JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yun-Yun Gao,Xiao-Feng Guo,Lan-Rong Zhao,Shi-Hua Sang
The stable phase equilibria of the ternary system MgBr2 + SrBr2 + H2O at 288 and 308 K were studied with the isothermal dissolution equilibrium method. The compositions of solutions and solid phases have been determined and the equilibrium solid phases at the invariant points were identified with the aid of the X-ray diffraction method. The phase diagrams of this system at 288 and 308 K were both constructed in terms of experimental results. Two stable phase diagrams show that this system is hydrate type I at two temperatures without formation of a solid solution or complex salt. Both the phase diagrams are composed of one invariant point, two univariate curves, and two crystallization regions (SrBr2·6H2O and MgBr2·6H2O). The equilibrium solid phases of the invariant point at 288 and 308 K are both SrBr2·6H2O and MgBr2·6H2O, respectively. Combining the Pitzer single-salt parameters of MgBr2 and SrBr2 reported in the literatures, the unreported mixing ion-interaction parameters θMg,Sr and ΨMg,Sr,Br at 288 and 308 K were fitted with the measured values in this study using the Pitzer equations. The agreement between the experimental values and calculated results in the ternary system MgBr2 + SrBr2 + H2O at 288 and 308 K shows that the parameters fitted with solubilities are reliable.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xue-ping Zhang,Wei Wang,Han-zhong Zhang,Shi-hua Sang
In this paper, the stable phase equilibrium data of the ternary system CaBr2-SrBr2-H2O at T = 273, 298, and 323 K and 101.3 kPa have been determined by isothermal the dissolution equilibrium method. The phase diagrams of them at the investigated temperatures have been drawn. It is found that the isothermal phase diagrams of the CaBr2–SrBr2–H2O system at T = 273, 298, and 323 K are classified as a simple co-saturation type consisting of an invariant point and two univariant curves. The equilibrium solid phases corresponding to an invariant point of the system were detected as CaBr2·6H2O + SrBr2·6H2O at 273 and 298 K and those identified as CaBr2·4H2O + SrBr2·6H2O at 323 K. In this system, calcium bromide exhibits a strong salting-out effect on strontium bromide. Furthermore, isothermal solubilities at three temperatures were compared and discussed.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Bin Yu,Songxue Bai,Zhenglin Jia,Haitao Tang,Yong Liu,Hailin Liu,Qianqian Lin
Organic–inorganic hybrid metal halides have recently emerged as promising candidates for X-ray imaging, benefiting from their low-cost, high X-ray attenuation coefficient, and high light yield. However, achieving transparent scintillators remains extremely challenging, which is required for high-resolution X-ray imaging in medical and industrial detection. Glassy materials typically have high optical transparency, and more importantly, they can be easily processed into different shapes and scaled up proportionally for large-scale production. Here, large-area, flexible, and transparent scintillators are developed that have ideal optical properties such as high emissivity and low self-absorption. The obtained glassy scintillators exhibit a high transmittance of 90% in the range 450–800 nm, which is very promising for X-ray imaging. A high spatial resolution of 22.2 lp·mm–1 and a low detection limit of 48.39 nGyair·s–1 were achieved based on the optimized perovskite glass scintillators. Additionally, the phosphonium-based scintillators exhibit remarkable stability under continuous X-ray illumination. The melt-quenching approach is also suitable for upscaling with excellent reproducibility, which addresses the critical issues of perovskite scintillators facing commercialization.
研究领域:
材料科学
·
医学影像
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Pengfei Xu,Qianfeng Li,Ye Chen,Changling Yan,Gongke Wang
Perovskite materials exhibit significant potential in optoelectronic devices, biomedical applications, and fluorescent probes. However, their inherent sensitivity poses substantial challenges to practical implementation. In this study, we synthesized strontium-doped perovskite quantum dot (CsPbBr₃:Sr QDs) nanocomposites (CsPbBr₃:Sr QDs/MSNs) via an in-situ crystal growth method and encapsulated them within mesoporous silica nanospheres to mitigate the limitations of CsPbX₃ QDs in aqueous and polar environments. When dispersed in aqueous solutions for over one month, these nanocomposites demonstrated minimal changes in fluorescence characteristics. Under more stringent conditions (acidic, basic, and elevated temperature environments), the novel perovskite-based inorganic/organic hybrid nanocomposites exhibited superior fluorescence stability. By introducing amino functionalization, the CsPbBr₃:Sr QDs/MSNs-NH₂ achieved selective and stable detection of p-nitrophenol (p-NP), a priority pollutant in water. Due to the inner filter effect (IFE) induced fluorescence quenching mechanism, p-NP exhibited high sensitivity and selectivity within the 0–300 μM range, with a detection limit of 0.74 μM. Furthermore, analysis of actual water samples confirmed that this method offers high recovery rates and low relative standard deviations. This work underscores the promising potential of perovskite-based nanocomposites as effective fluorescent probes for water quality analysis.
研究领域:
材料科学
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环境监测
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纳米技术
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分析化学
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光电子器件
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Nan Li,Yu Xia,Xiao-Ying He,Jia-Cheng Li,Kai-Li Wang,Jing Chen,Chun-Hao Chen,Lei Huang,Yu-Tong Yang,Xin Chen,Yan-Hui Lou,Zhao-Kui Wang
The operational stability of mixed-halide blue perovskite light-emitting diodes (PeLEDs) is fundamentally constrained by intrinsic halide ion migration. Employing single-halide perovskite systems represents a viable route to circumvent this issue, yet solution-processed pure-bromide perovskites typically exhibit undesirable green emission, impeding attainment of high-color-purity blue electroluminescence. Herein, this challenge is addressed through the strategic incorporation of Mg 2+ into the B-site of the pure bromine-based perovskite lattice. This substitution induces a substantial spectral blueshift and promotes phase homogenization by facilitating efficient energy transfer from small-n to large-n phases. Notably, the first systematic investigation and mechanistic elucidation of the origin of bimodal emission in blue PeLEDs is presented. Consequently, the champion PeLED delivers stable deep-blue emission at 464 nm with a maximum external quantum efficiency of 4.76%. This study presents a definitive paradigm for achieving spectrally stable and efficient deep-blue emission from single-halide perovskites. The elucidated mechanism underlying emission bimodality provides critical guidance for future development of blue PeLEDs.
研究领域:
材料科学
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光电子学
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钙钛矿发光二极管
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半导体器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Huiren Zheng,Jize Wang,Junye Pan,Chunyang Zheng,Yuxin Zhang,Ankang Shu,Bin Li,Shaowen Cao,Yong Peng
Underwater photovoltaics plays a pivotal role in photovoltaic applications. However, the underwater solar spectrum differs significantly from that in air, and as water depth increases, solar spectra across various wavebands exhibit distinct attenuation rates. Specifically, the attenuation rate of the red component of sunlight is considerably higher than that of green and blue light (400–600 nm). Thus, under these unique spectral conditions, there is an urgent need to develop stable devices that minimize power conversion efficiency (PCE) loss with increasing water depth. The 4-terminal (4T) structure tandem cell, designed with 2.35 eV CsPbBr3 and 1.63 eV Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3, is prioritized due to its suitable optical response range and low PCE loss with increasing water depth. As CsPbBr3 utilized blue and green light in tandem, which has the highest light intensity underneath water, this study employed doping of SrBr2 into the CsPbBr3 film. This approach reduced the defect density of the film, enhanced carrier transport efficiency, and improved the photoelectric responsivity of the device in the 425–500 nm band. The CsPbBr3 perovskite solar cells that were fabricated demonstrated a high open-circuit voltage of 1.46 V and an exceptional PCE of 7.62%. Additionally, these devices exhibited excellent stability. Consequently, the 4T tandem device achieved PCEs of 15.28, 11.79, and 10.33% at 0, 0.5, and 0.7 m underwater depths respectively, with a variation rate of only 32%. Furthermore, the device demonstrated remarkable stability under working conditions, with an efficiency decay of less than 13% after continuous irradiation for 30 days. These findings suggest that the 4T tandem solar cell holds considerable potential for application in underwater photovoltaics.
研究领域:
材料科学
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能源技术
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光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Kaiyu Zhao,Yafei Guo,Dan Li,Lingzong Meng,Tianlong Deng
Isopiestic molalities and water activities for the commercial absorption refrigerants LiBr and SrBr 2 at 288.15 K were accurately measured using an improved isopiestic method. And the solubilities for the absorption refrigeration systems were determined by the isothermal dissolution equilibrium method, meanwhile, the refractive indices and densities were measured. The Pitzer and HW model was used to correlate the measured water activities and solubilities, simulate the thermodynamic properties and predict the data in the phase equilibrium process for the absorption refrigeration systems, and the predicted data agreed well with the experimental solubilities. On the basis of the Pitzer ion-interaction parameters and solubility product constant ( K sp ) obtained in this work, the ion-interactions between alkali metal ions with Sr 2+ and phase equilibrium behaviors were illustrated on the molecular level, which could give an essential guide for the designing of absorption refrigeration system.
研究领域:
化学工程
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Yudi Wang,Xiya Yang,Xueping Yu,Jialong Duan,Qianming Yang,Yanyan Duan,Qunwei Tang
The in-depth understanding on the electrification behavior of dielectric materials is a prerequisite to improve their surface triboelectric charge density in triboelectric nanogenerators (TENGs). Herein, triboelectric charging affinities and polarities of all-inorganic cesium lead tri-bromine (CsPbBr 3 ) and alkaline earth ions doped CsPb 1- x M x Br 3 (M = Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , x = 0–1) perovskites are systematically investigated by assembling into vertical contact-separation TENGs. An enriched triboelectric series supplemented with pristine CsPbBr 3 and CsPb 1- x M x Br 3 perovskites with quantified triboelectric charging polarity is presented through analyzing the electrical output performances, figure-of-merits (FOM), dielectric property , work function, bond energy and electron binding energy. Systematical analyses of three different configurations of dielectric/perovskite TENG, carbon/perovskite TENG and perovskite solar cell are compared in dark and under illumination. It is found that the photoinduced charges play significant role in enhancing the triboelectrification charges and altering charging polarity of perovskite. Our work supplements inorganic perovskites to triboelectric series and provides new insights on inorganic perovskite in the foundation of tribo-photovoltaic theory and triboelectric devices.
研究领域:
材料科学
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能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1783
·
IF 3.4
Chuanqi Liu,Wen Zhang,Dingyu Yang,Haibo Tian,Jun Zhu
The all-inorganic perovskite cesium lead bromine (CsPbBr3) has attracted much attention in the field of X-ray detectors because of its high X-ray absorption coefficient, high carrier collection efficiency, and easy solution preparation. The low-cost anti-solvent method is the main method to prepare CsPbBr3; during this process, solvent volatilization will bring a large number of holes to the film, leading to the increase of defects. Based on the heteroatomic doping strategy, we propose that Pb2+should be partially replaced by Sr2+to prepare leadless all-inorganic perovskite. The introduction of Sr2+promoted the ordered growth of CsPbBr3in the vertical direction, increased the density and uniformity of the thick film, and achieved the goal of CsPbBr3thick film repairing. In addition, the prepared CsPbBr3and CsPbBr3:Sr X-ray detectors were self-powered without external bias, maintaining a stable response during on and off states at different X-ray dose rates. Furthermore, the detector base on 160 µm CsPbBr3:Sr had a sensitivity of 517.02 µC Gyair−1cm−3at zero bias under the dose rate of 0.955 µGy ms−1and it obtained a fast response speed of 0.053–0.148 s. Our work provides a new opportunity to produce cost-effective and highly efficient self-powered perovskite X-ray detectors in a sustainable way.Keywords:X-ray;self-powered detectors;perovskite thick film;Sr-doped CsPbBr3
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
Chemical Science
·
2023
·Vol. 14
·期 33
·8914-8923
·
IF 8.4
Keqiang Chen,Zixin Gu,Zhiqing Wang,Mengyu Guan,Xiu Tan,Wanqing Xu,Xinyu Ji,Weiqi Lu,Yueli Liu,Guogang Li
Recently, the polarization effect has been receiving tremendous attention, as it can result in improved stability and charge transfer efficiency of metal-halide perovskites (MHPs). However, realizing the polarization effect on CsPbX3 NCs still remains a challenge. Here, metal ions with small radii (such as Mg2+, Li+, Ni2+, etc.) are introduced on the surface of CsPbX3 NCs, which facilitate the arising of electric dipole and surface polarization. The surface polarization effect promotes redistribution of the surface electron density, leading to reinforced surface ligand bonding, reduced surface defects, near unity photoluminescence quantum yields (PLQYs), and enhanced stability. Moreover, further introduction of hydroiodic acid results in the in situ formation of tert-butyl iodide (TBI), which facilitates the successful synthesis of pure iodine-based CsPbI3 NCs with high PLQY (95.3%) and stability under ambient conditions. The results of this work provide sufficient evidence to exhibit the crucial role of the surface polarization effect, which promotes the synthesis of high-quality MHPs and their applications in the fields of optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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