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
✓ 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
OPTIK
·
2016
·
IF 0.742
Renping Cao,Xiangfeng Ceng,Jijun Huang,Chunyan Cao,Pengjie Tang,Hui Ao,Xiaoguang Yu
Novel Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor is synthesized by high-temperature solid-state reaction method in air. Host Ca 0.2 Zr 0.8 O 1.8 with excitation 310 nm shows deep-blue broadband emission within the range 340–500 nm owing to the Zr 4+ → O 2− transition in [ZrO 8 ] group. Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor with excitation 263 and 394 nm emits reddish-orange light owing to the 5 D 0 → 7 F J ( J = 1, 2, 3, and 4) transitions of Eu 3+ ion, and that with excitation 310 nm shows a systematically varied hue from deep-blue to reddish-orange by changing Eu 3+ ion concentration . Tunable emission and energy transfer are confirmed via spectral properties. The optimal Eu 3+ concentration is ∼5 mol% in Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor and the corresponding fluorescence lifetime is ∼1.994 ms. The luminous mechanism is analyzed and explained by the simplified energy level diagrams of [ZrO 8 ] group and Eu 3+ ion in Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor.
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 LUMINESCENCE
·
2019
·
IF 2.961
Su Zhang,Lingling Lv,Hongjie Wang,Chongyang Zhu,Ran Pang,Jing Feng,Da Li,Guanyu Liu,Lihong Jiang,Chengyu Li
The 0.8CaWO 4 -0.2EuMO 4 (M = Nb, Ta) solid solution and Eu 3+ , Ta 5+ and Nb 5+ single doped CaWO 4 were prepared by a high-temperature solid state reaction technique. Experiments show that the addition of Nb 5+ and Ta 5+ can increase the red luminescence of Eu 3+ in CaWO 4 . In this paper, the composition and structure of solid solution were analyzed by X ray diffraction (XRD), Fourier transform infrared spectrum and Raman spectrum analysis. The luminescence properties of the solid solution were studied by means of stable photoluminescent spectra, diffuse reflectance spectra (DRS), fluorescent decay curves and variable temperature spectra. By combining structural analysis, J-O theoretical calculation and experimental results, we believe that the significant improvement of the emission efficiency comes from the decrease of non-radiation relaxation rate.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2013
·Vol. 20
·期 2
·841-848
·
IF 3.476
Huo Jiansheng,Zheng Yuhui,Pang Shuting,Wang Qianming
In this paper, a novel luminescent hydrogel was successfully prepared by incorporating Tb-HSA (HSA = Human Serum Albumin) complex into cellulose host. The green luminescence intensities of Tb(III) exhibited on – off changes in terms of pH variation. At the same time, europium activated phosphor (GdVO 4 :Eu 3+ ) was immobilized into the cellulose hydrogels through two approaches. The photophysical properties of luminescent gels with the temperature variation were investigated by fluorescence. The new group of soft materials will display task-specific usages in sensing fields.
研究领域:
材料科学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Qiangsheng Gao,Lili Meng,Lixia Zhang,Qi Pang,Lifang Liang
Luminescent materials with the chemical formula Sr 3− x Eu x AlO 4− y N y F were prepared by a solid-state reaction. X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), photoluminescence emission and excitation spectra, the lifetime, the temperature-dependent luminescence, and the effects of Eu 3+ and N 3− concentrations were investigated in detail. Partial substitution of Sr 2+ by Eu 3+ and O 2− by N 3− in Sr 3− x Eu x AlO 4− y N y F contributes to form quadrangular crystals, and enhance the thermal stability against the temperature quenching effect. After the partial replacement of Sr 2+ by Eu 3+ and O 2− by N 3− ions in the Sr 3 AlO 4 F host structure, the emission intensity was enhanced and the charge-transfer band of O 2p →Eu 4f shifted to higher wavelength.
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 MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2526-2534
·
IF 2.993
Zhou Zhan,Wang Zhuosen,Tang Yiping,Zheng Yuhui,Wang Qianming
Bacillus anthracis marker (dipicolinic acid, DPA) is a biological warfare agent. The excessive amounts of the compound would lead to serious problems in human health. It is essential to develop a straightforward and rapid detection technology of DPA. For this reason, an optical sensing platform was established on a robust alginate film. Firstly, green emission CQDs were synthesized via a one-step microwave carbonization method based on citric acid and urea. In the next step, europium ions were employed to chelate the carboxyl groups of CQDs and sodium alginate was selected to assemble the green fluorescent film (CQDs-Eu film). In the presence of DPA, the emission peaks evolved from green to red region. The ratio of I 615 / I 554 linearly increased with the addition of DPA in the range of 1–45 µM with a detection limit as low as 0.17 µM. This CQDs-Eu film-based sensing nanostructure showed its potential applications in the fields of biology and food analysis.
研究领域:
生物传感
·
环境科学
·
光学检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yuhui Zheng,Jiansheng Huo,Jinglian Yang,Jing Hu,Jinwei Gao,Qianming Wang
Uniform and dispersive NaLa(MoO 4 ) 2-x (WO 4 ) x (abbreviated as NLMW): Eu 3+ /Tb 3+ (5 mol%) microspheres were successfully synthesized at low temperature (393 K). The incorporation of Bi 3+ or Mn 2+ into CaMoO 4 : Eu 3+ with tetragonal crystalline phase has also been studied. The structure, morphology, and luminescent properties of these powder samples were examined by means of X-ray diffraction (abbreviated as XRD), scanning electron microscopy (abbreviated as SEM), and fluorescent spectrophotometry, respectively. SEM images substantiated that these phosphors have uniform sphere-shaped morphologies. The samples exhibited the characteristic emission of Eu 3+ ( 5 D 0 → 7 F J )/Tb 3+ ( 5 D 4 → 7 F J ) under ultraviolet excitation. Effects of the ratio of MoO 4 /WO 4 on the luminescence behavior were investigated in detail. The MoO 4 /WO 4 ratio was optimized as 1/1. The international commission on illumination (abbreviated CIE for its French name) chromaticity coordinates of NLMW: Eu 3+ and NLMW: Tb 3+ indicate the emissions were located in the red and green region, which will be beneficial for the potential device fabrication . Encapsulation of Bi 3+ and Mn 2+ both can effectively sensitize europium (III) ions, generating stronger red emissions ( 5 D 0 → 7 F J ).
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）