Ye Sheng

Jilin University, Yung-chi, Jilin Sheng, China

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Publications (60)147.66 Total impact

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    ABSTRACT: 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) demonstrated that Eu3+ activator ions have been effectively 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.
    No preview · Article · Jan 2016 · RSC Advances
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    ABSTRACT: Uniform Lu2(C4H4O6)3·6H2O cauliflower-like microspheres have been synthesized via a direct precipitation method at room temperature, without any templates and catalysts. The solvent-dependent morphological evolution and the formation mechanism of the Lu2(C4H4O6)3·6H2O cauliflower-like microspheres were investigated in detail. Furthermore, Eu3+/Tb3+-doped Lu2O3 inherited their parents' morphology were obtained through a direct annealing process. The Lu2(C4H4O6)3·6H2O:Eu3+, Lu2O3:Eu3+ exhibit strong red emission corresponding to the 5D0-7Fj transition of the Eu3+ ions. The Lu2(C4H4O6)3·6H2O:Tb3+, Lu2O3:Tb3+ exhibit strong green emission corresponding to the 5D4-7Fj transition of the Tb3+ ions under UV light excitation. The samples may have potential applications in the fields, such as light-emitting phosphors, advanced flat panel displays, or biological labeling.
    No preview · Article · Jan 2016 · Journal of Alloys and Compounds
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    ABSTRACT: Lu2O2S:Eu3+ phosphors were successfully prepared with controllable morphology, including 3D sphere-like, cloud-like, nested tetrahedron, flower-like and 1D rod-like architectures. It is indicated that pH value of the system plays an important role in the morphology and the degree of crystallinity of the product. Interestingly, with morphological changes, the band gap energy of Lu2O2S crystal changed, followed by a variation of the crystal field symmetry and further the luminescence performance. Therefore, such a morphology-sensitive luminescence property was first interpreted in terms of degree of crystallinity, band gap energy, and the crystal field symmetry around Eu3+.
    No preview · Article · Jan 2016 · RSC Advances
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    ABSTRACT: CaCO3:xEu3+ (x = 0, 0.010, 0.015, 0.020, and 0.025) cubic nanoparticles were synthesized by carbonation method. The powder XRD patterns and SEM images of the CaCO3:xEu3+ nanoparticles demonstrate that both the crystalline sizes and average particle sizes of synthesized samples decreased with the increase of Eu3+ content until x = 0.020. Kubelka-Munk plots and bandgap energy estimation indicate that the doping of Eu3+ ions changed optical bandgap of CaCO3. Photoluminescence (PL) spectra show that the PL intensity of the CaCO3:xEu3+ nanoparticles was enhanced with the increase of Eu3+ content in cubic CaCO3:xEu3+, and concentration quenching occurred when Eu3+ concentration exceeded 2.0 mol%. In addition, the doped sites of Eu3+ in CaCO3 crystalline were identified by the site-selective spectroscopy and decay curves.
    No preview · Article · Nov 2015 · Materials Science and Engineering B
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    ABSTRACT: Uniformly sized and shaped Eu3+-doped silica nanowires were conventionally fabricated by the microemulsion method accompanied with a sol-gel process for the first time. The products were characterized by different techniques, and their luminescence properties were investigated and compared. The scanning electron microscopy and transmission electron microscopy images demonstrated that the as-synthesized Eu3+-doped silica nanowires were formed in high yield with a smooth surface and a uniform diameter of about 130-150 nm. The results of FTIR spectroscopy, energy-dispersive spectroscopy, and X-ray diffraction showed that the Eu3+ ions were doped into the silica network structure in the form of Si-O-Eu bonds. The effect of the Eu3+ concentration on the luminescent intensity was investigated, and the highest emission intensity was found at the composition of 20 mol-% Eu3+. The obtained Eu3+-doped silica nanowires exhibited characteristic luminescent emission of Eu3+ at λ = 613 nm and apparent concentration quenching above the concentration of 20 mol-% Eu3+. The growth processes of the silica nanowires were explained in detail on the basis of a modified vapor-liquid-solid mechanism.
    No preview · Article · Oct 2015 · European Journal of Inorganic Chemistry
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    ABSTRACT: A series of Ca2Mg0.75Al0.5Si1.75O7:Ln (Ln = Ce3+, Dy3+, Eu3+, Sm3+) phosphors were synthesized by conventional high temperature solid state reaction. Their luminescent properties, color chromaticity and application in UV white LED were investigated. The research showed that the CIE chromatic coordinates of the phosphors are in the blue (Ce3+ doped sample), white (Dy3+doped sample) and red (Eu3+ and Sm3+ doped sample) regions, respectively. Furthermore, blue, red and white light-emitting diode (LED) prototypes were fabricated using as-prepared phosphors and UV chips. In addition, the luminescence efficiency, CIE chromaticity coordinates, correlated color temperature (CCT) and color rendering index (CRI) of these LED prototypes were exhibited. The results indicated that these phosphors were of potential application in UV white LED.
    No preview · Article · Sep 2015 · Journal of Alloys and Compounds
  • Qiang Zhang · Ye Sheng · Keyan Zheng · Haifeng Zou
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    ABSTRACT: This work focuses on the construction of a series of novel chemically bonded inorganic–organic rare earth hybrid materials using 3,4-bis(pyridin-4-ylmethoxy)benzoic acid as an organic bridge molecule that can both coordinate with rare earth ions and form an inorganic network with titanium isopropylate and aluminum isopropylate after cohydrolysis and copolycondensation through a sol–gel process. Measurements of the properties of these materials show that the terbium systems present high thermal stability and amorphous structure features. UV excitation in the organic component resulted in strong green emission from Tb3+ ions due to an efficient ligand-to-metal energy-transfer mechanism. Graphical Abstract
    No preview · Article · Sep 2015 · Journal of Sol-Gel Science and Technology
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    ABSTRACT: Ce3+ and/or Dy3+ activated Ca20Al26Mg3Si3O68 phosphors were synthesized by high temperature solid state reaction and their luminescent properties were studied. There are two emissions peaking at 407 and 577 nm in the emission spectra of Ca20Al26Mg3Si3O68:Ce3+, Dy3+, which are due to the transitions of Ce3+ and Dy3+ ions, respectively. More importantly, the effective energy transfer from Ce3+ to Dy3+ ions has been confirmed and investigated by emission/excitation spectra and luminescent decay behaviors. Furthermore, the energy level scheme and mechanism of energy transfer were investigated and it was demonstrated to be resonant type via dipole-dipole reaction. Under the excitation of 345 nm, the emitting color can change from blue to white by adjusting the relative doping concentration of Ce3+ and Dy3+ ions, indicating that the phosphors Ca20Al26Mg3Si3O68:Ce3+, Dy3+ are promising single-phase white-emitting phosphors for application in pc-white LEDs.
    No preview · Article · Sep 2015 · Journal of Solid State Chemistry
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    ABSTRACT: In this paper, high value-added tri-colour phosphors Ba0.96Mg1.88Si2O7:0.02Eu2+, 0.02Dy3+, 0.12Mn2+; CaSr0.995SiO4:0.005Eu2+ and Ba0.91MgAl10O17:0.09Eu2+ were prepared using the white carbon black (hereinafter referred to as WCB) and alumina extracted from oil shale ash as raw materials. The structure and luminescence properties of the samples were characterized by X-ray diffraction (XRD) and photoluminescent spectra. The results show that the red and green phosphors synthesized by WCB exhibited much weaker emission than the phosphors synthesized by pure chemical reagent silica, which is mainly due to the high content of iron in the WCB. After purifying the WCB under laboratory conditions, the luminescence properties were improved and close to that of pure chemical reagent. By comparing with the emission of the samples synthesized with chemical reagents, the results show that the products extracted from oil shale ash can be applied to synthesize luminescent materials which have potential applications in white-light ultraviolet (UV)-LED field.
    No preview · Article · Sep 2015 · Optical Materials
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    ABSTRACT: SiO2 and Eu3+-doped SiO2 submicron rods were conveniently fabricated via a sol–gel process at room temperature. In this process, citric acid served as a unique structural modifier through hydrolysis of TEOS at alkaline condition to obtain the silica submicron rods. The morphology of the products was sensitive to the conditions, such as stirring, gelation time and the dropping speed of NH4OH. By sampling the products at different reaction times, we discussed the formation and growing mechanism of SiO2:Eu3+ submicron rods in detail. The weak interactions between ammonium citrate crystals and silica species may be the reasons of the rods formation. The obtained silica submicron rods were 5–6 μm in length and 650–750 nm in width and there was no obvious change after doping. Under UV light excitation, the undoped silica submicron rods exhibited blue emission, which may be associated with defect centers in the structures of the products. The Eu3+-doped silica submicron rods exhibited red emission, which was due to the 4f→4f transition of Eu3+. The effect of different doping concentrations of Eu3+ ions on the luminescence was investigated. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), Thermo-gravimetry Analysis (TGA), Scanning electron microscope (SEM), Transmission electron microscope (TEM), Energy-dispersive spectroscopy (EDS) and Photoluminescence spectrum.
    No preview · Article · Aug 2015 · Ceramics International
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    ABSTRACT: A series of Ca2 Mg0.25 Al1.5 Si1.25 O7 :Ce(3+) /Eu(2+) /Tb(3+) phosphors was been prepared via a conventional high temperature solid-state reaction and their luminescence properties were studied. The emission spectra of Ca2 Mg0.25 Al1.5 Si1.25 O7 :Ce(3+) ,Eu(2+) and Ca2 Mg0.25 Al1.5 Si1.25 O7 :Ce(3+) ,Tb(3+) phosphors show not only a band due to Ce(3+) ions (409 nm) but also as a band due to Eu(2+) (520 nm) and Tb(3+) (542 nm) ions. More importantly, the effective energy transfer from Ce(3+) to Eu(2+) and Tb(3+) ions was confirmed and investigated by emission/excitation spectra and luminescent decay behaviors. Furthermore, the energy level scheme and energy transfer mechanism were investigated and were demonstrated to be of resonant type via dipole-dipole (Ce(3+) to Eu(2+) ) and dipole-quadrupole (Ce(3+) to Tb(3+) ) reactions, respectively. Under excitation at 350 nm, the emitting color could be changed from blue to green by adjusting the relative doping concentration of Ce(3+) and Eu(2+) ions as well as Ce(3+) and Tb(3+) ions. The above results indicate that Ca2 Mg0.25 Al1.5 Si1.25 O7 :Ce(3+) ,Eu(2+) /Tb(3+) are promising single-phase blue-to-green phosphors for application in phosphor conversion white-light-emitting diodes. Copyright © 2015 John Wiley & Sons, Ltd. Copyright © 2015 John Wiley & Sons, Ltd.
    No preview · Article · Aug 2015 · Luminescence
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    ABSTRACT: Uniform TiO2:Eu3+ spindlelike nanorods have been successfully prepared by a hydrothermal assisted sol-gel process with ethanediamine (ED) as the shape controller. A possible formation mechanism and luminescent properties were investigated by X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) and kinetic decays. And site-selective spectroscopy was used to research into sites of Eu3+ in TiO2 lattice at 10 K, which identifies that two kinds of sites of Eu3+ in TiO2 nanocrystals, one is located in the distorted lattice sites near the surface, and the other is situated in lattice sites with ordered crystalline environment. Moreover, the luminescence decay curve of products further proved the existence of multiple sites of Eu3+ ions in TiO2 nanocrystals.
    No preview · Article · Jun 2015 · RSC Advances
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    ABSTRACT: Novel organic-inorganic hybrid amorphous thin films were synthesized by linking lanthanide (Tb3+, Eu3+) complexes through 3,4-bis(3-(triethoxysilyl) propylcarbamoyloxy) benzoic acid using sol-gel method. These inorganic-organic hybrids were characterized in detail by Fourier transform infrared spectroscopy, wide angle x-ray diffraction, themogravimetric analysis, scanning electron microscope, and fluorescence spectra. The above research results indicate that the hybrids possess high thermal-stability, amorphous structure features and especially favorable luminescent performances, such as long luminescent decay lifetime, high quantum yield etc.
    No preview · Article · May 2015 · Materials Research Bulletin
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    ABSTRACT: Self-assembled 3D flower-like TiO2:Eu3 + microspheres have been synthesized by a simple hydrothermal method and crystallized by subsequent heat treatments at elevated temperatures. The as-prepared samples are loose and porous with flower-like structure, and the subunits are irregularly shaped nanosheets. A possible growth mechanism is proposed for the 3D flower-like TiO2:Eu3 + microspheres, and it was found that the synergistic effect of citric acid (H3Cit), ethanediamine (En) and hydrofluoric acid (HF) is of crucial importance for the controllable fabrication of TiO2:Eu3 + flower-like hierarchical structures. Furthermore, the calcined flower-like TiO2:Eu3 + hierarchical microspheres exhibit excellent red emission corresponding to the 5D0–7F2 transition of the Eu3 + ions under UV light excitation.
    No preview · Article · Apr 2015 · Powder Technology
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    ABSTRACT: Enhanced red-emitting CaCO3 :Eu3+ phosphors were in situ prepared via carbonization method in the presence of sodium oleate. It has been proved that the introduction of sodium oleate can endow the products with hydrophobic surface, which makes the products own good compatibility with plastics or other polymers. Remarkably, the addition of sodium oleate can also enhance the red emission intensity of CaCO3:Eu3+ phosphors greatly compared to that of the common CaCO3:Eu3+ phosphors. The enhancement is attributed to two functions of sodium oleate. One function is that sodium oleate can avoid OH ligands and/or crystal water molecules attached on the surface of CaCO3 particles; the other function is that Na+ ions can supply effective charge compensation.
    No preview · Article · Apr 2015
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    ABSTRACT: In this paper, a series of novel inorganic/organic rare earth (europium, terbium) hybrid materials through 2-phenylmalonic acid linkage were synthesized by the sol-gel process. The micro-structure and the luminescent properties of the complicated hybrids were studied in detail by Fourier transform infrared spectroscopy, wide angle x-ray diffraction, themogravimetric analysis, scanning electron microscope, and fluorescence spectra. The above research results indicate that the hybrids possess high thermal-stability, amorphous structure features and especially favorable luminescent performances such as long luminescent decay lifetime, and high quantum yield.
    No preview · Article · Apr 2015 · Journal of Non-Crystalline Solids
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    ABSTRACT: SiO2:Eu3+ nanowires were prepared by a solvothermal method followed by subsequent calcination and acid washing processes. The structure, morphology, and properties of the products were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and photoluminescence (PL) spectroscopy. The results indicated that the obtained SiO2:Eu3+ nanowires exhibited red emission under ultraviolet light excitation and may have potential applications in optical and biological areas. In addition, a possible formation process for the SiO2:Eu3+ nanowires is proposed in detail.
    No preview · Article · Mar 2015 · Berichte der deutschen chemischen Gesellschaft
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    ABSTRACT: Gadolinium tartrate (Gd2(C4H4O6)3⋅6H2O) complexes with microrods morphology have been synthesized by direct precipitation in solution at room temperature. The structure of Gd2(C4H4O6)3⋅6H2O was determined by XRD, EDS, FT-IR, and TGA–DSC analysis. The morphology was characterized by SEM method. The solvent-dependent morphological evolution and the formation mechanism of the Gd2(C4H4O6)3⋅6H2O microrods were investigated in detail. Furthermore, the Gd2O3 and Eu3+-doped Gd2O3 microrods, which inherit their parents’ morphology, were obtained through annealing gadolinium tartrate in air. Both Gd2(C4H4O6)3⋅6H2O:Eu3+ and Gd2O3:Eu3+ exhibit strong red emission corresponding to the 5D0 → 7F2 transition of the Eu3+ ions under UV light excitation. This general and facile method may be of significance in the synthesis of many other oxides with one dimensional morphology.
    No preview · Article · Feb 2015 · Journal of Alloys and Compounds
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    ABSTRACT: Eu3+ and Gd3+ ions co-doped amorphous silica nanorods were prepared using a simple sol–gel method, and their luminescent properties were studied under the excitation of ultraviolet light. X-ray diffraction (XRD), Energy-dispersive X-ray (EDX) spectroscopy, Fourier transform infrared spectrum (FT-IR), Scanning electron microscope (SEM), Transmission electron microscopy (TEM), and Photoluminescence (PL) spectra were employed to characterize the products in detail. The nanorods are uniform and their diameters and lengths are in the range of 200–300 nm and 500–700 nm, respectively. Energy transfer process in Gd3+ and Eu3+ co-doped silica, where a ground state of Gd3+, 8S7/2, was selectively excited to a 6IJ state under the excitation of 274 nm, was studied in terms of luminescence spectra, which indict that the energy transfer of Gd3+–Eu3+ is efficient. The mechanism of energy transfer from Gd3+ to Eu3+ is a resonant transfer, in which electric dipole–dipole interaction plays a leading role. Furthermore, the doping concentration-dependence of Eu3+ ions on the energy transfer efficiency was also investigated.
    No preview · Article · Jan 2015 · Journal of Luminescence
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    ABSTRACT: Three dimensional (3D) TiO2 core–shell microspheres were successfully synthesized by a one-step hydrothermal method using ethylenediaminetetraacetic acid (EDTA) as the assistant agent. The sample was characterized by XRD, EDX, SEM, TEM, and BET. The photocatalytic activity of TiO2 core–shell microspheres for the degradation of methyl orange (MO) aqueous solution was measured by UV–vis absorption spectroscopy. The XRD result shows that the TiO2 core–shell microspheres are crystalline without further sintering treatment. Furthermore, the core–shell microspheres exhibit higher photocatalytic activity than that of commercial TiO2 (Degussa P25) for oxidation of MO under UV light irradiation. The enhanced photocatalytic activity is due to the high BET surface area of the sample, which might possess more surface reaction sites and can adsorb and transport more dye molecules.
    No preview · Article · Jan 2015 · Ceramics International