JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shuai Wei,Zhijun Li,Zeyu Lyu,Dashuai Sun,Sida Shen,Jianhui Wang,Chengyu Zhuo,Hongpeng You
In this work, we provide a paradigm how to realize white light emission by utilizing the energy transfer from the Bi 3+ to Eu 3+ ions. First, a novel Bi 3+ activated phosphor set of highly oxygen-deficient perovskite derivatives (Ba 3 YGa 2 O 7.5 , BYGO) were synthesized through the conventional high-temperature solid-state method. The crystal structure was confirmed by Rietveld refinement . Then, Eu 3+ was introduced to the phosphor composition to construct energy transfer pathway with Bi 3+ . The emission color of the BYGO:Bi 3+ ,Eu 3+ phosphors can be changed from cyan to white and orange-red by altering the Bi 3+ /Eu 3+ doping ratio. The energy transfer from the Bi 3+ to Eu 3+ ions was ascribed to dipole-dipole interaction. Finally, a single-component WLED device with a color-rendering index of 84.9 was successfully prepared by employing a near-ultraviolet chip and the BYGO:Bi 3+ ,Eu 3+ phosphors. This work not only indicates that the as-prepared BYGO:Bi 3+ ,Eu 3+ phosphors are a potential candidate for near-ultraviolet WLED, but also demonstrated that energy transfer is an avenue for single-phased white light emission.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Renping Cao,Yunfei Zheng,Ting Chen,Bang Lan,Lan Li,Qinghu Zhong,Shuijing Nie,Jing Wang
In this work, Ca 3 MgSi 2 O 8 :R ( R = Dy 3+ , Eu 3+ , and Eu 3+ /Dy 3+ ) phosphors are synthesized in air by using the high-emperature solid-state reaction method. The crystal phase, crystal structures, lifetimes, and luminescence properties are investigated. Ca 3 MgSi 2 O 8 :Eu 3+ phosphor with excitation at 394 nm emits red-orange light and its emission spectrum covers the region from 575 nm to 720 nm due to the 5 D 0 → 7 F 0 , 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Ca 3 MgSi 2 O 8 :Dy 3+ phosphor under excitation at 350 nm exhibits yellow-green emission with four emission bands in the range of 460–500 nm, 550–600 nm, 650–680 nm, and 740–775 nm, which are attribuited 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, respectively. The energy transfer from Dy 3+ to Eu 3+ ions in Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor can be confirmed by the spectral properties. The tunable emission properties of Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor from yellow-green to red-orange can be fulfilled by the change of the excitation wavelength or the concentration proportion between Dy 3+ and Eu 3+ ions. The luminous mechanism and energy transfer of Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor are explained by the energy level diagrams of Eu 3+ and Dy 3+ ions.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Rui Rui Yang,Pin Wang,Fangrui Cheng,bang lan,Yuxiang Yu,Jing Wang,Shi Ye
It is essential for luminescent materials to be compatible with complex bioenvironments when used for probing biological events. Förster resonance energy transfer (FRET) is a common process in gaining enhanced luminescence signals, in which the interaction between the donor and acceptor plays a decisive role in the optical properties of heterostructured bioprobes. Yet systematic investigations on the gradient amphiphilic and electrostatic interaction effect on luminescence in a complex environment are scarce. Heteronanostructures of Tb(C12H8N2)2(NO3)3 nanocrystals and Eu3+-doped oxide nanosheets in various solutions with varied double electric layers and amphiphilic capacities are chosen for the investigation. It is found that a complex redox process takes place and an interfacial Tb–O bond is formed during preparation of the heteronanostructures. According to the decay dynamics of Tb3+ and Eu3+ emission of the heteronanostructures in various amphiphilic alcohol solvents, the interfacial Tb3+ → Eu3+ energy transfer efficiency apparently displays an extraordinary dependence on alkyl chain length after excluding the refractive index effect, while the zeta potential data suggest that the interfacial electrostatic force on the heteronanostructures should be dominant via the electric double layer in alcohol solvents with short alkyl chain. As the length of alkyl chain increases, the amphiphilic force on the heteronanostructures with amphiphilic Tb(phen)2(NO3)3 and hydrophilic Eu3+-doped nanosheets tends to be overwhelming. These competitive forces strengthen the interaction between Tb3+ and Eu3+ and result in enhancement of the interfacial Tb3+ → Eu3+ energy transfer efficiency. The research helps design potential new bioprobes concerning the interfacial interaction in amphiphilic and salty biosystems.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Jiaqi Wang,Yuanhang Li,Xiaotong Li,Jiangbo Pan,Di Wang,Shuangying Wei,Chengyu Wang,Jian Li
Biological macromolecules had been studied as ligands in recent years, which not only give the complexes excellent polymer properties, but also have many advantages such as biodegradability. Carboxymethyl chitosan (CMCh) is excellent biological macromolecular ligand because of its abundant active amino and carboxyl groups, and it can smoothly transfer energy to Ln 3+ after coordinating. To further study the energy transfer mechanism of CMCh-Ln 3+ complexes, CMCh-Eu 3+ /Tb 3+ complexes with different Eu 3+ /Tb 3+ ratios were prepared by using CMCh as a ligand. The morphology, structure, and properties of CMCh-Eu 3+ /Tb 3+ were characterized and analyzed by infrared spectroscopy, XPS, TG and Judd-Ofelt theory, thus the chemical structure of CMCh-Eu 3+ /Tb 3+ was determined. The mechanism of energy transfer was explained in detail, also the Förster resonance transfer model is confirmed, and the hypothesis of energy transfer back was verified by the characterization and calculation methods of fluorescence spectra, UV spectra, phosphorescence spectra and fluorescence lifetime. Finally, CMCh-Eu 3+ /Tb 3+ with different molar ratios were used to prepare a series of multicolor LED lamps, and it extends the application range of biological macromolecules as ligands.
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PubMed
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OPTICS AND LASER TECHNOLOGY
·
2021
·
IF 3.867
Ziyao Wang,Jiaxiang Huo,Xuezhu Luan,Shineng Sun,Guofeng Ma
In this work, the feasibility of applying Sr 3 P 4 O 13 :Eu 3+ , a micron phosphor, to latent fingerprint visualization was explored and discussed. The preferential occupancy of Eu 3+ in the host lattice was analyzed based on the bond energy method. The excitation-wavelength-dependent luminescence properties of the phosphor were investigated through the photoluminescence emission and excitation spectra . The phosphor could be pumped effectively by deep ultraviolet and near ultraviolet. The luminescent color of the phosphor could be tuned from reddish orange (0.6025, 0.3939) to yellow (0.4729, 0.5031) with the change of excitation wavelength from 254 nm to 394 nm. The multilevel features of the phosphor-attached latent fingerprint could be identified clearly in deep ultraviolet. The high color contrast between ridge and valley lines provided a splendid condition for the observation. Moreover, the effect of the phosphor used on different substrates for latent fingerprint visualization was explored. All the results reveal that the phosphor was a good potential choice for latent fingerprint visualization.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
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IF 2.726
Yanling Shi,Song Ye,Huazhen Liao,Junfang Liu,Deping Wang
Faujasite (FAU) type zeolite is built from sodalite cages that joined by oxygen bridges between the hexagonal faces, and is characteristic of high cation exchange capacity and thermal stability. In this research, the FAU-NaX zeolite with Na/Si/Al molar ratio of 4.08:1.4:1.0 was prepared with template-free hydrothermal method and then confirmed with XRD analysis , based on which a series of Ag + or/and Eu 3+ loaded zeolites were obtained through the ion-exchange procedure. The PL spectra measurement indicated that after heat treatment at optimized temperatures between 400-600 °C, the Ag + loaded zeolites showed strong green visible emission centered around 540–550 nm, which is due to the formation of Ag 3 n+ clusters. Furthermore, efficient energy transfer from silver-clusters to Eu 3+ can be achieved in the Ag + /Eu 3+ loaded zeolites, and the energy transfer efficiency that evaluated with silver-clusters lifetimes are 23.9%, 44.6%, 67.4% and 73.6%, respectively, in ZX-2Eu30Ag, ZX-5Eu30Ag, ZX-10Eu30Ag and ZX-20Eu30Ag. Besides, the XPS measurements implied that the loading of Eu 3+ resulted in a further reduction of silver-clusters, which can also promote the formation of silver-clusters without heat treatment. This new class of metal-clusters and rare earth (RE) ions co-actived phosphors may offer interesting perspective applications in optoelectronics and lighting.
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RSC Advances
·
2019
·Vol. 9
·期 3
·1270-1277
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IF 3.049
Yufeng Zhang,Jie Xiong,Dingyi Shen,Wenpeng Xia,Jie Yu,Yanfei Zhang,Jun Yang,Shanshan Hu,Yuxin Wan,Haili Wen,Hang Ye,Yucan Liu
A series of color-tunable emitting Na3Sc2(PO4)3:Ce3+/Tb3+/Eu3+ (NSPO) phosphors were prepared by a combination of hydrothermal synthesis and low temperature calcination. The phase structure, photoluminescence and energy transfer properties of the samples were studied in detail. The tunable colors were obtained by co-doping the Tb3+ ions into the NSPO:Ce3+ or NSPO:Eu3+ phosphors with varying concentrations. Under UV excitation, the energy transfers from Tb3+ to Eu3+ in the NSPO host occurred mainly via a dipole–dipole mechanism, and the critical distances of the ion pairs (Rc) was calculated to be 17.94 Å by the quenching concentration method. And that, the emission colors of the NSPO:Tb3+,Eu3+ phosphors could be adjusted from green through yellow to red because of the energy transfer from Tb3+ to Eu3+. Based on its good photoluminescence properties and abundant emission colors, the NSPO:Ce3+/Tb3+/Eu3+ phosphors might be promising as potential candidates for solid-state lighting and display fields.
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高影响因子
TALANTA
·
2019
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IF 4.916
Wei Wei,Jiang He,Yingying Wang,Mengjuan Kong
A silicon nanodots (SiNDs)-based ratiometric fluorescent sensor was designed to establish highly sensitive and selective method for detection of tetracyclines (TCs). The sensor comprises the blue fluorescence SiNDs were prepared by hydrothermal method synthesis from (3-aminopropyl)triethoxysilane and low-cost diethylenetriaminepentaacetic acid as the precursor, which serve as co-ligands for covalently bond with europium ions (Eu 3+ ), and also the internal reference signal. In the presence of TCs, the luminescence intensity of Eu 3+ was significantly increased, while the luminescence intensity of SiNDs was reduced. The fluorescence intensity ratio of I 616 /I 450 of the sensor exhibits a sensitive linear range from 0.2 to 20 μM with a detection limit of 3 nM for the detection of TCs. This method was successfully applied to determine the levels of TCs in nature river samples and milk samples with good recoveries ranges from 92.2% to 107.4% and relative standard deviations (RSD, n = 3) was below 5%, providing a promising application future in real samples.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·2235-2243
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IF 3.094
Xiuxia Yang,Lei Zhao,Wei Zeng,Zhichao Liu,Xiaotong Fan,Shuyu Tian,Hao Zhang,Xuhui Xu,Jianbei Qiu,Xue Yu
Fluorescent anti-counterfeiting technologies have become indispensable by virtue of their high concealment properties. In this work, the observation of the characteristic emission originated from Eu 2+ and Eu 3+ ions in CaYAl 3 O 7 realizes a dual-mode anti-counterfeiting strategy. The host matrix provides an environment, where blue and red emission could be manipulated with the introduction of Nd 3+ ions for the reduced occupation of Eu 3+ in the sites of Y 3+ ions. Moreover, the photoluminescence spectra of these samples exhibit time and temperature-dependent dynamic changes thanks to the capture and release of carriers in the reconstructed traps induced by Nd 3+ ions. Herein, a multi-stimuli responsive dynamic and static anti-counterfeiting could be achieved in this work.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Hanzhi Yao,Yuchi Zhang,Yan Xu
Self-calibrated optical luminescent thermometers were prepared based on Eu 3+ /Mn 2+ co-doped Zn 2 GeO 4 phosphors with controllable morphology via a facile hydrothermal synthesis process. The co-doped concentration of Eu 3+ ions in Zn 2 GeO 4 :Mn 2+ played important roles in the evolution of the morphology and the formation of the dual luminescent emission mode. Depending on different excitation wavelengths ranging from 260 to 360 nm, the dual emission centers located at about 534 nm and 612 nm were ascribed to d - d transition derived from 4 T 1 - 6 A 1 of Mn 2+ ions and f - f transition originated from 5 D 0 - 7 F 2 of Eu 3+ ions, respectively, which gave rise to the excellent self-calibrating temperature sensing functions. The related luminescent and sensing mechanism of the Eu 3+ /Mn 2+ co-doped Zn 2 GeO 4 phosphors are also proposed. The as-obtained Eu 3+ /Mn 2+ co-doped Zn 2 GeO 4 phosphors had a high relative sensitivity ( S r ) of 1.96% ºC −1 between 20 and 80 °C, as well as stable reusability, demonstrating its superiority as a ratiometric luminescent thermometer for temperature sensing applications.
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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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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Meiqi Chang,Yanhua Song,Jie Chen,Lei Cui,Zhan Shi,Ye Sheng,Haifeng Zou
A novel multifunctional core–shell, yolk–shell SiO2@TiO2:Eu3+/Sm3+ and hollow TiO2:Eu3+/Sm3+ structures were successfully synthesized. The relationship between morphology/ions doping and multifunctional properties including photoluminescence and photocatalysis has been discussed in detail for the first time using systematic characterization techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), photoluminescence (PL), ultraviolet–visible light (UV-vis) analysis, Fourier transform infrared (FT-IR) spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, and X-ray photoelectron spectroscopy (XPS). Upon ultraviolet (UV) excitation, the products show the characteristic red and orange–red emission lines of Eu3+ and Sm3+, respectively. In addition, Judd–Ofelt intensity parameters (Ω2, Ω4) were used to investigate the symmetry and coordination state of Eu3+ ions in the products with different morphologies. The relative luminescence intensities were in the following order: yolk–shell > core–shell > hollow structure. This phenomenon can be ascribed to the unique yolk–shell configuration, which possesses appropriate interior cavity used for multiple reflections and scattering, allowing for more-efficient utilization of the light. Moreover, compared with yolk–shell and hollow structure, the core–shell spheres exhibit excellent photoactivity for the degradation of MO, because the existence of Ti–O–Si bonds increases the surface acidity of the sample, thereby activating the oxidation reaction. In addition, the electron activation in the TiO2 matrix can be facilitated through intermediate oxygen atoms. Moreover, products doped with different rare-earth (RE3+) ions exhibited distinguishable photocatalytic performance. The surfactant-free method provides a promising route toward the development of multifunctional materials for many applications in photocatalysis and PL.
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