CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yueyue Shen,Huilin Tang,Feng Liu,Kebin Lin,Jianxun Lu,Chuanzhong Yan,Wenjing Feng,Kaikai Liu,Liqin Wu,Mingjie Li,Zhanhua Wei,Keyou Yan
As an indispensable part of the visible light region, cyan emission (470 nm–500 nm) is of great importance in lighting, displays, and light communication. Metal halide perovskite materials have made significant progress in the field of luminescent materials and devices. However, the corresponding cyan emission through halide mixing is non-stable due to halogen migration and phase separation. Herein, we developed a steric stabilization approach to tune and stabilize the cyan emission of methylammonium (MA)-based perovskites. Dimethylammonium (DMA + ) lead bromide, with the small DMA + branched cation, was used as intermediate to react with MABr, forming blue-to-green emissive (MA) x (DMA)PbBr 3 +x compounds simular to the low-dimensional perovskites. Furthermore, protonated (trimethylsilyl)methylamine (TmMA), the larger branched cation, was adopted as an interlayer space to further reduce the perovskite dimension, tuning the emission to the cyan region. The combination of the two branched cations enabled us to achieve a champion photoluminescence quantum yield (PLQY) of ~87.8% (peak wavelength ~486 nm). Moreover, the as-synthesized double cations modified perovskites in combination with LED InGaN chip can be used to fabricate stable cyan emission LEDs with improved durability (over 1000 min) and white LEDs with increased color rendering index (from ~73.1 to ~81.7).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kun Zheng,Xu Li,Mingjun Chen,Yi Gong,Aiwei Tang,Zhenguang Wang,Zhiren Wei,Li Guan,Feng Teng
According to mastery of solvent and reaction temperature, red, yellow, and blue emissive carbon nanodots (CNDs) with high quantum yield are successfully achieved using neutral red carbon source by solvothermal methods. The differences on the emission color of CNDs are evidently ascribed to conjugated absorption bands from n-π* transition confirmed by structural and optical characterizations. The results of quantum yield, transmission electron microscopy images, high magnification fluorescent micrographs of CNDs ethanol solution and solid-state CNDs & polyvinylpyrrolidone (CNDs&PVP) powders reveal that the obtained CNDs possess ultrahigh luminescence, favorable solubility, uniform dispersibility and well material compatibility. The bright fluorescent films were fabricated by mixing the CNDs &PVP composite powders with the epoxy. By taking advantage of these remarkable properties, the red, yellow, blue light-emitting diode was realized by combining CNDs&PVP film with a UV-LED chip. This work provides a new perspective for the explanation of the PL mechanism and the exploration of stable, high-performance, and environment-friendly multicolored CNDs-based LEDs.
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高影响因子
COLORATION TECHNOLOGY
·
2021
·Vol. 137
·期 4
·348-360
·
IF 1.614
Chenglong Wang,Kai Yan,Xun Luo,Shulan Jin,Lili Wang,Jun Luo,Jinhuan Zheng
Polyurethane acrylate-based titanium dioxide was used to prepare blue light-curable inks as both a white pigment to replace the original white pigment and as an oligomer. The polyurethane acrylate-based titanium dioxide was fabricated using a two-step method. In the first step, the titanium dioxide was grafted with γ-aminopropyltriethoxy silane, and the grafting process was studied. Second, amino-modified titanium dioxide was used to prepare polyurethane acrylate-based titanium dioxide, which was then used to configure the blue light-curable polyurethane acrylate-based titanium dioxide ink. Fourier Transform–infrared spectroscopy indicated that the amino-modified titanium dioxide and polyurethane acrylate-based titanium dioxide were prepared successfully. The content of the amino groups on the surface of the amino-modified titanium dioxide could be effectively controlled by adjusting the pH value. Moreover, by increasing the content of the amino groups, the viscosity decreased and the photopolymerisation efficiency increased, which was attributed to the formation of branched structures and the promoting effect of the amino groups on the titanium dioxide. The inks with decreased viscosity and branched structures displayed excellent cross-linking properties: viscoelastic transition was achieved within 10 seconds and the final moduli were in the range of 36-55 kPa. The cross-linking degree and rate were more than seven times those of unmodified ink. The ranges of elongation and stress were 95%-165% and 1.9-4.3 MPa, respectively, and the amino group content varied from 0% to 0.101%. In general, polyurethane acrylate-based titanium dioxide was shown to be suitable for blue light-curable ink.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Min Li,Xian Wei,Shiliang Mei,Zhongjie Cui,Yizhou Fan,Bobo Yang,Zhuoqi Wen,Zhiyong Xiong,Le Wang,Fengxian Xie,Wanlu Zhang,Ruiqian Guo
Single-phased and white-emissive quantum dots (QDs) with a broadband spectrum are highly desirable as color converter for white light-emitting diodes (WLEDs) and have been less researched up till now. In this work, a series of copper gallium selenium based multicomponent QDs including quaternary Cu-Zn-Ga-Se (CZGSe) and quinary Cu-Mn-Zn-Ga-Se (CMZGSe) QDs were synthesized. From the perspective of thermodynamics and kinetics, the comparison between PL spectra under increasing temperatures via one-pot and hot-injection methods indicated that the formation of CZGSe cores originated from the diffusion of Cu + into Zn-Ga-Se nanoparticles . For wider spectra distribution, the incorporation of Mn 2+ gave rise to Mn d-d emission around 590 nm. Together with Cu-related emission about 500 nm and intrinsic emission around 430 nm, white emission of CMZGSe QDs could be realized well-tuned by incremental ZnSe deposition, whose chromaticity coordinates shifted along with the Planckian locus. These results about multicomponent alloyed QDs enrich mechanistic insight for the formation kinetics and reveal the potential to fabricate better color rendering WLEDs .
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ting Chen,Dongyu Wang,Xianfu Chen,Minghui Qiu,Yiqun Fan
In this study, a novel method was proposed for preparing high-flux ceramic membranes via digital light processing (DLP) three-dimensional (3D) printing technology. Two different alumina powders were well dispersed in a photosensitive resin to form a UV-curable slurry for DLP 3D printing. The effects of the grading ratio on the viscosity of the slurry and the porosity, pore size distribution , mechanical strength , roughness, and permeability of the ceramic membranes were systematically investigated. The thermal treatment conditions were also studied and optimized. The obtained ceramic membranes exhibited a uniform pore size distribution, a high porosity, a low tortuosity factor, and an asymmetric structure. The combination of these factors led to a high flux for the 3D-printed ceramic membranes. DLP 3D printing exhibited a good potential to be a strong candidate for the next generation of ceramic membrane fabrication technology.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Zhihai Cao,Shudi Zhu,Hui Qu,Dongming Qi,Ulrich Ziener,Liu Yang,Yingjie Yan,Haitang Yang
Ag/TiO 2 nanocomposites were prepared through combination of a sol–gel process of a titanium precursor in inverse miniemulsions and in situ reduction of silver ions in the “nanoreactors”. The morphological investigation shows that Ag nanoparticles are mainly located on the surface of TiO 2 nano-supports because of the fast reduction rate of Ag ions by hydrazine. Ag/TiO 2 nanocomposites with amorphous or anatase TiO 2 phase displayed high visible-light catalytic activity for degradation of Rhodamine B. The photoactivity of Ag/anatase TiO 2 nanocomposites could be influenced by the Ag content that could be conveniently tuned by the loading of silver salts. The influence of the loading of silver salts on the particle properties of the Ag/TiO 2 nanocomposites was investigated systematically.
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高影响因子
AIP Advances
·
2023
·Vol. 13
·期 6
·
IF 1.6
Tu Peng,Cai Xiangcheng,Ai Yansong,He Hongshen,Shen Peng,Zhou Yuanming,Mei Fei
Perovskite light-emitting diodes (PeLEDs) have attracted much attention due to their excellent performance. In this work, phenylethylamine bromide (PEABr) was employed to modify perovskite phases, while Poly(9-vinylcarbazole) (PVK) was added as a hole transport layer between perovskite and PEDOT:PSS to engineer the device structure, which is predicted to improve the optoelectronic performance of PeLEDs synergistically. The doping of PEABr in MAPbBr 3 can improve the radiative recombination of the emission layer through the formation of two-dimensional perovskite phases and modified film morphology. When the ratio of MAPbBr 3 :PEABr is 1:0.25, the maximum luminance of the optimal device increased from 80 to 9000 cd/m 2 and the maximum external quantum efficiency increased from 0.02% to 1.63% compared with the control device without PEABr doping. In addition, the hole injection ability of the device is further improved by adding PVK as the hole transport layer. The introduction of PVK can also facilitate the interface modification via surface defect passivation. When the PVK concentration is 10 mg/ml, the maximum current efficiency and external quantum efficiency of the optimal device are increased to 13.70 cd/A and 2.70%, respectively. These findings can provide a basis for the enhanced performance of PeLEDs.
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Small
·
2022
·Vol. 18
·期 26
·2200857
·
IF 15.153
Hao Cheng,Jiameng Wang,Yongqiang Yang,Huixian Shi,Jing Shi,Xiong Jiao,Peide Han,Xiaohong Yao,Weiyi Chen,Xiaochun Wei,Paul K Chu,Xiangyu Zhang
Light-assisted antibacterial therapy is a promising alternative to antibiotic therapy due to the high antibacterial efficacy without bacterial resistance. Recent research has mainly focused on the use of near-infrared light irradiation to kill bacteria by taking advantage of the synergistic effects rendered by hyperthermia and radical oxygen species. However, photocatalytic antibacterial therapy excited by visible light is more convenient and practical, especially for wounds. Herein, a visible light responsive organic-inorganic hybrid of ZnTCPP/Ti 3 C 2 T X is designed and fabricated to treat bacterial infection with antibacterial efficiency of 99.86% and 99.92% within 10 min against Staphylococcus aureus and Escherichia coli , respectively. The porphyrin-metal complex, ZnTCPP, is assembled on the surface of Ti 3 C 2 T X MXene to capture bacteria electrostatically and the Schottky junction formed between Ti 3 C 2 T X and ZnTCPP promotes visible light utilization, accelerates charge separation, and enhances the mobility of photogenerated charges, and finally increases the photocatalytic activity. As a result of the excellent bacteria capturing ability and photocatalytic antibacterial effects, ZnTCPP/Ti 3 C 2 T X exposed to visible light has excellent antibacterial properties in vitro and in vivo. Therefore, organic-inorganic materials that have been demonstrated to possess good biocompatibility and enhance wound healing have large potential in bio-photocatalysis, antibacterial therapy, as well as antibiotics-free treatment of wounds.
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高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 8
·2501-2509
·
IF 4.4
Liu Wen-bo,Du Xue-rong,Wang Cheng-cheng,Zhuo Chun-xue,Chang Jin,Wang Na-na,Li Ren-zhi
Cesium copper halides have attracted increasing attention for light-emitting diodes (LEDs) applications due to their high photoluminescence quantum efficiency (PLQE) and non-toxicity. However, the current film fabrication methods for copper halides cannot simultaneously meet the high-performance, eco-friendly, and good environmental tolerance requirements. Here, we demonstrate a facile approach that combines the advantages of both traditional nanocrystal-based methods and precursor solution-based methods. Through treating Cs 3 Cu 2 I 5 nanocrystal films with proper alcohols, Cs 3 Cu 2 I 5 /CsCu 2 I 3 mixed-dimensional copper halides are formed with enhanced PLQE and improved energy level matching. This enhances the peak EQE of copper halide LEDs to 0.8%, which is among the highest efficiency of lead-free metal halide nanocrystal LEDs. This work provides a new strategy for fabricating high-performance lead-free LEDs in an eco-friendly manner.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Wen li Zhao,Yan hua Gao,Dongfeng Zhang
In this paper, spherical g-C 3 N 4 modified by N defect and O doping was prepared by a simple hydrothermal method , and combined with CdS to form a direct Z-type heterojunction . Combined with a series of characterizations (XRD, SEM, BET, FTIR and UV–vis DRS), the results show that the addition of CTAB brings a lot of positive charges on the surface of N-OCN. According to the principle of electrostatic attraction, positively charged N-OCN negatively charged CdS attract each other, which strengthens the close contact between CdS and N-OCN and plays an important role in stabilizing the formation of heterojunction. CdS is anchored to N-OCN through electrostatic interaction. Under the irradiation of visible light, the electrons on CB on positively charged N-OCN combine with holes on negatively charged CdS valence band, which improves the redox ability in photocatalytic reaction system. Taking methyl orange (MO) as a pollutant degradation model, the possible degradation mechanism was discussed in detail. This study provides a simple, effective and wide application method for the modification of g-C 3 N 4 .
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高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jiahao Lu,Yanan Jiang,Tianyi Xiong,Ping Yu,Wei Jiang,Lanqun Mao
Nanofluidic ionic diodes have attracted much attention, because of the unique property of asymmetric ion transport and promising applications in molecular sensing and biosensing. However, it remains a challenge to fabricate diode-like nanofluidic system with molecular-size pores. Herein, we report a new and facile approach to construct nanofluidic ionic diode by in situ asymmetric growth of metal–organic frameworks (MOFs) in nanochannels. We implement microwave-assisted strategy to obtain asymmetric distribution of MOFs in porous anodic aluminum oxide with barrier layer on one side. After etching the barrier layer and modifying with positively charged molecules, the nanofluidic device possesses asymmetric geometry and surface charge, performing the ionic current rectification (ICR) behavior in different electrolyte concentrations. Moreover, the ICR ratio is readily regulated with visible light illumination mainly due to the enhancement of surface charge of MOFs, which is further confirmed by finite element simulation. This study provides a reliable way to build the nanofluidic platform for investigating the asymmetric ion transport through the molecular-size pores, which is envisaged to be important for molecular sensing based on ICR with molecular-size pores.
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高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2019
·Vol. 40
·期 22
·1900441
·
IF 4.078
Hanzhi Zhang,Tongtong Zhou,Jiwei Shen,Ping Zhang,Xin Chen,Yongming Chen,You Yu
Finely tuning the photodegradation behavior of the layer-by-layer (LbL) film from the view of controlling the chemical structure of the film-building polymer is still a challenge in related fields. To meet this requirement, a photodegradable polymer (P1) is rationally designed for assembling a visible-light-degradable multilayer film with polystyrene sulfonate (PSS). Compared with similar photopolymers (P2 and P3), this asymmetric picolinium-containing polymer can significantly enhance the degradation rate of as-prepared LbL films; under the same degradation condition, the degradation rate of (P1/PSS)10 is 3 and 6.6 times that of (P2/PSS)10 and (P3/PSS)10, respectively. Moreover, near-infrared light (NIR) is available for triggering the degradation of this film with the assistance of upconversion nanoparticles of YbTm@Lu. The cell cytotoxicity and cell proliferation experiments reveal that P1 is nontoxic and favorable for cell proliferation at concentrations of up to 500 μg mL −1 . As for (PSS/P1)10 films, the ratio of cell number of these two samples ((PSS/P1)10 modified: photodegraded) increases dramatically and reaches about 1.67:1 after 72 h incubation. On the basis of these results, it is anticipated that P1 and this LbL film is an exceptional candidate for visible-light/NIR degradable materials in materials and biological science, medicine, and optics.
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