CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Mingzhi Li,Zhikai Liu,Wang Yao,Chao Xu,Yangping Yu,Mei Yang,Guangwen Chen
Ligand assisted reprecipitation (LARP) is a widely used method for cesium lead halide perovskite nanocrystals (NCs) synthesis. Nevertheless, the ultrafast kinetics of LARP, as well as the inefficient transport properties and discontinuity of batch reactors, challenge the particle size control and experimental repeatability. To address these issues, an ultrasonic cavitation-enabled microfluidic approach was developed to achieve the continuous synthesis of cesium lead halide perovskite via LARP. It was found that the mixing between the good solvent and antisolvent in the microchannel was greatly enhanced by intensive ultrasonic cavitation. The mixing time could be reduced to below 10 ms under the irradiation of 35 W ultrasound. By modulating the mixing degree, LARP was proved to be a mixing-sensitive process. The effects of ultrasonic power, ultrasonic treatment time, total flow rate, water additive, and reprecipitation temperature on the synthesis of CsPbBr 3 NCs were systematically investigated. As compared to CsPbBr 3 NCs synthesized in the batch reactor, the sample synthesized via the ultrasonic cavitation-enabled microfluidic approach possessed stronger photoluminescence intensity and better repeatability. Moreover, the ultrasonic cavitation-enabled microfluidic approach could also realize the continuous synthesis of cesium lead halide perovskite NCs with different halide compositions to cover a wide visible spectrum (426–661 nm). The ultrasonic cavitation-enabled microfluidic approach paved the way for the large-scale of high-quality cesium lead halide perovskite NCs.
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NUCLEAR TECHNOLOGY
·
2022
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IF 1.667
Yanhui Wang,Qiao Jiang,Yexin Yang,Jianfeng Cheng,Chenyang Bao,Yuelong Pan,Yu Liu,Gang Yang,Yangchun Leng,Xianguo Tuo
The alteration of the morphology of bentonite, a key barrier to isolating high-level radioactive waste in deep geological repositories under long-term interaction with groundwater, was studied. Bentonite colloids were prepared from Gaomiaozi bentonite, and its various properties were analyzed by various characterization methods. The effects of various factors on the adsorption of Cs(I) and Co(II) on bentonite colloids were investigated by batch static adsorption experiments. The results showed that the colloids were mainly composed of montmorillonite and were lamellar in shape, with a zeta potential of −enton mV and an average size of approximately 209.10 nm. The adsorption of Cs(I) and Co(II) by the colloids was a rapid process, and 31.78 and 88.24 mg/g, respectively, were adsorbed at equilibrium. Pseudo-second-order kinetic fitting showed that chemisorption plays a dominant role and acid-base interactions affect adsorption by influencing the stability of colloids and the chemical form of simulated nuclides. This work can be helpful for evaluating the safety of waste repositories.
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Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2202059
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IF 10.05
Zhicheng Wang,Jiale Guo,Qi-Sheng Lin,Guanghui Rao,Jingtai Zhao,Chengzhang Yang,Weixiang He,Chujie Wang,Zhijun Zhang
Copper-based metal halide scintillators have received increasing attention due to their high light yield and nontoxicity. However, the synthetic methods are still not feasible for actual commercialization for the difficulty in scaling up and the absence of green chemical footprint. Herein, we report a new, simple, aqueous synthetic method for the mass production of highly purified and crystallized Cs 3 Cu 2 Cl 5 powder by a room-temperature reaction between a saturated aqueous solution of CsCl and a saturated hydrochloric acid solution of CuCl. The product exhibits a photoluminence peak centering at 527 nm (FWHM = 106.7 nm) and a quantum yield (PLQY) of 97%. A prototype X-ray imaging detector is fabricated by coupling a large area scintillation screen prepared by blade coating of Cs 3 Cu 2 Cl 5 powder and a commercial thin-film transistor (TFT) panel (16 cm × 13 cm, 125 µm pixel size) with readout circuit. The device exhibits a high spatial resolution of 4 lp mm −1 , exceeding the theoretical limit of the TFT panel, and an excellent dynamic imaging ability. In short, this work demonstrates an efficient novel synthetic method of Cs 3 Cu 2 Cl 5 and its application as X-ray imaging device, providing an applicable solution for its future commercialization.
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JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Fan Xu,Haoming Wei,Yangqing Wu,Yu Zhou,Jinkai Li,Bingqiang Cao
The CsPbCl 3 perovskite films are successfully grown on quartz substrates by radio frequency (RF)-magnetron sputtering method and their detailed photoluminescence properties are studied over the temperatures from 10 K to 300 K. There exists one near bandgap emission peak (∼410 nm) in the violet region with typical lifetime of few nanoseconds at room temperature . To our surprise, with temperature increasing, this band shows nonmonotonic shift, which is different to the traditional semiconductor like silicon or the same group of perovskites like MAPbI 3 or CsPbBr 3 . The origin of this band and its temperature-dependent shift can be well described with the Bose-Einstein two-oscillator model that takes into account the interaction between electrons and phonons including acoustic phonons and optical phonons. Due to the anisotropic optical properties of the perovskite crystal, the (001)-orientated films have stronger electron phonon coupling and weaker exciton binding energy.
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APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Chao Gao,Jiaying He,Senjian Han,Yafei Guo,Shiqiang Wang,Tianlong Deng
Human health and sustainable development of nuclear energy pose new challenges for cesium removal. Herein, exploiting a novel metal ferrocyanides (MFCs) adsorbent is highly desirable for efficiently eliminate Cs + from contaminated water. Based on zinc phytate (Zn-PA), the newly synthesized hybrid material of ZnFC-PA exhibits top-class adsorption capacity ( q m = 559.76 mg/g) and excellent stability in a wide range of pH. The rapid adsorption kinetics and superior selectivity in the existence of numerous competing ions confirm the outstanding performance for cesium separation. Furthermore, the adsorption performance is roughly static after several cycles, and the distribution coefficient K d still remains at a high level (3.3 × 10 4 mL/g) even in practical geothermal water. The excellent adsorption performance and reusability make it a promising Cs + adsorbent to remediate the environment.
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Journal of Physical Chemistry C
·
2023
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IF 3.7
Liang Jing,Qingmei Cen,Qi Pang,Jin Zhong Zhang
In this work, lead-free zero-dimensional (0D) all-inorganic perovskite Mn2+-doped Cs2InCl5·H2O microcrystals (MCs) with introduced Bi3+ ion were synthesized by supersaturation recrystallization at room temperature. The electronic bandgap of the MCs is tuned from ∼5.1 to ∼3.1 eV, and the electronic absorption is enhanced in the 200–400 nm region by Bi3+ incorporation. Upon excitation at 365 nm, the MCs with introduced Bi3+ exhibit strong red emission peaking at 640 nm, which is attributed to the Mn2+ transition (4T1g → 6A1g). Simultaneous Mn2+ and Bi3+ incorporation into Cs2InCl5·H2O shows 60 times enhancement of the 640 nm emission band compared to Mn2+ alone. This PL enhancement is attributed to the energy transfer (ET) from the [BiCl6]3– octahedron, which acts as a UV light absorber and exciton donor, to [MnCl6]4–. In addition, a yellow-light-emitting diode (LED) device based on the Cs2In0.45Bi0.55Cl5·H2O:17%Mn MCs was fabricated and evaluated, showing high color saturation at a drive current of 420 mA and good stability. This study demonstrates a new method for achieving efficient red emission by incorporating ns2 metal ions and Mn ions in 0D lead-free metal halides.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
You Li,Sai Xu,Qun Zhang,Yuefeng Gao,Xizhen Zhang,Yongze Cao,Hongquan Yu,Xiangping Li,Baojiu Chen
Inorganic lead-free halide perovskites are quite desirable for various applications due to their outstanding optoelectronic performances. However, excitation wavelength-dependent multi-emission in a single luminophore is less reported. In this study, Sb 3+ /Bi 3+ /Er 3+ codoped Cs 2 Ag 0.1 Na 0.9 InCl 6 lead-free double perovskite with upconversion and downshifting luminescence modes has been developed. The double perovskite displays a dual-emission band located at 450 nm and 580 nm under excitation of 355 nm. The blue emission originates from self-trapped excitons (STEs) in [SbCl 6 ] 3- octahedrons, while the yellow emission comes from STEs between states localized in the BiCl 6 and AgCl 6 octahedra. Interestingly, the phosphor’s emission can be dynamically adjusted by excitation wavelength and Sb 3+ doping concentration. Not only that, the phosphor can also generate upconversion green light upon the irradiation of 980 nm lasers. The multi-excitation wavelength characteristics of this perovskite make it very suitable as a material for anti-counterfeiting and encoded information storage, and the excellent temperature stability and moisture resistance of this perovskite also make it more promising.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Shu-Yi Yao,Hao Li,Min Zhou,Tian-Chi Wang,Xue Yu,Yin-Sheng Xu,Jian-Hong Yi,Jian-Bei Qiu,Jie Yu,Xu-Hui Xu
X-rays play an extremely significant role in medical diagnosis, safety testing, scientific research, and other practical applications. However, as the main sources of radioactive pollution, the hazard of X-rays to human health and the environment has been a major concern. Herein, the explored perovskite scintillator of Cs2Zr1–xPbxCl6 in this work exhibits an ultrahigh radioluminescence intensity owing to the enhanced X-ray absorption for the introduction of Pb2+ ions. The Cs2Zr1–xPbxCl6 crystals are demonstrated as efficient scintillators with a self-trapped exciton emission and extremely high steady-state light yield (∼101,944 photons meV–1). This fascinating scintillator provides a convenient visual tool for X-ray detection even for an indoor lighting environment, reaching a low detection limit of ∼14.2 nGy·s–1, which is about 1/387 of the typical medical imaging dose (5.5 μGy·s–1). Moreover, X-ray imaging with a high resolution of 16.6 lp·mm–1 is achieved with the as-explored Cs2Zr1–xPbxCl6 scintillator film. Herein, the Cs2Zr1–xPbxCl6 scintillator provides a feasible strategy for X-ray monitoring in the field of biomedicine, high-energy physics, national security, and other applications.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Qian Meng,Liuyun Chen,Liang Jing,Qi Pang,Jin Zhong Zhang
Herein, we develop a facile strategy to synthesize one-dimensional Sn-incorporated CsMnCl 3 microcrystals (MCs) via an acid dissolution method under high humidity. The prepared CsMnCl 3 (H 2 O) α :0.50%Sn (α = 0 or 2, noted as CMCH:0.50%Sn) MCs exhibit an intense red emission assigned to 4 T 1g → 6 A 1g transition of Mn 2+ with a photoluminescence (PL) quantum yield (QY) of 15.77%, which is four times than that of pristine CsMnCl 3 (H 2 O) 2 MCs, with an activation energy of 160 meV determined from a temperature-dependent PL Boltzmann analysis. Sn 2+ ions incorporation can promote the formation of anhydrous CsMnCl 3 and are likely bonded to Cl ions. A red LED device based on CMCH:0.50%Sn MCs shows ultra-high color purity at a drive current of 300 mA and good stability. This work successfully addresses the issue of typically low PL QY of lead-free manganese halide perovskite-analogues (MHPAs) and provides insight into the fundamental optical properties and phase transformation mechanisms of all-inorganic MHPAs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Chao Gao,Wenfeng Yan,Senjian Han,Yafei Guo,Shiqiang Wang,Tianlong Deng
The leaked radioactive cesium is urgent to be eliminated due to the endangerment of human health and ecosystems. Herein, the layer-by-layer assembled ferrocyanide composite fibers were fabricated based on the coordination of phytic acid (PA) and Zn 2+ . The obtained Cs-adsorptive fibers (ZnFC/PA/PSF) showed the top-class adsorption capacity (524.67 mg/g) and fast kinetics (25 min). In addition, it exhibited excellent selectively towards Cs + with the presence of various co-existing ions, which was further proved in geothermal water (distribution coefficient, K d = 2.5 × 10 4 mL/g). Moreover, ZnFC/PA/PSF displayed favorable pH stability with negligible dissolution of Zn and Fe, and satisfied reusability after ten adsorption cycles. This work demonstrates that the ZnFC/PA/PSF composite fibers are eco-friendly and cost-effective adsorbent for the treatment of the Cs-contaminated water.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 4
·1263-1275
·
IF 1.6
Nong Caiyong,Li Xiaodong,Xu Junhua
This study aims to investigate Cs removal by different external metals hexacyanoferrates M II –Fe PBA (M II : Co, Ni and Cu). Three PBAs were synthesized, characterized and followed by batch experiment testing and model fitting. Among the three PBAs, Cu–Fe PBA possessed the highest capacity 234.28 mg g −1 , the highest K d 2.8 × 10 6 mL g −1 and the fastest adsorption kinetics on Cs removal. Moreover, Cu–Fe PBA and Ni–Fe PBA were the more selective sorbents in coexisting ions study. Finally, the adsorption mechanism was proposed. This study provides new insights into the vacancies effect of the PBA structure and Cs adsorption application.
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CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Peipei Dang,Guodong Zhang,Wei Yang,Hongzhou Lian,Guogang Li,Jun Lin
Combining rare-earth ions (RE3+) in halide perovskites is a hopeful strategy to produce interesting optical properties in visible and near-infrared (NIR) regions. Here, RE3+ (RE: Nd, Ho, Er, Tm) ions are successfully introduced into Cs4Cd1–wMnwBi2Cl12 (0 ≤ w ≤ 1) vacancy-ordered quadruple perovskites through a facile hydrothermal method. In addition to the strong orange-red Mn2+ emission, the as-prepared materials exhibit the effective characteristic emission of RE3+ in the red and NIR regions via constructing a Mn2+ energy bridge. With Mn2+ gradually replacing Cd2+ in Cs4Cd1–wMnwBi2Cl12:RE3+, the photoluminescence (PL) of RE3+ in the red and NIR ranges shows an increasing trend until it reaches the strongest value (w = 1). The energy transfer processes of [BiCl6]3– → Mn2+ → RE3+ are confirmed, and the corresponding mechanism is explored. According to the manipulation of the Mn2+/Cd2+ component, an evolution process from direct to indirect band gaps is verified via a combined experimental–theoretical approach. White light-emitting diodes (LEDs) are fabricated by employing Ho3+-doped Cs4MnBi2Cl12 on near-ultraviolet (n-UV) LED chips, achieving an improved color rendering index (CRI) from 83.3 to 93.0 compared to that of the parent compound. Codoping RE3+ (RE: Nd, Ho, Er, Tm) ions into Cs4MnBi2Cl12 results in an ultrawide emission covering both NIR I and NIR II regions, implying a great potential for NIR detection application.
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