Scintillation performance of two-dimensional perovskite (BA)₂PbBr₄microcrystals

Radiation detection based on scintillators is widely utilized for medical diagnosis and security checks. Recently, two-dimensional (2D) halide perovskites have been demonstrated as highly promising scintillators due to their high exciton binding energy, their moisture stability and low-temperature fabrication. Herein, a solution temperature-lowering (STL) growth method is used to fabricate 2D butylammonium lead bromide (BA2PbBr4) perovskite microcrystals. The BA2PbBr4 microcrystals exhibit a highly competitive radioluminescence emission at 427 nm, a fast decay time of 2.52 ns, a low detectable limit of 318.3 nGyair per s, a moderate light yield of about 7000 photons per MeV and outstanding moisture stability. Additionally, it is of note that the light yield of BA2PbBr4 microcrystals is sixfold higher than that of the plastic scintillator EJ228 under alpha excitation. These results indicate that BA2PbBr4 microcrystals show great potential as a versatile scintillator.