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Structure-Function Integration in 2D Hybrid Perovskite for Fast Neutron and Gamma Ray Discrimination #MMPMID41391044
Wang Y; Xu L; Liu C; Liang L; Zhang B; Qin Z; Lian L; Zheng W; Lei Y; Hu Q; Song S; Mi C; Wang T; Xu Y; Zha G; Jie W
Adv Sci (Weinh) 2025[Dec]; ? (?): e18905 PMID41391044show ga
Efficient discrimination between fast neutrons and gamma rays is crucial yet challenging for radiation detection. Here, the successful growth of large-size, high-quality 2D organic-inorganic hybrid perovskite single crystals, (GABA)(2)PbBr(4), via an in situ seed-assisted cooling method is reported. This material integrates hydrogen-rich GABA cations with heavy-atom lead halide layers, offering strong excitonic emission, efficient gamma-ray absorption, and fast neutron sensitivity. X-ray diffraction reveals highly oriented crystals along the (004) plane with a narrow full width at half maximum (FWHM) of 12.81''. Optical characterizations indicate a wide bandgap ( approximately 3.0 eV), sharp excitonic emission, and prominent self-trapped exciton behavior, supported by transient and temperature-dependent photoluminescence. The crystals exhibit an energy resolution of 9.0% at 662 keV and a high light yield of 10 695 ph MeV(-1). Notably, superior neutron/gamma pulse shape discrimination (PSD) is achieved with a maximum figure-of-merit (FOM) of 1.74, enabling clear signal separation. Additionally, flexible composite scintillation films based on (GABA)(2)PbBr(4) demonstrate high-resolution X-ray imaging up to 10 LP mm(-1). These results highlight the potential of (GABA)(2)PbBr(4) as a multifunctional scintillator for advanced radiation detection and imaging applications.
Adv+Sci+(Weinh) 2025 ; ? (?): e18905
