Formamidinium Lead Halide Perovskite Nanocomposite Scintillators.
Formamidinium Lead Halide Perovskite Nanocomposite Scintillators.
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DOI：
10.3390/nano12132141
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发表时间：
2022-06-22
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影响因子：
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虽然在各种应用中对有效的、可负担得起的辐射探测器有很大的需求，但许多常用的辐射探测器具有重大缺点。传统的无机发光体具有固定的发射波长，需要昂贵的高温合成;塑料发光体虽然快速，廉价和坚固，但原子序数低，限制了它们的X射线阻止能力。甲脒卤化铅钙钛矿纳米晶体由于其高的X射线衰减系数和明亮的发光而显示出作为发光剂的前景。在这里，我们使用室温下，溶液生长方法来生产混合卤化物FAPbX（X = Cl，Br）纳米晶体，其发射波长可以通过调整卤化物比例在403和531 nm之间变化。溴取代氯量的增加导致具有更快寿命的紫色发射，而溴的更大比例导致具有增加的发光强度的绿色发射。通过将FAPbBr纳米晶体加载到基于PVT的塑料闪烁体基质中，我们制备了1 mm厚的纳米复合闪烁体，其具有比单独的基于PVT的塑料闪烁体更亮的发光。虽然纳米复合材料，如这些通常是不透明的，由于光散射从聚集的纳米粒子，我们使用了表面改性技术，以提高通过复合材料的传输。封装在惰性PMMA中的FAPbBr纳米晶体的复合材料产生甚至更强的发光，其强度比比较FAPbBr/塑料闪烁体复合材料大3.8倍。然而，FAPbBr/PMMA复合材料的发光衰减时间比FAPbBr/塑料闪烁体复合材料慢3倍以上。我们还展示了这些卤化铅钙钛矿纳米复合材料的潜力，用于低成本的X射线成像应用。
While there is great demand for effective, affordable radiation detectors in various applications, many commonly used scintillators have major drawbacks. Conventional inorganic scintillators have a fixed emission wavelength and require expensive, high-temperature synthesis; plastic scintillators, while fast, inexpensive, and robust, have low atomic numbers, limiting their X-ray stopping power. Formamidinium lead halide perovskite nanocrystals show promise as scintillators due to their high X-ray attenuation coefficient and bright luminescence. Here, we used a room-temperature, solution-growth method to produce mixed-halide FAPbX (X = Cl, Br) nanocrystals with emission wavelengths that can be varied between 403 and 531 nm via adjustments to the halide ratio. The substitution of bromine for increasing amounts of chlorine resulted in violet emission with faster lifetimes, while larger proportions of bromine resulted in green emission with increased luminescence intensity. By loading FAPbBr nanocrystals into a PVT-based plastic scintillator matrix, we produced 1 mm-thick nanocomposite scintillators, which have brighter luminescence than the PVT-based plastic scintillator alone. While nanocomposites such as these are often opaque due to optical scattering from aggregates of the nanoparticles, we used a surface modification technique to improve transmission through the composites. A composite of FAPbBr nanocrystals encapsulated in inert PMMA produced even stronger luminescence, with intensity 3.8× greater than a comparative FAPbBr/plastic scintillator composite. However, the luminescence decay time of the FAPbBr/PMMA composite was more than 3× slower than that of the FAPbBr/plastic scintillator composite. We also demonstrate the potential of these lead halide perovskite nanocomposite scintillators for low-cost X-ray imaging applications.
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DOI：
10.1039/c2tc00245k
发表时间：
2013-03-14
期刊：
Journal of materials chemistry. C
影响因子：
--
作者：
Cai W;Chen Q;Cherepy N;Dooraghi A;Kishpaugh D;Chatziioannou A;Payne S;Xiang W;Pei Q
通讯作者：
Pei Q
影响因子：
8.6
作者：
Duong Nguyen Minh;Kim, Juwon;Kang, Youngjong M.
通讯作者：
Kang, Youngjong M.
影响因子：
3.7
作者：
Aygueler, Meltem F.;Weber, Michael D.;Costa, Ruben D.
通讯作者：
Costa, Ruben D.
影响因子：
15
作者：
Kojima, Akihiro;Teshima, Kenjiro;Miyasaka, Tsutomu
通讯作者：
Miyasaka, Tsutomu
影响因子：
3.2
作者：
Fan, Lianwei;Ding, Ke;Wang, Lei
通讯作者：
Wang, Lei