Organic–inorganic lead bromide perovskite-type crystals (HOC n H 2n NH 3 ) 2 PbBr 4 (CnOH, n = 2, 3, 4, 5) were prepared, and their luminescence properties were examined. A free exciton emission was observed, and the quantum yield of the C3OH crystal was the highest. A luminescent peak owing to exciton emissions was also observed under excitation by X-ray, and the first scintillation decay component showed lifetimes of 1.7–4.5 ns. Furthermore, their scintillation light yields under α-ray were obtained, being 380 photons/5.5MeV-α for the C2OH crystal, 2000 photons/5.5MeV-α for the C3OH crystal, 1900 photons/5.5MeV-α for the C4OH crystal, and 470 photons/5.5MeV-α for the C5OH crystal. The highest light yield under α-ray was observed from the C3OH (2000 photons/5.5MeV-α). Moreover, the scintillation light yield was obtained from only the C3OH crystal under γ-ray, and its light yield was 2700 photons/MeV. • Luminescent performance of organic–inorganic perovskite-type compounds with a hydroxyalkylamine was investigated. • The fabricated crystals showed a fast scintillation decay time due to free excitons. • The (HOC 3 H 6 NH 3 ) 2 PbBr 4 crystal showed the highest quantum yield and scintillation light yield.
Tsubokawa et al. (Wed,) studied this question.