This patent addresses these challenges by introducing a novel composite material comprising an optically transparent wood substrate impregnated with a polymer (e.g., PMMA), a thermochromic halide perovskite layer (e.g.,MA4PbI5Br·2H2O ), and a protective polymer layer (e.g., PMMA).

Passive radiative cooling paint (PRCP), an emerging applied Nano-material technology that can block the incoming solar irradiance from the sun, while simultaneously creating a cooling effect by emitting thermal radiation to the cold universe (~3 K).

The patent introduces a multi-layer coating