Luminescent Lead Halide Ionic Liquids for High-Spatial-Resolution Fast Neutron Imaging,ACS Photonics

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Luminescent Lead Halide Ionic Liquids for High-Spatial-Resolution Fast Neutron Imaging
ACS Photonics ( IF 6.5 ) Pub Date : 2021-10-25 , DOI: 10.1021/acsphotonics.1c01348
Viktoriia Morad _{1,

2} , Kyle M McCall _{1,

2} , Kostiantyn Sakhatskyi _{1,

2} , Eberhard Lehmann ₃ , Bernhard Walfort ₄ , Adrian S Losko ₅ , Pavel Trtik ₃ , Markus Strobl ₃ , Sergii Yakunin _{1,

2} , Maksym V Kovalenko _{1,

2}

Affiliation

The fast neutron imaging technique with recoil proton detection harbors significant potential for imaging of thick, large-scale objects containing high-Z elements. However, the challenge to find efficient fast neutron scintillators with high spatial resolution is ongoing. 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. To meet these challenges, we look for a suitable material among a rising class of 0D organic–inorganic Pb(II) halide hybrids. The use of large organic cations, e.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 (PbX₂ molar fraction up to 0.33) emitting centers. We investigate the optical properties of the resulting ionic liquids and showcase their utility as fast neutron imaging scintillators. 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.

中文翻译：

用于高空间分辨率快速中子成像的发光卤化铅离子液体

具有反冲质子探测功能的快速中子成像技术具有对包含高 Z 元素的厚大尺度物体成像的巨大潜力。然而，寻找具有高空间分辨率的高效快速中子闪烁体的挑战仍在继续。此类闪烁体的要求清单很长而且要求很高：富含质子、无散射的材料，结合了高光输出和无光再吸收。为了应对这些挑战，我们在新兴的 0D 有机-无机 Pb(II) 卤化物杂化物中寻找合适的材料。使用大有机阳离子，例如。例如，三己基十四烷基鏻产生室温离子液体，它结合了高斯托克斯位移（高达 1.7 eV）、无重吸收和有效发射（光致发光量子产率高达 60%）从分子小而密（PbX ₂摩尔）分数高达 0.33) 发射中心。我们研究了所得离子液体的光学特性，并展示了它们作为快速中子成像闪烁体的实用性。伴随着良好的光输出，这种快中子闪烁体与商用 ZnS:Cu 基屏幕相比，具有更高的空间分辨率和更低的 γ 射线灵敏度。

更新日期：2021-11-17

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