A fast
neutron has strong penetration ability through dense and
bulky objects, which makes it an ideal nondestructive technology for
detecting voids, cracks, or other defects inside large equipment.
However, the lack of effective fast neutron detection materials limits
its application. Perovskites have shown excellent optical properties
in many areas, but they are absent from fast neutron detection imaging
because they cannot directly absorb fast neutrons and emit luminescence.
Here, we demonstrate a hydrogen-rich long-chain organic amine modified
two-dimensional (2D) perovskite fast neutron scintillator, Mn-(C18H37NH3)2PbBr4(Mn-STA2PbBr4). Its hydrogen density can reach
9.51 × 1028 m–3, and the photoluminescence
quantum yield can reach 58.58%, so it is possible to integrate fast
neutron absorption and luminescence into a single compound. More importantly,
Mn-STA2PbBr4 can be made into a large-area self-supporting
fast neutron scintillator plate with satisfactory spatial resolution
(0.5 lp/mm (lp: line pairs)). This strategy provides a simple and
promising choice for fast neutron scintillator nondestructive testing.