Extreme condition triggered spectral evolution in Sb3+-doped Cs2NaScCl6 double perovskites for luminescent manometry and thermometry

A series of Sb 3+ -doped Cs 2 NaScCl 6 double perovskites were synthesized to realize bifunctional optical sensing. Upon 337 nm excitation, the designed compounds emitted intense blue emission, whose intensity was dependent on dopant content and the involved concentration quenching mechanism was caused by electric dipole-dipole interaction. The impact of temperature on the luminescence properties of the final products was investigated, implying their good thermal stability. Through analyzing the response of lifetime to temperature, the thermometric properties of the resultant double perovskites were discussed and the maximum relative sensitivity was 0.32% K −1 , with a broad operating range of 303-623 K. Moreover, in-situ high-pressure X-ray diffraction was tested to explore the structural stability of the studied samples. With elevating pressure, a significant spectral blue-shift was observed in the resulting compounds, enabling their potentials in optical manometry. According to the pressure-dependent emission band centroid, the manometric features of the developed double perovskites were characterized, in which its maximum pressure sensitivity was 10.13 nm GPa −1 with a working pressure range of 0.27-6.69 GPa. Our findings demonstrate that the luminescence properties of Sb 3+ -doped Cs 2 NaScCl 6 double perovskites can be efficiently modulated by extreme condition, endowing their applications in optical temperature and pressure sensing.