The perfect scintillator for this indirect detection scheme should be a scattering-free, proton-rich, and high-light-yield material with a dense concentration of (preferably atomically small) fast emitting centers.Īs the-state-of-art fast neutron scintillators face their own challenges, (2) researchers start to divert their course toward ns 2-metal halides, (3) a rapidly expanding class of optoelectronic materials with promising applications in high-energy detection. However, the potential of this method depends on the exploration of efficient scintillator materials. The kinetic energy of these recoil nuclei is then deposited as ionized charge carriers in the detector material, which can excite a scintillator to emit visible-range photons detectable by conventional imaging devices such as a CCD camera. (1) The primary method for fast neutron detection is based on elastic scattering of neutrons by nuclei, generating recoil nuclei (typically protons) with very small penetration depths (up to tens of micrometers) in the detector material. Concomitantly with good light yield, such fast-neutron scintillators exhibit both higher spatial resolution and lower γ-ray sensitivity compared with commercial ZnS:Cu-based screens.Īs opposed to thermal neutrons with relatively low penetration depth or high-energy X-rays with insufficient low-Z element contrast, fast neutrons (1–15 MeV) are the tool of choice for imaging thick objects containing both high- and low-Z elements. We investigate the optical properties of the resulting ionic liquids and showcase their utility as fast neutron imaging scintillators. g., trihexyltetradecylphosphonium, results in room-temperature ionic liquids that combine highly Stokes-shifted (up to 1.7 eV), reabsorption-free, and efficient emission (photoluminescence quantum yield up to 60%) from molecularly small and dense (PbX 2 molar fraction up to 0.33) emitting centers. To meet these challenges, we look for a suitable material among a rising class of 0D organic–inorganic Pb(II) halide hybrids. The list of requirements for such scintillators is long and demanding: a proton-rich, scattering-free material combining high light yield with the absence of light reabsorption. However, the challenge to find efficient fast neutron scintillators with high spatial resolution is ongoing. The fast neutron imaging technique with recoil proton detection harbors significant potential for imaging of thick, large-scale objects containing high-Z elements.
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December 2022
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