Nano Research
·
2023
·Vol. 16
·期 7
·10476-10482
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IF 9.9
Li Xiaohan,Liu Aijun,Wang Zhaoyu,Wei Youchao,Lin Qun,Chen Yameng,Liu Yongsheng,Hong Maochun
Self-trapped excitons (STEs) emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices. Nevertheless, the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete. Herein, a doping-enhanced exciton-phonon coupling effect is observed in Cs 3 Cu 2 I 5 nanocrystals (NCs), which leads to a remarkable increasement of their STEs emission efficiency. Mechanism study shows that the hetero-valent substitution of Cu + with alkaline-earth metal ions (AE 2+ ) causes a greater degree of Jahn–Teller distortion between the ground state and excited state structures of [Cu 2 I 5 ] 3− clusters as evidenced by our spectral analysis and first-principles calculations. As a consequence, an X-ray detector based on these Cs 3 Cu 2 I 5 :AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm −1 and a low detection limit of 0.37 µGy air ·s −1 , disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.
研究领域:
材料科学
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光学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 25
·8524-8532
·
IF 6.4
Luojia Huang,Hangtao Ye,Weidong Xiang,Hongbin Fan,Xiaojuan Liang
Zero-dimensional lead-free metal halides Cs3Cu2X5 (X = Cl, Br, and I) have attracted much attention in recent years due to their unique structure, photoelectric properties and environment-friendly nature; unfortunately they are sensitive to humidity. Herein, Cs3Cu2I5 nanocrystals (NCs) were successfully precipitated in situ within glass using the methods of melt quenching and heat treatment (Cs3Cu2I5 glass ceramic). The optical characterization and morphological characterization provide evidence for the successful in situ precipitation of the Cs3Cu2I5 glass ceramic, and the photoluminescence quantum yield (PLQY) is as high as 63.3%. The water stability of Cs3Cu2I5 NCs is greatly improved due to the inorganic glass matrix, and the fluorescence intensity remains largely unchanged for 30 days. The Cs3Cu2I5 glass ceramic endows Cs3Cu2I5 NCs with a wider range of application areas. Finally, by constructing an X-ray imaging system using Cs3Cu2I5 glass ceramics, springs in opaque samples were observed to be visible, demonstrating the great potential of Cs3Cu2I5 glass ceramics with long-term stability for X-ray detection imaging.
研究领域:
材料科学
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光学工程
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医学影像
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2020
·Vol. 7
·期 11
·2000195
·
IF 15.84
Linyuan Lian,Moyan Zheng,Weizhuo Zhang,Lixiao Yin,Xinyuan Du,Peng Zhang,Xiuwen Zhang,Jianbo Gao,Daoli Zhang,Liang Gao,Guangda Niu,Haisheng Song,Rong Chen,Xinzheng Lan,Jiang Tang,Jianbing Zhang
Radioluminescent materials (scintillators) are widely applied in medical imaging, nondestructive testing, security inspection, nuclear and radiation industries, and scientific research. Recently, all-inorganic lead halide perovskite nanocrystal (NC) scintillators have attracted great attention due to their facile solution processability and ultrasensitive X-ray detection, which allows for large area and flexible X-ray imaging. However, the light yield of these perovskite NCs is relatively low because of the strong self-absorption that reduces the light out-coupling efficiency. Here, NCs with self-trapped excitons emission are demonstrated to be sensitive, reabsorption-free scintillators. Highly luminescent and stable Cs 3 Cu 2 I 5 NCs with a photoluminescence quantum yields of 73.7%, which is a new record for blue emission lead-free perovskite or perovskite-like NCs, is produced with the assistance of InI 3 . The PL peak of the Cs 3 Cu 2 I 5 NCs locates at 445 nm that matches with the response peak of a silicon photomultiplier. Thus, Cs 3 Cu 2 I 5 NCs are demonstrated as efficient scintillators with zero self-absorption and extremely high light yield (≈79 279 photons per MeV). Both Cs 3 Cu 2 I 5 NC colloidal solution and film exhibit strong radioluminescence under X-ray irradiation. The potential application of Cs 3 Cu 2 I 5 NCs as reabsorption-free, low cost, large area, and flexible scintillators is demonstrated by a prototype X-ray imaging with a high spatial resolution.
研究领域:
材料科学
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光学
·
放射学
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Fei Gao,ChunYang Liu
Cu-based halide perovskites arouse broad interest in optoelectronics because of the low toxicity and superb optical properties. However, the uniformity of phase purity and crystallite size in Cs 3 Cu 2 I 5 nanocrystals (NCs) can hardly be controlled, restricting the material development. In this study, an efficient method is reported based on addition of an inorganic additive, MgI 2 , into the precursor solutions to improve crystallization and passivate ionic defects of Cs 3 Cu 2 I 5 NCs. This approach results in single-phase Cs 3 Cu 2 I 5 NCs of high crystalline quality that have markedly improved optical performance. The optimized synthesis of Cu-based perovskite NCs with MgI 2 produced samples that exhibited quantum yields as high as 98 % in the deep blue spectral region. The Cs 3 Cu 2 I 5 NCs also had good stability under elevated temperature, ultraviolet light, and air exposure. Light-emitting devices were manufactured based on Cs 3 Cu 2 I 5 NC powder as a phosphor, which exhibited good working stability over 6 h. This work deepens our understanding of the Cu-based perovskite materials, providing a theoretical basis for designing novel high-quality lead-free perovskites materials.
研究领域:
无机化学
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材料科学
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光电子学
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纳米技术
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固体物理
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产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 16
·6152-6159
·
IF 6.482
Xudong Hu,Yuelei Li,Ye Wu,Weiwei Chen,Haibo Zeng,Xiaoming Li
Copper halide Cs3Cu2X5 (X = Cl, Br, I) nanocrystals (NCs) have become a research hotspot in recent years. Compared with perovskite NCs, they have a large Stokes shift with a self-absorption-free effect and convenient solution processability, which endows them with potential applications in high-resolution flexible X-ray imaging and ultraviolet detection. However, the synthesis of Cs3Cu2I5 NCs is limited to the hot-injection method, which needs tedious operation procedures. Here, a one-pot fabrication strategy was designed based on the principle of chemical potential and thermodynamic equilibrium to achieve the mass production of Cs3Cu2I5 NCs. With the assistance of I−, Cs3Cu2I5 NCs were successfully fabricated with a reaction yield of about 70%, with the emission peak located at 445 nm and a high photoluminescence quantum yield (PLQY) of 72.6%. By scaling up the initial reaction volume tenfold, we successfully demonstrated mass production. Furthermore, Cs3Cu2Br5 and Cs3Cu2Cl5 NCs were also fabricated using this approach, indicating the versatility of this method. This strategy effectively optimizes the experimental process and cost, providing convenience for subsequent research based on this kind of material, such as optical electronic devices, ion-doping studies and so on.
研究领域:
材料科学
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纳米技术
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xue Hao,Lin Nie,Xuanyu Zhu,Guoqiang Zeng,Chunhai Liu,Zhaowei Teng,Haozhe Liu,Yang Yue,Xue Yu,Ting Wang
Cs3Cu2I5 nanocrystals (NCs) are considered to be promising materials due to their high photoluminescence efficiency, lack of lead toxicity, and X-ray responsiveness. However, during the crystallization process, NCs are prone to agglomeration and exhibit uneven size distribution, resulting in several light scattering that severely affect their imaging resolution. Herein, we successfully developed a high-resolution scintillator film by growing copper-based perovskite NCs within a hybrid polymer matrix. By leveraging the ingenious integration of polyvinylidene fluoride (PVDF) and polymethyl methacrylate (PMMA), the size and distribution uniformity of Cs3Cu2I5 NCs can be effectively controlled. Consequently, a high spatial resolution of 14.3 lp mm–1 and a low detection limit of 105 nGy s–1 are achieved, and the scintillator film has excellent flexibility and stability. These results highlight the promising application of Cs3Cu2I5 scintillator films in low-cost, flexible, and high-performance medical imaging.
研究领域:
材料科学
·
纳米技术
·
医学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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