POLYMER
·
2023
·
IF 4.6
Wenjing Pu,Yue Li,Wei Lu,Bo Shi,Pengyu Tao,Lingling Huang
Radiation detection plays a crucial role in the construction and safe operation of nuclear facilities. Liquid scintillator is widely used in this field but its fluorescence-scintillation properties still require improvement to achieve high sensitivity detection at present. In this paper, a new liquid scintillator system is developed, which selects polysilane as the matrix, and aryl with electron repulsing/withdrawing groups as the grafting substituents. The conjugated structure between the Si–Si chain and the aryl scintillating group enables electron delocalization transfer, resulting in improved fluorescence emission spectra and scintillation sensitivity. Three aryl-grafted polysilanes with typical electron repulsing and withdrawing group are successfully synthesized by Grignard routes. The optical properties of the materials are evaluated through both molecular simulation and experimental measurements, to determine the electronic effect of aryl groups on the electron delocalization in modified polysilane scintillators. The scintillation count performance is also evaluated. In conclusion, polysilanes grafted with aryl groups can be utilized as a new type of liquid scintillator, and electron repulsing substituents could enhance the fluorescence-scintillation properties more effectively, which providing meaningful guidance for the further optimization of liquid scintillation composition .
研究领域:
辐射检测
·
核设施
·
材料科学
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Xiang Li,Haixia Cui,Yanxi Zhong,Xiaoxi Zhou,Shuhong Xu,Shujuan Liu,Chunlei Wang
Lead halide perovskite scintillators have recently received extensive research attention owing to their short fluorescence lifetimes, low detection limits, and ease of fabrication compared to traditional scintillators. The nontoxic cerium-doped lead-free perovskites with intrinsically efficient and short lifetime d–f transitions are a prospective replacement for the toxic Pb 2+ . Here, we demonstrated Ce-doped cesium lanthanide chloride perovskites (Cs 3 LnCl 6 , Ln = Gd, Y, Lu) synthesized through a facile solution method for the first time. These perovskites exhibit blue-violet emission, which arises from Ce 5d → 4f transitions. Among three types of Cs 3 LnCl 6 perovskites, Ce:Cs 3 LuCl 6 exhibited high photoluminescence quantum yield (PLQY) of 82% and a short excited-state lifetime of approximately 34 ns. When utilized as X-ray scintillators, Ce:Cs 3 LuCl 6 crystals display a high light yield of 8120 photons per MeV and a low detection limit of 36.8 nGy air s −1 . Importantly, the figure of merit (FoM), representing the ratio of light yield to decay time, reaches 239, which is the highest reported value for lead-free perovskite scintillators up to now. Additionally, the fabrication of perovskite/PMMA films was undertaken for practical demonstrations in X-ray imaging, resulting in the attainment of a resolution of up to 8.38 lp/mm. We anticipate that this work will inspire the utilization of Ce-doped Cs 3 LnCl 6 perovskites in ultrafast scintillation applications such as high-energy physics, nuclear reaction monitoring, and dynamic X-ray imaging.
研究领域:
材料科学
·
物理学
·
核科学
·
放射学
✓ 已验证
DOI
高影响因子
Nature Photonics
·
2024
·Vol. 18
·期 2
·162-169
·
IF 32.3
Du Xinyuan,Zhao Shan,Wang Lu,Wu Haodi,Ye Fan,Xue Kan-Hao,Peng Shaoqian,Xia Jianlong,Sang Ziru,Zhang Dongdong,Xiong Zuping,Zheng Zhiping,Xu Ling,Niu Guangda,Tang Jiang
Efficient and fast scintillators are in high demand in a variety of fields, such as medical diagnostics, scientific instruments and high-energy physics. However, the trade-off between high scintillation efficiency and fast timing properties is a common challenge facing almost all scintillators. To overcome this limitation, we have developed a strategy for organic scintillators by directing all hot excitons into fast singlet emission states without involving the lowest triplet states. Our scintillator, 1,1,2,2-tetrakis(4-bromophenyl)ethylene, shows an ultrafast radiative lifetime of 1.79 ns and a light yield of ∼ 34,600 photons per MeV, exhibiting an excellent combination of high light yield and short decay time. Our work provides a method to design efficient and ultrafast scintillators, and paves the way towards exciting applications for ultrafast detection and imaging.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Wei Fu,Jiefu Yin,Huaqiang Cao,Zhongfu Zhou,Junying Zhang,Jingjing Fu,Jamie H. Warner,Cheng Wang,Xiaofang Jia,G. Neville Greaves,Anthony K. Cheetham
Photoluminescence blinking behavior from single quantum dots under steady illumination is an important but controversial topic. Its occurrence has impeded the use of single quantum dots in bioimaging. Different mechanisms have been proposed to account for it, although controversial, the most important of which is the non-radiative Auger recombination mechanism whereby photocharging of quantum dots can lead to the blinking phenomenon. Here, the singly charged trion, which maintains photon emission, including radiative recombination and non-radiative Auger recombination, leads to fluorescence non-blinking which is observed in photocharged single graphene quantum dots (GQDs). This phenomenon can be explained in terms of different energy levels in the GQDs, caused by various oxygen-containing functional groups in the single GQDs. The suppressed blinking is due to the filling of trap sites owing to a Coulomb blockade. These results provide a profound understanding of the special optical properties of GQDs, affording a reference for further in-depth research.
研究领域:
纳米材料
·
光学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 9
·2302063
·
IF 9
Yakun Hu,Jiance Jin,Kai Han,Zhiguo Xia
Doping in luminescent metal halides has become an effective strategy for tailoring the optoelectronic properties. Herein, Cu + is introduced into Rb 2 AgBr 3 to design the synthesis of Rb 2 AgBr 3 : x Cu + , which possess cold-white light emission at room-temperature without changing the spectral profiles; however, the Cu + incorporation significantly enhances the photoluminescence quantum efficiency to 98.8% in Rb 2 AgBr 3 :0.05Cu + . Additionally, a high scintillation light yield of up to 79 250 photons MeV −1 and a low detection limit of 714.83 nGy s −1 have been achieved via this Cu + doping engineering. X-ray imaging with a spatial resolution of up to 5.8 lp mm −1 is further realized using a large scintillator film prepared by mixing polydimethylsiloxane with Cu + doped Rb 2 AgBr 3 scintillators. This study provides a Cu + doping design principle for improving both the photoluminescence and scintillation performances of metal halides.
研究领域:
材料科学
·
光电技术
·
放射学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Tianhao Dong,Xuan Jiang,Shan Xing,Yichen Hu,Yun Zhou,Yifan Li,Kesheng Hu,Keliang Shi,Tonghuan Liu,Jiangang He,Xiaolin Hou,Junqiang Yang
It is extremely significant to monitor the radioactive uranium during the process of nuclear energy mining and disposal because of its high levels of chemical and radiological toxicity. In this work, a novel uranium plastic scintillator resin (U-PSresin) was successfully synthesized by suspension polymerization and used to rapidly enrich and determine uranium by Liquid Scintillation Counting (LSC). The U-PSresin shows excellent irradiation stability, extremely appropriate adsorption capacity of U(VI) (9.35 mg/g), which is convenient for the accurate measurement of LSC. Meanwhile, U-PSresin has a deviation of less than 5 % in adsorption and measurement repeatability and can be utilized to accurately measure more than 1 mg of natural uranium after enrichment. For different types of spiked water samples, the measurement deviation of U-PSresin is less than 15 %. This work demonstrates that U-PSresin can selectively enrich and quantitatively measure uranium in an aqueous environment, showcasing its significant potential in nuclear emergency scenarios and environmental monitoring.
研究领域:
核科学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2016
·
IF 13.038
Hujia Cao,Junliang Ma,Lin Huang,Haiyan Qin,Renyang Meng,Yang Li,Xiaogang Peng
Single-molecular spectroscopy reveals that photoluminescence (PL) of a single quantum dot blinks, randomly switching between bright and dim/dark states under constant photoexcitation, and quantum dots photobleach readily. These facts cast great doubts on potential applications of these promising emitters. After ∼20 years of efforts, synthesis of nonblinking quantum dots is still challenging, with nonblinking quantum dots only available in red-emitting window. Here we report synthesis of nonblinking quantum dots covering most part of the visible window using a new synthetic strategy, i.e., confining the excited-state wave functions of the core/shell quantum dots within the core quantum dot and its inner shells (≤ ∼5 monolayers). For the red-emitting ones, the new synthetic strategy yields nonblinking quantum dots with small sizes (∼8 nm in diameter) and improved nonblinking properties. These new nonblinking quantum dots are found to be antibleaching. Results further imply that the PL blinking and photobleaching of quantum dots are likely related to each other.
研究领域:
材料科学
·
纳米技术
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
·
2023
·
IF 5.7
Yirong Su,Peng Ran,Juan Hui,Wenbo Ma,Zeng Chen,Haiming Zhu,Yang “Michael” Yang
Traditional indirect flat-panel X-ray imaging (FPXI) uses inorganic scintillators with high-Z elements, which lack spectral information about X-ray photons and reflect only integrated X-ray intensity. To address this issue, we developed a stacked scintillator structure that combines organic and inorganic materials. This structure allows X-ray energies to be distinguished in a single shot by using a color or multispectral visible camera. However, the resolution of the resulting dual-energy image is primarily limited by the top scintillator layer. We inserted a layer of anodized aluminum oxide (AAO) between the double scintillators. This layer limits the lateral propagation of scintillation light, improves imaging resolution, and acts as a filter for X-rays. Our research demonstrates the advantages of stacked organic–inorganic scintillator structures for dual-energy X-ray imaging and provides novel and practical applications for relatively low-Z organic scintillators with high internal X-ray-to-light conversion efficiency.
研究领域:
医学成像
·
材料科学
·
辐射探测
·
光学材料
·
X射线光谱学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1639
·
IF 4.324
Zhigang Sun,Bin Lu,Guiping Ren,Hongbing Chen
A translucent Gd2O2S:Pr ceramic scintillator with an in-line transmittance of ~31% at 512 nm was successfully fabricated by argon-controlled sintering. The starting precipitation precursor was obtained by a chemical precipitation route at 80 °C using ammonia solution as the precipitate, followed by reduction at 1000 °C under flowing hydrogen to produce a sphere-like Gd2O2S:Pr powder with an average particle size of ~95 nm. The Gd2O2S:Pr phosphor particle exhibits the characteristic green emission from3P0,1→3H4transitions of Pr3+at 512 nm upon UV excitation into a broad excitation band at 285–335 nm arising from 4f2→4f5dtransition of Pr3+. Increasing Pr3+concentrations induce two redshifts for the two band centers of 4f2→4f5dtransition and lattice absorption on photoluminescence excitation spectra. The optimum concentration of Pr3+is 0.5 at.%, and the luminescence quenching type is dominated by exchange interaction. The X-ray excited luminescence spectrum of the Gd2O2S:Pr ceramic is similar to the photoluminescence behavior of its particle. The phosphor powder and the ceramic scintillator have similar lifetimes of 2.93–2.99 μs, while the bulk material has rather higher external quantum efficiency (~37.8%) than the powder form (~27.2%).Keywords:Gd2O2S;Pr3+doping;ceramic scintillator;phosphor powder
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 4
·1047-1054
·
IF 1.6
Hu Yichen,Ma Jiaju,Liu Tonghuan,Zhang Yongjie,Yu Yuhong,Sun Zhiyu,Fang Fang,Dong Tianhao,Zhao Yanhong,Zhou Gen
In this paper, three polymeric bases (styrene, vinyl toluene, methyl methacrylate (MMA)) plastic scintillators were synthesized by thermal and UV irradiation polymerization. The influences of the concentrations of the primary fluorescent agent 2.5-diphenyloxazole (PPO) and wave-shift agent 1,4-bis-2(5-phenyloxazoyl)benzene (POPOP) on plastic scintillators characterization were investigated. The results suggest that the maximum emission wavelength of synthesized plastic scintillators with different polymeric base are all around 423 nm matching with maximum response wavelength of general photoelectric devices, and its decay time with several nanoseconds has reached the same level as the EJ-200. The maximum light yield of the plastic scintillator was achieved when the mass ratio of PPO/POPOP is 1.0%/0.02% for the styrene plastic scintillators.
研究领域:
材料科学
·
核技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xuefei He,Shuai Zhang,Yuzhen Wang,Kai Han,Zhiguo Xia
Hybrid luminescent metal halides has emerged as the state-of-the-art scintillators, while remaining challenges for enhancing light yield and X-ray imaging capability. Herein, halogen engineering is reported to optimize Cu(I)-based hybrid halides by enhancing the X-ray absorption cross-section, resulting in an increase of light yield by 188% to 79,770 photons MeV −1 from (C 12 H 30 N 2 ) 2 Cu 6 Cl 10 to optimized (C 6 H 15 N) 2 CuI 3 . The transparent glassy scintillation screen with optical transparency beyond 82% demonstrates good thermal stability and high mechanical flexibility. More importantly, the high X-ray imaging resolution of 20.5 lp mm −1 is achieved based on the Cu-I-based glassy scintillation screen. The combined merits of enhancing scintillation performance and X-ray imaging resolution provide a platform for developing halide glass scintillators and enriching their applications in radiology and security screening.
研究领域:
材料科学
·
光学材料
·
辐射探测
·
X射线成像
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 7
·2100736
·
IF 10.947
Baiqian Wang,Jiali Peng,Xin Yang,Wensi Cai,Hongbin Xiao,Shuangyi Zhao,Qianqian Lin,Zhigang Zang
Metal halide perovskite-based high-performance X-ray scintillator is considered as one of the most favorable candidates applied in the fields of medicine, industry, and science. However, the current X-ray scilltillators based on perovskites still suffer from the issue of poor stability, which impedes their further wide applications. Herein, a template assembled method to prepare large-size, flexible, and stable CsPbBr 3 @Polymethyl methacrylate composite films in ambient conditions is developed and their detection performance is studied. The composite films can maintain 94% and 81% of the initial PL intensity after 2000 cycles bending and storing in water over 2520 h, respectively. In addition, the prepared scintillators exhibit not only a low detection limit of 40.1 nGy air s −1 and a high spatial resolution of 8.0 lp mm −1 , but also an excellent tolerance against radiation (108 h). Thus, this simple but yet effective method would not doubt pave the way for further development of scintillators and might be well applicable to other metal halides.
研究领域:
材料科学
·
医学影像
·
辐射探测
✓ 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）