Nanoscale
·
2023
·Vol. 15
·期 12
·5696-5704
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IF 6.7
Linxiang Yang,Qingsong Shan,Shuai Zhang,Yihui Zhou,Yan Li,Yousheng Zou,Haibo Zeng
Anion-exchange reactions are recognized as a vital and facile post-synthesis method to precisely manipulate the emission spectra of perovskite quantum dots (QDs). However, the anion-exchange process often induces adverse structural evolution and trap-mediated mechanisms, so mixed-halide perovskite QDs suffer inefficient anion exchange and poor spectra-stability issues, which limits access to high-quality primary color perovskite QDs for display applications. Here we report an Al3+ bonding-doping synergistic strategy for manufacturing stable mixed Br/Cl deep-blue perovskite QDs. By doping Al3+ into perovskite QDs, highly-efficient Cl− anion exchange and a large-range blue shift of the PL spectrum (∼62 nm with only 0.1 mmol of Cl feed) can be easily achieved. Notably, the Al3+-mediated deep-blue emission sample exhibits superior stability against moisture and electric fields. It also shows an elevated valence band maximum level. Based on the anion-exchanged QDs, a spectrum-stable deep-blue QLED with an EQE of 1.38% at 463 nm is achieved. Our findings demonstrate a feasible and promising strategy for developing high-performance deep-blue perovskite materials and optoelectronic devices.
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DESALINATION
·
2022
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IF 11.211
Xiaoxiang Cheng,Yongrui Zhang,Senlin Shao,Cunxian Lai,Daoji Wu,Jingtao Xu,Xinsheng Luo,Daliang Xu,Heng Liang,Xuewu Zhu
Positively charged nanofiltration (NF) membranes have been vitally employed to treat heavy metal ions contained in wastewater. Nevertheless, positively charged NF membranes possessing both high permeance and rejections continue to be a bottleneck in engineering applications owing to the trade-off between rejection and permeance. Herein, a highly permeable and positively charged NF membrane with multilayer structures was prepared using a chitosan interlayer-assisted low-temperature interfacial polymerization and surface grafting polyethyleneimine (CIL-IP-P) strategy. The chemical components, surface morphologies , and separation characteristics of the prepared NF membranes were investigated systematically. The construction of a chitosan interlayer increased hydrophilicity and influenced the IP reaction by modulating the monomer diffusion. Grafting polyethyleneimine (PEI) further resulted in NF membranes with higher electro-positivity, larger specific surface area, and narrower average pore diameter . Hence, the trade-off between rejection and permeance in conventional positively charged NF membranes was surmounted. An excellent water permeance of 10.9 ± 0.6 L m −2 h −1 bar −1 and a satisfactory rejection for heavy metals (93.3, 92.8, 91.0, 90.4, and 89.2 % for Ni 2+ , Mn 2+ , Cu 2+ , Cd 2+ , and Pb 2+ ) were observed. The CIL-IP-P strategy provided in this study is promising to tailor a high-performance positively charged NF membrane for fast heavy metal removals.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuxia Xu,Ting Xu,Yang Guo,Weiping Liu,Juan Wang
Solar-driven interfacial evaporation (SIE) based on pumping bottom water up to air–water interface for localized heating has raised abundant research interest for clean water production. However, when encountering oil-contaminated water, the oil may block the water transport channels and suppress the water evaporation performance. Here, inspired by the surface structure of mussel, we developed a biomimetic surface coating on a polypyrrole-coated cotton fabric (PGCF) based on the reaction of gallic acid/(3-aminopropyl)triethoxysilane (GA/APTES). GA with the pyrogallol moiety can generate a similar mussel-inspired adhesive coating with the aid of APTES that possesses amino groups mainly through Michael addition/Schiff base reactions. The biomimetic coating with micro- and nano-scale roughness renders the PGCF superhydrophilicity and underwater superoleophobicity, and the obtained flexible fabric showed a stable and efficient water evaporation rate of ∼ 1.54 kg m -2 h −1 , in pure water and oil-contaminated water including soybean oil, silicone oil, hexadecane, lubricating oil and their mixtures. Moreover, the fabric demonstrates good reusability, and stability against acidic/alkaline/salty environment, providing a simple and easily scalable strategy for the fabrication of flexible SIE fabric for practical use.
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JOURNAL OF LUMINESCENCE
·
2023
·
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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ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Songman Ju,Chaomin Mao,Yang Liu,Yangbin Zhu,Zhongwei Xu,Kaiyu Yang,Tailiang Guo,Hailong Hu,Fushan Li
Perovskite quantum dots light-emitting diodes (PQLEDs), due to the advantages of high luminous efficiency, high color purity, adjustable spectral range, etc., has an excellent prospect in the next generation of high-definition displays. As an indispensable part of displays, blue PQLEDs are usually achieved by mixing halogen, which, however, will lead to halogen ion migration and phase separation of perovskite material at high temperature and bias pressure, thus make the electroluminescent spectrum redshift. In this manuscript, we propose a strategy to inhibit phase separation of blue perovskite quantum dots (PQDs) by introducing alkali metal , and obtain stable perovskite quantum dot light-emitting diodes. The PQLEDs based on this strategy show an external quantum efficiency (EQE) of 1.87% and a brightness of 3757 cd m −2 , and can still guarantee stable electroluminescence (EL) spectra at a bias of up to 14 V. The work is beneficial for probing into the mechanism of suppressing the phase separation of mixed halogen blue PQDs and offer a promising strategy to enhance the color stability of blue PQLEDs.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
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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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yanping Liu,Yan Zhan,Beata Szreniawa,Katarzyna Matras-Postolek,Ping Yang
Perovskite nanomaterials with highly stable and bright emission were requested for white light emitting diodes (LEDs). In this paper, superior thin CsPbBr 3 nanoplates (NPLs) with an average thickness of 1.9 nm were synthesized via solvothermal reactions. A bright blue-emitting peak at 455 nm with a photoluminescence (PL) quantum yield of 89 % was observed. The high PL efficiency was kept after storing for 90 days at ambient condition. This supplied an efficient approach to solve the problem of low PL efficiency and poor stability of blue-emitting perovskite nanocrystals . The thickness of CsPbBr 3 NPLs was adjusted by changing preparation conditions. The PL peak wavelength of CsPbBr 3 NPLs was adjusted in a region of 455–465 nm. Through dynamic anion exchange promoted cation exchange reactions, Mn ions were introduced in the lattice of CsPbBr 3 NPLs to generate bright orange emitting to create dual-luminescent CsPbBr 3 :Mn NPLs. A white emitting sample with a color coordinate of (0.304, 0.325) was finally fabricated using bright CsPbBr 3 :Mn NPLs and green-emitting CsPbBr 3 nanocrystals. This work broadened the application of perovskite for display and lighting.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Tingting Li,Guoqiang Guo,Haoming Xing,Yiru Wang,Xinyu Luo,Linfan Wang,Chenjie Gu,Yafei Hou,Da Chen
The appearance of multi-drug resistant Escherichia coli makes the combination of tetracyclines (TCs) and quercetin (QCT) more common to fight stubborn bacterial infections so that the effective detections of TCs and QCT are essential and necessary. Here, a novel fluorescence probe for differentiating TCs and QCT is developed based on the nitrogen and copper co-doped carbon dots (N, Cu-CDs). The N, Cu-CDs are prepared from ethylene diamine tetraacetic acid (EDTA) and anhydrous copper chloride as precursors through hydrothermal process and exhibit bright blue fluorescence with excellent optical stability. With the presence of four tetracyclines (DOX, TC, CTC and OTC), the fluorescence intensity of N, Cu-CDs is quenched directly due to the internal filtration effect (IFE), and the detection limit obtained through single-signal fluorescence sensing is as low as 23.8 nM for DOX , 37.2 nM for TC, 43.8 nM for OTC and 28.8 nM for CTC. More remarkably, three dimensional ratiometric fluorescence probe for detecting QCT is proposed based on the appearance of another emission at (410 nm, 490 nm) due to electron transform (ET) process. This new method shows a good linear relationship in the range of 10–100 μM with a low detection limit of 59.3 nM. Furthermore, a dual-channel fluorescence sensing platform based on microfluidics paper-based analytical devices (μPADs) is developed for simultaneously visual discrimination of TCs (DOX is chosen as the typical detecting model for TCs) and QCT. This investigation provides a new way for the development of CDs as multifunction fluorescence probes.
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ACS Applied Materials & Interfaces
·
2022
·
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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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiejun Ren,Xiaopeng Zhou,Yuhua Wang
Metal halide perovskite quantum dots (PQDs) are considered as promising candidate for the next generation optoelectronic applications. However, their development is severely restricted by their poor stability. Here, we demonstrate the in situ growth of PQDs in the ordered channels of functionalized covalent-organic frameworks (COFs). The strong S-Pb chemical binding firmly anchors the PQDs in COF matrix, which prevent the aggregation of PQDs and eliminate the nonradiative trap centers of PQDs, leading to the high photoluminescence quantum yield (81.5 %) and remarkable stability. Femtosecond transient absorption spectroscopy reveal the elimination of nonradiative trap centers in PQD@COFs. Theoretical simulation results demonstrate the strong waveguide effect in PQD@COFs, which reduces the reabsorption loss. Further, the obtained white light-emitting diode exhibits ultrahigh luminous efficiency of 89.6 lm/W and excellent operating stability, which paves the way for the commercial application of PQDs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jiafan Zhang,Linfeng Lu,Juan Zhang,Sha Li,Xiaoming Hua,Xiangrong Zhu,Yi-An Ding,Yinyue Lin,Shan-Ting Zhang,Dongdong Li
The power conversion efficiency (PCE) of monolithic perovskite/silicon tandem solar cells has surpassed that of silicon single-junction solar cells recently. Industrial textured crystalline silicon heterojunction solar cells are considered as competitive candidate bottom cells because of their high efficiency and simple process flow. Meanwhile, the front transparent conductive window layers with industrial compatibility and low processing temperature are worth investigating in detail. In this work, zinc-doped indium oxide (IZO) thin films achieved by room-temperature sputtering are studied as a function of sputtering powers. The IZO thin film with the resistivity and electron mobility of 7.2 × 10 −4 Ω cm and 40.03 cm 2 /Vs are obtained under 85 W, which is implemented into the monolithic perovskite/silicon tandem solar cells. A PCE of 19.38% is realized based on the industrial textured silicon heterojunction bottom solar cell and optimized IZO films.
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NANOTECHNOLOGY
·
2022
·Vol. 34
·期 1
·015603
·
IF 3.953
Sunhuizi Cheng,Feng Li,Zixin Fang,Xinhao Rao,Chao Yan,Jianzhuang Yin,Weiwei Zhang,Feng Zhao,Yan Huang
Perovskite quantum dots (QDs) with stable luminous properties are crucial to for the construction of corresponding light-emitting diodes (LEDs). Hybrid halide perovskite QDs, especially those contain iodine element emitting red light, usually demonstrate poor emission stability owing to the halide segregation. Moreover, red component is indispensable for the construction of white LEDs (WLEDs). Hence, it is essential to improve the luminous stability of hybrid halide perovskite QDs containing iodine element. Here, magnesium dopant and silica matrix were employed to improve the stability of hybrid halide CsPb(IBr)3 QDs. Red, green and blue are three primary colors for constructing WLEDs. Therefore, silica-coated CsPbBr3 QDs emitting green light were also synthesized. The fabricated silica-coated Mn:CsPb(IBr)3/PMMA film delivered good emission stability during a 42 d observation period, exhibiting the improved stability compared with the corresponding Mn:CsPb(IBr)3 QDs in solution. WLEDs were fabricated by integrating the mixture of silica-coated Mn:CsPb(IBr)3 QDs, silica-coated CsPbBr3 QDs and silicon sealant with a blue-emission LED chip. The as fabricated device exhibited a longer lifetime to be lit than that of those reported previously. During the 36 d observation period for the as fabricated device, the red emission from the silica-coated Mn:CsPb(IBr)3 QDs experienced a peak-emission shift of 34 nm, which is much less than that in Mn:CsPb(IBr)3 QDs solution. Their overall intensity downtrend combined the peak-emission shift are responsible for the spectrum shape change, so as to the fluctuation of color correlated temperature and color rendering index. Our study provides a good starting point for the further improvement of the stability of the hybrid halide perovskites QDs and the corresponding light-emitting devices. With deep studies on the synthesis method and luminous mechanism for hybrid halide CsPb(IBr)3 QDs, red-emission perovskite QDs with satisfied properties are expected to be obtained.
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