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学者姓名：肖家文
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摘要 ：
Lead-halide perovskites have received extensive attention in X-ray imaging applications recently. However, their poor stability, lead toxicity, and strong light self-absorption seriously limit the commercial development. Here, we report a vacancy-ordered Cs2HfCl6 double perovskite for scintillators applications. The Cs2HfCl6 microcrystals (MCs) are characterized by broadband blue emission with a large Stokes shift. Joined experimental-theoretical characterizations reveal the highly localized charge distribution in Cs2HfCl6 and structural distortion of [HfCl6](2-) octahedron in the excited state favor the formation of self-trapped excitons (STEs), which contribute to the broadband emission. Benefiting from the radioluminescence of STEs with negligible self-absorption, the light yield of Cs2HfCl6 scintillator reaches 21700 photons/MeV, and the detection limit is 55 nGy(air) s(-1). Additionally, the Cs2HfCl6 scintillator exhibits extremely low hygroscopicity and good resistance to X-ray irradiation. Further, a large-area scintillator screen (20x20 cm(2)) is fabricated by combining scrape-coating and soft-pressing techniques, showing a spatial resolution of 11.2 lp mm(-1). Given the high spatial resolution and fast light decay of this scintillator screen, static X-ray imaging of bulky objects is realized, and dynamic X-ray imaging of a rotating chopping fan is demonstrated without ghosting effects. These results demonstrate the great commercial promise of Cs2HfCl6 scintillation screens for indirect X-ray detection.
关键词 ：
scintillator screens scintillator screens cesium hafnium chloride cesium hafnium chloride large-area large-area X-ray imaging X-ray imaging stability stability
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| GB/T 7714 | Zhang, Fei , Zhou, Yingchun , Chen, Zhipeng et al. Large-Area X-Ray Scintillator Screen Based on Cesium Hafnium Chloride Microcrystals Films with High Sensitivity and Stability [J]. | LASER & PHOTONICS REVIEWS , 2023 , 17 (5) . |
| MLA | Zhang, Fei et al. "Large-Area X-Ray Scintillator Screen Based on Cesium Hafnium Chloride Microcrystals Films with High Sensitivity and Stability" . | LASER & PHOTONICS REVIEWS 17 . 5 (2023) . |
| APA | Zhang, Fei , Zhou, Yingchun , Chen, Zhipeng , Niu, Xiaowei , Wang, Heyong , Jia, Mochen et al. Large-Area X-Ray Scintillator Screen Based on Cesium Hafnium Chloride Microcrystals Films with High Sensitivity and Stability . | LASER & PHOTONICS REVIEWS , 2023 , 17 (5) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The incorporation of lanthanide ions (Ln(3+)) has been shown to be an effective strategy to tune the luminescence properties in lead-free halide double perovskites. However, most Ln(3+)-doped double perovskites exhibit a low luminescence efficiency and a high excitation energy and/or require doping with multiple ions which result in complex compositions. Herein, we demonstrate that the Ln(3+) doping (Ln = Yb, Er, Nd) in the layered double perovskite Cs4MnBi2Cl12 enables multimodal luminescence, that is, the orange-red emission from the d-d transition of Mn2+, the efficient ultraviolet light excited near-infrared (NIR) emissions of Ln(3+) and the upconversion emissions in both Yb- and Yb/Er-doped systems. In addition, the NIR emissions of Ln(3+) can also be excited by blue and green light benefiting from the energy transfer from Mn2+ to Ln(3+). Finally, taking advantage of the multimodal luminescence in the Ln(3+)-doped Cs4MnBi2Cl12 phosphor, a preliminary anti-counterfeiting application is demonstrated. We highlight that the particular chemical composition (comprising Bi3+ and Mn2+) and the sandwich-type Bi-Mn-Bi layered crystal structure facilitate the light absorption and the energy transfer from Bi3+ to Ln(3+) and Mn2+ to Ln(3+), demonstrating the importance of the rational selection and design of double perovskite host materials for Ln(3+) doping.
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| GB/T 7714 | Li, Jingyu , Xiao, Jiawen , Lin, Taifeng et al. Lanthanide doping enabled multimodal luminescence in layered lead-free double perovskite Cs4MnBi2Cl12 [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (19) : 7626-7632 . |
| MLA | Li, Jingyu et al. "Lanthanide doping enabled multimodal luminescence in layered lead-free double perovskite Cs4MnBi2Cl12" . | JOURNAL OF MATERIALS CHEMISTRY C 10 . 19 (2022) : 7626-7632 . |
| APA | Li, Jingyu , Xiao, Jiawen , Lin, Taifeng , Yan, Zhengguang , Han, Xiaodong . Lanthanide doping enabled multimodal luminescence in layered lead-free double perovskite Cs4MnBi2Cl12 . | JOURNAL OF MATERIALS CHEMISTRY C , 2022 , 10 (19) , 7626-7632 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Low-dimensional perovskite halides have shown a great potential as X-ray detection materials because of efficient exciton emissions originating from strongly spatially localized charge carriers. Nonetheless, most of them have a scintillation yield far below their theoretical limits. Here, it is found that the harvesting efficiency of produced charge carriers can be significantly enhanced via a small amount of In+ doping in these highly localized structures. A bright and sensitive zero-dimensional Cs3Cu2I5:In+ halide with efficient and tunable dual emission is reported. The radioluminescence emission of Cs3Cu2I5:In+ crystals under X-ray excitation consists of a self-trapped exciton emission at 460 nm and an In+-related emission at 620 nm at room temperature. In+ doping enhances the photoluminescence quantum efficiency (PLQY) of Cs3Cu2I5 from 68.1% to 88.4%. Benefiting from the higher PLQY, Cs3Cu2I5:In+ can achieve an excellent X-ray detection limit of 96.2 nGy(air ) s(-1), and a superior scintillation yield of 53 000 photons per MeV, which is comparable to commercial CsI:Tl single crystals. As a result, a remarkable X-ray imaging resolution of 18 line pairs mm(-1) is demonstrated, which is so far a record resolution for single crystal perovskite-based flat-panel detectors. These results highlight the importance of efficient harvesting of carriers (and excitons) in low-dimensional perovskites for radiation detection applications.
关键词 ：
X-ray imaging X-ray imaging low-dimensional perovskite low-dimensional perovskite scintillator scintillator single crystal single crystal
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| GB/T 7714 | Wang, Qian , Zhou, Quan , Nikl, Martin et al. Highly Resolved X-Ray Imaging Enabled by In(I) Doped Perovskite-Like Cs3Cu2I5 Single Crystal Scintillator [J]. | ADVANCED OPTICAL MATERIALS , 2022 , 10 (11) . |
| MLA | Wang, Qian et al. "Highly Resolved X-Ray Imaging Enabled by In(I) Doped Perovskite-Like Cs3Cu2I5 Single Crystal Scintillator" . | ADVANCED OPTICAL MATERIALS 10 . 11 (2022) . |
| APA | Wang, Qian , Zhou, Quan , Nikl, Martin , Xiao, Jiawen , Kucerkova, Romana , Beitlerova, Alena et al. Highly Resolved X-Ray Imaging Enabled by In(I) Doped Perovskite-Like Cs3Cu2I5 Single Crystal Scintillator . | ADVANCED OPTICAL MATERIALS , 2022 , 10 (11) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Flexible scintillator screens with environmental stability, high sensitivity, and low cost have emerged as candidates for X-ray imaging applications. Here, a large-scale and cost-efficient solution synthesis of the vacancy-ordered double perovskite Cs2ZrCl6, which is characterized by thermal activation delayed fluorescence (TADF) dominated by triplet emission under X-ray irradiation, is demonstrated. The large Stokes shift and efficient luminescence collection of TADF effectively ensure the light outcoupling efficiency. Further, flexible X-ray scintillator screens with an area of 400 cm(2) are prepared using poly(dimethylsiloxane) (PDMS) as the carrier, exhibiting excellent scintillation properties with light yields as high as 49 400 photons MeV-1, spatial resolutions up to 18 lp mm(-1) and detection limits as low as 65 nGy s(-1). Finally, the high-quality imaging results of non-planar and dynamic objects by such screens are demonstrated. It is believed that the explored Cs2ZrCl6@PDMS flexible scintillator screens would offer a big step toward expanding the application range of scintillators in different environments.
关键词 ：
2ZrCl 2ZrCl large-area screens large-area screens (6) (6) Cs Cs stability stability flexible X-ray scintillator screens flexible X-ray scintillator screens thermal activation delay fluorescence thermal activation delay fluorescence
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| GB/T 7714 | Zhang, Fei , Zhou, Yingchun , Chen, Zhipeng et al. Thermally Activated Delayed Fluorescence Zirconium-Based Perovskites for Large-Area and Ultraflexible X-ray Scintillator Screens [J]. | ADVANCED MATERIALS , 2022 , 34 (43) . |
| MLA | Zhang, Fei et al. "Thermally Activated Delayed Fluorescence Zirconium-Based Perovskites for Large-Area and Ultraflexible X-ray Scintillator Screens" . | ADVANCED MATERIALS 34 . 43 (2022) . |
| APA | Zhang, Fei , Zhou, Yingchun , Chen, Zhipeng , Wang, Meng , Ma, Zhuangzhuang , Chen, Xu et al. Thermally Activated Delayed Fluorescence Zirconium-Based Perovskites for Large-Area and Ultraflexible X-ray Scintillator Screens . | ADVANCED MATERIALS , 2022 , 34 (43) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
<正>近年来以卤化铅钙钛矿为代表的金属卤化物由于其优异的光电性质、光电器件性能备受研究者们的关注~1。金属卤化物除了在光伏、发光与显示、光电探测、激光等领域的应用前景突出,在高能射线探测与成像领域也逐渐引起人们的关注~(2-3)。本研究探讨了一类非铅铜(Ⅰ)基卤化物的合成及其闪烁体应用潜力。研究发现所合成的铜(Ⅰ)基卤化物具有高发光量子产率(>90%)、大的stokes位移等优点,其在X射线激发下产生明亮的可见光发射,
关键词 ：
卤化物 卤化物 闪烁体 闪烁体 射线成像 射线成像
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| GB/T 7714 | 肖家文 . 铜基卤化物闪烁体的合成及其X射线成像研究 [C] //第二届全国光电材料与器件学术研讨会摘要集 . 2021 . |
| MLA | 肖家文 . "铜基卤化物闪烁体的合成及其X射线成像研究" 第二届全国光电材料与器件学术研讨会摘要集 . (2021) . |
| APA | 肖家文 . 铜基卤化物闪烁体的合成及其X射线成像研究 第二届全国光电材料与器件学术研讨会摘要集 . (2021) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Progress towards high performance X-ray detection and dynamic imaging applications, including nondestructive inspection, homeland security, and medical diagnostics, requires scintillators with a high light yield, a reasonable decay time, low cost, and eco-friendliness. Recently, copper halide scintillators have drawn tremendous attention due to their outstanding radioluminescence performance. Here, we first employed beta-Cs3Cu2Cl5 as a high-performance scintillator, with a photoluminescence quantum yield (PLQY) of 94.6%, a radioluminescence light yield of 34 000 +/- 4000 photons per MeV, a low detection limit of 81.7 nGy(air) s(-1), and good operational stability under a total X-ray dose of 174.6 Gy(air) in air. In addition, this scintillator presents a high spatial resolution of 9.6 lp mm(-1) at the modulation transfer function of 0.2 and a superb performance at 60 frames per second in our X-ray imaging system. Overall, this highly efficient scintillator demonstrates outstanding comprehensive performance and shows great potential for broad applications in X-ray detection and dynamic imaging.
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| GB/T 7714 | Zhou, Quan , Ren, Jiwei , Xiao, Jiawen et al. Highly efficient copper halide scintillators for high-performance and dynamic X-ray imaging [J]. | NANOSCALE , 2021 , 13 (47) : 19864-19902 . |
| MLA | Zhou, Quan et al. "Highly efficient copper halide scintillators for high-performance and dynamic X-ray imaging" . | NANOSCALE 13 . 47 (2021) : 19864-19902 . |
| APA | Zhou, Quan , Ren, Jiwei , Xiao, Jiawen , Lei, Lin , Liao, Feiyi , Di, Haipeng et al. Highly efficient copper halide scintillators for high-performance and dynamic X-ray imaging . | NANOSCALE , 2021 , 13 (47) , 19864-19902 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The low-dimensional halide perovskites have received enormous attention due to their unique photovoltaic and optoelectronic performances. Periodic spacers are used to inhibit the growth of 3D perovskite and fabricate a 2D counterpart with layered structure, mostly based on organic/inorganic cations. Herein, by introducing organic anions (e.g., pentanedioic acid (PDA) and hexanedioic acid (HDA) simultaneously), leaf-shaped (Cs3Pb2Br5)(2)(PDA-HDA) microplates with low-dimensional structure are synthesized. They also exhibit significant photoluminescence (PL) centered at 540 nm with a narrow emission peak. The synthesis of single crystals of Pb(PDA) and Pb(HDA) allows to further clarify the crystal structure of (Cs3Pb2Br5)(2)(PDA-HDA) perovskite and its structural evolution mechanism. Moreover, the cooperative introduction of dicarboxylic acid pairs with appropriate lengths is thermodynamically favored for the low-dimensional perovskite crystallization. The temperature-dependent PL indicates a V-shaped Stokes shift with elevated temperature that could be associated with the localization of excitons in the inorganic layers between organic dicarboxylic acid molecules. This work demonstrates low-dimensional halide perovskite with anionic spacers, which also opens up a new approach to the growth of low-dimensional organic-inorganic hybrid perovskite crystals.
关键词 ：
halide perovskites halide perovskites low-dimensional materials low-dimensional materials nanocrystals nanocrystals photoluminescence photoluminescence
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| GB/T 7714 | Zhao, Yizhou , Zhang, Siyu , Lu, Yue et al. A Strategy toward New Low-Dimensional Hybrid Halide Perovskites with Anionic Spacers [J]. | SMALL , 2019 , 15 (6) . |
| MLA | Zhao, Yizhou et al. "A Strategy toward New Low-Dimensional Hybrid Halide Perovskites with Anionic Spacers" . | SMALL 15 . 6 (2019) . |
| APA | Zhao, Yizhou , Zhang, Siyu , Lu, Yue , Lan, Shangui , Zhu, Cheng , Xiao, Jiawen et al. A Strategy toward New Low-Dimensional Hybrid Halide Perovskites with Anionic Spacers . | SMALL , 2019 , 15 (6) . |
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