INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Jing Liu,Qichuan Hu,Hailong Yu,Hanqi Xu,Jinyang Yu,Qiuju Han,Wenzhi Wu
Here, we synthesized pure Cs3Bi2Cl9 (CBC) and manganese (Mn)-doped crystals with different feeding ratios, leading to changes in structure and luminescence. The crystals Cs3Bi2Cl9–Mn (CBCM) formed by doping a minor amount of Mn2+ (Bi/Mn = 8:1) maintain the orthorhombic phase structure of the host, but when Bi/Mn = 2:1, the crystal structure is more inclined to form Cs4MnBi2Cl12 (CMBC) of a trigonal phase. Combined with density functional theory (DFT) calculation, the results demonstrate that a moderate amount of Mn2+ doping can create impurity energy levels in the forbidden band. However, as the structure transitions, the type of energy band structure changes from indirect to direct, with completely different electronic orbital features. Temperature-dependent time-resolved and steady-state photoluminescence spectroscopies are used to explore the structure-related thermal properties and transitional process. Differences energy transfer routes are revealed, with CBCM relying on intersystem energy transfer and CMBC mainly depending on direct excitation of Mn2+ to produce d–d transitions. Furthermore, since CMBC is temperature-sensitive, we perform the first photoluminescent (PL) lifetime temperature measurement using CBMC and obtain a maximum relative sensitivity of 1.7 %K–1 and an absolute sensitivity of 0.0099 K–1. Our work provides insight into the mechanism of Mn2+ doping-induced luminescence and offers a potentially effective doping strategy for improving the PL properties of lead-free metal halide perovskites.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Senjian Han,Chao Gao,Wenfeng Yan,Yafei Guo,Shiqiang Wang,Tianlong Deng
Radioisotope leaking from nuclear waste has become an intractable problem due to its gamma radiation and strong water solubility. In this work, a novel porous ZnFC-PA/PSF composite sphere was fabricated by immobilization of ferrocyanides modified zinc phytate into polysulfone (PSF) substrate for the treatment of Cs-contaminated water. The maximum adsorption capacity of ZnFC-PA/PSF was 305.38 mg/g, and the removal efficiency of Cs + was reached 94.27% within 2 hr. The ZnFC-PA/PSF presented favorable stability with negligible dissolution loss of Zn 2+ and Fe 2+ (< 2%). The ZnFC-PA/PSF achieved high-selectivity towards Cs + ( K d = 2.24×10 4 mL/g) even in actual geothermal water. The adsorption mechanism was inferred to be the ion-exchange between Cs + and K + . What's more, ZnFC-PA/PSF worked well in the fixed-bed adsorption ( E = 91.92%), indicating the application potential for the hazardous Cs + removal from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Fan Chen,Xiao-Jun Wang,Xuehu Zhang,Changhua Zhang
Lead-free halide perovskites have recently evoked considerable interest in illumination and display, due to their intriguing optical properties . Herein, we present an efficient and facile strategy to prepare Cs 2 InCl 5-x Br x ·H 2 O (x = 0–5) perovskites . The preparation was performed at a low temperature of 80 °C under atmospheric pressure, and required no complex technological process. Comparing with that prepared by the traditional hydrothermal method , the emission intensity of the prepared Cs 2 InX 5 ·H 2 O (X = Cl/Br) perovskites were increased by two times. Besides, Sb 3+ ions were successfully doped into the matrix of Cs 2 InX 5 ·H 2 O (X = Cl/Br) by our method. After doping with Sb 3+ , the emission intensities of Cs 2 InX 5 ·H 2 O were greatly enhanced, with enhanced by a factor of ∼187 and ∼102, respectively. Importantly, the PLQYs were greatly improved, reaching 79.6% and 42.7%, respectively. Additionally, the effects of Br − on luminescent properties of Cs 2 InCl 5-x Br x ·H 2 O:Sb 3+ (x = 0–5) were also investigated in this work. Though the control of the Br − content, tunable emissions from 575 nm to 630 nm were achieved. These results indicate the prepared samples could be promising environmentally-friendly materials for lightings. Furthermore, this work presents a reliable and simple method for preparing high-quality perovskites.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 33
·2302465
·
IF 13.3
Pengye Du,Pengpeng Lei,Yuan Liang,Ran An,Hongjie Zhang
Lanthanide-doped upconversion luminescent materials (LUCMs) have attracted much attention in diverse practical applications because of their superior features. However, the relatively weak luminescence intensity and low efficiency of LUCMs are the bottleneck problems that seriously limit their development. Unfortunately, most of the current major strategies of luminescence enhancement have some inherent shortcomings in their implementation. Here, a new and simple strategy of molten salt-assisted synthesis is proposed to enhance lanthanide upconversion luminescence for the first time. As a proof-of-concept, a series of rare earth oxides with obvious luminescence enhancement are prepared by a one-step method, utilizing molten NaCl as the high-temperature reaction media and rare earth chlorides as the precursors. The enhancement factors at different reaction temperatures are systematically investigated by taking Yb 3+ /Er 3+ co-doped Y 2 O 3 as an example, which can be enhanced up to more than six times. In addition, the molten salts are extended to all alkali chlorides, indicating that it is a universal strategy. Finally, the potential application of obtained UCL materials is demonstrated in near-infrared excited upconversion white light-emitting diodes (WLEDs) and other monochromatic LEDs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Gang Yang,Songchao Bai,Xueguo Li,Hao Liang,Chao Li,Jie Sun,Yinhua Wang,Jinshu Huang,Gencai Pan,Yongsheng Zhu
Lead-free halide double perovskite, as one of the promising candidates for lead halide perovskite materials, shows great potential in light-emitting diodes (LEDs), benefiting from its environmental friendliness and high chemical stability. However, the poor regulation of the emission spectra severely limits its application range. Herein, various lanthanide ions were successfully doped in Cs2NaScCl6 double perovskite single crystals (DPSCs) to yield effective and stable emissions spanning from visible to near-infrared (NIR) regions. Notably, efficient energy transfer from the host to the dopants enables tunable emissions with good chromaticity, which is rarely reported in the field of lead-free double perovskite. Moreover, density functional theory calculations reveal that the high local electron density around the [LnCl6]3– octahedron in DPSCs plays a key role in the improvement of photoluminescence quantum yields (PLQYs). The optimal PLQYs are up to 84%, which increases around 3 times over that of the undoped sample. Finally, multicolor and NIR LEDs based on Ln3+-doped Cs2NaScCl6 DPSCs were fabricated and had different application functions. Specifically, the single-composite white LED shows adjustable coordinates and correlated color temperatures, while the NIR LED shows good night vision imaging. This work provides new inspiration for the application of efficient multifunctional LEDs based on lead-free double perovskite materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2023
·Vol. 11
·期 5
·1338
·
IF 3.5
Jing Ma,Jingyu Zhao,Tiejun Liu,Cuiling Yang,Yeyun Wang,Jinghui Zhang,Mingfu Li,Yufan Sun
This project designed and created a large-scale pyrolysis incineration system that decomposes waste tributyl phosphate/kerosene (TBP/OK) solvent from the plutonium/uranium process (PU-REX) in the nuclear industry. This system consists of a suspension preparation system (SPS), a pyrolysis and ash discharge system (PADS), and a combustion furnace and gas treatment system (CGS). The preparation of a waste TBP/OK emulsified suspension in the SPS, continuous operation experiments of the PADS and CGS, and pyrolysis incineration experiments were conducted. The results show that the SPS achieved the automatic preparation and feeding of emulsified suspensions at 30 kg/h. The PADS decomposed 99.99% of the TBP/OK emulsified suspensions and fixed more than 99% of phosphorus. The CGS burned the pyrolysis gas without diesel oil and purified more than 99.995% of the radioactive nuclides. This system showed great feasibility, stability, continuity, and safety, proving the compatibility between multiple systems of this new design. This paper marks a significant step in pyrolysis incineration technology for the nuclear industry.Keywords:pyrolysis incineration;TBP/OK;PUREX
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 6
·2123-2134
·
IF 1.6
Ren Fan,Zhang Zhiquan,Xu Guangliang
In this research, composites of ZnO in the form of flowers with ZnFe Prussian blue analogues were prepared by in situ synthesis, and found the synthesis conditions with maximum removal efficiency. The flower-like ZnO enhances the dispersion of the ZnHCF nanoparticles, which means that the Prussian blue analogue has higher adsorption utilisation. In addition, various adsorption experiments revealed that the adsorbent has the best adsorption capacity under neutral aqueous solution conditions and is capable of high removal rate adsorption in multi-ion aqueous solution systems. Apart from this, the adsorption process satisfies a pseudo-second-order kinetic model, indicating that chemisorption dominates, and the Langermuir adsorption model suggests that adsorption occurs on a monolayer and is favourable, with a maximum adsorption capacity of 322.4 mg/g, while adsorption is a spontaneous, heat-absorbing process. Finally, a comparison with other Prussian blue analogues revealed the potential of flower-like ZnO/ZnHCF for efficient removal of Cs + from water.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 16
·2300187
·
IF 9
Nan Zhang,Rui Zhang,Xieming Xu,Fang Wang,Zhicheng Sun,Shuaihua Wang,Shaofan Wu
X-ray flat-panel detectors are widely used for nondestructive detection of internal information in medical radiography and industrial applications. However, a persisting challenge is the application of radiography on highly curved 3D objects to realize flexibility and information storage for the fabrication of flexible large-area X-ray detectors. This study demonstrates a halide-based double perovskite Cs 2 Na 0.9 Ag 0.1 LuCl 6 :Dy 3+ by a hydrothermal reaction. The as-prepared crystals exhibit afterglow features through a co-doping strategy of Dy 3+ and Ag + ions. The double perovskite material with doping modification exhibits excellent scintillation properties with high sensitivity, low detection limit, and high radiation stability. In addition, flexible scintillator detectors are fabricated with an area of 8.0 × 6.0 cm 2 by the blade-coating strategy, which has a high spatial resolution of 11.2 lp mm −1 @MTF = 0.2. Based on the long afterglow properties, the Cs 2 Na 0.9 Ag 0.1 LuCl 6 :Dy 3+ flexible film exhibits thermoluminescence after turning off the X-ray, thereby having strong potential for X-ray imaging of nonflat and irregular objects.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Shiyao Lu,Jian Zhang,Hao Meng,Xiaoyuan Qin,Jianbin Huang,Yehao Liang,Feng-Shou Xiao
Dehydration of methyl lactate (ML) obtained from biomass is a sustainable route for the production of methyl acrylate (MA). Herein, we demonstrate that cesium-exchanged Al-rich Beta zeolite (Cs-Beta) is highly efficient for the dehydration of ML to MA, exhibiting full ML conversion with 87.4% MA yield at 340 °C. In situ FT-IR spectra and kinetic studies provide evidence that the ML dehydration on the Cs-Beta zeolite follows a forward ion-exchange/dehydration/reverse ion-exchange reaction pathway. Model experiments, DFT calculations, TG-DSC analysis, and FT-IR spectra showed that coke formation competes with the dehydration of ML to MA. Kinetic studies and theoretical simulations demonstrate that cesium cations in the micropores of Beta zeolite have a strong steric hindrance, suppressing the formation of oligomers and coke. These results offer new insights for developing highly selective and stable catalysts for the dehydration of ML to MA in the future.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 23
·7654-7661
·
IF 6.4
Jinchan He,Xiao Zhang,Cong Xie,Hsueh Shih Chen,Ping Yang
Because of their inherent ionic properties, inorganic cesium halide lead perovskite nanocrystals (NCs) are normally unstable in light and heat environments as well as polar solvents, which seriously limit their practical application. In this paper, AlO(OH) nanosheets were assembled into hollow mesoporous spheres to encapsulate CsPbX3 NCs for increasing stability according to the powerful adsorption of AlO(OH) on Pb ions. The hollow AlO(OH) assemblies were created via hydrothermal synthesis. The in situ growth of CsPbX3 NCs in AlO(OH) assemblies was then finished in dimethylformamide solutions. After encapsulation, the stability of the NCs was greatly improved and the exchange reaction of halogen ions was effectively prevented. The NCs in the assemblies exhibited high PL quantum yields (PLQYs). Namely, blue-, green-, and red-emitting CsPbX3 (X = Cl, Br, and I)@AlO(OH) composites were fabricated. The composites were further mixed with polystyrene (PS) to prepare a flexible photoluminescent (PL) film with excellent bendable and foldable properties. The initial PLQYs of blue-, green-, and red-emitting CsPbX3@AlO(OH) composites were found to be 48.2, 96.4, and 43.7%, respectively. The films revealed high stability against water because of the excellent hydrophobic properties of PS. These emitting films were made into bands of various shapes, in which their well-flexible nature endowed the films with important applications.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Xupeng Zhu,Jun Zhang,Jun Liao,Qiang Ru,Wenfeng Fu,Zhiguo Wang,Shuwen Xue
Return to the physics origin of Cu 2 ZnSnS 4 type (CZTS-type, include CZGS, CZGTS, CZTSSe, etc.) material system, studying the influence of replacement elements on the optoelectronic properties by preparing high-quality single crystal materials to clarify the relationship between the key defect states of materials and carrier dynamics is the only way which must be passed to find efficient paths to improve the existing performance of CZTS-type optoelectronic devices. Herein, the optical behavior of high-quality Cu 2 ZnGe x Sn 1-x S 4 (CZGTS) single crystal prepared by the molten salt method and its relationship with Ge content were systematically studied using a photoluminescence (PL) and absorption tests at room temperature. Combined with the simple electrical tests, the transformation of carrier recombination mechanism as increasing the Germanium content in CZGTS single crystal before and after phase transition were reported for the first time. The transmission electron microscopy images, X-ray diffraction spectra and Raman scattering spectra of CZGTS were adopted to reveal the evolution mechanism of single crystal growth and phase transition caused by the change of Ge composition. The results show that the tunable blue-shift of PL peak emerges with the increase of Ge content and the excitation power dependence has a saturation phenomenon in the CZGTS single crystal particles. In consideration of the optical bandgap, PL peak position, PL intensity, carrier lifetime and the macroscopic resistivity, it is confirmed that the intrinsic PL behavior could be effectively tailored by different Ge amounts. Compared with the recombination PL of interband carrier (E p > E g ) in Cu 2 ZnSnS 4 , the band tailed carriers (E p < E g ) dominated by defect states would play a powerful role in CZGTS single crystal. Our work provides a strategy for tailoring the bandgap of CZGTS materials and a new perspective for understanding the influence of defect states on carrier dynamics.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6220-6226
·
IF 6.4
Dayu Huang,Ziyong Cheng,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The lattice defects that occur in material preparation processes are closely related to carrier migration. The carrier migration can be regulated by artificially modulating the defects to improve the luminescence performance, which is important for the development and application of luminescent materials. Here, we achieved a 3.29-fold increase in the high-temperature luminescence intensity by introducing Mn2+ to generate Cl vacancy defects in Cs2CdCl4. Due to thermally induced electron de-trapping, Cs2CdCl4:Mn2+ also displays anti-thermal quenching (ATQ) behavior and good thermal quenching resistance (329% at 175 °C). The increase in the photoionization effect and de-trapping of the captured electrons from shallow trap states were appropriately attributed to this exceptional phenomenon, based on thermoluminescence (TL) analysis. Based on comprehensive optical characterization, thermoluminescence and temperature-dependent X-ray diffraction (XRD), we reveal that the Cl vacancy trap state generated by Mn doping is the reason for the enhanced PL in air. The discovery of these materials helps to better understand the optical properties of all-inorganic perovskites.
✓ 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）