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学者姓名：肖家文
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Abstract ：
The urgency for cost-effective, high-resolution, flexible X-ray imaging detectors is generating great demand for scintillators with low-temperature processability, high scintillation yield, and negligible afterglow. X-ray imaging materials are currently dominated by inorganic scintillators in the form of rigid films and bulk crystals, which have inherent limitations including high-temperature, complex synthesis, and considerable challenges toward advanced nonplanar imaging. Here, high-performance and flexible X-ray scintillators based on novel zero-dimensional (0D) (BTPP)2MnX4 (BTPP = benzyltriphenylphosphonium; X = Cl, Br) halides are reported. They emit bright green light originating from the 4T1-6A1 transition of Mn2+ under X-ray excitation. In particular, (BTPP)2MnBr4 single crystals exhibit excellent air- and radiation-stability, a high scintillation yield of 53 000 photons MeV-1, a low detection limit of 89.9 nGyair s-1, and an ultralow afterglow comparable to commercial Bi4Ge3O12 (BGO) single crystals. Moreover, the (BTPP)2MnCl4@polydimethylsiloxane (PDMS) flexible scintillation screens achieve a high spatial resolution of 14.1 lp mm-1 and realize high-quality imaging results of nonplanar objects. This study demonstrates that the flexible scintillation screens based on low-dimensional Mn(II) hybrid halides have significant potential for low-dose and high-resolution X-ray imaging applications. The green-emitting (BTPP)2MnX4 (X = Cl, Br) flexible scintillation screens demonstrate high scintillation yield, decent X-ray detection limit, ultralow afterglow, high radiation resistance, superior imaging spatial resolution, and high-quality imaging results for both planar and nonplanar imaging objects. These results highlight the great potential of developing low-dimensional Mn(II) hybrid halides for X-ray detection and imaging applications.image
Keyword ：
hybrid scintillators hybrid scintillators manganese halides manganese halides scintillation screens scintillation screens X-ray imaging X-ray imaging
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| GB/T 7714 | Li, Wen , Li, Yunyun , Wang, Ying et al. Highly Efficient and Flexible Scintillation Screen Based on Organic Mn(II) Halide Hybrids toward Planar and Nonplanar X-Ray Imaging [J]. | LASER & PHOTONICS REVIEWS , 2023 , 18 (2) . |
| MLA | Li, Wen et al. "Highly Efficient and Flexible Scintillation Screen Based on Organic Mn(II) Halide Hybrids toward Planar and Nonplanar X-Ray Imaging" . | LASER & PHOTONICS REVIEWS 18 . 2 (2023) . |
| APA | Li, Wen , Li, Yunyun , Wang, Ying , Zhou, Zhengyang , Wang, Chao , Sun, Yiyang et al. Highly Efficient and Flexible Scintillation Screen Based on Organic Mn(II) Halide Hybrids toward Planar and Nonplanar X-Ray Imaging . | LASER & PHOTONICS REVIEWS , 2023 , 18 (2) . |
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Abstract ：
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.
Keyword ：
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) . |
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Abstract ：
The low efficiency triplet emission of hybrid copper(I) iodide clusters is a critical obstacle to their further practical optoelectronic application. Herein, we present an efficient hybrid copper(I) iodide cluster emitter (DBA)(4)Cu4I4, where the cooperation of excited state structure reorganization and the metallophilicity interaction enables ultra-bright triplet yellow-orange emission with a photoluminescence quantum yield over 94.9 %, and the phonon-assisted de-trapping process of exciton induces the negative thermal quenching effect at 80-300 K. We also investigate the potential of this emitter for X-ray imaging. The (DBA)(4)Cu4I4 wafer demonstrates a light yield higher than 10(4) photons MeV-1 and a high spatial resolution of approximate to 5.0 lp mm(-1), showing great potential in practical X-ray imaging applications. Our new copper(I) iodide cluster emitter can serve as a model for investigating the thermodynamic mechanism of photoluminescence in hybrid copper(I) halide phosphorescence materials.
Keyword ：
X-Ray Imaging X-Ray Imaging Efficient Triplet Phosphorescence Efficient Triplet Phosphorescence Negative Thermal Quenching Negative Thermal Quenching Copper(I) Cluster Copper(I) Cluster
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| GB/T 7714 | Hu, Qingsong , Zhang, Chengkai , Wu, Xian et al. Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging [J]. | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2023 , 62 (11) . |
| MLA | Hu, Qingsong et al. "Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging" . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 62 . 11 (2023) . |
| APA | Hu, Qingsong , Zhang, Chengkai , Wu, Xian , Liang, Guijie , Wang, Lei , Niu, Xiaowei et al. Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2023 , 62 (11) . |
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Abstract ：
卤化物钙钛矿材料由于其优异的光电性质成为近几年的研究热点之一。钙钛矿太阳能电池的光电转换效率在短短几年内已超过25%，钙钛矿材料在光电二极管、光电探测器、激光器等光电器件中也表现出良好的应用前景。钙钛矿材料及器件性能的进一步提高和稳定性提升是研究人员重点关注的问题。各种改善钙钛矿材料的光电性质和稳定性的策略也被不断提出，其中，应变工程被发现可有效改善钙钛矿材料的光电性质和器件性能，为钙钛矿材料器件性能的优化提供了新的研究视角。本文从应力应变的基本概念入手，介绍应力应变如何影响钙钛矿材料的器件性能，以及总结了对钙钛矿材料施加应力应变的策略，最后本文对应变工程改善钙钛矿材料的器件性能这一新的研究视...
Keyword ：
稳定性 稳定性 光电性质 光电性质 卤化物钙钛矿 卤化物钙钛矿 应力应变 应力应变
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| GB/T 7714 | 王超 , 严铮洸 , 肖家文 . 应变工程对钙钛矿材料光电性质和稳定性的调制 [J]. | 材料导报 , 2022 , (17) : 1-22 . |
| MLA | 王超 et al. "应变工程对钙钛矿材料光电性质和稳定性的调制" . | 材料导报 17 (2022) : 1-22 . |
| APA | 王超 , 严铮洸 , 肖家文 . 应变工程对钙钛矿材料光电性质和稳定性的调制 . | 材料导报 , 2022 , (17) , 1-22 . |
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Abstract ：
Copper-based lead-free perovskite derivatives have recently drawn great attention for their excellent optoelectronic properties and potential applications in light-emitting diodes (LEDs) and photodetectors. Herein, facile synthesis methods of cooling crystallization and wet ball milling (WBM) are adopted to synthesize K2CuCl3, resulting in single crystals (SCs) and powder samples, respectively. The as-fabricated K2CuCl3 samples exhibit blue-violet emission, with the highest photoluminescence quantum yield (PL QY) of 70% (under 280 nm excitation), and the photoluminescence (PL) is attributed to the self-trap excitons (STEs) emission. We also test the scintillation properties of K2CuCl3 for X-ray detection and imaging applications. A down-conversion LED is finally made by using K2CuCl3 as phosphor. [GRAPHICS] .
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| GB/T 7714 | Zhang, Fa , Lin, Zhengguo , Xie, Lingling et al. Blue-violet emitting K2CuCl3 compound: facile synthesis, photoluminescence and radioluminescence properties [J]. | JOURNAL OF MATERIALS SCIENCE , 2022 , 57 (22) : 10260-10270 . |
| MLA | Zhang, Fa et al. "Blue-violet emitting K2CuCl3 compound: facile synthesis, photoluminescence and radioluminescence properties" . | JOURNAL OF MATERIALS SCIENCE 57 . 22 (2022) : 10260-10270 . |
| APA | Zhang, Fa , Lin, Zhengguo , Xie, Lingling , Li, Xitao , Lu, Bingheng , Zhao, Ziheng et al. Blue-violet emitting K2CuCl3 compound: facile synthesis, photoluminescence and radioluminescence properties . | JOURNAL OF MATERIALS SCIENCE , 2022 , 57 (22) , 10260-10270 . |
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Abstract ：
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.
Keyword ：
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) . |
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Abstract ：
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 . |
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Abstract ：
Recently, doped ternary zinc halides with high photoluminescence quantum yields (PLQYs) have demonstrated great potential in light emitting applications. However, the composition-dependent photophysical properties of ternary zinc halides have not been investigated, and their X-ray scintillation performances remain unexplored. Here, a compositional engineering strategy for highly efficient Cu+-doped zero-dimensional A(2)ZnX(4) (A = Rb, Cs; X = Cl, Br) blue emitters is presented. It is found that the A-site cations show a negligible influence on the emission spectra of both pure A(2)ZnX(4) and Cu+-doped A(2)ZnX(4), while the change of the halide anion slightly shifts the emission peak of doped A(2)ZnX(4). The detailed photoluminescence (PL) studies indicate that the emission of Cu+-doped A(2)ZnX(4) may come from two self-trapped exciton (STE) emission centers, namely Zn-related and Cu-related STEs. An energy transfer process from the Zn-related STE to the Cu-related STE is proposed. Based on the composition dependent photophysical and scintillation property study, Cu+-doped Cs2ZnBr4 is found to show the best scintillation performance among these zinc halides. Cu+-doped Cs2ZnBr4 shows a relatively high light yield of similar to 10 000 photons MeV-1, a low detection limit of 57 nGy(air) s(-1), and good radiation stability. The X-ray imaging results based on a doped Cs2ZnBr4 scintillation screen show a high spatial resolution of up to 9 line pairs per millimeter. These results demonstrate that the doped Cs2ZnBr4 scintillator could be a potential candidate for sensitive X-ray detection and imaging.
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| GB/T 7714 | Zhou, Yingchun , Zhou, Quan , Niu, Xiaowei et al. Compositional engineering of doped zero-dimensional zinc halide blue emitters for efficient X-ray scintillation [J]. | INORGANIC CHEMISTRY FRONTIERS , 2022 , 9 (12) : 2987-2996 . |
| MLA | Zhou, Yingchun et al. "Compositional engineering of doped zero-dimensional zinc halide blue emitters for efficient X-ray scintillation" . | INORGANIC CHEMISTRY FRONTIERS 9 . 12 (2022) : 2987-2996 . |
| APA | Zhou, Yingchun , Zhou, Quan , Niu, Xiaowei , Yan, Zhengguang , Lin, Taifeng , Xiao, Jiawen et al. Compositional engineering of doped zero-dimensional zinc halide blue emitters for efficient X-ray scintillation . | INORGANIC CHEMISTRY FRONTIERS , 2022 , 9 (12) , 2987-2996 . |
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Abstract ：
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.
Keyword ：
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) . |
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Abstract ：
Lead-based halide perovskite nanomaterials with excellent optical properties have aroused great attention in the fields of solar cells, light-emitting diodes, lasing, X-ray imaging, etc. However, the toxicity of lead prompts researchers to develop alternatives to cut down the usage of lead. Herein, all-inorganic manganese-based perovskite derivatives, CsMnCl3 nanocrystals (NCs), with uniform size and morphology have been synthesized successfully via a modified hot-injection method. These NCs have a direct bandgap of 4.08 eV and a broadband emission centered at 660 nm. Through introducing modicum lead (1%) into the CsMnCl3 NCs, the photoluminescence intensity greatly improves, and the quantum yield (PLQY) increases from 0.7% to 21%. Furthermore, the CsMnCl3:1%Pb NCs feature high-efficiency of X-ray absorption and radioluminescence, which make these NCs promising candidates for X-ray imaging.
Keyword ：
Mn-based perovskites Mn-based perovskites self-absorption free self-absorption free nanocrystals nanocrystals X-ray imaging X-ray imaging
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| GB/T 7714 | Guan, Lin-Quan , Shi, Shuo , Niu, Xiao-Wei et al. All-Inorganic Manganese-Based CsMnCl3 Nanocrystals for X-Ray Imaging [J]. | ADVANCED SCIENCE , 2022 , 9 (18) . |
| MLA | Guan, Lin-Quan et al. "All-Inorganic Manganese-Based CsMnCl3 Nanocrystals for X-Ray Imaging" . | ADVANCED SCIENCE 9 . 18 (2022) . |
| APA | Guan, Lin-Quan , Shi, Shuo , Niu, Xiao-Wei , Guo, Shi-Chen , Zhao, Jian , Ji, Tian-Meng et al. All-Inorganic Manganese-Based CsMnCl3 Nanocrystals for X-Ray Imaging . | ADVANCED SCIENCE , 2022 , 9 (18) . |
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