CERAMICS INTERNATIONAL
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2025
·
IF 5.6
Yongtao Li,Xiankuo Wang,Weina Li,Han Xia,Jiao Li,Haina Qi,Xuejian Zhang,Dexin Huang,Huisheng Liu,C.K. Mahadevan
The NaCl:xEu 3+ (x = 0.002, 0.004, 0.006, 0.008, 0.01, 0.02) ceramics were synthesized using a cold sintering method under varying temperature and pressure conditions. The impact of Eu 3+ ions on the structural and optical properties of NaCl ceramics was examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), analytical scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), UV–visible spectroscopy, reflectance spectroscopy, photoluminescence (PL) spectroscopy, and fluorescence lifetime measurements. XRD analyses confirmed the incorporation of Eu ions into the matrix lattice. SEM results indicated that the ceramics achieved high density when the uniaxial pressure exceeded 300 MPa. EDS analysis demonstrated a well-distributed presence of rare earth ions, devoid of impurities. PL spectroscopy revealed that the intensity of the emission spectra increased the increase of Eu 3+ concentration and observed the optimal luminescence performance at x = 0.01 mol% and a sintering temperature of 125 °C. XPS results indicated that the Eu ions were predominantly in a trivalent state within the NaCl ceramics. Collectively, the above results provide valuable insights for the preparation of rare-earth doped alkali halide ceramics using cold sintering technology.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 20
·4954
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IF 3.1
Wenhui Lou,Yang Tang,Haohong Chen,Yisong Lei,Hui Lin,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Eu 3+ -doped Y 2 O 3 -based luminescent materials can be used as a scintillator for electron or high energy β-ray irradiation, which are essential for applications such as electron microscopy and nuclear batteries. Therefore, it is essential to understand their defect mechanisms and to develop materials with excellent properties. In this paper, Y 2 O 3 -based transparent ceramics with different Eu 3+ doping concentrations were prepared by solid-state reactive vacuum sintering. This series of transparent ceramic samples exhibits strong red emission under electron beam excitation at the keV level. However, color change appears after the high-energy electron irradiation due to the capture of electrons by the traps in the Y 2 O 3 lattice. Optical transmittance, laser-excited luminescence, X-ray photoelectron spectroscopy (XPS), and other analyses indicated that the traps, or the color change, mainly originate from the residual oxygen vacancies, which can be suppressed by high Eu doping. Seen from the cathodoluminescence (CL) spectra, higher doping concentrations of Eu 3+ showed stronger resistance to electron irradiation damage, but also resulted in lower emissions due to concentration quenching. Therefore, 10% doping of Eu was selected in this work to keep the high emission intensity and strong radiation resistance both. This work helps to enhance the understanding of defect formation mechanisms in the Y 2 O 3 matrix and will be of benefit for the modification of scintillation properties for functional materials systems.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
CELLULOSE
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2025
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IF 4.8
Chang Hui,Kang Wenjia,Zhao Xinyu,Chang Shuai,Li Xinping,Luo Yuxia,Xiong Chuanyin,Zhu Xunjin,Zhang Zhao
The circularly polarized luminescence (CPL) of Eu 3+ ions have been highly valued due to their high asymmetry factor and characteristic luminescence. However, most of the CPL of Eu 3+ ions is contributed from the magnetic dipole transitions and much less is from the electric dipole transitions due to the influence of coordination fields. Until now, the amplification of the asymmetry factor ( g lum ) of CPL is mainly due to magnetic dipole transition g lum ( g lum-mag ), while electric dipole transition g lum ( g lum-ele ) has almost no amplification. In this study, nanocellulose chiral films were synergistically induced with chiral β -diketones Eu-TFC ( d / l ) and hybrid photonic crystal films CNC@Eu-TFC ( d / l ) targeted methods for achieving electric dipole transition CPL and g lum-ele of Eu 3+ ions. The g lum-ele was higher than g lum-mag , achieving a reversal of g lum-ele and g lum-mag sizes. The g lum of CNC@Eu-TFC ( l ) was relatively higher than that of CNC@Eu-TFC ( d ), the main reason for which was that the macroscopic chirality of the nanocellulose film, with a left-handed spiral structure, had a stronger synergistic induction effect with left-handed Eu-TFC ( l ). Therefore, utilizing the macroscopic chirality of CNC films could effectively amplify the difficulty to activate g lum-ele of Eu 3+ ions, providing a new approach for its preparation in high-performance CPL materials. Graphical abstract
研究领域:
材料科学
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光学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 6
·1-10
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IF 1.455
Mou Yongren,Kang Ming,Liu Min,Wang Feng,Chen Kexu,Sun Rong
In order to investigate the effect of amphiphilic additional agents on the morphology (particle shape, particle size and particle size distribution) and photoluminescence performance of calcium carbonate phosphor, the phosphors AA-CaCO 3 :Eu 3+ (AA = glycerol or sodium dodecyl sulfate) were synthesized by the microwave-assisted co-precipitation method using glycerol (Gly) and sodium dodecyl sulfate (SDS) as amphiphilic additional agents (AA), respectively. The phase structure, morphology and luminescent properties of the as-synthesized samples were characterized by X-ray diffraction, scanning electron microscope, laser diffraction particle size analyzer and Fluorescence spectrophotometer, respectively. The results showed that the phase structure and morphology of AA-CaCO 3 :Eu 3+ changed along with different types and amount of amphiphilic additional agents evidently. The particle size of Gly-CaCO 3 decreased to 1.383 µm when the volume ratio reached 8:2 (Gly:H 2 O). Photoluminescence (PL) spectra show that all the AA-CaCO 3 :Eu 3+ phosphors exhibit strong red emission peak originating from electric-dipole transition 5 D 0 → 7 F 2 (614 nm) of Eu 3+ ions and the amphiphilic molecules (Gly and SDS) had a huge influence on photoluminescence intensity.
研究领域:
材料科学
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光学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2017
·
IF 3.615
Jun Zhang,Dan Yue,Tifeng Xia,Yuanjing Cui,Yu Yang,Guodong Qian
A novel metal-organic framework film MIL-124 film was prepared on porous α-Al 2 O 3 ceramic plate by in situ synthesizing. After introducing Eu 3+ ions to the free -COOH sites of the MIL-124 ligand channels, a luminescent MOF film MIL-124@Eu 3+ was obtained. Based on the chemical reaction between NH 3 and the -COOH, the formation of -COONH 4 which was demonstrated by FT-IR spectrum, affected the energy transfer between Eu 3+ ions and ligand, quenching the characteristic emission of MIL-124@Eu 3+ film. The limit of detection to ammonia was calculated as 26.2 ppm in ambient air. The XRD results demonstrated the long-term stability of this ammonia sensor. The excellent performance and economical synthesizing strategy of the MIL-124@Eu 3+ film exhibited potential application of this sensor for detecting ammonia gas.
研究领域:
材料科学
·
化学传感器
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Xiaotong Li,Kaimei Fan,Ruimei Yang,Xiuxiu Du,Baohan Qu,Xiangmin Miao,Lihua Lu
Different from fluorescent dyes-doped or carbon materials-based ratiometric tetracycline nanoprobes, herein, a new Ir(III) complex-doped and europium(III) ion (Eu 3+ )-functionalized silicon nanoparticles (Ir(III)@SiNPs-Eu 3+ ) with long luminescent lifetimes was firstly fabricated for selective detection of tetracycline (TC) in complex systems through time-resolved emission spectra (TRES) measurement. In the presence of TC, the red phosphorescence of Eu 3+ is greatly enhanced by adsorption energy transfer emission (AETE) of TC, while the strong green luminescence of Ir(III)@SiNPs is quenched by the inner filtration effect (IFE) of TC. Based on these striking emission changes, Ir(III)@SiNPs-Eu 3+ can sensitively detect TC in the linear range of 0.01–20 μM with a detection limit of 4.9 × 10 –3 μM. Benefitting from the long lifetime of Ir(III)@SiNPs-Eu 3+ , the nanoprobe demonstrates excellent TC detection performance through TRES in high background system of 5 % human serum. Furthermore, the formed Ir(III)@SiNPs-Eu 3+ /TC complex can be used to sensitively recognize Hg 2+ via a ratiometric luminescence mode. Notably, the cytotoxicity of Ir(III)@SiNPs-Eu 3+ is very low and thus the sensitive monitoring the detection of Ir(III)@SiNPs-Eu 3+ to TC and Hg 2+ also works well in porcine renal cells, demonstrating high application potential in real samples.
研究领域:
分析化学
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生物医学工程
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材料科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）