PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 35
·期 1
·1700280
·
IF 4.474
Yin Zhang,Yanfei Zhu,Wencai Zhou,Xueying Qiu,Zhiyong Tang
To find cheap and commercially available materials that are efficient in the catalytic process is of paramount importance for practical application in both chemical and biomedical engineering. As-purchased nanosized semiconductors are systematically investigated as catalysts in visible light driven asymmetric reactions with the help of chiral ligands. Significantly, among varied semiconductors, WO 3 exhibits the best performance with 91% enantiomeric excess and 95% conversion ratio.
研究领域:
化学工程
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生物医学工程
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材料科学
·
催化
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qun Wan,Lu Huang,Long Kong,Qinggang Zhang,Congyang Zhang,Mingming Liu,Xinrong Liao,Wenji Zhan,Weilin Zheng,Changwei Yuan,Mengda He,Liang Li
Artificial intelligence offers new opportunities for translucent displays. However, achieving translucent light-emitting diodes (LEDs) with high efficiency and high color purity remains a challenge. Here, we propose a strategy of using an alkali metal/inert metal (calcium/silver) bilayer metal electrode as a top electrode and perovskite nanocrystals as an emitter layer in the device structure, which allows us to not only fabricate excellent opaque LEDs but also manufacture highly efficient semitransparent LEDs with high color purity, total brightness (over 7000 cd m–2), total external quantum efficiency (over 12%), and 56% transmittance around 520 nm. This is the highest external quantum efficiency report about semitransparent LED based on perovskite materials or inorganic quantum dots so far, which presents great application potential in the field of translucent display with high color purity and wide color gamut.
研究领域:
材料科学
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光电技术
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纳米技术
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显示技术
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NATURE
·
2026
·Vol. 652
·期 8108
·89-95
·
IF 56.1
Han Yu,Yu Jiafeng,Wei Jian,Fang Chuanyan,Han Jianxiang,Sun Yannan,Chen Huaican,Yin Wen,Tan Li,Wang Ning,Ge Qingjie,Sun Jian
Light olefins—ethylene, propylene and butylene (C 2 = –C 4 = )—are essential building blocks in the chemicals industry and are traditionally produced by thermal or catalytic cracking of hydrocarbon feedstocks. Directly converting syngas (CO and H 2 ) into light olefins under mild conditions is attractive but challenging 1 , 2 , 3 , 4 . Prismatic cobalt carbide (Co 2 C) and associated hydrophobic modifications have shown potential for selective light-olefin synthesis under mild conditions 5 , 6 . Here we show another hydrophilic-promotion strategy in which a set of hydroxy promoters, exemplified by hydroxyapatite (Ca 5 (PO 4 ) 3 (OH), HAP), fumed silica (SiO 2 (F)) and amorphous boehmite (AlO(OH), AB), is physically mixed with a Co 2 MnO 4 precursor, inducing synergistic cobalt–manganese (Co–Mn) oxides and Co 2 C for syngas conversion. The induced anorthic Co–Mn oxides may serve as active phase for adsorbed-hydrogen-assisted CO dissociation to CH x /CH x O intermediates, whereas induced Co 2 C or the Co 2 C–oxide interface may mediate C–C coupling of these intermediates to form light olefins. This design achieved 70–82% CO conversion with light-olefins selectivity of more than 60% at 250–260 °C, 0.1 MPa with H 2 /CO ratios of 1–2, giving light-olefins carbon utilization efficiency up to 13%, among the highest reported for syngas to light olefins. This simple hydrophilic strategy for facilitating CO activation may provide useful insights for improving industrial Fischer–Tropsch processes.
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高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2025
·Vol. 122
·期 26
·e2500966122
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IF 9.1
Yifan Li,Huanhong Lu,Degang Guo,Xiaoyan Li,Fei Qi,Jian Zhang,Reinhard Fischer,Qirong Shen,Zhenzhong Yu
Light controls important biological processes in fungi by regulating transcriptional gene activation. Here, we found that beyond the regulation of mRNA transcript abundance, light regulates alternative splicing (AS) in the filamentous fungi Aspergillus nidulans, Trichoderma guizhouense, and Neurospora crassa. Blue light-regulated AS was involved in ergothioneine biosynthesis and conidiation in T. guizhouense, which required the blue light receptor BLR1. Blue light activated the MAPK HOG (Sak) pathway which then transmitted the signal via the serine/threonine kinase SRK1 to the AS key regulator SRP1. SRK1 and SRP1 are important for light-induced conidiation. The light-activated HOG pathway led to an increase of the SRK1 protein level and its phosphorylation status. Phosphorylated SRK1 translocated from the cytoplasm to the nucleus to interact with SRP1, thereby regulating AS efficiency. This study unravels another level of complexity of fungal environmental sensing and responses and also first describes the entire cascade from an environmental signal to the splicing machinery.
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高影响因子
Journal of Materiomics
·
2025
·
IF 9.6
Rundong Tian,Tianliang Zhou,Rong-Jun Xie
Laser-remote activated phosphor (LARP) converted solid state lighting is now developing towards high power density and super-brightness, and phosphor ceramic converters with high efficiency, high thermal conductivity, acceptable transmittance and suitable spectra are thus required. Y 3 Al 5 O 12 :Ce (YAG:Ce)-based ceramics are promising color converters to produce white light with a color temperature of 6000 K for vehicle headlamps, but the brightness and luminous efficiency are not well optimized. In this work, two series of Al 2 O 3 -YAG:Ce and Al 2 O 3 -(Gd,Y)AG:Ce transparent ceramics were fabricated by vacuum sintering, and their microstructure, thermal and optical properties were controlled by changing the Ce 3+ or Al 2 O 3 content as well the thickness of the ceramics. Both Al 2 O 3 -Y 2.925 Al 5 O 12 :Ce 0.0175 (AY0.0175) and Al 2 O 3 -(Gd 0.1 Y 2.89 )Al 5 O 12 :Ce 0.01 (AGY) ceramics containing 70% (in mass) Al 2 O 3 show a luminance saturation threshold of 30.3 W/mm 2 and 38.4 W/mm 2 , enabling to produce white light with a color temperature of 6000 K, luminous flux of 1928 lm and 3101 lm, luminous efficiency of 135.0 lm/W and 161.1 lm/W when pumped by blue laser diodes, respectively. This work provides a solution to finely control the composition, microstructure, and optical properties of transparent ceramics for super-high brightness laser-driven solid-state lighting.
研究领域:
材料科学
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光学工程
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LANGMUIR
·
2025
·
IF 3.9
Yanlin Guo,Chunhua Zhao,Xiaohan Wang,Zhenghe Xu,Dejun Sun
When propylene oxide/ethylene oxide (PO/EO) surfactants were initially placed in the oil phase, long-chain alkanes with poor water solubility were emulsified spontaneously upon contact with the aqueous phase. This formation of oil droplets under static conditions was monitored and the efficiency of spontaneous emulsification was quantified using multiple light scattering (MLS). The effect of the initial surfactant phase on the interfacial tension and moduli was investigated using an interfacial tensiometer. The utilization efficiency of the surfactant and energy under external energy inputs was compared by analyzing the droplet size of the emulsions using microscopic observation and dynamic light scattering. The surfactant with the highest efficiency of spontaneous emulsification could disperse crude oil, which was used to address crude oil spill incidents in cold marine environments. To the best of our knowledge, this is the first study to monitor spontaneous emulsification under static conditions using MLS. This spontaneous emulsification under static conditions depended on the spontaneous diffusion of the PO/EO surfactants from the oil phase into the aqueous phase and on their interactions with the oil molecules. The findings of this study provide insights into the application of MLS to monitoring spontaneous emulsification.
研究领域:
化学工程
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材料科学
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环境科学
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Le Ma,Yang Hou,Jun Nie,Xiaoqun Zhu
The introduction of substituents affects the planarity of the molecule, resulting in different physical and chemical properties. This study synthesized four one-component visible light photoinitiators with different substituents derived from 1-naphthylamine. They were amine-free (BTX), primary amine (BTX-A), secondary amine (BTX-MA), and tertiary amine (BTX-DMA). The photophysical and photochemical properties were explored using UV–visible absorption spectroscopy combined with DFT theory computational simulations. They had excellent absorption properties in the visible light range ( ε : 3200–6300 L mol −1 cm −1 ). The structure of amine substitutions in the initiators showed different redshift phenomena. The maximum absorption wavelength of BTX in the visible region is 388 nm; only a 7 nm red shift occurred for the maximum absorption wavelength of BTX-DMA. While BTX-A had a maximum absorption wavelength of red shifting by 41 nm， the red shift for BTX-MA was about 53 nm, and its UV absorption tail extended to 520 nm. This phenomenon was known to be the result of the combined effect of electronic donor and molecular planarity according to the DFT theoretical calculations. The photopolymerization kinetics of four initiators used for double bond monomers was investigated by real-time FT-IR. The results indicated that polymerization could occur for all the designed systems; the highest double bond conversion could reach 92 % when BTX-DMA was used as a visible-light photoinitiator for the monomer of 2-hydroxyethyl acrylate (HEA).
研究领域:
材料科学
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化学工程
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光学
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 45
·455708
·
IF 3.404
Dingke Xue,Cheng Ruan,Yu Zhang,Haobin Chen,Xiongbin Chen,Changfeng Wu,Chuantao Zheng,Hongda Chen,William W Yu
The bandwidth of white light emitting diodes (WLEDs) is an important factor that affects most of the system performances in visible light communication (VLC). It is mainly limited by the down-conversion phosphors. We propose in this paper to employ nanomaterial phosphors with short fluorescence lifetime and high quantum yield in VLC. The white-emitting device of bandwidth-based lifetime was fabricated by using several kinds of nanophosphors with different fluorescence lifetimes. Moreover, we proposed two theoretical models to analyze the factors that affect bandwidth. Compared with the commercial YAG-based WLEDs, the bandwidth of nanophosphor-based WLEDs can be improved over three times and close to the blue excitation sources. Our study indicates that nanophosphors can become promising fluorescent materials in VLC, and provides a new direction for developing wide-bandwidth VLC systems.
研究领域:
光学
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通信工程
·
材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 27
·53694-53702
·
IF 5.6
Ke Chen,Cheng Zhou,Peixin Gao,Hanzi Jiang,Ming Cheng,Sanlin Liu,Wai-Yeung Wong,Zhi Zhou,Mao Xia
In recent years, Mn 4+ doped oxide phosphors have attracted extensive attention in the field of indoor plant light supplementation due to their red emission. In this study, a rare earth-free red phosphor, Li 3 Mg 2 NbO 6 (LMN):Mn 4+ , was prepared by high-temperature solid-state reaction. The resultant phosphor exhibited red emission within the 600–800 nm band, with a peak at 668 nm, when excited by 351 nm and 468 nm. DFT calculations of charge density and formation energies determined that Mn 4+ tends to occupy the Mg 2+ sites, leading to a charge imbalance that affects the luminescence intensity of the material. In light of the foregoing, charge compensation strategy was adopted in order to achieve charge balance through excessive doping of Li + , Na + and K + alkali metal ions. The optimal doping concentrations of Li + , Na + and K + were determined to be 0.35, 0.4 and 0.3, respectively. The luminescence intensity of LMN:Mn 4+ phosphors was found to increase to 453%, 500% and 708% of the initial intensity. Concurrently, the quantum efficiency (QE) of the phosphor LMN:Mn 4+ was enhanced from 33.8 % to 48.1%, 57.04% and 69.19%, respectively, by means of additional doping with Li + , Na + and K + . At 100 °C, the emission intensity of the LMN:0.01Mn 4+ phosphor was found to be 73.6% of that at room temperature (25 °C). The thermal stability of additional Li + , Na + and K + by charge-compensated doping is slightly reduced. Finally, LMN:0.01Mn 4+ , 0.3K 2 CO 3 phosphor and a blue light chip were used to prepare the phosphor conversion light-emitting diodes (pc-LEDs). The electroluminescence spectra of the pc-LEDs exhibited a blue and red double emission, corresponding to the absorption bands of chlorophyll B and photochrome P R . This finding indicates that pc-LEDs have considerable potential for application in the field of plant growth LED lamps.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Na Wang,Qianrui Li,Jinping Yuan,Di Zhao,Hongjian Yang,Yige Wang
Ag + -exchanged SSZ-13 zeolites with single-phase white-emitting, especially obtained in a mild temperature (400 °C), are highly desirable for the construction of white LEDs, but rarely reported. Herein, luminescent silver nanoclusters composites were synthesized though treating H-SSZ-13 zeolites in the presence of a moderate amount of sodium hydroxide solutions, by assembling the silver nanoclusters in the modified SSZ-13 zeolites, followed by heating under mild conditions, which it bright white light emission phenomena under a 365 nm UV light. This white emitting may be ascribed to the collapse of the zeolite skeleton due to the etching of the zeolites by NaOH, thereby formation and stabilization of silver nanoclusters within modified Na-SSZ-13 zeolites. For the first time, the white-emitting Ag@Na-SSZ-13-400 zeolites phosphors were obtained at a mild temperature (400 °C) with a photoluminescence quantum yield (PLQY) of 24.45 % and the CIE chromaticity coordinate were (0.26, 0.33) under the 360 nm excitation. We believe that this work may provide a prospect for application of SSZ-13 zeolites and the preparation of luminescent AgNCs.
研究领域:
材料科学
·
光学
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高影响因子
Nature Photonics
·
2025
·
IF 32.9
Jin Wangxiao,He Siyu,Lu Xiuyuan,Zhu Xitong,Liu Dijiong,Sun Guolong,Hao Yanlei,Chen Zuyan,Wang Chenyang,Zeng Jiejun,Zheng Zhi,Yan Xiaolin,Yan Yiran,Wu Longjia,Lin Xiongfeng,Hou Wenjun,Cao Weiran,Liu Chuan,Liang Xiaoci,Gao Yuan,Deng Yunzhou,Cao Kaisheng,Yang Yingguo,Gao Feng,Jin Yizheng
Solution-processed light-emitting diodes (LEDs) are appealing for their potential in the low-cost fabrication of large-area devices. However, the limited performance of solution-processed blue LEDs, particularly their short operation lifetime, is hindering their practical use in display technologies. Here we demonstrate that trace water in the device—previously considered detrimental to most solution-processed LEDs—dramatically enhances the performance of quantum-dot LEDs. This breakthrough stems from our comprehensive mechanism investigations into the positive aging phenomenon, a long-standing puzzle in the quantum-dot LED field. Our findings reveal that water passivation on the surface of electron-transporting layers, which are composed of zinc-oxide-based nanoparticles, improves charge transport and enhances exciton radiative recombination by suppressing hole leakage during device operation. Combined with the advanced top-emitting architecture, our blue quantum-dot LEDs achieve a high current efficiency of 37.1 cd A −1 , a blue index (colour-coordinate-corrected current efficiency) of over 490 cd A −1 \({{\rm{CIE}}}_{y}^{-1}\) and unprecedented stability, with an extrapolated T 95 lifetime (at an initial brightness of 1,000 cd m −2 ) of 287 h. Our work may inspire further exploration into surface passivation of nanocrystalline functional layers, critical for the advancement of emerging solution-processed optoelectronic and electronic devices.
研究领域:
光电子学
·
纳米技术
·
材料科学
·
半导体器件
·
显示技术
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Nature Photonics
·
2018
·Vol. 12
·期 12
·783-789
·
IF 32.521
Zhao Baodan,Bai Sai,Kim Vincent,Lamboll Robin,Shivanna Ravichandran,Auras Florian,Richter Johannes M.,Yang Le,Dai Linjie,Alsari Mejd,She Xiao-Jian,Liang Lusheng,Zhang Jiangbin,Lilliu Samuele,Gao Peng,Snaith Henry J.,Wang Jianpu,Greenham Neil C.,Friend Richard H.,Di Dawei
Perovskite-based optoelectronic devices are gaining much attention owing to their remarkable performance and low processing cost, particularly for solar cells. However, for perovskite light-emitting diodes, non-radiative charge recombination has limited the electroluminescence efficiency. Here we demonstrate perovskite–polymer bulk heterostructure light-emitting diodes exhibiting external quantum efficiencies of up to 20.1% (at current densities of 0.1–1 mA cm −2 ). The light-emitting diode emissive layer comprises quasi-two-dimensional and three-dimensional (2D/3D) perovskites and an insulating polymer. Photogenerated excitations migrate from quasi-2D to lower-energy sites within 1 ps, followed by radiative bimolecular recombination in the 3D regions. From near-unity external photoluminescence quantum efficiencies and transient kinetics of the emissive layer with and without charge-transport contacts, we find non-radiative recombination pathways to be effectively eliminated, consistent with optical models giving near 100% internal quantum efficiencies. Although the device brightness and stability (T 50 = 46 h in air at peak external quantum efficiency) require further improvement, our results indicate the significant potential of perovskite-based photon sources.
研究领域:
材料科学
·
光电子学
·
光子学
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高影响因子
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