Zhuang Biying, Zhang Meiyu, Li Ang, Zhang Qianqian, Liu Jingbing, Zheng Zilong, Wang Hao
Key Laboratory for New Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, PR China.
Key Laboratory for New Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, PR China.
J Colloid Interface Sci. 2024 Dec 15;676:670-679. doi: 10.1016/j.jcis.2024.07.133. Epub 2024 Jul 20.
Multicolour electrochromic materials have been considered as a promising alternative to achieve dynamic full-colour tuning towards next-generation electronic display technology. However, the development of electrochromics with wide colour gamut and subtle multicolour tunability still remains challenging due to inflexible energy level structures in intrinsic active materials. Herein, the electrochromic π-conjugated polymers with rich and subtle colour tunability were designed and developed based on a fine adjustment on the energy level structures. The chromatic transition covers almost full-colour gamut, and each colour scheme has a rich variety of categories stemming from versatile hues, chromas and lightnesses. Moreover, the multicolour π-conjugated polymers also demonstrate superior overall electrochromic performance, including fast switching (∼1.0 s), high colouration efficiency (160.4 cm C@550 nm) and good reversibility (over 90 % retention after 10,000 cycles). As a proof of concept, ultrathin and flexible prototype devices are developed by utilizing the multicolour π-conjugated polymers as electrochromic active layer, exhibiting a wide colour gamut and highly saturated multicolour tunability. The design principles proposed in this work may also be applicable to diverse optoelectronic applications.
多色电致变色材料被认为是实现下一代电子显示技术动态全色调节的一种有前景的替代方案。然而，由于本征活性材料中不灵活的能级结构，开发具有宽色域和精细多色可调性的电致变色材料仍然具有挑战性。在此，基于对能级结构的精细调整，设计并开发了具有丰富且精细颜色可调性的电致变色π共轭聚合物。其颜色转变几乎覆盖了全色域，并且每种配色方案都因多样的色调、色度和明度而具有丰富的类别。此外，多色π共轭聚合物还表现出优异的整体电致变色性能，包括快速切换（约1.0秒）、高显色效率（在550纳米处为160.4平方厘米每库仑）和良好的可逆性（10000次循环后保留率超过90%）。作为概念验证，通过将多色π共轭聚合物用作电致变色活性层，开发出了超薄且柔性的原型器件，展现出宽色域和高饱和度的多色可调性。这项工作中提出的设计原则也可能适用于各种光电应用。
