Scalable Epsilon‐Near‐Zero Glass Enabling Multi‐Band Radiative Regulation

ABSTRACT Windows contribute to 40% of building energy consumption, as they directly transmit solar radiation, thereby increasing the cooling demand. Therefore, developing energy‐efficient glass with multi‐band thermal radiation regulation effect and low cost becomes an urgent requirement. However, realizing energy‐efficient glass that simultaneously has superior performance and simple structure is still challenging, because complicated broadband spectrum manipulation requires intricate material design. Herein, we demonstrate a meter‐scale epsilon‐near‐zero (ENZ) glass requiring only three layers of optical films, which enables multi‐band radiative regulation by transmitting visible light, blocking near‐infrared (NIR) radiation, and emitting heat within the atmospheric window. High visible transmittance and low NIR transmittance are obtained by regulating the ENZ wavelength of indium tin oxide, and high emittance is realized through the intrinsic functional group properties of organic polymers. This ENZ glass provides an annual energy conservation of 42.9 kWh/m 2 compared with ordinary glass when used in office buildings, and lowers the temperature in greenhouse by 14°C when used in plant cultivation. This work provides an effective solution for designing low‐cost and high‐performance energy‐efficient materials.