Ye Sheng

Jilin University, Yung-chi, Jilin Sheng, China

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Publications (36)56.96 Total impact

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    ABSTRACT: Gd2(C4H4O6)3⋅6H2O microrods were synthesized by direct precipitation.•Gd2O3 microrods were fabricated through complex conversion method.•This complex-conversion method would provide guidance to design other compounds.
    Journal of Alloys and Compounds 02/2015; 622. · 2.73 Impact Factor
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    ABSTRACT: Eu3+-doped TiO2 nanocrystals with three kinds of morphologies (nanorods, nanoparticles, and submicrospheres) have been successfully fabricated in cetyltrimethylammonium bromide (CTAB)/water/cyclohexane/n-pentanol reverse micelle by hydrothermal method for the first time and their photoluminescence (PL) properties have also been studied. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), FT-IR, and PL spectra were used to characterize the samples. The acidic and alkaline conditions of the microemulsion play an important role in determining the geometric morphologies of the final products. TiO2:Eu3+ with three different morphologies all exist only in anatase phase and show high luminescence intensity without further calcinations, which show its advantages of energy saving. The shape of emission spectra was independent of the morphologies of the products but the luminescence intensity of the TiO2:Eu3+ materials is strongly dependent on their morphology. The results show that TiO2:Eu3+ nanorods possess the strongest luminescence intensity among the three nanostructured samples.
    11/2014;
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    ABSTRACT: Monodisperse solid and core-shell structured TiO2:Eu3+ microspheres have been successfully prepared by a facile one-step hydrothermal method using polyethylene glycol (PEG,MW 20000) as the soft template, titanium tetrabutoxide (TBOT) as the titanium source, and ethanol as the solvent. The XRD patterns show that the direct hydrothermal synthesized products are anatase titanium dioxides. TEM and SEM observations indicate that the amount of ethanol plays an important role in the formation of TiO2:Eu3+ microspheres. Solid TiO2:Eu3+ microspheres were formed under small amounts of ethanol, while core-shell structured ones were formed under large amounts of ethanol. Possible growth mechanisms of both the solid and core-shell structured TiO2:Eu3+ microspheres were also proposed in this paper. In addition, without any further calcination, the direct hydrothermal synthesized solid and core-shell structured TiO2:Eu3+ microspheres show strong red emission corresponding to the 5D0→7F2 transition of the Eu3+ ions under ultraviolet excitation. However, the luminescence intensity of the solid microspheres is much higher than that of the core-shell structured TiO2:Eu3+ microspheres, which might due to the fewer defects and much more effectively doping of Eu3+ ions in the solid microspheres.
    CrystEngComm 08/2014; · 3.88 Impact Factor
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    ABSTRACT: Photoluminescent nanomaterials had emerged as an amazing field in a wide range of applications during the past few decades. In this article, fibrous europium tartrates and photoluminescent silica nanotubes were conveniently synthesized by using sol–gel method, in which europium ions entered silica matrix. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, fourier transform infrared spectra, energy-dispersive X-ray spectroscopy and photoluminescence (PL) spectra analysis were used to characterize the growth, structure, morphology and optical property of the products. The results indicated that europium tartrates nanofibers as a template can transform tetraethylorthosilicate into silica nanotubes effectively. Meanwhile, europium(III) was transferred from the fibers to the tubes successfully. A hard template mechanism was proposed to explain the formation process of europium(III)-doped silica nanotubes. Moreover, different morphologies of silica-based nanomaterials were obtained due to varying NH4OH addition or stirring time. PL spectra from nanofiber and nanotube show a typical emission of europium(III), and 13 % is the quenching concentration of europium(III) in silica matrix for this system. The novel silica nanotubes can be applied potentially in optical and biological areas.
    Journal of Sol-Gel Science and Technology 08/2014; 71(2). · 1.66 Impact Factor
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    ABSTRACT: Monodisperse core–shell structured SiO2@SiO2:Eu3+ microspheres were synthesized in a seeded growth way. The obtained SiO2@SiO2:Eu3+ particles have perfect spherical shape with narrow size distribution. Remarkably, the monodisperse SiO2@SiO2:Eu3+ microspheres exhibit considerably strong photoluminescence (PL) of Eu3+ under the excitation of 393 nm compared with the SiO2:Eu3+ samples with polydispersed or irregular shapes and sizes obtained by base-catalyzed method under the same Eu3+ ions doping concentration.Figure optionsDownload full-size imageDownload high-quality image (74 K)Download as PowerPoint slide
    Optical Materials 08/2014; · 2.08 Impact Factor
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    ABSTRACT: Highly crystalline and uniform TiO2:Eu3+ spindlelike nanorods have been successfully synthesized through a facile hydrothermal route with citric acid (H3Cit) and ethanediamine (en) as the assistant agents for the first time. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and photoluminescence (PL) spectroscopy were utilized to characterize the samples. In the synthetic process, the dosages of ethanediamine and citric acid are important parameters that affect the morphology and size of the final products. A possible formation process of the samples has been proposed in detail. The existence of Eu3+ sites in the TiO2 nanorods was proved by site-selective spectroscopy. Furthermore, the TiO2:Eu3+ spindlelike nanorods exhibit bright red (Eu3+, 5D07F2) luminescence under ultraviolet (UV) excitation; therefore, they may find potential applications in fluorescent lamps and field-emission displays (FEDs).
    Berichte der deutschen chemischen Gesellschaft 06/2014; · 2.94 Impact Factor
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    ABSTRACT: This picture is the illustration for the formation process of the SiO2@Lu2O3:Eu3 + composite microspheres. Well-dispersed and uniform silica cores were used as template, and then a continuous europium-doped lutetium oxide precursor shells were homogeneously coated over the silica spheres template. At last, SiO2@Lu2O3:Eu3 + composite microspheres were obtained by calcinating the corresponding precursors at 800 °C for 2 h in air.
    Powder Technology 05/2014; 258:174–179. · 2.50 Impact Factor
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    ABSTRACT: The cubic and spindle-like CaCO3:Eu3+ particles were in situ prepared using carbonization method. Under UV light excitation, both of them exhibit the strong red emission without any treatment such as sintering. It is easy to note that the relative intensities of the PL peaks are closely related to the matrix's morphology. The spindle-like CaCO3:Eu3+ shows much weaker luminescence than cubic CaCO3:Eu3+ under the same measurement conditions, which is attributed to the different matrix's internal and surface defects.
    Colloids and Surfaces A Physicochemical and Engineering Aspects 04/2014; 447:166–171. · 2.11 Impact Factor
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    ABSTRACT: Photoluminescent nano material has been reported as an intriguing field during the past few decades. In this article, tartaric-templated silica nanotubes were conveniently synthesized by sol–gel method. X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, fourier transform infrared spectra and photoluminescence spectra analysis were employed to characterize the growth, structure, morphology and optical property of the products. It is found that tartaric templates can form spindle/spherical-like aggregates composed of many sheets under static/stirring condition, which lead to the different shapes of silica nanotubes. Then the probable strategies for silica nanotubes templating with tartaric acid were described particularly. Hydrogen-bond interaction, supramolecular interaction and a competition of various effects may be the reasons of the nanotubes formation. Moreover, under ultraviolet light excitation, the silica nanotubes exhibited blue emission and luminescent intensity of the tubes prepared under the static condition is much stronger than the stirring ones, mostly because of more defect centers in the structures obtained under stirring condition.
    Journal of Sol-Gel Science and Technology 11/2013; 68(2). · 1.66 Impact Factor
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    ABSTRACT: Homogeneous and monodisperse Gd2O3:Eu3+ core–shell mirospheres have been successfully synthesized via a solvothermal method with polyvinylpyrrolidone (PVP) as surfactant, followed by a subsequent calcination process. The as-prepared products were characterized by various methods, including X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), scanning electron microscopy (SEM), energy-dispersive spectrometer (EDS), trans-mission electron microscopy (TEM), selected area electron diffraction (SAED), high resolution transmission electron microscopy (HRTEM), and photoluminescence spectra (PL). The results show that the obtained Gd2O3:Eu3+ mirospheres with a core–shell structure are uniform in size and distribution, and they have diameters of ∼350 nm, the core diameters of ∼150 nm, and the shell thicknesses of ∼45 nm. Under ultraviolet (UV) excitation, the corresponding Gd2O3:Eu3+ products exhibit strong red emission corresponding to the 5D07F2 transition of the Eu3+ ions, which might find potential applications in the fields such as light-emitting phosphors, advanced flat panel displays, or biological labeling.
    Journal of Alloys and Compounds 10/2013; 574:310–315. · 2.73 Impact Factor
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    ABSTRACT: Uniform TiO2:Eu3+ nanobelts have been successfully prepared by a simple hydrothermal method without any surfactant, catalyst or template. The as-synthesized products were characterized by X-ray diffraction, transmission electron microscopy and Fourier Transform Infrared Spectrophotometry. X-ray diffraction results demonstrate that all the diffraction peaks of the samples annealed at 500 °C can be well indexed to the pure anatase-phase TiO2. Under ultraviolet excitation, TiO2:Eu3+ nanobelts exhibit red emission corresponding to the 5D0–7F2 transition of the Eu3+ ions, and the photoluminescence intensity is the strongest when calcination temperature is 500 °C. It is expected that the TiO2:Eu3+ nanobelts can be used as novel semiconductor luminescence materials.
    Optics & Laser Technology 07/2013; 49:33–37. · 1.37 Impact Factor
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    ABSTRACT: Ca5(PO4)3Cl straw-like sheaves and microrods were synthesized via a ionic liquids based hydrothermal method. The ionic liquids [Omim]Cl was utilized to introduce a new chloride source. The influences of the ionic liquids amount and reaction time on the final products were investigated in detail. A possible splitting formation mechanism for the interesting architectures has been proposed to interpret the growth process. The optical properties of the Ca5(PO4)3Cl:Ce3+,Tb3+ phosphor with different morphology have been discussed. This ionic liquids based hydrothermal method is a novel and facile route for the synthesis of other apatite phosphors.
    Journal of Nanoparticle Research 01/2013; 15(10). · 2.18 Impact Factor
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    ABSTRACT: TiO2:Eu3+ nanorods and spindle-shaped nanoparticles have been successfully prepared through simple calcination and hydrothermal process respectively using titanate as the precursors. On the basis of X-ray diffraction results, the as-obtained precursors are titanate (H2Ti2O5·H2O), while nanorods and spindle-shaped nanoparticles are pure anatase phase of TiO2. TEM and SEM images show that the as-formed precursor could be transformed from nanotubes into nanorods and spindle-shaped nanoparticles by the calcination and hydrothermal process respectively. Under UV light excitation, both the TiO2:Eu3+ nanorods and spindle-shaped nanoparticles exhibit the strong red emission. In addition, the luminescence intensity of TiO2:Eu3+ nanorods is higher than that of TiO2:Eu3+ spindle-shaped nanoparticles due to the increases of the bandgap of the TiO2 nanorods.
    Materials Research Bulletin. 12/2012; 47(12):4322–4328.
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    ABSTRACT: Uniform TiO2:Eu3+ nanorods and spindle-shaped nanoparticles have been successfully prepared through simple calcination and two-step hydrothermal processes using titanate as the precursor. X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectrophotometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and photoluminescence spectra (PL) were used to characterize these nanoparticles. On the basis of X-ray diffraction result, it can be assumed that the as-obtained precursors have the structure formula of titanate (H2Ti2O5·H2O). The as-formed nanotube precursors could transform to anatase TiO2:Eu3+ from nanotubes to nanorods and spindle-shaped nanoparticles with the calcination and hydrothermal processes. Under UV light excitation, both the TiO2:Eu3+ nanorods and spindle-shaped nanoparticles exhibit the strong red emission corresponding to the 5D0–7F2 transition of the Eu3+ ions. In addition, the luminescence properties of the as-obtained samples are dependent on the defects on the surface, leading to stronger luminescence intensity.
    Powder Technology 09/2012; 228:277–283. · 2.50 Impact Factor
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    ABSTRACT: MSi2O2−δN2+2/3δ:Eu2+ (M = Sr, Ba) phosphors were prepared through a two-step solid state reaction. XRD results reveal that the samples are nitrogen-rich phase. The photoluminescence results show that the MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors can be excited by UV and blue light. The critical concentrations of Eu2+ are 5 mol% and 4 mol% for MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba), respectively. With an increase of the Eu2+-concentration, the emission color of SrSi2O2−δN2+2/3δ:Eu can be tuned from green to yellow. Under the excitation of low voltage electron beams (1–3 kV), the MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors exhibit green and cyan emission, respectively. The emission intensity increases with the increasing of accelerating voltage and filament current. Due to the excellent stability, good CIE chromaticity and high color purity, MSi2O2−δN2+2/3δ:Eu (M = Sr, Ba) phosphors may have potential application in the field emission displays.
    Journal of Alloys and Compounds 02/2012; 513:86–90. · 2.73 Impact Factor
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    ABSTRACT: TiO2:Eu3+ nanorods and nanobelts were successfully prepared through a simple hydrothermal method followed by a subsequent calcination process. On the basis of X-Ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy results, it can be assumed that the precursors have the structural formula of titanate (H2Ti2O5·H2O). The morphologies of the precursors are nanobelts and nanotubes. However, the nanobelts could transform to anatase TiO2 with the same morphology, while the nanotubes modulate from nanotubes to nanorods after an annealing process. Both the TiO2:Eu3+ nanorods and nanobelts exhibit strong red emission corresponding to the 5D0–7F2 transition of the Eu3+ ions under UV light excitation. However, TiO2:Eu3+ nanobelts showed higher emission intensity than that of the nanorods; the reason is that the nanobelts have less defects.
    Journal of Nanoparticle Research 01/2012; 14(6). · 2.18 Impact Factor
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    ABSTRACT: Sodium lanthanide sulfate NaLn(SO4)2·H2O (Ln = Y, La to Yb) nano/microcrystals with multiform morphologies were successfully synthesized by a facile and effective hydrothermal method. The photoluminescence properties of the Ce3+ and Tb3+ single-doped as well as the Ce3+–Tb3+ codoped NaY(SO4)2·H2O microsheaves were characterized. The results reveal that the existence of the Ce3+ ions can dramatically enhance the emission intensity of the Tb3+ ions, due to an efficient energy transfer from the Ce3+ to the Tb3+ ions. The critical energy-transfer distance between the Ce3+ and the Tb3+ ions was calculated by methods of concentration quenching and spectral overlapping. Analysis and calculation reveal that the dipole–quadrupole interaction should be mainly responsible for the energy transfer.
    The Journal of Physical Chemistry C 09/2011; 115(40):19463–19469. · 4.84 Impact Factor
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    ABSTRACT: Nanometer TiO2 thin films doped with different concentration of Tb were prepared by sol–gel method and characterized by X-ray diffraction (XRD), thermogravimetry–differential thermal analysis (TG-DTA), transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. XRD results show preferentially oriented (101) anatase films. TEM image indicates that the TiO2 films consist of TiO2 grains with diameter about 15 nm. Under room temperature, strong visible luminescence of Tb3+ ions due to intra-4f shell transitions are obtained and the PL intensity is found to have a well matching relation with the doping concentration of Tb3+ ions. Concentration quenching of PL occurs when Tb3+ concentration exceeds a certain value (9.2 mol%). Furthermore, the luminescence intensity is improved obviously after co-doping with Gd3+ ions because of the sensitization effects of Gd3+ ions to Tb3+ ions in TiO2 system. The energy transfer mechanism from TiO2 and Gd3+ ions to Tb3+ ions was proposed.
    Thin Solid Films 09/2011; 519(22):7966–7970. · 1.87 Impact Factor
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    ABSTRACT: TiO2 nanotubes doped with Eu3+ ions have been fabricated by a simple hydrothermal process. The formation mechanism of TiO2:Eu3+ nanotubes is proposed in detail. The nanotubes are evolved from the rolling up of the anatase sheets, which was verified by characterizations using the X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscope (SEM). Compared with the TiO2:Eu3+ nanocrystals, TiO2:Eu3+ nanotubes exhibit considerably stronger photoluminescence (PL) under the excitation of 393nm. Furthermore, the PL intensity increases with the increasing of Eu3+ concentration in TiO2 nanotubes, and concentration quenching occurs when Eu3+ concentration exceeds 2.0mol%. In addition, the luminescent lifetime of the TiO2:Eu3+ nanotubes is also examined. It is expected that the TiO2:Eu3+ nanotubes can be used as novel semiconductor luminescence materials.
    Powder Technology - POWDER TECHNOL. 01/2011; 212(2):372-377.
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    ABSTRACT: A soapless emulsion polymerization method was applied to synthesize CaCO3/PMMA spherical composite with different loading of CaCO3. CaCO3 nanoparticles were pretreated with oleic acid after the carbonation process of Ca(OH)2 slurry by CO2, in order to improve the compatibility between the CaCO3 particles and MMA monomer in emulsion system. The results of photon correlation spectroscopy (PCS) showed the particles size of composites were bigger than the pure PMMA. And the size increased with the increase of the content of CaCO3 nanoparticles. TEM images showed that the morphology of the composite microspheres was uniform and CaCO3 nanoparticles can be well encapsulated in the polymeric microsphere, and were located at the edge of the spheres. The results of DTG and TG indicated that the CaCO3 nanoparticles could improve the thermal stability of PMMA. Moreover, capsulation of CaCO3 by PMMA can increase the acid-resistant of CaCO3 nanofillers.
    Colloids and Surfaces A: Physicochemical and Engineering Aspects. 01/2008;