Nanomaterials
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2021
·Vol. 11
·期 12
·3242
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IF 5.076
Yu Sun,Jin Chen,Fengchao Wang,Yi Yin,Yan Jin,Jun Wang,Xiaogai Peng,Ruiyi Han,Canyun Zhang,Jinfang Kong,Jing Yang
Nowadays, Mn-doping is considered as a promising dissolution for the heavy usage of toxic lead in CsPbX3perovskite material. Interestingly, Mn-doping also introduces an additional photoluminescence band, which is favorable to enrich the emission gamut of this cesium lead halide. Here, a solution spraying strategy was employed for the direct preparation of CsPbxMn1−x(Br,Cl)3film through MnCl2doping in host CsPbBr3material. The possible fabrication mechanism of the provided approach and the dependences of material properties on Mn-doping were investigated in detail. As the results shown, Pb was partially substituted by Mn as expected. With the ratio of PbBr2:MnCl2increasing from 3:0 to 1:1, the obtained film separately featured green, cyan, orange-red and pink-red emission, which was caused by the energy transferring process. Moreover, the combining energy of Cs, Pb, and Mn gradually red-shifted resulted from the formation of Cs-Cl, Pb-Cl and Mn-Br coordination bonding as MnCl2doping increased. In addition, the weight of short decay lifetime of prepared samples increased with the doping rising, which indicated a better exciton emission and less defect-related transition. The aiming of current work is to provide a new possibility for the facile preparation of Mn-doping CsPbX3film material.Keywords:MnCl2doping;CsPbxMn1−x(Br,Cl)3;thin films;solution spraying
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2023
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IF 4.6
Mei Hu,Nuerbiye Tuerhong,Zhaohui Chen,Qun Jing,Ming-Hsien Lee
Enthusiasm for the exploration of nonlinear alkali metal borates remains high. Focusing on the Li–B–O–X (X = Cl and Br) system, two examples of noncentrosymmetric borates, Li3B8O13Cl and Li3B8O13Br, were obtained using a high-temperature solution method under vacuum conditions. Structurally, the Li3B8O13X crystals exhibit two independent alternately arranged three-dimensional B–O network structures formed by the basic building block unit B8O16. The performance measurements demonstrate their short ultraviolet cutoff edges. The theoretical calculation indicates that the BO3 units dominate the contribution to their large optical anisotropy with the birefringence, 0.094 and 0.088@1064 nm for Li3B8O13Cl and Li3B8O13Br, respectively.
研究领域:
材料科学
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光学
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晶体学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2023
·
IF 5.9
Yanchao Yu,Yuan Gao,Wenjuan Wang,Hanyang Chen,Yuzhe Yun,Seeram Ramakrishna,Jun Zhang,Yun-Ze Long
Traditional detection methods usually use a spectrometer, which requires a professional tester to operate and is not convenient to carry around. Herein, we designed a 5G smartphone-based portable test sensor that uses a CsPbBr3 composite fibrous membrane prepared by a one-step in situ growth method as the test paper, and the test is realized by taking pictures with the smartphone. This portable detection method requires only one drop of liquid to be detected (<25 μL), which is superior to many detection systems that require a large amount of liquid to be detected (>1 mL). Moreover, the detection sensitivity can reach 0.1 ppm, which is more sensitive than the CsPbBr3 composite fiber membrane prepared by the conventional encapsulated method. In addition, this CsPbBr3 composite fiber membrane is reusable and can still achieve highly sensitive detection with a single drop after 100 uses. This smartphone-based portable test sensor is small in size and easy to use and can be used at home or outdoors anytime and anywhere.
研究领域:
材料科学
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分析化学
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生物医学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xue Zhang,Yanyu Cui,Siyuan Ye,Zhuohan Lin,Yan Li
Two-dimensional (2D) CsPbBr 3 nanoplatelets (NPLs) have attracted great attention as one of promising semiconductor nanomaterials due to their large exciton binding energy and narrow emission spectra. However, the labile ionic and weakly bound surfaces of deep-blue emitting CsPbBr 3 NPLs with wide bandgap result in their colloidal instability, thus degrading their optical properties. It is challenging to obtain deep-blue emitting CsPbBr 3 NPLs with excellent optical properties. In this study, high-quality blue-emitting CsPbBr 3 NPLs with tunable thickness were prepared adopting the DBSA-mediated confinement effect based on the hot-injection method. Thanks to the coordination interaction of − SO 3 − of DBSA ligand and the Pb 2+ on the surface of the CsPbBr 3 NPLs, as well as the effective passivation of Br vacancy defects on the surface of NPLs by OAm-Br, the obtained pure-blue CsPbBr 3 NPLs and deep-blue CsPbBr 3 NPLs show high photoluminescence quantum yield (PLQY) of 92 % and 81.2 %, respectively. To the best of our knowledge, this is the highest PLQY recorded for deep-blue emitting CsPbBr 3 NPLs with two monolayers [PbBr 6 ] 4− octahedra. Furthermore, the agglomeration of CsPbBr 3 NPLs due to ligand loss induced by moisture, oxygen, and irradiation was also suppressed by the dual passivation effect of DBSA and OAm-Br. Our work provided a new approach to developing high-performance and stable deep-blue emitting CsPbBr 3 perovskite nanoplatelets.
研究领域:
材料科学
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纳米技术
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光电学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Junyu He,Tongqing Sun,Min Li,Anshi Chu,Xiujuan Zhuang
The realization of stable single-component white light emission in metal halide perovskites is still challenging due to the fast halide ion migration and narrow luminescence bands. In this work, all-inorganic single CsPbCl x Br 3−x perovskite microplates with stable red-blue-green triple color light emission are prepared by introducing europium ions Eu 3+ as dopants. Eu doping effectively suppresses ion migration and enables two spatially separated halide phases with stable dual-wavelength emissions. Furthermore, the incorporation of Eu 3+ compensates for the absence of red-light emission, thereby yielding a superior white emission with exceptional quality. The color rendering index of triple-color-emitting perovskites can be tuned successfully by controlling the halogen ratios, and the optimal microplate achieved a Commissions Internationale de l’Eclairage (CIE) coordinates of (0.32, 0.32). The results present a new enlightenment for the preparation of low-cost single-component white light materials.
研究领域:
材料科学
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光电
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光子学
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DOI
高影响因子
Chemistry-An Asian Journal
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2024
·Vol. 19
·期 24
·e202400798
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IF 3.5
Haiyun Zhou,Pingping Li,Tingting Zhong,Yunzhen Teng,Siqi Li,Xiaofeng Luo,Xinning Wang,Min Yang,Guowei Deng
Mn doping has been used to improve the physical chemistry of lead halide perovskite nanocrystals such as CsPbX 3 , where X is a halogen ion. In this paper, a two-phase method for Mn-doped CsPbX 3 nanosheets (where X=Br, Cl), namely water-hexane system, is reported. Compared to conventional catalyst arrays, the band gap of CsPbBr 3 nanocrystalline is easily tuned, the carrier diffusion distance is remote, the band edge position of the band structure is favorable for a wide range of electrocatalytic redox reactions, and the catalytic active site is maximally exposed, providing a larger electrolyte contact area. The porous hierarchical structure also accelerates the release of hydrogen bubbles. The results showed that the optimized Mn : CsPbBr 3 catalyst exhibited excellent electrolytic performance of aquatic hydrogen in alkaline electrolyte (1 mol/L KOH). The overpotentials of the oxygen evolution reaction (OER) at the current densities of 10 and 100 mA cm −2 are only 114.4 and 505.4 mV, respectively, with a Tafel slope of 43 mV dec −1 . At a current density of 10 mA cm −2 , the excess potential required for the hydrogen evolution reaction (HER) is 158.6 mV and it exhibits excellent electrochemical stability. The Mn : CsPbBr 3 nanocrystalline consists of two electrodes for hydrolysis of water, requiring only a voltage of 1.45 V. This provides implications for the optimization of electrocatalysts in alkaline electrolytes with the aim of developing next generation 2D electrocatalysts for overall water splitting.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Shiyu He,Aijia Wei,Wen Li,Xue Bai,Lihui Zhang,Xiaohui Li,Rui He,Lili Yang,Zhenfa Liu
The Br − modified LiNi 0.815 Co 0.15 Al 0.035 O 2 (NCA) cathode materials areprepared via a situ doping method for the first time. The structural and electrochemical properties within Br − modified NCA cathode material are in an in-depth analysis. X-ray diffraction (XRD) results show enlarged interslab spacing due to the fact that partial Br − has doped into the bulk particles of NCA to replace O 2− in 6c site. Density functional theory (DFT) calculations suggest that Br − doping mainly occurs in the surface layer. Moreover, the Br ‒ modified NCA cathode materials present smaller primary particles than pure NCA, which is proved by calculations of particle size from random scanning electron microscopy (SEM) images. X-ray photoelectron spectroscopy (XPS) results certify that the the valence state of Ni 3+ is partly reduced to Ni 2+ and residual lithium acts as stable LiBr instead of unstable Li 2 CO 3 at the surface of Br ‒ modified NCA cathode materials. From the electrochemical tests, 0.2 mol% Br − modified NCA with reduced potential polarization, decreasing value of R sf + R ct and increasing Li + diffusion coefficient , exhibits excellent cycling performance, even at elevated temperature. These results clearly indicate that Br − modification contributes to the remarkable enhancement of structure stability and cycling performance of NCA.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Xin Hu,Huiping Zhao,Ying Liang,Rong Chen
Solar-driven molecular oxygen activation is of great importance for reactive oxygen species (ROS) production in environmental remediation. In this work, a convenient bromine doping strategy was developed to mediate the energy level of Bi 2 O 2 CO 3 for molecular oxygen activation. The band structure and DFT calculation demonstrate that the Fermi level of Bi 2 O 2 CO 3 elevates after bromine doping, which promotes the molecular oxygen activation and ROS production. The Br-doped Bi 2 O 2 CO 3 exhibits remarkably enhanced photocatalytic ability and could degrade 95% of the ciprofloxacin within 30 min. Moreover, HPLC-MS analysis elucidates that the pyrrolidone ring degradation process is the dominate pathway in ciprofloxacin degradation over Br-doped Bi 2 O 2 CO 3 , resulting in the decrease of antimicrobial activity of the degradation products and the risk of drug-resistance. This work not only provides a molecular oxygen activation strategy via energy level mediation, but also helps us to further understand the relationship between the elemental doping and molecular oxygen activation.
研究领域:
环境科学
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材料科学
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化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2021
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IF 5.097
Muhammad Amin Padhiar,Minqiang Wang,Yongqiang Ji,Zhi Yang,Yun Zhou,Hengwei Qiu,Hao Wang,Azaz Ali Shah,Arshad Saleem Bhatti
Perovskite nanocrystals (PNCs) are ideal for optical devices due to their adjustable emission band and high photoluminescence. However, blue light-emitting perovskite nanocrystals (PNCs) exhibit poor performance compared to their green and red-emitting PNC counterparts. Herein, we introduce a simple strategy for increasing the stability of blue light-emitting CsPb (Br/Cl)3 PNCs passivated with an Al-doped CdSe layer. This simple strategy successfully achieves highly stable PNCs with photoluminescence (PL) emission ranging from 454 to 460 nm with a full width at half-maximum (FWHM) ranging from 18 to 22 nm; changes in bandgaps are also observed, and the corresponding PLQY values show a significant change after CdSe/Al modification. In addition, CsPb (Br/Cl)3 PNCs with a CdSe layer doped with Al formed on the surface show remarkable stability under ambient conditions, including thermal exposure, water resistance, and ultraviolet (UV) irradiation. A light-emitting diode (LED) device was constructed to demonstrate the feasibility of the approach by combining the optimal CsPb(Br/Cl)3/CdSe/Al PNCs with an existing commercial 365 nm UV chip, resulting in bright blue light emission with CIE color coordinates of (0.16, 0.09). All of the findings suggest that doped CsPb (Br/Cl)3/CdSe/Al PNCs have the potential to be used as color converters in liquid crystal displays (LCDs).
研究领域:
材料科学
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光学工程
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DOI
高影响因子
ENERGY & FUELS
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2026
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IF 6
Jianhao Huang,Hongliang Zhang,Haojie Yang,Haiyang Li,Chao Liu,Gang Li,Binxin Hua,Yefeng Yang,Zhujun Yao
With the increasing demand for high-energy density and high-safety energy storage systems, all-solid-state batteries have emerged as a key development direction for next-generation lithium battery technology. Zirconium-based oxychloride solid electrolytes possess good compatibility with high-voltage cathodes and relatively low material cost. However, their ionic conductivity still requires further improvement. In this work, a series of Li3–xZrCl4O1.5–xBrx electrolytes were synthesized via a ball milling method. Br doping increases the concentration of Li+ vacancies and lowers the migration energy barrier while preserving the amorphous structure. When x = 0.025, the ionic conductivity reaches 3.4 mS cm–1 with an activation energy of 0.239 eV. An all-solid-state battery was assembled using a LiNi0.8Mn0.1Co0.1O2 cathode and a Li–In anode. The cell delivers a discharge capacity of 143 mAh g–1 after 200 cycles at 0.5 C with a coulombic efficiency of 99.9%, indicating excellent cycling stability.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Longxian Zhang,Zhineng Zhou,Lang Wu,Qiaogang Song,Yu Zhuang,Chi Yang,Xintong Zhao,Juchuan Chai,Shurong Wang
The two-step method facilitates perovskite crystallization by pre-generating PbI 2 crystal nuclei and exhibits superior repeatability. Nevertheless, the two-step fabrication process results in a perovskite layer with many grain boundaries and interfacial defects, which act as non-radiative recombination sites, significantly limiting the V OC . At the same time, the quality of the resulting film strongly relies on how effectively organic salts diffuse within the PbI₂ layer. Herein, through a pre-deposition strategy, A pre-deposited NH 4 Br layer at the SnO 2 /perovskite interface effectively modulated the growth behavior of perovskite crystals. This led to the formation of a vertically grown perovskite film, featuring an average grain size of 1.37 μm. The pre-deposited NH 4 Br not only effectively suppressed interface recombination by reducing defect densities and enhanced carrier extraction, but also effectively improved perovskite film crystallinity and reduced PbI 2 content. Furthermore, the pre-deposition strategy extended the average carrier lifetime to 2.3 μs. Finally, perovskite devices based on pre-deposited NH 4 Br layer achieved a power conversion efficiency of 25.46 % and exhibited negligible hysteresis and good stability. In a word, the early incorporation of NH 4 Br at the SnO 2 /perovskite interface provides an effective approach to improving interfacial contact and reducing recombination, thereby enhancing device efficiency and long-term operational stability.
研究领域:
材料科学
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光伏技术
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纳米材料
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表面与界面工程
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半导体器件物理
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2024
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IF 3.3
Junhu Cai,Xiang Zhang,Yu Chen,Wenzong Lai,Wenyan Zhang,Zexi Lin,Yun Ye,Sheng Xu,Tailiang Guo,Jiajun Luo,Enguo Chen
Inorganic metal halide perovskite quantum dots (PQDs) have recently emerged as promising candidates for color conversion materials in Micro-LED displays, due to their outstanding color purity, high absorption coefficient, tunable emission wavelength . However the inferior stability and undesirable photoluminescence quantum yield (PLQY) restrict their particle applications. Herein, CsPbX 3 /PMMA (X = Br, I) composites with improved stability and optical performance were successfully prepared by a general and mild in-situ polymerization strategy. The ester carbonyl (C O) group in MMA formed complexes with Pb 2+ , leading to the in-situ thermal polymerization of polymethyl methacrylate (PMMA) under the action of the initiator. The multifunctional PMMA can efficiently passivate halogen vacancies while acting as a barrier against the degradation caused by heat, water, and oxygen. As a result, the PLQYs and stability of PMMA-coated CsPbX 3 PQDs have been significantly improved. When implementing CsPbX 3 /PMMA/PDMS composites as color conversion layers in Micro-LEDs, they achieve an impressive color gamut of 127.23% with excellent stability. We believe our work will stimulate the exploration of perovskite/polymer composites for industrial Micro-LED applications.
研究领域:
材料科学
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光学工程
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显示技术
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高影响因子
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