CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Siping Wang,Zhaoyang Chen,Shala Bi,Zuyang Gao,Houjin Hu,Yi Liu,Bolong Zhang
Developing luminescent materials with lower cost and higher temperature sensitivity can provide more options for achieving precise optical thermometry. Therefore, the Tb 4 O 7 and Eu 2 O 3 co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses for optical thermometry were designed and synthesized using a high-temperature melting and quenching method. Due to the low optical basicity and the formation of defects of the glasses, the coexistence of Eu 2+ and Eu 3+ ions was achieved without the reducing agent. In Eu 2 O 3 doped glasses, the relative content variation of Eu 2+ and Eu 3+ ions was analyzed using high-resolution X-ray photoelectron spectroscopy. Emission spectra and fluorescence lifetimes confirmed the effective energy transfer processes between Eu 2+ and Tb 3+ or Tb 3+ and Eu 3+ , which play critical roles in the tunable white emission properties of the material. In the temperature-dependent fluorescence spectra, Eu 2+ ions exhibit significant thermal quenching behavior, which is key to achieving higher temperature sensitivity in optical thermometry. The Eu 2+ /Tb 3+ /Eu 3+ co-doped glasses were investigated for their optical temperature sensing behavior, utilizing the fluorescence intensity ratio techniques, within the temperature range of 273 K–498 K. The maximum absolute (at 498 K) and relative (at 273 K) sensitivity based on the fluorescence intensity ratio, were observed for Eu 2+ /Eu 3+ pairs were 0.145 K −1 and 1.46 % K −1 , respectively, outperforming the conventional Tb 3+ /Eu 3+ combination. Additionally, no significant fluctuation occurred during the repeated experiment. This work demonstrates that Eu 2+ /Tb 3+ /Eu 3+ co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses could be considered a promising candidate for optical thermometry.
研究领域:
材料科学
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光学
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DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 24
·11452-11459
·
IF 7.233
Lijia Liu,Jitao Li,John A. McLeod
We report a series of Eu-substituted methylammonium lead tribromide quantum dots (MAPb1−xEuxBr3 QDs). The crystallinity of these QDs increases with increasing Eu content, while there is only a small change in the lattice constant, and the morphology of the MAPb1−xEuxBr3 QDs is unaffected by the Eu content. This demonstrates that Eu is a suitable element for substituting Pb while retaining the original crystal structure. We observe blue photoluminescence (PL) consistent with Eu2+, which, at high Eu content (x = 0.3), contributes luminescence intensity equal to the green PL of unsubstituted MAPbBr3 QDs. As Eu is a less toxic substitute for Pb, that also provides blue luminescence, MAPb1−xEuxBr3 QDs may prove to be a valuable optoelectronic material.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 16
·1-14
·
IF 2.8
Cao Renping,Cao Ya,Rong Yongtong,Lan Bang,Nie Jingheng,Zhang Lei,Chen Yuyu,Wang Jing
Eu 3+ and Dy 3+ as activators in luminescence materials have been widely investigated because of their superior luminous properties. In this work, we synthesize Sr 2 MgSi 2 O 7 :Dy 3+ , Sr 2 MgSi 2 O 7 :Eu 3+ , and Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ in air via the solid-state reaction method. We research crystal phase and purity of all samples via XRD, discern their crystal structure and space-group, and investigate their luminescence properties. The yellow emission of Sr 2 MgSi 2 O 7 :Dy 3+ with emission spectrum in the range of 450–775 nm can be observed due to the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ ion. The red emission of Sr 2 MgSi 2 O 7 :Eu 3+ in the range of 550–725 nm is shown owing to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ under excitation 388 nm shows yellow emission with chromaticity coordinates (0.3578, 0.3911) and glows red–orange light with chromaticity coordinates (0.5753, 0.3863) under excitation 394 nm. Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ can shows tunable emission when the ratio between Eu 3+ and Dy 3+ ions is changed. The energy transfer from Dy 3+ to Eu 3+ ions are known via the spectral features. Sr 2 MgSi 2 O 7 :Eu 3+ , Dy 3+ has a good thermal stability. Luminous mechanisms and energy transfer process of samples are analyzed by the energy level diagrams of Dy 3+ and Eu 3+ ions.
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
DYES AND PIGMENTS
·
2024
·
IF 4.1
Ying Li,Ji-Ji Xia,Jia-Zhen Lu,Zi-Long Wang,Mi-Tang Wang
In the food industry, ascorbic acid (AA) is widely used as an antioxidant . However, the concentration of AA is influenced by various factors, including temperature, time, and pH value during food preparation and storage, leading to its instability in content. This makes the accurate detection of AA content particularly important. Precise determination of AA content in food and pharmaceuticals is crucial for ensuring the adequate intake of essential vitamins and maintaining good health. Herein, we have developed a successful preparation method of an imidazole-based ionic liquid functionalized CDs hybrids APM-CDs. A novel photo functional hybrid probe Eu 3+ @APM-CDs was obtained via an ion-exchange reaction between APM-CDs and lanthanide complex Eu(DPA) 3 . The obtained hybrid probe was extensively characterized in detail. What's more, the results show that the fluorescent intensity of Eu 3+ @APM-CDs has a good linear response to AA concentrations in the range of 25–500 μM (R 2 = 0.99), with a detection limit of 80 nM. The fluorescence probe demonstrates good selectivity and sensitivity toward AA and has the potential for significant application in AA detection by simplifying procedures and reducing interference from impurities.
研究领域:
食品科学
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分析化学
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生物医学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
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2024
·
IF 5.2
Xiayu Liang,Aylin M. Deliormanlı,Qingle Zeng
A novel composite material, Poly(IL-AA)@MIL-101(Cr), combining metal-organic framework, polymeric ionic liquid and acrylic acid, was synthesized for the selective and efficient adsorption of rare earths europium(III) (Eu 3+ ). Characterization of the materials was carried out using techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), thermogravimetric analysis (TGA) and Brunauer-Emmett-Teller (BET). The results demonstrate successful incorporation of the polymeric ionic liquid onto the material surface while preserving the crystal structure and morphology of MIL-101(Cr). Adsorption experiments were conducted to explore parameters including solution pH, initial Eu 3+ concentration, and duration, with comprehensive analyses of adsorption kinetics, isotherms, and mechanisms. Findings reveal that Poly(IL1-AA)@MIL-101(Cr), Poly(IL3-AA)@MIL-101(Cr), and Poly(IL5-AA)@MIL-101(Cr) achieve adsorption equilibrium for Eu 3+ at approximately 9 h with an equilibrium pH of 6.2. The adsorption of Eu 3+ predominantly follows a pseudo-second-order kinetic model and Langmuir isotherm adsorption model. Moreover, the prepared composite material exhibits superior adsorption selectivity for Eu 3+ over other metal ions in the mixture (K + , Mg 2+ , Ni 2+ , Co 2+ , Zn 2+ , La 3+ , and Nd 3+ ). Even after five adsorption-desorption cycles, the composite material maintains satisfactory adsorption performance.
研究领域:
材料科学
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环境科学
✓ 已验证
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Li,Yong Hong Ma,Aihua Mao,Xiwei Qi
A series of transparent (1- y )La 2 O 3 –Ga 2 O 3 - y Sm 2 O 3 - x Eu 2 O 3 (where x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, and y = 0, 0.04) were successfully synthesized using a containerless solidification process. Co-doping with Sm 3+ and Eu 3+ enhanced the energy absorption of Eu 3+ , notably improving the characteristic emission peak 5 D 0 - 7 F 2 of Eu 3+ . The peak emission intensity for y = 0.04 was observed at x = 0.08, attributable to the concentration quenching of Eu 3+ ions. As the concentration of Eu 3+ increased, the energy transfer effect on emission intensity diminished. Attributed to the energy transfer between Sm 3+ and Eu 3+ , Sm 3+ may primarily serve as the sensitizer, and Eu 3+ as the activator. According to the Dexter theory, which suggests that the interaction between activator ions and their adjacent ions is the primary mechanism of energy transfer and quenching among Eu 3+ ions and adjacent ions, an increase in Eu 3+ concentration leads to a decrease in the distance between Eu 3+ and adjacent ions, strengthening their interaction, and potentially inducing concentration quenching. Furthermore, with an increase in Eu 3+ concentration, the CIE chromaticity coordinates for the samples co-doped with Sm 3+ and Eu 3+ shifted significantly, enhancing the color purity of the emitted light and bringing it closer to the NTSC color standard coordinates (0.67, 0.33).
研究领域:
材料科学
·
光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinzhe Zhou,Li Guan,Huanrong Li
The white LEDs with high performance and excellent luminous quality is of high importance for developing the current lighting industry, and high thermally stable blue phosphors play a critical role in the preparation of white LEDs. Herein, we reported a facile way to obtain highly efficient blue Eu 2+ -doped celsian phosphor with excellent thermal stability by a phase transformation of Ba 2+ -exchanged SOD Zeolite strategy. The structure of phosphors changed from nepheline to celsian with the doping of Ba 2+ , and the maximum emission intensity blue-shifts from 550 nm to 450 nm under the excitation of 370 nm. The PLQY is determined to be 56 %, 96 % and 82 % for the phosphor with Ba 2+ doping concentration being 0, 1.49 and 1.86, respectively, and the luminescence intensity at 423 K is can be 80 %, 102 % and 93 % of its intensity at room temperature. Finally, the package of the LED device based on our yellow and blue phosphors together with the commercial red CaAlSiN 3 :Eu 2+ phosphor is constructed to show warm white light with the CCT of 3705 K and a high CRI of 97.7. This study provides a facile way for obtaining satisfactory phosphors for high-quality lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Shao-Rong Bie,Ding-Shun She,Wen Yue
A series of new apatite-type red-emitting Ca 10 (PO 4 ) 6 F 2 :Eu 3+ phosphors have been synthesized via the hydrothermal method. The Rietveld refinement results indicate that when the Eu doping concentration is less than 14 mol.%, the phosphor maintains a pure fluorapatite phase with no detectable impurities, and the Eu 3+ ions preferentially occupy the Ca2 sites within the host lattice. The PL emission spectrum under the excitation of 352 nm consists of the highest emission band (618 nm) and four relatively weak emission bands (579 nm, 591 nm, 653 nm and 696 nm) which correspond to the 5 D 0 → 7 F J transitions (J = 0, 1, 2, 3 and 4). The emission intensity decreases at concentrations above 10 mol.%, due to dipole-dipole interactions and concentration quenching. The Commission Internationale de l’Éclairage (CIE) chromaticity coordinate of the Ca 10 (PO 4 ) 6 F 2 :Eu 3+ (x = 10 mol.%) phosphor is near (0.6341,0.3652). The color purity is approximately 86.95 % and the internal quantum yield is 62.8 %. The activation energy for thermal quenching for this phosphor is 0.29 eV, and more than 50 % of its emission intensity is retained at 498 K, demonstrating excellent thermal stability. Owing to their outstanding thermal quenching luminescence properties, the Ca 10 (PO 4 ) 6 F 2 :Eu 3+ phosphors are well-suited for application in white-LEDs, acting as the red-emitting component in warm white light generation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Rui Zhu,Yushun Zeng,Shanchuan Liang,Yu Zhang,Yunhui Qi,Yunfei Liu,Yinong Lyu
A facile microwave-assisted hydrothermal method has been employed to synthesize a series of ScF 3 : x Eu 3+ , y Bi 3+ ( x = 0 −0.20, y = 0–0.05) crystals to improve the fluorescence performance by optimizing the concentrations of Eu 3+ ions and Bi 3+ ions. The as-obtained products then were characterized by thermal field emission scanning electron microscope (FE-SEM), X-ray powder diffractometer (XRD), high resolution transmission electron microscope (HRTEM), and photoluminescence (PL) spectrometer, systematically. The results manifest that the reaction temperature and reaction time play an significantly important role on the morphologies and sizes of the as-prepared products. Furthermore, the optical properties of ScF 3 : x Eu 3+ , y Bi 3+ samples was investigated in detail. The emission spectra of ScF 3 : x Eu 3+ recorded upon the excitation wavelength of 394 nm showed a strong emission peak located at 592 nm, which is corresponding to the magnetic dipole of the 5 D 0 – 7 F 1 transition of Eu 3+ ions. Additionally, it was found that the luminescence of the samples has been deeply enhanced after the addition of an appropriate amount of Bi 3+ . The opportune concentration of Eu 3+ and Bi 3+ are x = 0.10 and y = 0.02, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xin Zhang,Ke Jiang,Huajun He,Dan Yue,Dian Zhao,Yuanjing Cui,Yu Yang,Guodong Qian
A fluorescent pH sensor based on post-synthetically modified nanoscale UiO-67-bpydc by encapsulating Eu 3+ cations in the pores was fabricated. The Eu 3+ incorporated sample (Eu 3+ @UiO-67-bpydc) shows excellent luminescence due to the sensitization and protection provided by the parented framework. Subsequently, Eu 3+ @UiO-67-bpydc was developed as a pH sensor. Eu 3+ @UiO-67-bpydc shows good chemical resistance to both acidity and alkalinity solutions with pH ranging from 1.06 to 10.99, which makes it potentially useful for wide-range pH sensor. In addition, cycling experiments have demonstrated the utilizability of the sensor. The MTT analysis shows that Eu 3+ @UiO-67-bpydc possesses favourable biocompatibility. Furthermore, fluorescence imaging of Eu 3+ @UiO-67-bpydc in PC12 cells was also performed to test its feasibility in vivo. Given its exceptional stability and pH-dependent fluorescent intensity, the fluorescent probe should be a promising candidate for application in fluorescent pH sensing in vitro and in vivo.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Xiang-Yang Chen,Zhi-Jun Zhang,Ang Feng,Meng Xu,Jing-Tai Zhao,Fang-Fang Xu
Density functional theory calculations on monoclinic Lu 2 WO 6 is carried out using the Cambridge Sequential Total Energy Package code. The result indicates that Lu 2 WO 6 is a broad band gap semiconductor with an indirect band gap of 3.13 eV. Eu ions are trivalency and the average coordination number is 7.6(5), indicating that the site of Lu is occupied by Eu. The activation energy Δ E is calculated as 0.314 eV. In addiation, the thermal quenching mechnism of Eu-activated Lu 2 WO 6 and the different concentration quenching mechanisms for 5 D 0 and 5 D 1 emissions of Eu ions have been proposed.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Hui Yu,Xinan Shi,Lijian Huang,Xiaojiao Kang,Daocheng Pan
Eu 3+ /Tb 3+ -doped CaMoO 4 /SrMoO 4 luminescent thin films were deposited by a facile solution method, and were annealed over the temperature range of 350–650 °C. Luminescent thin films were characterized by means of X-ray diffraction (XRD), photoluminescence (PL), UV–vis absorption, scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). In addition, the effects of alkali metal ions (Li + , Na + and K + ) on the luminescence properties of CaMoO 4 /SrMoO 4 thin films were systematically investigated. We found that the optimal chemical compositions for the luminescent molybdate thin films are Ca 0.87 MoO 4 :Eu3+ 0.10, K+ 0.03, Sr 0.82 MoO 4 :Eu3+ 0.15, K+ 0.03, Ca 0.87 MoO 4 :Tb3+ 0.03, Li+ 0.1, and Sr 0.82 MoO 4 :Tb3+ 0.15, Li+ 0.03.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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