A new series of orange highly near-infrared reflective pigments based on Fe-doped La 2 W 2 O 9 were effectively fabricated via solution combustion synthesis. The acquired pigment powders were characterized by powder X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, Xray photoelectron spectroscopy, ultraviolet−visible−near-infrared spectrophotometry, and CIE 1976 L*a*b* color scales. Then, the energy consumption of the air-conditioning system was simulated based on EnergyPlus software. The results showed that the doping of Fe 3+ ions will change the color of the pigment from white to orange. Meanwhile, the band gaps of La 2 W 1.85 Fe 0.15 O 9-δ and La 2 W 1.8 Fe 0.2 O 9-δ shifted from 3.71 to 3.07 eV and 2.96 eV, respectively. The typical La 2 W 1.85 Fe 0.15 O 9-δ pigment powders showed the highest near-infrared reflectance of 89.25% between 700 and 2500 nm and impressive color (L* = 74.20, a* = 22.69, and c* = 22.42). The simulation results illustrated that the homeowner could save $7.32 per month by coating the walls and roofs of the building with the energy-saving paint composed of La 2 W 1.8 Fe 0.2 O 9-δ . Excellent chemical stability and high near-infrared reflectance made the synthesized pigments a potential candidate for energy-saving coatings.
Thermochromic smart windows with rational modulation in indoor temperature and brightness draw considerable interest in reducing building energy consumption, which remains a huge challenge to meet the comfortable responsive temperature and the wide transmittance modulation range from visible to near‐infrared (NIR) light for their practical application. Herein, a novel thermochromic Ni(II) organometallic of [(C2H5)2NH2]2NiCl4 for smart windows is rationally designed and synthesized via an inexpensive mechanochemistry method, which processes a low phase‐transition temperature of 46.3 °C for the reversible color evolution from transparent to blue with a tunable visible transmittance from 90.5% to 72.1%. Furthermore, cesium tungsten bronze (CWO) and antimony tin oxide (ATO) with excellent NIR absorption in 750–1500 and 1500–2600 nm are introduced in the [(C2H5)2NH2]2NiCl4‐based smart windows, realizing a broadband sunlight modulation of a 27% visible light modulation and more than 90% of NIR shielding ability. Impressively, these smart windows demonstrate stable and reversible thermochromic cycles at room temperature. Compared with the conventional windows in the field tests, these smart windows can significantly reduce the indoor temperature by 16.1 °C, which is promising for next‐generation energy‐saving buildings.
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