  Daytime radiative coolers cool objects below the air temperature without any
electricity input, while most of them are limited by a silvery or whitish
appearance. Colored daytime radiative coolers (CDRCs) with diverse colors,
scalable manufacture, and sub-ambient cooling have not been achieved. We
introduce a polymer-Tamm photonic structure to enable a high infrared emittance
and an engineered absorbed solar irradiance, governed by the quality factor
(Q-factor). We theoretically determine the theoretical thresholds for
sub-ambient cooling through yellow, magenta, and cyan CDRCs. We experimentally
fabricate and observe a temperature drop of 2.6-8.8 degrees Celsius on average
during daytime and 4.0-4.4degrees Celsius during nighttime. Furthermore, we
demonstrate a scalable-manufactured magenta CDRC with a width of 60 cm and a
length of 500 cm by a roll-to-roll deposition technique. This work provides
guidelines for large-scale CDRCs and offers unprecedented opportunities for
potential applications with energy-saving, aesthetic, and visual comfort
demands.
