Rapid Room‐Temperature Synthesis of Te 4+ ‐Doped Cs 2 ZrCl 6 Vacancy‐Ordered Double Perovskites With Tunable Luminescence Triggered by Extreme Conditions for Advanced Optical Thermometry and Manometry

ABSTRACT Te 4+ ‐doped Cs 2 ZrCl 6 vacancy‐ordered double perovskites with intense self‐trapped excitons emissions were prepared via a rapid room‐temperature precipitation method. Utilizing low‐temperature engineering, tunable luminescence was realized in the synthesized products, resulting in the maximum temperature relative sensitivities of 0.48% and 0.81% K −1 , respectively, when the emission band centroid and lifetime were employed as thermometric parameters. Moreover, in situ high‐pressure Raman spectra and X‐ray diffraction patterns confirmed the excellent structural stability and reversibility of the studied samples. When the as‐prepared compounds experienced the high‐pressure conditions, spectral blue‐shift and broadened bandwidth were observed, resulting in the tunable luminescence at high‐pressure, which endowed their applications in pressure sensing. Furthermore, via utilizing the emission band centroid and full width at half maximum as manometric parameters, the maximum pressure sensitivities of the final products were 6.30 and 1.86 nm GPa −1 , respectively. Additionally, based on the pressure‐related color coordinate, the manometric properties of the resultant products were further investigated, yielding a maximum sensitivity of 4.25% GPa −1 . Our findings did not only propose a rapid synthesis route for the Te 4+ ‐doped Cs 2 ZrCl 6 vacancy‐ordered double perovskites but also highlighted that their luminescence properties can be regulated via extreme conditions engineering, showcasing their feasibilities in advanced optical thermometry and manometry.