Advanced Materials and Process Engineering Laboratory, Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
Advanced Materials and Process Engineering Laboratory, Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
ACS Appl Mater Interfaces. 2023 Jun 14;15(23):28288-28299. doi: 10.1021/acsami.3c02902. Epub 2023 Jun 5.
The low power consumption of electrochromism makes it widely used in actively shaded windows and mirrors, while flexible versions are attractive for use in wearable devices. Initial demonstration of stretchable electrochromic elements promises good conformability to complex surfaces. Here, fully integrated intrinsically stretchable electrochromic devices are demonstrated as single elements and 3 × 3 displays. Conductive and electrochromic ionic liquid-doped poly(3,4-ethylenedioxythiophene) polystyrene sulfonate is combined with poly(vinyl alcohol)-based electrolyte to form complete cells. A transmission change of 15% is demonstrated, along with a reflectance change of 25% for opaque reflective devices, with <7 s switching time, even under 30% strain. Stability under both electrochemical and mechanical strain cycling is demonstrated. A passive matrix display exhibits addressability and low cross-talk under strain. Comparable optical performance to flexible electrochromics and higher deformability provide attractive qualities for use in wearable, biometric monitoring, and robotic skin devices.
电致变色的低功耗使其广泛应用于主动遮阳窗和镜子，而柔性版本则吸引了人们对可穿戴设备的应用。可拉伸电致变色元件的初步演示有望实现良好的复杂表面适应性。在这里，作为单个元件和 3×3 显示器展示了完全集成的固有可拉伸电致变色器件。将具有导电性和电致变色的离子液体掺杂的聚(3,4-亚乙基二氧噻吩)聚苯乙烯磺酸盐与基于聚乙烯醇的电解质结合，形成完整的电池。对于不透明反射器件，其透射率变化为 15%，反射率变化为 25%，开关时间小于 7 s，即使在 30%的应变下也是如此。电化学和机械应变循环下的稳定性也得到了证明。无源矩阵显示器在应变下具有可寻址性和低串扰。与柔性电致变色相比具有相当的光学性能和更高的可变形性，为可穿戴、生物识别监测和机器人皮肤设备的应用提供了有吸引力的品质。
