SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Cong Xiang,Jingyi Fang,Yanlin Huang,Zhuo Zheng,Hyo Jin Seo
Eu 3+ is not only a major red-emitting activator, but also an excellent spectral probe ion. This work reports the Eu 3+ -sites and luminescence in the cation-deficient perovskite tungstates, A-site deficient SrLa 2 (Mg 2 W 2 )O 12 [Sr 1/2 □ 1/2 La(MgW)O 6 ] and B-site deficient Sr 2 La 2 (MgW 2 )O 12 [SrLa(Mg 1/2 □ 1/2 W)O 6 ]. The 7 F 0 → 5 D 0 excitation spectra of Eu 3+ activators in two lattices were measured via pulsed dye laser. In SrLa 2 (Mg 2 W 2 )O 12 :Eu 3+ , there is only one 7 F 0 → 5 D 0 transition, which could be related to the Eu 3+ center on La 3+ sites; while, two 7 F 0 → 5 D 0 transitions in Sr 2 La 2 (MgW 2 )O 12 indicate Eu 3+ ions occupy Sr 2+ in addition to La 3+ , resulting in the luminescent centers related to heterovalent substitution defects. The different Eu 3+ sites make two phosphors exhibit different red luminescence properties. SrLa 2 (Mg 2 W 2 )O 12 :Eu 3+ shows higher luminescent efficiency and thermal quenching due to its regular distribution of the activators resulting in lower dispersion losses of the energy transfer. The experimental results show that rare earth ions occupy different crystallographic positions in A -site and B -site deficient perovskite oxides, and this microstructure can be important for the corresponding luminescent properties.
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高影响因子
OPTICAL ENGINEERING
·
2017
·
IF 1.082
Ting Fan,Jiantao Lü,Guoji Li,Yongfa Huang
Polyvinyl pyrrolidone- (PVP) and ethylene glycol- (EG) coated water dispersible mesoporous CaF2:Eu3+,Li+ nanocrystals were synthesized by a simple one-pot hydrothermal method. The role of Li+ ions on the morphology and spectra in the CaF2 nanocrystals have been reported. The synthesized nanocrystals were monodisperse with regular sphere-like shapes and exhibited obvious hollow mesoporous structure. The results from x-ray photoelectron spectroscopy determined the successful incorporation of Eu3+ ions and Li+ ions into the CaF2 host lattice. The excitation and emission intensity of Eu3+ enhanced with Li+ concentration until 7 mol.%. The nanocrystals could disperse in water for more than a month due to the EG and PVP molecules coated over the nanocrystals.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 20
·16452-16460
·
IF 3.289
Jie Chen,Ye Sheng,Xiuqing Zhou,Murad M. A. Abualrejal,Meiqi Chang,Zhan Shi,Haifeng Zou
Luminescent one-dimensional Eu3+ doped SiO2 fibers have been readily prepared by electrospinning method combined with a sol–gel process. In this work, polyvinylpyrrolidone (PVP) as a simple commercial dendrimer not only increased the viscosity of solution but also provided weak hydrogen bonds with silica, which was significant in improving the electrospinability. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the as-obtained samples present fiber-like morphology with uniform size and the diameters of fibers became wider with the increase of Eu3+ concentration, from nanoscale to microscale. The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) indicated that Eu3+ activator ions have been doped into the interstitial sites of SiO2 fibers through the electrostatic interaction, which would reduce the symmetry of SiO2 framework. The photoluminescence (PL) properties include the diffuse reflectance, excitation and emission spectra indicated that the obtained SiO2:Eu3+ fibers exhibited typical Eu3+ (5D0–7FJ) red emission under ultraviolet excitation and the band energy was changed due to the doping of stable Eu3+ activator ions. Meanwhile, the concentration quenching effects and decay kinetics behaviors of SiO2:Eu3+ fibers were investigated and the optimal doping concentration and the longest lifetime were both in the composition of 16 mol% Eu3+. In addition, the energy-dispersive X-ray spectrum (EDS), thermogravimetry differential thermal analysis (TG-DTA) and the formation mechanism were also displayed in order to better understand the work.
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高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Yunjian Wang,Wanying Wu,Xianliang Fu,Mingzhu Liu,Jing Cao,Congying Shao,Shifu Chen
This work explores the phase transition and its impact on photoluminescent properties of metastable scheelite-type, with and without Eu 3+ doped, CdWO 4 nanophosphors. A series of scheelite structure CdWO 4 :xEu 3+ (x = 0, 0.025, 0.05, 0.075, 0.10) samples were synthesized using a simple solvothermal method. The X-ray diffraction results indicate that the prepared samples were single phase in a tetragonal scheelite-type structure, and completely transformed into pure monoclinic wolframite structure after sintering at 450 °C for 2 h. It was revealed by Rietveld analysis that Eu 3+ doping induced a lattice contraction of both scheelite and wolframite CdWO 4 structures. The impact of Eu 3+ doping on the crystal structure and the band structure were further probed by FT-IR, Raman and UV–Vis spectroscopy. SEM images show that the morphology of the prepared samples also changed in the phase transition and the Eu 3+ doping processes. All samples showed a broad multi-color luminescence emission in the range from 400 to 640 nm under 280 nm excitation. The relative intensities of the blue-green emission originated from CdWO 4 matrix and the red emission ascribed to Eu 3+ can be regulated by both the crystal structure and Eu 3+ doping levels. The energy transfer process between WO 4 groups in scheelite structure CdWO 4 and WO 6 groups in wolframite structure CdWO 4 and Eu 3+ was discussed in detail based on the photoluminescent excitation and emission spectra. The synthetic approach reported here allows the control over CdWO 4 polymorphs and this kind of luminescent material has wide applications in white-LED, chemosensors and bioimaging .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoxuan Fan,Lirong Xu,Wen Liu,Feifei Yin,Jianbo Xu,Shuo Cao,Yadan Ding,Xia Hong,Tianya Tan,Kexin Wang,Jiwei Wang
In this work, a Bi 3+ and Eu 3+ co-doped borate oxide LiY 6 (BO 3 ) 3 O 5 (LYBO) phosphor was prepared using high temperature solid-state method. Eu 3+ can be well sensitized by Bi 3+ in the LYBO matrix under 305 nm excitation and produce well-separated emission bands with high intensity. The energy transfer from Bi 3+ to Eu 3+ results in the tunable multicolor emission from LYBO. The maximum energy transfer efficiency can reach 95.93 %. The Bi 3+ and Eu 3+ emissions exhibit the differentiated responses to thermal quenching. The fluorescence intensity ratios between 615 nm and 421 nm show a favorable linear relationship in the range of 123–483 K. It indicates the outstanding optical thermometry performance of LYBO: Bi 3+ , Eu 3+ . The maximum absolute sensitivity (S a ) and relative sensitivity (S r ) are determined to be 0.0087 K -1 and 3.84 % K −1 , respectively. The results exhibit that LYBO: Bi 3+ , Eu 3+ phosphor has a promising application as an optical thermometer in non-contact temperature measurement.
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Journal of Materials Chemistry B
·
2025
·
IF 5.7
Min Zhang,Miao Qiu,Zengkun Li,Rui Xu,Yao Wang,Wei Wang,Christopher D. Snow,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Protein crystals have advantageous properties as framework materials, such as porosity and organized, high-density functional groups with the potential for guest specificity. Thus, protein crystal materials open up vast opportunities for fluorescent species doping and drug sensing. In this work, we explore this frontier by combining two lanthanide complexes with hen egg white lysozyme (HEWL) and directly obtaining co deposited structures in one step using an anti-solvent method different from the previous two-step method. Cross-linking of the protein was achieved using glutaraldehyde, ensuring the stability of the assembly in diverse solvent environments. The use of glutaraldehyde achieved protein cross-linking, ensuring the stability of the components in various solvent environments, including no leakage of fluorescent substances in ultrapure water and anhydrous ethanol. Differential fluorescence quenching effects of amino acids on the two doped luminescent complexes were observed. Introduction of amino acids, varying in concentration and type, resulted in distinct fluorescence enhancement or quenching effects on the protein assembly loaded with the complexes, and the detection results are reflected through different fitting equations and parameters. By exploring the application of this hybrid material for amino acid detection, this work lays the groundwork for broader applications.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Jing Ma,Bing Yan
Both Zeolite A (ZA) and two kinds of 2,2′-bipyridine-5,5′-dicarboxylic acid (H 2 bpydc) linking meta-organic frameworks (MOFs) (MOF-253 (Al(OH)(bpydc)) and UiO-67 ([Zr 6 O 4 (OH) 4 (bpydc) 6 ])) have been used to construct novel photofunctional multi-component lanthanide hybrid materials through covalent-coordination cooperative assembly. Microporous ZA is firstly functionalized by covalently grafting of the surface hydroxyl groups using special silane crosslinking reagent 3-methacryloxypropyltrimethoxysilane (MPTMS). Then the multi-component assembly are realized by coordination interaction between lanthanide ions (Eu 3+ /Tb 3+ ), ZA through the carbonyl group of MPTMS unit and MOF-253 (or UiO-67) through the double nitrogen of bpydc linker. Subsequently, the obtained multicomponent hybrid materials (ZA-MPTMS-Eu/Tb-MOF-253(UiO-67)) are characterized by means of XRD, FT-IR, SEM and especially the photoluminescence properties are studied in details. These hybrids with both ZA and MOFs host show the main characteristic crystal framework morphology of ZA together with the composition of MOFs. They display the feature luminescence of Eu 3+ /Tb 3+ ions for the energy transfer from bpydc linker of MOFs. Furthermore, ZA-MPTMS-Eu-UiO-67 hybrid material is selected to check the luminescence response to volatile substances, whose luminescence quenching is found for ammonia vapor.
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高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Hui Li,Ziyao Wang
Ba 3 Lu 4 O 9 :Dy 3+ ,Eu 3+ phosphors were developed through the conventional solid-state reaction. Luminescent performance including the energy transfer from dysprosium to europium , spectral tunability, fluorescent lifetime and thermal quenching behavior of the as-studied phosphors was studied. The characteristic emission of Dy 3+ and Eu 3+ were detected in Ba 3 Lu 4 O 9 :Dy 3+ ,Eu 3+ upon the excitation at various ultraviolet–visible wavelengths. The critical distance between dysprosium and europium ions was evaluated to be about 16.05 Å. The energy transfer from dysprosium to europium in Ba 3 Lu 4 O 9 can be attributed to the dipole-quadruple mechanism, and the efficiency was evaluated to be 81.8% for Ba 3 Lu 3.52 O 9 :0.16Dy 3+ ,0.32Eu 3+ . The tunable warm-white emission and high thermal stability reveal that the as-studied phosphor can be an auspicious alternative for white LEDs application.
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高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 8
·期 3
·746-757
·
IF 5.958
Bing Yan,Yi Wei,Wei Wang,Meiqian Fu,Guogang Li
Currently, the development of excellent red phosphor materials has attracted much attention in daily lighting, backlit displays, optical thermometry sensors and plant growth fields. However, spectral peak position modulation and bandwidth are still crucial challenges. Herein, we design Eu3+→Mn4+ energy transfer in the Lu3Al5O12 (LuAG) garnet host. On the one hand, photoluminescence tuning from narrow orangish-red emission (593 nm) to narrow deep-red light (668 nm) is successfully obtained, and the energy transfer efficiency reaches 47%. On the other hand, LuAG:Eu3+ exhibits anti-thermal-quenching properties; that is, the peak intensity reaches 166% at 200 °C of the initial intensity at 25 °C. By designing Eu3+→Mn4+ energy transfer, Mn4+ thermal quenching performance is dramatically improved. The photoluminescence peak intensities at 668 nm for LuAG:0.01Mn4+ and LuAG:0.05Eu3+,0.01Mn4+ retain 3.26% and 26% at 200 °C of the original intensity at 25 °C. The corresponding energy transfer mechanism to improve thermal quenching is revealed. According to the fluorescence intensity ratio technique, the maximum values of Sa and Sr for LuAG:0.05Eu3+,0.01Mn4+ are 0.07 K−1 and 0.7% K−1 at 303 K. The temperature sensitivity calculation indicates that LuAG:Eu3+,Mn4+ phosphors can act as promising candidates in optical thermometry sensors. This work provides an insight to achieve narrow red emission modulation and thermal quenching improvement.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingjing Liu,Jing Huang,Meng Lv,Shuguo Wang,Gaoqi chen,Zhihao Zhang,Jiajun Tao,Xu Hou,Xudong Yang,Yu Wang,Shuo Wang,Fei Li,Tong Xu,Yunru Wan,Jiaying Zhao,Xiangyu Gong
RE 3+ -activated BaGdF 5 phosphors have broad applications in LED-based fluorescence displays and biological tracing. In this research, various types (GdF 3 :5%Eu 3+ , BaGdF 5 :5%Eu 3+ ) and different morphologies (peanut, octahedron, microsphere) of gadolinium-based fluoride micro/nano-materials with down-shifting luminescence were synthesized via the hydrothermal method. The coordination environments of Gd 3+ , Eu 3+ , Ba 2+ , and F - ions were tuned by systematically varying the reaction time (6–36 h), the initial pH (3–11), and surfactants/chelating agents (CTAB, EDTA-2Na, Na 3 Cit and PVP). The optimal synthesis conditions (36 h, pH=3) were identified through X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The samples were comprehensively characterized using thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET) surface area measurements, Fourier-transform infrared (FT-IR) spectroscopy, and photoluminescence (PL) spectroscopy. The octahedral BaGdF 5 :5%Eu 3+ particles synthesized with CTAB demonstrated good thermal stability and the strongest fluorescence emission intensity at 595 nm, producing an orange-red light with CIE chromaticity coordinates of (0.5141, 0.4845). The luminescence intensity was 2.23 times greater than that of samples prepared with PVP. Moreover, the signal intensity in MRI T 1 -weighted imaging exhibits a positive correlation with Gd 3+ concentration. The composite material containing 2% wt% BaGdF 5 :5% Eu 3+ within the chitin matrix demonstrated optimal performance in CT imaging. Research indicates that the synthesised octahedral BaGdF 5 :5% Eu 3+ compound holds potential applications for down-shifting luminescence and multimodal MRI/CT imaging.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 4
·1-7
·
IF 1.81
Cao Renping,Shao Wenhua,Zhao Yanshu,Chen Ting,Ao Hui,Guo Siling,Liu Pan,Fan Ting
CaTi 4 (PO 4 ) 6 : x Eu 3+ phosphors are successfully synthesized under air condition by high-temperature solid-state method. The crystal structure, morphology, energy spectrum, atomic percentage, elemental mapping, and luminescence properties are investigated, respectively. Monitored at 594 nm, the excitation spectral bands of CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor in the range of 210–550 nm are assigned to the O 2− –Eu 3+ charge transfer band (CTB) and the 7 F 0 → 5 H 3 , 5 L 7 , 5 L 6 , 5 D 1 , 5 D 2 , 5 D 3 , and 5 D 4 transitions of Eu 3+ ion. With excitation at 394 nm, CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor emits orange-red light with the chromaticity coordinates (0.548, 452), and the emission spectral bands in the region from 575 to 720 nm are attributed to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. The optimal doping concentration of Eu 3+ ion is ~ 8 mol%. The lifetime of CaTi 4 (PO 4 ) 6 :Eu 3+ phosphors decreases from 1.87 to 0.97 ms with increasing Eu 3+ concentrations from 1 to 10 mol%. CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor has a good thermal stability. The experimental results indicate that CaTi 4 (PO 4 ) 6 :Eu 3+ phosphor has an application prospect in white light-emitting diodes (LEDs) based on the near ultraviolet (~ 394 nm) LED chip.
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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.
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危险品化学品经营许可证（带存储）