Photoluminescence and scintillation properties of organic-inorganic layered perovskite-type compounds (FC6H4C2H4NH3)2PbCl4 crystals

(C6H5C2H4NH3)2PbCl4 and (n-FC6H4C2H4NH3)2PbCl4 (n = 2, 3, and 4) crystals were grown by the slow-cooling method, and the optical and scintillation properties were investigated. From the X-ray diffraction pattern, F-substitution in a benzene ring makes the lattice constant larger than (C6H5C2H4NH3)2PbCl4. They exhibited photoluminescence and scintillation peaks due to the recombination of the self-trapped excitons confined in inorganic layers at 400–700 nm. The afterglow levels at 20 ms after X-ray irradiation for 2 ms were 100–600 ppm. From the pulse height spectra under 241Am α-ray (5.5 MeV) irradiation, the light yields of (C6H5C2H4NH3)2PbCl4, (3-FC6H4C2H4NH3)2PbCl4, and (4-FC6H4C2H4NH3)2PbCl4 samples were calculated to be 1,400, 1,800, and 1,700 ph/5.5 MeV-α.