugated polymers offer significant advancements in multicolour electrochromic technology.
• The design principles can be applied to various optoelectronic applications.
• This work paves the way for advanced dynamic display technologies.