Fast-Neutron Scintillation with Multi-Quantum-Well 2D Perovskites
Shaun Tan, Zachary Benesh, Seong Eui Chang, Shelby Elder, Haidi Jakovic, Tae-Woo Lee, Moungi G. Bawendi
Abstract
Fast-neutron scintillators must efficiently convert neutron energy into detectable light while enabling selectivity between neutrons and the γ-ray background. Here, we report a synthesis strategy for layered two-dimensional (2D) lead halide perovskite scintillators with independent control of the macroscopic detector geometry and microscopic phase composition. Our synthesis approach produces mm-thick, large-area scintillators with a deliberately engineered multi-quantum-well energy landscape, creating an effective spectral separation while retaining nanosecond emission dynamics. Our scintillators exhibit an energy resolution of 5.4% at 662 keV under 137Cs irradiation. Under deuterium-deuterium fusion neutron irradiation, we directly demonstrate neutron and γ-ray event separation by pulse shape discrimination, with a figure of merit of 3.51. Taken together, these results establish multi-quantum-well 2D perovskites as a scalable materials platform that combines fast-neutron sensitivity and selectivity within a controllable detector form factor.
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