An Al3+ intercalation/de-intercalation-enabled dual-band electrochromic smart window featuring simultaneously a high optical modulation, fast response and long cycle life.

A dual-band electrochromic energy storage (DEES) smart window was demonstrated for the first time using Ta-doped TiO 2 nanocrystals as the active material. The demonstrative DEES unit can independently control the visible light and near-infrared (solar heat) transmittance with good electrochromic performance and delivers a high charge-storage capacity of 466.5 mA h m À2 at 150 mA m À2 of current density.

As an effective method to improve the optical properties and stability of perovskite matrix, doped halide perovskites have attracted extensive attention in the field of optoelectronic applications. Herein, a series of all inorganic lead-free Te4+-doped Cs2ZrCl6 vacancy-ordered perovskites were successfully synthesized with different Te-doping concentrations by a solvothermal method, and deliberate Te4+-doping results in green-yellow triplet self-trapped exciton (STE) emission with a high photoluminescence quantum yield (PLQY) of 49.0%. The efficient energy transfer was observed from singlet to triplet emission. Further, the effects of A-site Rb alloying on the optical properties and stability were investigated. We found that A-site Rb alloying and C-site cohalogenation did not change the luminescence properties of Te4+, but the addition of a small amount of Rb+ can improve the PL intensity and moisture stability. Our results provide physical insights into the nS2 Te4+-ion-doping-induced emissive mechanism and shed light on improving the environmental stability for further applications.

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