Scintillation in (C6H5CH2NH3)2SnBr4: green-emitting lead-free perovskite halide materials

We report the optical and scintillation properties of (C6H5CH2NH3)(2)SnBr4 with excellent absorption length at 20 keV of 0.016 cm, measured bandgap of 2.51 eV, and photoluminescence lifetime of 1.05 mu s. The light yield obtained with the Am-241 source is 3600 +/- 600 photons per MeV, which is much smaller than the maximum attainable light yield obtained from the bandgap. Temperature dependent radioluminescence measurements confirm the presence of thermal quenching at room temperature with the activation energy and the ratio between the attempt and the radiative transition rates of 61 meV and 129, respectively. Although thermal quenching affects light yield at room temperature, this green light-emitting perovskite opens an avenue for new lead-free scintillating materials.

Automated summary

The optical and scintillation properties of (C6H5CH2NH3)(2)SnBr4 were reported, showing excellent absorption length and measured bandgap. Despite thermal quenching, this green light-emitting perovskite opens up possibilities for new lead-free scintillating materials.