Photoluminescence and scintillation properties of (C6H5C2H4NH3)2Pb1−xZnxBr4 as a two-dimensional quantum-confined scintillator

Abstract

(C6H5C2H4NH3)2Pb1−xZnxBr4 (x = 0.05, 0.1, and 0.25) single crystals were fabricated as a two-dimensional quantum-confined scintillator by the poor-solvent diffusion method. In the photoluminescence (PL) emission map, two emission peaks due to the excitons in the inorganic layer were observed at around 410 and 440 nm. The PL quantum yields of x = 0.05, 0.1, and 0.25 samples were 21.7, 25.3, and 21.0% with typical errors of ± 2%, respectively. By measuring scintillation spectra under X-ray irradiation, the emission peak due to free excitons can be observed at around 440 nm. According to the pulse-height spectra under 137Cs γ-ray (662 keV) irradiation, the light yields of x = 0.05, 0.1, and 0.25 samples were about 15,100, 17,800, and 14,100 ph/MeV with experimental error of ± 10%, respectively.