Yi-Jian Qian, Fu-Xing Zhao, Xue-Feng Huang, Yi-Fei Lu, Chen Chen, Meng-Han Zhu, Wei Peng, Ni-Na Su, Si-Zhe Sheng, Jing-Han Yuan, Sheng Xu, Jin-Long Wang, Shu-Hong Yu
Electrochromic (EC) smart windows are promising for improving indoor lighting and thermal control in energy-efficient buildings. Despite their ability to regulate visible (VIS) and near-infrared (NIR) solar radiation, conventional EC smart windows rarely modulate mid-infrared (MIR) radiation. Here, we report a multimode EC smart window (four modes, including warm, bright, cool, and dark) capable of synergistically modulating the VIS, NIR, and MIR spectra via voltage control, achieved through a layer-by-layer design of functional electrode materials of aluminum-doped zinc oxide nanocrystals (AZO NCs) and W18O49 nanowires. It exhibits a maximum modulation rate of 0.39 for emissivity at 10.0 μm in the MIR and 56.0% for transmittance at 708 nm in the solar spectrum, demonstrating significant energy savings across all designed operational modes for specific environmental scenarios. Energy-saving simulations reveal that the EC device exhibits a synergistic effect, surpassing the simple additive performance of solar transmittance-regulating and emissivity-modulating devices.