ADVANCED MATERIALS
·
2019
·Vol. 31
·期 44
·1904711
·
IF 25.809
Bo Yang,Lixiao Yin,Guangda Niu,Jun-Hui Yuan,Kan-Hao Xue,Zhifang Tan,Xiang-Shui Miao,Ming Niu,Xinyuan Du,Haisheng Song,Efrat Lifshitz,Jiang Tang
Scintillators are widely utilized for radiation detections in many fields, such as nondestructive inspection, medical imaging, and space exploration. Lead halide perovskite scintillators have recently received extensive research attention owing to their tunable emission wavelength, low detection limit, and ease of fabrication. However, the low light yields toward X-ray irradiation and the lead toxicity of these perovskites severely restricts their practical application. A novel lead-free halide is presented, namely Rb 2 CuBr 3 , as a scintillator with exceptionally high light yield. Rb 2 CuBr 3 exhibits a 1D crystal structure and enjoys strong carrier confinement and near-unity photoluminescence quantum yield (98.6%) in violet emission. The high photoluminescence quantum yield combined with negligible self-absorption from self-trapped exciton emission and strong X-ray absorption capability enables a record high light yield of ≈91056 photons per MeV among perovskite and relative scintillators. Overall, Rb 2 CuBr 3 provides nontoxicity, high radioluminescence intensity, and good stability, thus laying good foundations for potential application in low-dose radiography.
研究领域:
材料科学
·
辐射探测技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Jie Zhou,Yuanhang Wangzhou,Zhongren Shi,Xilin Zhang,Lan Yang,Yuxuan Jiang,Yan Kuai,Zhijia Hu,Siqi Li
In recent years, metal halide perovskite scintillators have demonstrated significant potential for X-ray detection applications. However, these scintillators frequently encounter challenges such as poor stability, insufficient radiation hardness, and substantial self-absorption, which detrimentally affect their scintillation efficiency and practicality. This study explores the encapsulation of perovskite (CsPbBr3) nanocrystals and dyes sim simultaneously within mesoporous zinc-based metal-organic frameworks (MOF-5) to boost perovskite scintillation performance. Our findings indicate that the energy transfer from the perovskite to the dye can effectively minimizing the self-absorption of perovskite, significantly increasing the light yield—3.4 times that of pristine CsPbBr3 nanocrystals, and improves the detection sensitivity by 40%. Furthermore, such encapsulation markedly improves perovskite stability and enhances thermal resistance by 78.9% and radiation hardness by 26.5%. These advances in stability, thermal resilience, and radiation durability, combined with a lower detection limit, allow perovskite to be used in more scintillation scenarios and endure more rigorous operational conditions.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chun Sun,Zhengtong Wang,Fuhao Zhang,Anni Chen,Zhihui Deng,Kai Lian,Yiwei Zhao,Jiachen Han,Yelin Ding,Mingming Luo
The development of pure red-emitting CsPbI 3 quantum dots (QDs) has been hindered by challenges including long-term instability, low yield and photoluminescence quantum yields (PLQYs), and self-absorption issues in solid-state applications. Herein, sodium citrate (SC) passivated CsPbI 3 QDs are prepared by using a simple post-treatment method, which is also applicable to other CsPbX 3 QDs. Due to the chelating coordination role of citrate, the PLQY of red SC-CsPbI 3 can reach 96 %. In addition to its passivating role, SC also acts as a matrix to increase inter-particle distances, reducing self-absorption and acquiring high PL intensity. Furthermore, SC treatment can also increase the yield of smaller QDs, which are typically challenging to isolate using conventional centrifugation methods. The passivation afforded by SC results in enhanced thermal and air stability in the samples. We utilized this narrow-band red phosphor to fabricate white light-emitting diodes (WLEDs) for lighting and display applications. Upon incorporating the red phosphor into the commercial WLED, there is a notable enhancement in the color rendering index (CRI), signifying its substantial impact on lighting WLED. For display application, the perovskite-based WLED achieves a color gamut coverage reaching up to 120 % of the National Television System Committee (NTSC) standard. This remarkable performance also underscores its significant potential for applications in display area.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Dan Hong,Xian-yue Xiang,Qiu-ju Zhou,Yu-Lin Zhu,Yong-ping Wu,Jun Yang,Shi-hong Chen,Ke-jun Tan
Multi-emission carbon dots (M-CDs) have broad applications. However, reports of the synthesis of M-CDs and their emission mechanism are limited. In this study, M-CDs with three emissions are synthesized by a one-pot solvothermal method, and the luminescence mechanism is investigated in detail. The prepared M-CDs show significant concentration-dependent properties. For high-concentration M-CDs (HC CDs) , the surface-defect and carbon-core luminescence states are related to emission centers at 423 and 586 nm, respectively. The emission center at 493 nm are mainly due to the self-absorption of M-CDs. Conversely, low-concentration M-CDs (LC CDs) have 423 and 586 nm emissions. The blue CDs (B-CDs) and red CDs (R-CDs) are extracted from the prepared M-CD solution. The structural and optical properties indicate that the 493 nm peak is related to aggregation and self-absorption between B-CDs and R-CDs in HC CDs. Surprisingly, solid CDs (S-CDs) with solid-state room-temperature phosphorescence (RTP) are simultaneously obtained during the preparation of the M-CDs. The mechanism investigation results show that S-CDs are composed of CDs and NaHCO 3 , and NaHCO 3 acts as an oxygen barrier to prevent the quenching of the triplet and rigidly holds the luminescent guests to suppress vibrational dissipation. The M-CDs are successfully applied to detect Morin, while the S-CDs are demonstrated for optical anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2017
·
IF 0.835
Yu Wang,Yue Yang,Peng Wang,Xue Bai
The concentration and temperature dependence of photoluminescence (PL) performance was investigated, which indicated that the main emission in CsPbBr 3 perovskite quantum dots was related to the band-edge mechanism. As the concentration increased from 0.1 to 10.0 mol/L at 293 K, the center of emission band exhibited a regular redshift, as well as the peak intensity increased initially and then declined, which could be attributed to the self-absorption processes. Along with the variation of temperature (273–353 K), peak wavelength, full width of half maximum (FWHM), and peak intensity of PL spectra presented a corresponding linear changes. In addition, the temperature reversibility revealed that CsPbBr 3 QDs were reliable candidates for temperature sensor and optoelectronic devices .
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yuexin Zhu,Peng Ran,Chunshen Li,Chao Wang,Jinlong Zhu,Jiawen Xiao,Yang (Michael) Yang,Peng Zhang
High-performance X-ray scintillation detectors are crucial for X-ray imaging applications, relying on scintillators with high light-yield (LY). In contrast to conventional scintillators with large bandgaps ( E g ), halide perovskite materials with low E g exhibit high LY, emerging as next-generation scintillation materials. Additionally, doping with rare-earth ions extends the emission wavelength to the near-infrared (NIR) region, effectively suppressing light self-absorption of perovskite materials. Here, we fabricated a Ytterbium-ion (Yb 3+ ) doped CsPbCl 3 : 2%Yb 3+ single crystal (SC) with a large-size of Φ30 × 40 mm via the Bridgman method, which exhibits a low E g of 2.88 eV and efficient NIR luminescence centered at 985 nm, achieves a high steady state LY of 83 703 photons MeV −1 , and a large effective “Stokes shift” of 563 nm. Furthermore, we prepare a series of flexible scintillation films by embedding CsPbCl 3 : 2%Yb 3+ powder in polydimethylsiloxane (PDMS). Owing to the efficient NIR luminescence, these films enable clear X-ray imaging even under bright white-LED interference, demonstrating a low X-ray detection limit of 17.8 nGy air s −1 and a high spatial resolution of 10 lp mm −1 . This work provides a high-LY NIR scintillator for X-ray flexible imaging, paving the way for low dose-rate X-ray imaging for portable and fast radiography.
研究领域:
生物医学工程
·
医学影像学
·
材料科学
·
辐射探测
·
纳米医学
·
转化医学
✓ 已验证
产品关联
DOI
高影响因子
Light-Science & Applications
·
2020
·Vol. 9
·期 1
·1-10
·
IF 13.714
Zhu Wenjuan,Ma Wenbo,Su Yirong,Chen Zeng,Chen Xinya,Ma Yaoguang,Bai Lizhong,Xiao Wenge,Liu Tianyu,Zhu Haiming,Liu Xiaofeng,Liu Huafeng,Liu Xu,Yang Yang (Michael)
X-rays are widely used in probing inside information nondestructively, enabling broad applications in the medical radiography and electronic industries. X-ray imaging based on emerging lead halide perovskite scintillators has received extensive attention recently. However, the strong self-absorption, relatively low light yield and lead toxicity of these perovskites restrict their practical applications. Here, we report a series of nontoxic double-perovskite scintillators of Cs 2 Ag 0.6 Na 0.4 In 1-y Bi y Cl 6 . By controlling the content of the heavy atom Bi 3+ , the X-ray absorption coefficient, radiative emission efficiency, light yield and light decay were manipulated to maximise the scintillator performance. A light yield of up to 39,000 ± 7000 photons/MeV for Cs 2 Ag 0.6 Na 0.4 In 0.85 Bi 0.15 Cl 6 was obtained, which is much higher than that for the previously reported lead halide perovskite colloidal CsPbBr 3 (21,000 photons/MeV). The large Stokes shift between the radioluminescence (RL) and absorption spectra benefiting from self-trapped excitons (STEs) led to a negligible self-absorption effect. Given the high light output and fast light decay of this scintillator, static X-ray imaging was attained under an extremely low dose of ∼ 1 μGy air , and dynamic X-ray imaging of finger bending without a ghosting effect was demonstrated under a low-dose rate of 47.2 μGy air s −1 . After thermal treatment at 85 °C for 50 h followed by X-ray irradiation for 50 h in ambient air, the scintillator performance in terms of the RL intensity and X-ray image quality remained almost unchanged. Our results shed light on exploring highly competitive scintillators beyond the scope of lead halide perovskites, not only for avoiding toxicity but also for better performance.
研究领域:
材料科学
·
放射学
·
成像技术
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-12
·
IF 23.4
Song Shi-Yu,Gao Chao-Jun,Zhou Rui,Wang Bing-Zhe,Zhao Wen-Bo,Cao Qing,Hu Yan-Wei,Dong Lin,Liu Kai-Kai,Shan Chong-Xin
Size-scalable X-ray scintillators with high transparency and robust photon yield allow for imaging large objects with greater precision and detail. Solution-processable scintillators, typically crafted from quantum dots (QDs), are promising candidates for highly efficient scintillation applications. However, the restricted size and low transparency in QD-based scintillators lead to less efficient X-ray imaging for large objects requiring high resolution. Herein, we demonstrate a meter-scale ZnO QD scintillator with a visible range transmittance exceeding 96%, featuring bright singlet-triplet hybrid self-trapping excitons (STEs). The quantum yields (QYs) of singlet excitons and triplet excitons are 44.7% and 26.3%. Benefiting from a large Stokes shift and bright triplet excitons, the scintillator has a negligible self-absorption and elevated photon yields. Additionally, the scintillator exhibits exchange invariance, demonstrating identical optical performance upon exchanging the coordinates ( r ) of the QDs. Featuring bright singlet-triplet hybrid STEs and high transparency, the scintillator achieves high resolution X-ray imaging of 42-line pairs per millimeter (42 lp mm −1 ) at a meter scale. Moreover, demonstrations of 5000 cm 2 X-ray imaging and real-time dynamic X-ray imaging are presented. The lowest detectable dose rate for X-ray detection is as low as 37.63 ± 0.4 nGy s −1 . This work presents a novel sizable and transparent scintillator with bright singlet-triplet hybrid STEs, showcasing their potential in high-resolution and sizable object X-ray imaging.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
辐射探测
·
成像技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Yingzheng Zhao,Hangbo Chen,Kunjie Ran,Yingying Zhang,Hanxiao Pan,Jianxun Shangguan,Mengqi Tong,Jiaojiao Yang,Qing Yao,Helin Xu
Current bioceramic scaffolds for critical-size bone defects are still facing various challenges such as the poor capability of self-resorption, vascularization and osteogenesis. Herein, a composite scaffold (HOD) is fabricated by integrating bioactive coatings of konjac glucomannan (KGM) and deferoxamine (DFO) into porous hydroxyapatite scaffold (HA), where KGM coating induces the self-resorption of HOD after implanting and DFO promoted the vascularization at the defected bone. Porous HA scaffolds with 200–400 μm of pore sizes were prepared and these bioactive coatings were successfully deposited on the scaffold, which was confirmed by SEM. MC3T3-E1 cells could be tightly attached to the pore wall of HOD and the obvious osteogenic differentiation was clearly displayed after 14 days of co-culture. Besides, HOD displayed the potential of promoting the vascularization of HUVECs. Importantly, the accelerated degradation of HOD was observed in a macrophage-associated acidic medium, which led to the self-resorption of HOD in vivo . Micro-CT images showed that HOD was gradually replaced by newly formed bone, achieving a balance between the new bone formation and the scaffold degradation. The rapid bone repairing of the femoral defects in rats was displayed for HOD in comparison to the HA scaffold. Moreover, the therapeutic mechanism of HOD was highly associated with promoted osteogenesis and vascularization. Collectively, the porous ceramic scaffold orchestrated with bioactive coatings may be a promising strategy for repairing of the large bone defect.
研究领域:
生物医学工程
·
组织工程
·
生物材料科学
·
骨科
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Chen Li,Jun'an Lai,Daofu Wu,Qiang Wang,Yanjun Bai,Peng He,Kang An,Xiaosheng Tang
Metal halide with high luminescence property have emerged as the novel candidate materials for X-ray detection and imaging. However, the toxicity of some metal cations , such as Pb 2+ , limits its further widespread application. In this work, a new of lead-free pyridine manganese halide (C 5 H 6 N) 2 MnBr 4 was synthesized by the solution-processed method in room temperature . The research results show (C 5 H 6 N) 2 MnBr 4 has a typical structure of tetrahedral coordination related to d-d transition, which has a strong green emission at 520 nm with a full width at half maximum (FWHM) of 45 nm. (C 5 H 6 N) 2 MnBr 4 exhibits high photoluminescence quantum yields (PLQYs) of 59.36%, appreciable light yield of 15400 photons/MeV which is much higher than lead halide, relative short PL decay lifetime (247 μs) which is shorter than previous reported manganese halide and ultrashort RL decay time (12.24 ns). Finally, the performance of (C 5 H 6 N) 2 MnBr 4 Scintillators was verified via X-ray imaging, and clear X-ray image was obtained. (C 5 H 6 N) 2 MnBr 4 scintillators are eco-friendly and easy-synthesize while it has many superior performances: large stokes shift to reduce self-absorption of light; high PLQY to enhance scintillation performances; short decay lifetime to improve response. Thus, (C 5 H 6 N) 2 MnBr 4 shows great potential as next generation of scintillators and this work provides a new way for the preparation of simple and low-cost metal halide scintillators.
研究领域:
材料科学
·
放射学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）