Tailoring the electron and hole dimensionality to achieve efficient and stable metal halide perovskite scintillators

Abstract

Metal halide perovskites have recently been reported as excellent scintillators for X-ray detection. However, perovskite based scintillators are susceptible to moisture and oxygen atmosphere, such as the water solubility of CsPbBr 3 , and oxidation vulnerability of Sn 2+ , Cu + . The traditional metal halide scintillators (NaI: Tl, LaBr 3 , etc.) are also severely restricted by their high hygroscopicity. Here we report a new kind of lead free perovskite with excellent water and radiation stability, Rb 2 Sn 1- x Te x Cl 6 . The equivalent doping of Te could break the in-phase bonding interaction between neighboring octahedra in Rb 2 SnCl 6 , and thus decrease the electron and hole dimensionality. The optimized Te content of 5% resulted in high photoluminescence quantum yield of 92.4%, and low X-ray detection limit of 0.7 µGy air s −1 . The photoluminescence and radioluminescence could be maintained without any loss when immersing in water or after 480,000 Gy radiations, outperforming previous perovskite and traditional metal halides scintillators.