Scintillation properties of organic-inorganic layered perovskite nanocrystals in glass

We fabricated organic-inorganic perovskite nanocrystals in nanoporous glasses (OIPiG) where (C6H5C2H4NH3)(2)PbBr4 (Phe) was incorporated into about 4nm diameter pores and evaluated their photoluminescence and scintillation properties, compared with the Phe single crystal. Both the samples showed emissions due to the recombination of free excitons in the inorganic layer under 280nm excitation light. In scintillation, a weak and broad scintillation peak possibly due to the free excitons and bound excitons was observed in the OIPiG, while the Phe single crystal showed efficient scintillation due to free exciton emissions with a peak approximately at 435nm. The scintillation decay time constant (4.4ns) due to the free excitons for the OIPiG was found to be faster than that (6.6ns) for the Phe single crystal. In addition, the afterglow levels were confirmed to be 340ppm for the OIPiG and 20ppm for the Phe single crystal. The afterglow level of the OIPiG was higher than that of the Phe single crystal but was almost equivalent to that for the commonly used inorganic scintillator CsI:Tl.