INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Konglan Chen,Shiyu Jia,Xueliang Zhang,Zifan Shao,Yayun Zhou,Ting Fan,Ting Yu,Tingting Deng
Development of highly thermally stable broadband near-infrared (NIR) luminescence materials is crucial for advancing the prolonged stable application of smart NIR light sources. In this study, a zero-thermal-quenching and reversible temperature-dependent broadband NIR-emitting Cs2NaAl3F12:Cr3+ phosphor is demonstrated, benefiting from its stable polyhedron-cluster-building rigid structure. The excellent thermal stability of Cs2NaAl3F12:Cr3+ is rooted in its stable [Al6Na4F45] cluster building unit, which provides a rigid structure with a weak electron–phonon coupling effect and a wide band gap with a huge thermal activated barrier. Such characteristics are well revealed by multiple studies on crystal structure, electronic structure, Huang–Rhys factor S, configuration coordinate model, and Debye temperature. The incorporation of Li or K instead of Na weakens the luminescence thermal stability, directly proving the importance of the stable [Al6Na4F45] cluster for stable Cr3+ substitution and rigid structure construction. Furthermore, Cs2NaAl3F12:Cr3+ presents much superior thermal stability compared to traditional rigid garnet-type fluorides Na3X2Li3F12:Cr3+ (X = Al, Ga, In). A high-power NIR LED is presented, utilizing the high quantum efficiency (∼71%) and extremely thermally stable broadband NIR emission around 750 nm of Cs2NaAl3F12:Cr3+. It realizes clear vein and cartilage imaging in the human hand, demonstrating its potential in medical diagnosis applications. This result provides important insights for designing new-type rigid crystal structures using stable polyhedron clusters as basic units, advancing the development of highly thermally stable NIR-emitting phosphors.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 10
·1571-1581
·
IF 7.571
Shaomin Wu,Xiangyu Liu,Zhao Li,Zhong Lu,Nan Jiang,Hao Yang,Huaiying Yao
The ever-growing antibiotic-resistant bacteria pose a huge threat to public health. Restoring the susceptibility of ineffective antibiotics by inorganic nanomaterials and combining the photothermal and antibiotic effects could be an optional strategy to combat this resistance. Here, cefotaxime (CTX) loaded tellurium nanoparticles (Te NPs) were fabricated to recover the antibacterial activity of the ineffective β-lactam antibiotic CTX against methicillin-resistant Staphylococcus aureus (MRSA) and at the same time perform photothermal therapy under light-emitting diode (LED) irradiation with a wavelength in the range of 420–480 nm. The combination of 50 μg mL−1 Te–CTX NPs with 5 min LED irradiation produced a 30.4 °C temperature increase and killed 99% of MRSA in vitro. In vivo evaluation in mice revealed that Te–CTX NPs and LED irradiation accelerated the healing of MRSA infected wounds and presented biosafety. Furthermore, this combination accelerated glutathione oxidation and resulted in the disruption of the antioxidant defence system of MRSA. Such a synergistic antibiotic and photothermal therapy provides an innovative way for the treatment of antibiotic-resistant bacterial infections.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Li Lin,De Yu,Lin Xu,Yi Huang,Manhong Huang,Hossein Kazemian
An advanced oxidation process was developed under LED blue light (BL) photocatalysis in the presence of ammonium persulfate (APS) for effective degradation of tetracycline (TC) from contaminated water . Waste rock wool (RW) fibers modified with BiOBr nano-sheet (BiOBr/RW) using impregnation combined with hydrolysis process, was employed to activate APS to produce reactive radicals under LED BL irradiation (BiOBr/RW+APS+BL system). The influence factors on TC degradation were investigated. Besides, the radical scavengers such as methanol (MA), phenol (PN), tertbutanoland (TBA) and ethylene diamine tetraacetate (EDTA-2Na) combined electron spin paramagnetic resonance (EPR) analysis were used to confirm the reactive radical species. The developed BiOBr/RW+APS+BL system exhibited much higher TC removal efficiency compared with other reported oxidation systems. In addition, the BiOBr/RW could directly activate the APS leading to degrade TC in the darkness. A maximum TC removal of 84.3% was achieved under the optimal conditions such as initial concentration of APS 100 mg/L, BiOBr/RW dosage 0.1 g/L and pH 7 in 80 min. Results also ascertained that h + , •OH and •SO 4 - over surface of the BiOBr/RW were the primary active chemical species in the BiOBr/RW+APS+BL system. It was found that the •OH and •SO 4 - in solution play critical roles for degradation of TC on the BiOBr/RW+APS system in dark. Finally, the repeated experiments indicated the excellent stability, photocatalytic ability and cycling property of BiOBr/RW.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianmei Pan,Yahai Zhang,Yi Guan,Yingnan Yan,Hua Tang,Xianglong Liu,Mengdi Wang,Xiangxin Wei
The development of hydrogen (H 2 ) production photocatalyst with low cost, non-precious metal and high-activity for commercial application is a long-term target and challenge. In this work, novel silicon carbide (SiC) nanofibers/graphitic carbon nitride (g-C 3 N 4 ) nanosheets (SiC/CNNS) decorated via multipurpose nickel (Ni) nanoparticles were prepared by an easy heat treatment followed by hydrothermal method. The tight Ni interface layers as cocatalyst and electron transfer mediator can significantly enhance the H 2 production property over SiC/CNNS nanoheterojunctions under light-emitting diode (LED) illumination. The optimal Ni/SiC/CNNS with a mass fraction of 10% Ni loading shows the most superior H 2 -generation rate of 6183 μmol g −1 h −1 , which is approximately 53, 3 and 227 times compared to CNNS, 10 %Ni/CNNS and SiC/CNNS, respectively. The metallic Ni nanoparticles play the leading and multifunctional roles in improving photocatalytic activity, including collecting the photo-generated electrons efficiently, transferring and separating the charge carriers rapidly, facilitating the H 2 -production kinetics and decreasing the overpotentials of surface reactions for H 2 -production. It is highly expected that the multipurpose and non-precious metal cocatalyst to form tight interface layers can supply a simple and universal strategy to design high-efficiency cocatalyst-semiconductor–semiconductor photocatalysts for H 2 production.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3592-3602
·
IF 3.186
Chi Xianhu,Tan Siyu,Song Jun,Liu Fengjiao,Tian Yaxi,Yuan Haibin,Guan Rongfeng
g-C 3 N 4 has received much attention due to its role in photocatalytic hydrogen evolution and contaminants degradation. Nevertheless, the photocatalytic property of bulk g-C 3 N 4 (BCN) is seriously restricted owing to its short photo-generated carrier lifetime, small specific surface area and low visible light utilization rate, etc. In this study, nanosheet constructing and heteroatom phosphorus (P) doping, as two important strategies, are synergistically adopted to co-enhance its activity. The controllable P atoms were successfully doped into the framework of g-C 3 N 4 nanosheet (NCN-P) through forming P-N bond. The optimized NCN-P sample displays an excellent H 2 production rate (3263.99 µmol·g −1 ·h −1 ) under white LED light irradiation, which is more than 11.6 times that of the BCN. Moreover, it also exhibits excellent photocatalytic degradation ratio of tetracycline reached 80% in 1 h. Furthermore, the optimized NCN-P sample still maintains robust photocatalytic performance after recycling tests, making it as a bright prospect photocatalyst for solar energy utilization and contaminants removal. Graphic Abstract
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wasim Ullah Khan,Lei Zhou,Xiaohui Li,Weijie Zhou,Dilfaraz Khan,Shah-Iram Niaz,Mingmei Wu
The white light-emitting diodes, contributing as a light initiator for the succeeding generation, is now becoming a consistently developing and attractive research area. However, the weak thermal stability, high correlated color temperature (CCT), and low color rendering (Ra) restrict its effectiveness for large-scale implementation. In this work, we reported for the first time the incorporation of rare-earth ions Ce 3+ -Tb 3+ -Sm 3+ into Ca 3 YAl 3 B 4 O 15 (CYAB) in the fabrication of WLEDs, which showed tunable photoluminescence properties to accomplish exceptional thermal stability, single-phase white light emission, and efficient energy transfer among Ce 3+ , Tb 3+ , Sm 3+ ions, respectively. The crystal structure and the rare earth ion dopants in the cation borate CYAB phosphors were quantitatively evaluated, that highlighting the preferences at 9-fold-coordinated Y sites. The sensitization effects were studied by evaluating the photoluminescence, lifetime curves, and quantum efficiencies, respectively. Besides this, the CY 0.45 AB:0.50Tb 3+ ,0.05Sm 3+ and CY 0.65 AB:0.03Ce 3+ ,0.20Tb 3+ ,0.12Sm 3+ phosphors possess significant resistance towards thermal quenching phenomena. The white LED either containing CY 0.45 AB:0.50Tb 3+ ,0.05Sm 3+ phosphor blended with the commercial blue phosphor or the single-phase WLED only containing CY 0.65 AB:0.03Ce 3+ ,0.20Tb 3+ ,0.12Sm 3+ phosphor exhibited warm white emissions either with low CCT ≈ 4543 K or 3913 K and high Ra with 86.0 or 84.4, respectively. These results are superior to the commercial WLED containing Y 3 Al 5 O 12 :Ce 3+ phosphor and blue LED chip (CCT ≈ 7746 K, Ra ≈ 75), that furnish either as a good candidate for the fabrication of warm WLED.
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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
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纳米技术
·
材料科学
·
半导体器件
·
显示技术
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DOI
高影响因子
Remote Sensing
·
2021
·Vol. 13
·期 16
·3311
·
IF 4.848
Alejandro Sánchez de Miguel,Jonathan Bennie,Emma Rosenfeld,Simon Dzurjak,Kevin J. Gaston
The global spread of artificial light is eroding the natural night-time environment. The estimation of the pattern and rate of growth of light pollution on multi-decadal scales has nonetheless proven challenging. Here we show that the power of global satellite observable light emissions increased from 1992 to 2017 by at least 49%. We estimate the hidden impact of the transition to solid-state light-emitting diode (LED) technology, which increases emissions at visible wavelengths undetectable to existing satellite sensors, suggesting that the true increase in radiance in the visible spectrum may be as high as globally 270% and 400% on specific regions. These dynamics vary by region, but there is limited evidence that advances in lighting technology have led to decreased emissions.Keywords:ALAN;artificial light at night;astronomy;DMSP;LEDs;light pollution;melatonin;nocturnal ecology;VIIRS
研究领域:
环境科学
·
生物学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yuanjing Wang,Yayun Zhou,Enhai Song
Mn 4+ -activated fluoride red phosphors have a bright prospect for improving the warm white light-emitting diodes (W-LEDs) performances, whereas there remains some challenges in synthesis, such as reducing the consumption of toxic HF and improving Mn 4+ doping efficiency. Herein, a new phosphor (NH 4 ) 2 NaScF 6 :Mn 4+ (NNSFM) was synthesized by an ammonium salt conversion method, which can effectively reduce HF consuming, enhance reaction rate and doping efficiency. The synthesis mechanism, luminescence properties and W-LEDs performances of the as-synthesized NNSFM have been investigated. Moreover, the lattice structure and doping position have been investigated in detail by the density functional calculations (DFT), which show that Mn 4+ could occupy the Sc 3+ crystallographic site in this structure and simultaneously produce a Na vacancy ( V Na ' ) for charge compensation. Using the NNSFM as red-light component, a warm W-LED device with a high color rendering index (CRI, Ra = 80.6) and low correlated color temperature (CCT = 3006 K) has been achieved. This work presents a new Mn 4+ doped fluoride red phosphor and also develops an environmentally friendly strategy for synthesizing Mn 4+ doped fluoride phosphors.
研究领域:
材料科学
·
光学工程
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yuan Zhong,Shujie Gai,Yimei Yang,Mao Xia,Ye Zhang,Fanshan Qiu,Fang Xiang,Zhi Zhou
Green phosphor is an essential component in phosphor-converted white light-emitting diodes (pc-LEDs). Herein, a novel green-emitting phosphate phosphor Sr 8 ZnY(PO 4 ) 7 :Eu 2+ (SZYP:Eu 2+ ) was synthesized through hydrothermal reaction method. The crystal structure, photoluminescence properties as well as thermal stability of SZYP:Eu 2+ were investigated systematically. SZYP:Eu 2+ can be efficiently excited by n-UV light in the range from 220 to 550 nm and shows a broad emission band centered at 520 nm with a full width at half maximum of 86 nm. The optimized doping concentration of Eu 2+ was determined to be 0.02 mol. With the increase of Eu 2+ content, a subtle red shift about 4 nm in emission spectra was detected. SZYP:Eu 2+ also shows comparable thermal stability (45% at 150 °C) and it can be further varied to 44, 40 and 51% by co-doping with Pr 3+ , Tm 3+ and Yb 3+ , respectively. The white LED device blended with SZYP:Eu 2+ shows excellent electroluminescence (EL) properties. The low correlated color temperature (4791 K) and ultrahigh color rendering index (95.8) imply that this phosphor may find a potential application in high-quality white LEDs.
研究领域:
材料科学
·
光学工程
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 33
·期 5
·055602
·
IF 3.874
Xinsu Zhang,Hao Lv,Weishuo Xing,Yanjun Li,Chong Geng,Shu Xu
Significant advance was realized on the economic synthesis of InP quantum dots (QDs) by using aminophosphines as phosphorus precursor. However, the low reaction activity and thermal degradation of aminophosphines bring severe difficulty for growth control of InP QDs. Here, we employed trioctylphosphine (TOP) as a surfactant to accelerate the growth of the InP QDs. The reaction mechanism study reveals that the TOP could form a reactive complex with indium halides that effectively accelerates the formation of InP monomer and reduces the demand for reaction temperature. On this basis, the effect of reaction temperature, precursors, and zinc halide additives on the growth of the TOP-InP QDs was explored. This strategy alleviates the difficulty in growth control of InP QDs and also benefits to the synthesis of luminescent InP/ZnS core–shell QDs within visible regime. A white-light emitting diode device was fabricated with the InP/ZnS QDs that demonstrates their application potential in light-emitting devices.
研究领域:
材料科学
·
化学工程
·
纳米技术
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 9
·12616-12630
·
IF 2.478
Wang Shengjia,Xu Chenchen,Qiao Xuebin
Dy 3+ , Sm 3+ co-doped Y 2 SiWO 8 (YSiWO) phosphors were synthesized through the sol–gel method. The crystal structure, morphology, photoluminescence spectra and thermal stability of the phosphors have been thoroughly studied. The Dy 3+ dopant concentration is fixed at 2 mol% in co-doped samples. It is noticeable that energy transfer from Dy 3+ to Sm 3+ is apparent under the 365 nm excitation. The energy transfer mechanisms of Dy 3+ → Dy 3+ (YSiWO: Dy 3+ ), Sm 3+ → Sm 3+ (YSiWO: Sm 3+ ) and Dy 3+ → Sm 3+ (YSiWO: Dy 3+ , Sm 3+ ) are extensively studied, respectively. Upon the 365 nm excitation, the co-doped phosphor shows the color-tunable emission varying from blue-green to white via adjusting Sm 3+ concentration. The YSiWO: 0.02Dy 3+ , 0.06Sm 3+ phosphor exhibits an ideal warm white emission with CIE coordinates of (0.362, 0.323) and CCT of 4129 K. This phosphor is also found to possess the remarkable thermal stability. In summary, the YSiWO: Dy 3+ , Sm 3+ white-emitting phosphor may have potential use in w-LEDs.
研究领域:
材料科学
·
光学
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高影响因子
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