JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Kewei Ma,Yuhang Sheng,Guizhen Wang,Xiaowei Zhang,Yunsong Di,Cihui Liu,Liyan Yu,Lifeng Dong,Zhixing Gan
Mn 2+ doping has been developed to modulate the photoluminescence (PL) of CsPbCl 3 perovskite quantum dots (PQDs). However, the doped Mn 2+ may be expelled from the PQDs host with the long-term storing, resulting in inferior stability. Herein, CsPbCl 3 PQDs doped with different concentrations of Mn 2+ (Mn:CsPbCl 3 ) are prepared by a hot injection method. Our photostability tests reveal that when the doping concentration is <25%, or 40%–50%, the Mn 2+ doped PQDs are intrinsically stable. Anion exchange reactions are conducted between the stable CsPb 0.796 Mn 0.204 Cl 3 and CsPbBr 3 PQDs. Fluorescence color gamut of the resulting Mn:CsPb(Cl/Br) 3 PQDs almost covers the entire visible spectrum except for the deep red color. Benefiting from the intrinsic stability and wide color gamut, multicolor solid-state luminescence are acquired by incorporating the Mn:CsPb(Cl/Br) 3 PQDs in polymethyl methacrylate (PMMA) matrices, which are used as color converters for constructing light-emitting diodes (LEDs) with different colors.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yaqi Ding,Neng Gao,Yongping Wu,Yongmei Xuan,Guangming Chen
Calcium chloride (CaCl2) aqueous solution as a liquid desiccant has the disadvantage of low vapor pressure and easy crystallization. Ionic liquids (ILs) such as [Emim]Cl, [Emim]Ac, and [Emim]Br have been verified to have a good ability to reduce the vapor pressure. In this paper, the vapor pressures of four kinds of CaCl2 + ILs + H2O were measured, which were CaCl2 + [Emim]Br + H2O (mass ratio CaCl2/[Emim]Br = 2:1) at temperatures of between 311.10 and 394.45 K, CaCl2 + [Emim]Cl + H2O (mass ratio CaCl2/[Emim]Cl = 2:1) at temperatures of between 306.58 and 393.89 K, CaCl2 + [Emim]Ac + H2O (mass ratio CaCl2/[Emim]Ac = 2:1) at temperatures of between 304.93 and 382.71 K, and CaCl2 + [Emim]NO3 + H2O (mass ratio CaCl2/[Emim]NO3 = 2:1) at temperatures of between 312.46 and 391.80 K, with the mass fraction of solute ranging from 0.2 to 0.5. The Antonie-type equation was used to fit the measured results. The average absolute relative deviation (AARD %) values of the measured vapor pressures and calculated vapor pressures were 0.52, 0.40, 0.33, and 0.27%, which showed good consistency and accuracy. Comparing the vapor pressures of the different solutions at the same concentration, the following order of the four anions with the ability to reduce the vapor pressure of CaCl2 + H2O can be drawn at a mass fraction of 0.4: Br– > Cl– > NO3– > Ac–.
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Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901082
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IF 7.125
Daqin Chen,Su Zhou,Feifan Tian,Haitao Ke,Naizhong Jiang,Shujin Wang,Yongzhao Peng,Yue Liu
Recently, Mn 2+ -doped CsPb(Cl/Br) 3 perovskite nanocrystals (NCs), showing the advantages of dual-color emissions via exciton-to-dopant energy transfer and reduced usage of toxic Pb 2+ heavy metal ions by nontoxic Mn 2+ substitution, are widely explored. However, photoluminescence quantum yields (PLQYs) for Mn 2+ -doped CsPb(Cl/Br) 3 NCs still need to be further improved. Here, a halogen-hot-injection strategy is developed to prepare Mn:CsPb(Cl 0.6 Br 0.4 ) 3 NCs with the maximal PLQY of 65%. With this method, intense blue narrowband emission from excitonic recombination and orange broadband emission from Mn 2+ 4 T 1 → 6 A 1 transition can be simultaneously achieved. The competitive luminescence between perovskite NCs and Mn 2+ dopants is systematically investigated by controlling the injected halogen types and ratios. As a proof-of-concept experiment, the present Mn 2+ -doped CsPb(Cl/Br) 3 perovskite NCs with highly efficient dual-color emissions are demonstrated to be applicable as color converter in UV-excitable solid-state lighting.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·172
·
IF 4.034
Xinyue Lao,Xiyu Li,Hans Ågren,Guanying Chen
Although all-inorganic CsPbX3(X = Cl, Br, I) perovskite quantum dots (PQDs) have evoked exciting new opportunities for optoelectronic applications due to their remarkable optical properties, their emission color tunability has not been investigated to any appreciable extent. In this work, double/triple CsPbX3perovskite quantum dots with precise ratios of Cl/Br or Br/I are synthesized and their luminescence (410–700 nm) is explored. A group of down-converted CsPbX3(X = Cl, Br, I) perovskite quantum dot light-emitting diode (LED) devices were constructed to demonstrate the potential use of such double/triple-halide CsPbX3perovskite quantum dots with full-spectrum luminescence. Based on density functional theory, we theoretically explored the properties of CsPbX3with double/triple anion atoms. The calculated band gaps provided strong support that the full-spectrum luminescence (410–700 nm) of double/triple CsPbX3can be realized with the change of the mixed-halide ratios, and hence that such PQDs are of potential use in optoelectronic devices.Keywords:perovskite quantum dots;light-emitting diode;density functional theory;band gap
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PEST MANAGEMENT SCIENCE
·
2024
·
IF 3.8
Yuecheng Zhao,Lu Zhang,Chuanshan Zou,Huilin Han,Chengde Li,Xingpeng Li,Liwen Song
BACKGROUND Cuticular proteins (CPs) play essential roles in forming cuticular structures in insects. However, the specific functions and regulatory mechanisms of CPs remain largely unexplored. In this study, the Larval cuticular protein 17 ( HcLCP-17 ) gene was identified from Hyphantria cunea , a highly destructive and polyphagous forest pest. To investigate the role of HcLCP-17 in cuticular function and transcriptional regulation mediated by 20E-responsive transcription factors (ERTFs), we employed RNA interference (RNAi) and yeast one-hybrid assay techniques. Additionally, we examined the molecular mechanism by which chlorbenzuron, a type of benzoylphenylurea (BPU) that functions as a chitin synthesis inhibitor (CSI), affects the 20E signaling pathway and ultimately regulates HcLCP-17 expression. RESULTS HcLCP-17 encodes a polypeptide consisting of 393 amino acids, which includes a chitin-binding domain. Silencing HcLCP-17 resulted in a disturbance in the structural organization of the larval cuticle and a notable reduction in chitin levels. HcLCP-17 expression was controlled by the interaction between Broad-Complex (Br-C) and beta Fushi Tarazu Factor-1 (βFTZ-F1) with its promoter fragment. Furthermore, the inhibitory effect of chlorbenzuron on HcLCP-17 expression was found to be potentially mediated by Br-C and βFTZ-F1. CONCLUSION The study presents a novel mode of action for the 20E signaling pathway in regulating the expression of CPs and reveals the potential mode-of-action of BPUs in insect cuticles. These findings provide a theoretical basis for future utilization of LCP-17 as a pesticide target making a significant contribution to the development of effective pest management strategies. © 2024 Society of Chemical Industry.
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POLYMER COMPOSITES
·
2024
·
IF 4.8
Jiawei Yang,Feifei Wang,Chaobo Liang,Shaofeng Zhou,Jin Huang,Guizhe Zhao,Yaqing Liu
Carbon black (CB) with different structural parameters together with graphene oxide were formed into uniformly dispersed filler network for enhancing the abrasion resistance of natural rubber/cis-1,4-polybutadiene rubber/trans-1,4-poly(isoprene-butadiene) rubber blended composites. It showed that the CB structural parameters, such as specific surface area, surface activity and structural degree affected the formation of bound rubber. With the increase of bound rubber content, the homogeneity of filler network structure was improved and the filler-rubber interaction was enhanced, resulting in a remarkable increase in the mechanical properties, thermal performance and abrasion resistance of the composites. Among the different types of CB, the composites filled with high-structural-degree CB of N134 had DIN wear volume as low as 76 mm 3 and exhibited 19.5% higher abrasion resistance than N330. Wear surface observations and wear mechanism analyses showed that the increase in abrasion resistance was related to the improvement in tear resistance, hardness and thermal properties of the composites. Multiple linear regression analyses yielded that the structural degree in the structural parameters of CB had a significant correlation effect on the formation of bound rubber, and there was a strong linear relationship between the abrasion resistance of the composites and the content of bound rubber. Highlights Trans-1,4-poly(isoprene-butadiene) rubber as compatibilizer for NR/BR blends. Synergistic enhancement of rubber using carbon black and graphene oxide. Carbon black with high structural degree promotes the formation of bound rubber. Described correlation between CB structural parameters and abrasion resistance of rubber.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Zhongyuan Li,Mengdi Xu,Wuqi Liu,Xuesong Wang,Ye Li,Xianju Zhou,Zhen Fang,Lixin Ning
Broadband near-infrared (NIR) luminescent materials hold the key to next-generation, smart, NIR light sources. The emerging halide perovskite materials are regarded as promising candidates for optoelectronics because of their superior optical properties and easy solution processability. However, it remains a major challenge to realize efficient and thermally stable broadband NIR luminescence in these materials. Herein, we report a novel strategy to achieve broadband NIR luminescence by utilizing the transitions from the lowest 1T2 level of Mo4+ to the components of its 3T1 ground state in the soft Cs2Zr(Cl,Br)6 lattice. The multiple transitions, each occurring within the (4d2) t22 crystal-field configuration and containing zero-phonon and vibronic contributions, superimpose on each other to generate the broadband NIR emission. The emission spectrum encompasses the long wavelength region from 800 to 1400 nm centered at 970 nm with a full width at half-maximum of 170 nm. More importantly, the title NIR phosphor shows an exceptional quantum efficiency (66.9%) and thermal stability (67%@150 °C). The as-fabricated NIR phosphor-converted light-emitting diode shows great potential as an NIR lighting source. This research opens a new horizon for realizing high-performance broadband NIR luminescence by exploiting multiple electronic transitions of activators in the soft lattice.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jin Wang,Xu Guo,Qixiang Zhou,Yan Cai,Bing Lu,Yang Wang,Yong Yao
The functional photoelectric materials based on bismuth oxyhalides (BiOX, X = Cl, Br and I) have been widely used in the field of photo-electrochemistry (PEC) due to their excellent physical, chemical and optical properties. Herein, a series of BiOX nanoflowers conjugated water-soluble pillar[5]arenes functionalized Au (Au@WP5/BiOX) modified PEC sensor are constructed and investigated for the PEC detection of serotonin. Upon exploring the physical properties, such as size, visible light absorption capacity, band gap and impedance, of the three BiOX materials, it is discovered that BiOBr is more effective in detecting 5-HT due to its high redox ability, moderate band gap (∼2.03 eV), and low impedance. BiOBr can provide a high and stable starting photocurrent compared to the other two bismuth oxyhalides. When used in acidic or neutral environments, 5-HT with a positive charge can undergo electrostatic adsorption and host-guest complexation behavior with WP5, which has a negative charge. By using WP5, the recognition ability of the material to 5-HT molecules can be enhanced, and the adsorption of 5-HT molecules on Au@WP5/BiOBr can be accelerated. The local surface plasmon resonance effect (LSPR) of gold nanoparticles (Au NPs) can accelerate the electrochemical reaction rate and charge transfer rate, which ultimately leads to the amplification of the photocurrent signal. As a result, the 5-HT detection sensor based on Au@WP5/BiOBr has a wide detection range from 0.01 to 100 μM and a low detection limit of 3 nM (S/N = 3) compared to other sensors, including Au@WP5/BiOCl and Au@WP5/BiOI. The proposed PEC sensor also exhibits good stability and selectivity, making it a promising strategy for detecting biological small molecules using pillar[5]arene functionalized PEC active materials.
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ADVANCED MATERIALS
·
2022
·Vol. 35
·期 8
·2209002
·
IF 32.086
Jibin Zhang,Tiankai Zhang,Zhuangzhuang Ma,Fanglong Yuan,Xin Zhou,Heyong Wang,Zhe Liu,Jian Qing,Hongting Chen,Xinjian Li,Shijian Su,Jianing Xie,Zhifeng Shi,Lintao Hou,Chongxin Shan
Pure-red perovskite LEDs (PeLEDs) based on CsPb(Br/I) 3 nanocrystals (NCs) usually suffer from a compromise in emission efficiency and spectral stability on account of the surface halide vacancies-induced nonradiative recombination loss, halide phase segregation, and self-doping effect. Herein, a “halide-equivalent” anion of benzenesulfonate (BS – ) is introduced into CsPb(Br/I) 3 NCs as multifunctional additive to simultaneously address the above challenging issues. Joint experiment-theory characterizations reveal that the BS – can not only passivate the uncoordinated Pb 2+ -related defects at the surface of NCs, but also increase the formation energy of halide vacancies. Moreover, because of the strong electron-withdrawing property of sulfonate group, electrons are expected to transfer from the CsPb(Br/I) 3 NC to BS – for reducing the self-doping effect and altering the n-type behavior of CsPb(Br/I) 3 NCs to near ambipolarity. Eventually, synergistic boost in device performance is achieved for pure-red PeLEDs with CIE coordinates of (0.70, 0.30) and a champion external quantum efficiency of 23.5%, which is one of the best value among the ever-reported red PeLEDs approaching to the Rec. 2020 red primary color. Moreover, the BS – -modified PeLED exhibits negligible wavelength shift under different operating voltages. This strategy paves an efficient way for improving the efficiency and stability of pure-red PeLEDs.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xiaoting Guo,Jinping Song,Jianhua Xue,Qi Ma
Sunset Yellow (SY), a widely used food additive, poses health risks when consumed in excess. Therefore, it is necessary to develop method for the detection of SY in different foodstuffs. In this study, we synthesized concentration-tunable nitrogen and bromine co-doped functional carbon quantum dots (CQDs) through a simple solvothermal method utilizing Tetrabromophthalic anhydride and Ethylenediamine. The synthesized CQDs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV–Vis absorption spectra and fluorescence spectrophotometer. Notably, the CQDs exhibited a high fluorescence quantum yield of 25.85 %, and their fluorescence was effectively quenched by SY, thus enabling the development of a fluorescent probe for SY detection. Consequently, a novel fluorescent probe was established with a linear range of 0.03–100 μmol/L and a limit of detection (LOD) of 0.01 μmol/L. This probe was validated for SY quantification in various food samples, achieving recovery rates between 98.27 % and 108.67 %, with a relative standard deviation (RSD) of less than 3.76 %, indicating promising application prospects.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Mingquan Liu,Yingying Jiao,Junchao Qin,Zhongjun Li,Jianshe Wang
Nonmetals doping are effective for adjusting the electronic and molecular structures of C 3 N 4 nanosheets (CN), which could broaden the range of visible light response and improve the photo-induced electron-hole separation. Here a series of nonmetals (S, P, F and Br) doped C 3 N 4 nanosheets (x-CN) decorated with boron doped C 3 N 4 nanodots (BCNDs) was prepared for the first time. Compared with the pristine nonmetals doped CN, the integrating of BCNDs with x-CN can effectively facilitates the charge separation and transfer in the photocatalytic process, and endows enhanced photocatalytic activity for hydrogen production. The maximum photocatalytic hydrogen production rate of the BCNDs/S-CN, BCNDs/P-CN, BCNDs/F-CN and BCNDs/Br-CN composite can reach 3924.81 μmol·g −1 ·h −1 , 2387.62 μmol·g −1 ·h −1 , 2374.06 μmol·g −1 ·h −1 and 3471.56 μmol·g −1 ·h −1 respectively, which is about 3.3, 4.3, 4.0 and 3.1 times that of their counterparts, respectively. This work demonstrates that BCNDs plays an important role to improve the photocatalytic properties by forming 0D/2D isotype heterojunction with nonmetals doped C 3 N 4 nanosheets and provides new members for heterojunction photocatalysts, which is conductive to further fundamental and applied research.
研究领域:
材料科学
·
化学
·
纳米技术
·
能源科学
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高影响因子
JOURNAL OF NUTRITIONAL BIOCHEMISTRY
·
2026
·
IF 5.2
Yan-Ni He,Shi-Ying Li,Pei Xu,Xing-Yue Zhou,Jing Zeng,Da-Lian Qin,Geng Xiong,Lu Yu,Wei Ren,An-Guo Wu,Jian-Ming Wu,Xiao-Gang Zhou
Aging is characterized by progressive cellular dysfunction and increased susceptibility to chronic diseases. Enhancing autophagy, a key cellular clearance process, offers a promising strategy to combat aging. In this study, we investigated the autophagy-inducing and anti-aging properties of Salvia plebeia R. Br. ethanol extract (SPE) using in vitro and in vivo models. Our results showed that SPE enhanced autophagosome and autolysosome formation, elevated LC3-II and Beclin-1 levels, and reduced p62 expression in human foreskin fibroblasts (HFFs), confirming its autophagy-inducing activity. SPE also mitigated D-galactose (D-gal)-induced cellular senescence, reducing SA-β-gal staining, senescence markers (p16, p21), SASP factors, and γ-H2AX foci. These effects were Atg7-dependent, as Atg7 knockout abolished the benefits, highlighting autophagy’s role in SPE’s action. In vivo, SPE improved physical function, reversed cellular senescence, enhanced antioxidant defenses, and restored autophagic activity in D-gal-induced prematurely senescent mice. Furthermore, SPE alleviated age-related cognitive decline, reduced neuronal damage, increased synaptic density, and mitigated Tau accumulation. Notably, SPE demonstrated good tolerability over 12 weeks, with stable body weight, no apparent tissue injury, and unchanged serum ALT, AST, and creatinine. Chemical profiling identified rosmarinic acid (RA) as a major bioactive constituent that recapitulated key autophagy- and senescence-related effects in vitro. These findings suggest that SPE is a promising natural autophagy enhancer with potential to promote healthy aging, combat age-related diseases, and serve as a novel therapeutic strategy for cellular dysfunction in aging.
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高影响因子
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