Adaptive control of broadband light is essential for diverse applications including building energy management and light modulation. Here, we present porous polymer coatings (PPCs), whose optical transmittance changes upon reversible wetting with common liquids, as a platform for optical management from solar to thermal wavelengths. In the solar wavelengths, reduction in optical scattering upon wetting changes PPCs from reflective to transparent. For poly(vinylidene fluoride-co-hexafluoropropene) PPCs, this corresponds to solar and visible transmittance changes of up to 0.74 and 0.80, respectively. For infrared (IR) transparent polyethylene PPCs, wetting causes an “icehouse-to-greenhouse” transition where solar transparency rises but thermal IR transparency falls. These performances are either unprecedented or rival or surpass those of notable optical switching (e.g., electrochromic and thermochromic) paradigms, making PPCs promising for large-scale optical and thermal management. Specifically, switchable sub-ambient radiative cooling (by 3.2°C) and above-ambient solar heating (by 21.4°C), color-neutral daylighting, and thermal camouflage are demonstrated.

宽带光的自适应控制对于包括建筑物能源管理和光调制在内的多种应用至关重要。在这里，我们介绍了多孔聚合物涂层（PPC），其光透射率在与普通液体可逆润湿后会发生变化，作为从太阳到热波长的光学管理的平台。在太阳波长下，润湿时光学散射的减少将PPC从反射变为透明。对于聚偏二氟乙烯-共-六氟丙烯PPC，这分别对应于太阳和可见光透射率变化，分别高达0.74和0.80。对于红外（IR）透明聚乙烯PPC，润湿会导致“从冰室到温室”的过渡，其中太阳透明度增加，而热红外透明度降低。这些性能是空前的，甚至是竞争对手，或者超过了显着的光学切换（例如电致变色和热致变色）范例，这使得PPC有望用于大规模的光学和热管理。具体而言，展示了可切换的低于环境辐射散热（3.2摄氏度）和高于太阳能辐射（21.4摄氏度），中性色采光和热伪装。