Passive radiative cooling (PRC) is a promising strategy for mitigating global warming by reducing reliance on energy-intensive cooling systems. However, conventional PRC materials are largely limited to white or silver appearances, restricting aesthetic integration and practical adoption in outdoor applications. Here, we report a nano-photonically engineered colored composite film fabricated via a scalable thermally induced phase-separation technique. The film consists of a nano-photonic colored poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) composite layer and an aluminum-coated polyethylene terephthalate reflector (Al-PET). The nano-photonic PVDF-HFP composite layer and the Al-PET reflector synergistically enable a high solar reflectance of 93.4% and a mid-infrared emissivity of 94.6% within the atmospheric window. Field tests under outdoor solar exposure demonstrate that model roofs integrated with the photonic PVDF-HFP/Al-PET film (P-PET) maintain indoor temperatures up to 9.5 °C lower than ambient. When coupled with active cooling systems, the film reduces CO 2 emissions by approximately 72.3 kg CO 2 m −2 yr −1 . The excellent passive cooling performance and thermal management capability of the nano-photonic P-PET film provide a practical pathway toward energy-efficient colored surfaces for outdoor building applications.
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