Recent advances in organic dual-band electrochromism

Abstract

Dual-band electrochromism has garnered significant attention in recent years due to its ability to independently control visible and near-infrared light. Organic dual-band electrochromic (OVNEC) materials have gradually emerged in fields such as smart windows, advanced displays, and camouflage, owing to their excellent light modulation performance, flexible design capabilities, and large-area low-cost fabrication characteristics. By precisely regulating the absorption/transmission properties of visible and near-infrared light, they present significant prospects for expanding traditional visible light applications. This review summarizes the latest advancements in organic dual-band electrochromic devices (OVNECDs) and materials. Based on the structure of OVNECDs, it elaborates on the electrochromic layer, ion storage layer, electrolyte layer, and transparent conductive layer, delving into the dual-band electrochromic mechanism and device operating principles of OVNEC materials. Furthermore, OVNEC materials are categorized into small molecules and conjugated polymers for detailed discussion. The review concludes by summarizing the main challenges currently faced and future development directions, offering insights from three aspects: simplification of device structure, optimization of small molecule structures, and breakthroughs in conjugated polymers, emphasizing the indispensable significance of ongoing research and innovation in this emerging field.

Keywords: Conjugated polymers; Dual band; Electrochromism; Organic materials; Small molecules.