Scalable-Designed Photonic Metamaterial for Color-Regulating Passive Daytime Radiative Cooling

• The 55 wt% solid content monodispersed latexes were synthesized under the synergistic action of ionic and nonionic surfactants. • The 55 wt% solid content monodispersed latexes open a homogeneous assembly avenue, establishing high-crystallinity photonic metamaterial (crystallinity: 71.5%). • We developed scalable-designed and color-regulating passive daytime radiative cooling coating based on the high-crystallinity photonic metamaterial, showing high solar reflectance (~0.94), high infrared emittance (~0.97), large sub-ambient cooling temperature (average 5.3 °C), and great cooling power (~95.5 W m−2). • The work provides a promising route to reduce carbon emissions and energy consumption for global sustainability.