Abstract
Crystals of organic–inorganic layered perovskite-type compounds with a methoxyphenethylamine (nOCH3-C6H4C2H4NH3)2PbBr4 (n = 2, 3, 4) were synthesized by a temperature gradient method, and their radiation response properties were evaluated for scintillator applications. The perovskite-type compounds with a methoxyphenethylamine exhibited luminescence due to the exciton recombination when excited by ultraviolet light and X-ray. The quantum efficiency (0.12) of the perovskite-type compound with a 4-methoxyphenethylamine was the highest among the fabricated crystals. Furthermore, scintillation light yields of the perovskite-type compounds with a methoxyphenethylamine were evaluated by pulse height spectra using 241Am gamma-ray source. Their obtained yields of (2OCH3–C6H4C2H4NH3)2PbBr4, (3OCH3–C6H4C2H4NH3)2PbBr4, and (4OCH3–C6H4C2H4NH3)2PbBr4 crystals were 3600, 6100 and 11,000 photons/MeV, respectively. In addition, fast decay times on the order of a few nanoseconds under X-ray irradiation were observed in the (2OCH3–C6H4C2H4NH3)2PbBr4 (6.7 ns), (3OCH3–C6H4C2H4NH3)2PbBr4 (4.5 ns), and (4OCH3–C6H4C2H4NH3)2PbBr4 crystals (6.8 ns) owing to the free exciton recombination.
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