SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Yingwei Gao,Shuo Zhang,Bo Ge,Hui Zhao,Chuanyu Jin,Hui Yan,Limin Zhao
The high thermal stability and chemical durability of amide-linked covalent organic frameworks (amide COFs) make them a promising material for a range of new applications. Nevertheless, the low reversibility of the amide bond presents a significant challenge to the direct synthesis of amide-bonded COFs. In this paper, we present a simple method for synthesizing amide COFs. The synthesis of imine-linked COFs was initially achieved through the reaction of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2,5-dimethoxybenzene-1,4-dicarboxaldehyde. Subsequently, amide COFs were synthesized via the oxidation of the imine bond into an amide bond, utilizing ammonium persulfate as the oxidizing agent. Due to the difference of link bond, two COFs separately displayed distinct and significant fluorescence enhancement for Al 3+ and Ce 3+ , which was highly sensitive and less affected by environmental factors. The strategy offers a novel approach to the convenient and environmentally benign synthesis of amide COFs, which may facilitate their wider applications.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2024
·
IF 6.7
Meng Zhaohui,Liao Ying,Liu Ling,Li Yaqian,Yan Hao,Feng Xiang,Chen Xiaobo,Liu Yibin,Yang Chaohe
Improving the efficiency of metal/reducible metal oxide interfacial sites for hydrogenation reactions of unsaturated groups (e.g., C=C and C=O) is a promising yet challenging endeavor. In our study, we developed a Pd/CeO 2 catalyst by enhancing the oxygen vacancy (O V ) concentration in CeO 2 through high-temperature treatment. This process led to the formation of an interface structure ideal for supporting the hydrogenation of methyl oleate to methyl stearate. Specifically, metal Pd 0 atoms bonded to the O V in defective CeO 2 formed Pd 0 –O V –Ce 3+ interfacial sites, enabling strong electron transfer from CeO 2 to Pd. The interfacial sites exhibit a synergistic adsorption effect on the reaction substrate. Pd 0 sites promote the adsorption and activation of C=C bonds, while O V preferably adsorbs C=O bonds, mitigating competition with C=C bonds for Pd 0 adsorption sites. This synergy ensures rapid C=C bond activation and accelerates the attack of active H* species on the semi-hydrogenated intermediate. As a result, our Pd/CeO 2 -500 catalyst, enriched with Pd 0 –O V –Ce 3+ interfacial sites, demonstrated excellent hydrogenation activity at just 30 °C. The catalyst achieved a Cis–C18:1 conversion rate of 99.8% and a methyl stearate formation rate of 5.7 mol/(h·g metal ). This work revealed the interfacial sites for enhanced hydrogenation reactions and provided ideas for designing highly active hydrogenation catalysts.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Taoli Deng,Zan Ding,Shuang Zheng,Rong-Jun Xie
Ce3+-doped nitride phosphors are promising color converters in laser-driven lighting and display technologies, but they suffer from serious loss in luminescence efficiency caused by the interfacial reaction between phosphor powders and glass powders during the fabrication of phosphor-in-glass bulks or films. In this work, the oxygen-free organic–inorganic hybrid glass (OIHG) Zn(Im)3(HbIm) (ZIF-62) was used instead of the traditional oxide glass to prepare an La3Si6N11:Ce3+ (LSN) phosphor converter by cofiring LSN with the ZIF-62 glass. The LSN phosphor-in-ZIF-62 glass converter well maintains the internal quantum efficiency of the original phosphor powders, showing a luminescence loss of only ∼1%. The sandwich-structured LSN-in-ZIF-62 glass converter, constructed by cofiring it with sapphire substrates, enables the generation of white lighting with a maximum luminous flux of 872.2 lm and a luminous efficacy of 291 lm W−1 when pumped by a blue laser diode at a powder density of 5.99 W mm−2. The use of the oxygen-free ZIF-62 glass provides a viable method to design nitride phosphor-based color converters for low-power laser-driven lighting, high-power LED lighting or projection applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2020
·
IF 2.615
Yin CHEN,Shao-wen XIE,Chao TONG,Hai-hu TAN,Li-jian XU,Na LI,Jian-xiong XU
Novel hydrophilic NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 :Ce 3+ ,Eu 3+ double-jacket microtubes (DJMTs) with upconversion/ downconversion dual-mode luminescence were designed and prepared through epitaxial growth of NaGdF 4 :Ce 3+ , Eu 3+ shell onto the NaYF 4 :Yb 3+ ,Tm 3+ microtube via poly(acrylic acid) (PAA) mediated hydrothermal method. It is demonstrated that PAA ligand played an important role in guiding the direct growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell onto the surface of NaYF 4 :Yb 3+ ,Tm 3+ parent microtubes. The growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell experienced a crystal phase transition from β -NaGdF 4 and β -NaYF 4 mixture to β -NaYF 4 @NaGdF 4 composite crystal, and morphology evolution from mixture of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and β -NaYF 4 :Yb 3+ ,Tm 3+ microtubes to NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 : Ce 3+ ,Eu 3+ DJMTs. The formation mechanism of DJMTs was the dissolution−renucleation of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and the growth of β -NaGdF 4 :Ce 3+ ,Eu 3+ shell via the classical Ostwald ripening mechanism. The as-prepared DJMTs could exhibit blue upconversion and red downconversion luminescence, which was further made into environmentally benign luminescent inks for creating highly secured and fluorescent-based anti-counterfeiting patterns via inkjet printing.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2020
·Vol. 96
·期 3
·753-762
·
IF 2.008
Zhu Rui,Bi Zun,Jia Ke,Liu Yunfei,Lyu Yinong
A series of single-component ScF 3 :Dy 3+ , Eu 3+ , Ce 3+ phosphors prepared by means of microwave hydrothermal method were explored for light-emitting diodes. The as-prepared samples were characterized via X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) spectroscopy. In order to rationalize the experimental results, first-principle calculations based on density functional theory had been carried out to discover electronic structures. PL performance of the RE 3+ -doped phosphors exhibited well-defined bands in the visible region. By adjusting the ratios of Ce/Dy/Eu, the color of the as-prepared phosphors can vary from blue (0.24, 0.23) to red (0.51, 0.30) across the white (0.34, 0.26) region according to the chromaticity coordinates. The results suggested that the Dy/Eu/Ce-doped ScF 3 might act as down-convert phosphors for near ultraviolet light-emitting diodes, especially for white LEDs. What is more, it can also promote a deep comperhension of the relationship between structure and properties in ScF 3 -based phosphors.
ScF 3 :RE 3+ phosphors with alterable bandgaps can emit light from blue to orange–red across white under the excitation of near ultraviolet light. Introduction of rare earth ions induced the variation of energy band structures in ScF 3 -based phosphors because of the existence of f , p , and d orbits in RE 3+ , therein f and p orbits of RE 3+ made the band structure downwards, the p hybridizing with Sc-3 d promoted the band toward high-energy region.
研究领域:
材料科学
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光学
✓ 已验证
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Chunlong Han,Li Luo,Guoshuai Dong,Wei Zhang,Yinhai Wang
Novel YAG:Ce 3+ , Pr 3+ , Yb 3+ phosphors were synthesized using a high temperature solid state reaction method. The XRD patterns revealed that the obtained samples belong to the single phase YAG. The optical spectra demonstrated that Pr 3+ could be a bridge to facilitate the energy transfer from Ce 3+ to Yb 3+ in the YAG host. Blue light excited Ce 3+ and a yellow emission from Ce 3+ together with a near infrared emission of Yb 3+ was obtained. The effect of Pr 3+ doping on the energy transfer efficiency was explored. When the doping concentration of Pr 3+ increased, the yellow emission intensities of Ce 3+ decreased and the near infrared emission intensity of Yb 3+ increased monotonously. Hence, the efficiency of energy transfer from Ce 3+ to Yb 3+ is enhanced by the addition of Pr 3+ , implying that the YAG:Ce 3+ , Pr 3+ , Yb 3+ phosphors are promising downshifting materials and have the potential to be used in Si-based solar cells.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2023
·
IF 6.2
Tao Wang,Haowei Fang,Subate Yalikun,Jinyan Li,Yuqing Pan,Kunxi Zhang,Jingbo Yin,Haiyan Cui
Developing strong anti-inflammatory wound dressings is of great significance for protecting inflammatory cutaneous wounds and promoting wound healing. The present study develops a nanocomposite Pluronic F127 (F127)-based hydrogel dressing with injectable, tissue adhesive, and anti-inflammatory performance. Briefly, Ce3+/tannic acid/ulinastatin nanoparticles (Ce3+/TA/UTI NPs) are fabricated. Meanwhile, α-lipoic acid is bonded to the ends of F127 to prepare F127-lipoic acid (F127LA) and its nanomicelles. Due to the gradual viscosity change instead of mutation during phase transition, the mixed Ce3+/TA/UTI NPs and F127LA nanomicelles show well-performed injectability at 37 °C and can form a semisolid composite nanohydrogel that can tightly attach to the skin at 37 °C. Furthermore, ultraviolet (UV) irradiation without a photoinitiator transforms the semisolid hydrogel into a solid hydrogel with well-performed elasticity and toughness. The UV-cured composite nanohydrogel acts as a bioadhesive that can firmly adhere to tissues. Due to the limited swelling property, the hydrogel can firmly adhere to tissues in a wet environment, which can seal wounds and provide a reliable physical barrier for the wounds. Ce3+/TA/UTI NPs in the hydrogel exhibit lipopolysaccharide (LPS)-scavenging ability and reactive oxygen species (ROS)-scavenging ability and significantly reduce the expression of inflammatory factors in wounds at the early stage, accelerating LPS-induced wound healing.
研究领域:
材料科学
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医学
·
药学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 4
·1530-1540
·
IF 8.067
Shisheng Lin,Hang Lin,Pengfei Wang,Ping Sui,Hongyi Yang,Ju Xu,Yao Cheng,Yuansheng Wang
Phosphor-converted white laser diode (pc-wLD) technology requires high-color-quality white light, which involves the development of an efficient red-emitting phosphor color converter. With regard to this, we have developed a new kind of orange-yellow-emitting Lu2−xMg2Al2−yGaySi2O12:xCe3+ (LMAGS:Ce3+) solid-solution phosphor, which shows the desired abundant red-emissive components and nanosecond-range luminescent decay. LMAGS:Ce3+ is further compounded into an all-inorganic phosphor-in-glass (PiG) composite tightly bonded to a high-thermal-conductivity sapphire plate (SP) in the form of a film. There is no obvious interfacial reaction between phosphor and glass during co-sintering, which ensures good luminescent properties are retained. A comparative study was conducted to reveal the microstructure–property relationship and the key influencing factors of luminescence saturation upon being driven by a blue laser. “One-dimensional photonic crystal film” and “phosphor wheel” designs were adopted to further enhance the luminescent performance, successfully improving the luminous flux of the generated white light to 393.8 lm @ 5 W mm−2 under static–transmissive excitation mode and 1080 lm @ 20 W mm−2 under rotatory–reflective excitation mode. Probing into the luminescence saturation mechanism, the effects of thermal saturation and optical saturation were demonstrated, accounting for 44.0% and 56.0% contributions, respectively. A fabricated prototype neutral/warm-white LD lighting source based on LMAGS:Ce3+ PiG film-on-SP shows high light collimation and comfortable visual perception, demonstrating the bright application potentials of the developed composite material.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Qi Zhang,Qian Ma,Xueying Wang,Yi Wang,Dongheng Zhao
In the present work, a series of CeO 2 /WO 2.9 composites with a tunable structure and thickness are originally fabricated by innovating different additional quantities of H 2 WO 4 during the hydrothermal process. Optimal Ce/W-0.25 sensors have a higher response value of 23.68 to 100 ppm n -butanol at room temperature than that of pure CeO 2 (1.26) at 200 ℃. The unique surface double oxygen defect engineering between CeO 2 and WO 2.9 has a remarkable role in enhanced gas sensing, formation of the CeO 2 -WO 2.9 heterojunction, and effective surface/interface transport mechanism. The electron transfer between WO 2.9 and CeO 2 driven by oxygen defects on the surface of CeO 2 can easily facilitate the interconversion between Ce 3+ and Ce 4+ . This work provides a new insight and the facile fabrication pathway for constructing double oxygen defects-derived CeO 2 -based heterostructures for developing novel n -butanol gas sensors with excellent sensing performance at room temperature.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
传感器与执行器
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 42
·期 27
·9852-9861
·
IF 3.806
Yuan Wu,Dongmei Yang,Xiaojiao Kang,Ping'an Ma,Shanshan Huang,Yang Zhang,Chunxia Li,Jun Lin
Multifunctional nanocomposites integrating mesoporous and luminescence properties into a single entity are synthesized via a facile and effective approach. Oleic acid capped β-NaYF4:Ce3+/Tb3+ nanoparticles (NPs) are transferred into aqueous solution by cetyltrimethylammonium bromide (CTAB) surfactants, and further encapsulated with uniform mesoporous silica shell followed by the surface modification with poly(ethylene glycol) (PEG), leading to the formation of water-dispersible and biocompatible core–shell structured β-NaYF4:Ce3+/Tb3+@mSiO2-PEG (denoted as NPs@mSiO2-PEG) nanospheres. The as-synthesized nanospheres show a typical mesoporous structure and a green emission under UV irradiation. Doxorubicin hydrochloride (DOX), a widely used anti-cancer drug, is used as a model drug to evaluate the loading and controlled release behaviors of the NPs@mSiO2-PEG in phosphoric acidic buffer solutions (PBS) at different pH values (pH = 7.4 and 5.0). The composite carriers provide a pH-sensitive drug release pattern and the drug releases faster under lower pH value. The endocytosis process of fluorescein isothiocyanate (FITC)-labelled nanospheres is characterized using flow cytometry and confocal laser scanning microscopy (CLSM) against A549 cells. The in vitro cytotoxic effect against A549 cells of the DOX-loaded carriers is investigated in detail. In addition, the extent of drug release can be monitored by the variation of photoluminescence (PL) intensity of β-NaYF4:Ce3+/Tb3+. Considering the good biocompatibility and pH-dependent drug release pattern, such core–shell structured luminescent NPs@mSiO2-PEG nanospheres have potential applications in controlled drug delivery.
研究领域:
生物材料
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纳米医学
·
肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Xiaohao Chen,Su Zhang,Ran Pang,Jiarao Shi,Xuexia Chen
Traditional commercial white light-emitting diodes (WLEDs) suffer from insufficient cyan light intensity and substandard spectral continuity, which restricts their application in the field of high-end lighting. To improve the performance of WLEDs, there is an urgent need for suitable and bright cyan phosphors. Herein, we report a bright cyan-emitting phosphor BaAlSi 5 N 7 O 2 :Ce 3+ , which exhibits a broadband centered at 479 nm with a full-width at half-maximum (FWHM) of 99 nm. The phosphor also exhibits exceptional thermal stability, retaining 94% of its room-temperature luminescence intensity at 150 °C. When integrated into full-spectrum phosphor-converted WLEDs, BaAlSi 5 N 7 O 2 :Ce 3+ effectively compensates for cyan light deficiency in blue/yellow/red phosphor systems and enhances the color rendering index (Ra) of RGB (red/green/blue)-based WLEDs. Furthermore, BaAlSi 5 N 7 O 2 :Ce 3+ serves as an independent high-efficiency cyan component, replacing conventional blue modules to reduce harmful high-energy blue light exposure. In full-spectrum WLEDs fabricated by combining this phosphor with commercial red/green phosphors on near-ultraviolet (n-UV) LED chips, the device achieves Ra = 94.2, correlated color temperature (CCT) = 4044 K, and minimal high-energy blue light (∼5%). It demonstrates stable chromaticity coordinates and high luminous efficiency under 10–120 mA current, providing a high-performance cyan phosphor solution for healthy lighting.
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2026
·
IF 2.6
Jiaqi Zhang,Zhiyu Qin,Langping Dong,Baiqi Shao,Jingshan Hou,Yongzheng Fang
A novel green-emitting phosphor, Ca2HfSi4O12:Ce3+, Tb3+ (CHSO:Ce3+, Tb3+), was successfully fabricated via a conventional solid-state reaction under high-temperature conditions. The phosphor shows two broad excitation bands (200-400 nm), which can be attributed to the characteristic 4f → 5d electronic transitions of Ce3+ ions. As an efficient sensitizer, Ce3+ transfers absorbed ultraviolet energy to Tb3+ ions, resulting in a strong green luminescence peaking at 543 nm when excited at 330 nm. The optimized composition, CHSO:0.02Ce3+, 0.035Tb3+, exhibits a high internal quantum efficiency (IQE) of 88.65% and an external quantum efficiency (EQE) of 54.0% under 330 nm excitation, together with excellent luminous thermal stability, maintaining 90% of its emission intensity at 393 K. White light-emitting diodes (WLEDs) were assembled using CHSO:Ce3+,Tb3+ in conjunction with a 310 nm UV chip and commercial blue BaMgAl10O17:Eu2+ and red (Ca, Sr)AlSiN3:Eu2+ phosphors, yielding a high color rendering index (Ra = 90.2) and a correlated color temperature of 5157 K. These findings highlight CHSO:Ce3+, Tb3+ as an efficient and thermally stable green phosphor with significant potential for UV-pumped WLED applications.
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DOI
高影响因子
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