Stable and Bright Commercial CsPbBr3 Quantum Dot-Resin Layers for Apparent X-ray Imaging Screen,ACS Applied Materials & Interfaces

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Stable and Bright Commercial CsPbBr3 Quantum Dot-Resin Layers for Apparent X-ray Imaging Screen
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-12-02 , DOI: 10.1021/acsami.1c16171
Francesco Maddalena _{1,

2} , Marcin E Witkowski ₃ , Michal Makowski ₃ , Abdellah Bachiri ₃ , Benoit Mahler ₄ , Ying-Chieh Wong ₅ , Cheng Yi Eric Chua ₅ , Jia Xing Lee ₅ , Winicjusz Drozdowski ₃ , Stuart Victor Springham ₆ , Christophe Dujardin ₄ , Muhammad Danang Birowosuto _{1,

2} , Cuong Dang _{1,

2}

Affiliation

CsPbBr₃ quantum dots (QDs) have recently gained much interest due to their excellent optical and scintillation properties and their potential for X-ray imaging applications. In this study, we blended CsPbBr₃ QDs with resin at different QD concentrations to achieve thick films and to protect the CsPbBr₃ QDs from environmental moisture. Then, their scintillation properties are investigated and compared to the traditional commercial scintillators, CsI:Tl microcolumns, and Gadox layers. The CsPbBr₃ QD-resin sheets show a high light yield of up to 21 500 photons/MeV at room temperature and a relatively small variation in light yield across a wide temperature range. In addition, the CsPbBr₃ QD-resin sheets feature a small scintillation afterglow. The CsPbBr₃ QD-resin sheets show a negligible trap density for the concentration below 50% weight, indicating that traps might arise from the aggregation of the QDs. The CsPbBr₃ QD-resin sheets are also very stable at low irradiation intensities and relatively stable at higher intensities, with higher CsPbBr₃ QD concentrations being more stable. Gamma-ray-excited-time-resolved emission measurements at 662 keV showed that the CsPbBr₃ QD-resin sheets have an average scintillation decay time between 108 and 176 ns, which are still 10 000 and 6000 times faster than CsI:Tl and Gadox, respectively. Imaging tests show that the CsPbBr₃ QD-resin sheets have a mean transfer function of 50% at 2 lp/mm and 20% at 4 lp/mm, comparable to that of commercial Gadox layers. This feature makes CsPbBr₃ QD-resin sheets a good candidate for the low-cost, flexible X-ray imaging screens and γ-ray applications.

中文翻译：

用于表观 X 射线成像屏幕的稳定且明亮的商用 CsPbBr3 量子点树脂层

CsPbBr ₃量子点 (QD) 由于其出色的光学和闪烁特性以及它们在 X 射线成像应用中的潜力，最近引起了人们的极大兴趣。在这项研究中，我们将 CsPbBr ₃量子点与不同量子点浓度的树脂混合，以获得厚膜并保护 CsPbBr ₃量子点免受环境水分的影响。然后，研究它们的闪烁特性，并将其与传统的商业闪烁器、CsI:Tl 微柱和 Gadox 层进行比较。CsPbBr ₃ QD 树脂片在室温下显示出高达 21 500 光子/MeV 的高光输出，并且在很宽的温度范围内光输出的变化相对较小。此外，CsPbBr ₃QD 树脂片具有小的闪烁余辉。CsPbBr ₃ QD 树脂片显示浓度低于 50% 重量的陷阱密度可以忽略不计，表明陷阱可能由 QD 的聚集产生。CsPbBr ₃ QD 树脂片在低辐照强度下也非常稳定，在较高强度下相对稳定，CsPbBr ₃ QD 浓度越高越稳定。662 keV 的伽马射线激发时间分辨发射测量表明，CsPbBr ₃ QD 树脂片的平均闪烁衰减时间在 108 到 176 ns 之间，仍然比 CsI:Tl 和 Gadox 快 10 000 到 6000 倍，分别。成像测试表明 CsPbBr ₃QD 树脂片的平均传递函数在 2 lp/mm 时为 50%，在 4 lp/mm 时为 20%，与商业 Gadox 层相当。这一特性使 CsPbBr ₃ QD 树脂片成为低成本、灵活的 X 射线成像屏幕和 γ 射线应用的理想选择。

更新日期：2021-12-15

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