Ye Sheng

Jilin University, Yung-chi, Jilin Sheng, China

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Publications (50)107.62 Total impact

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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.
    Journal of Alloys and Compounds 09/2015; 644. DOI:10.1016/j.jallcom.2015.04.192 · 2.73 Impact Factor
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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.
    Ceramics International 08/2015; 41(7). DOI:10.1016/j.ceramint.2015.03.063 · 2.09 Impact Factor
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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.
    Materials Research Bulletin 05/2015; DOI:10.1016/j.materresbull.2015.04.057 · 1.97 Impact Factor
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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.
    Powder Technology 04/2015; 274. DOI:10.1016/j.powtec.2015.01.024 · 2.27 Impact Factor
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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.
    04/2015; 3(20). DOI:10.1039/C5TC00681C
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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.
    Journal of Non-Crystalline Solids 04/2015; 413:34-38. DOI:10.1016/j.jnoncrysol.2015.01.020 · 1.72 Impact Factor
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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.
    Berichte der deutschen chemischen Gesellschaft 03/2015; DOI:10.1002/ejic.201403204
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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. DOI:10.1016/j.jallcom.2014.10.032 · 2.73 Impact Factor
  • Journal of Luminescence 01/2015; 158. DOI:10.1016/j.jlumin.2014.10.012 · 2.37 Impact Factor
  • Ceramics International 01/2015; 41(1):247-252. DOI:10.1016/j.ceramint.2014.08.065 · 2.09 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.
    Optical Materials 11/2014; 38. DOI:10.1016/j.optmat.2014.10.026 · 2.08 Impact Factor
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    ABSTRACT: TiO2:Eu3+ submicrospheres have been successfully synthesized by a facile one-pot hydrothermal process using Ti(SO4)2 as Ti resource, d-fructose as the capping agent, and urea as the precipitation agent. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric and differential thermal analysis (TG/DTA), and photoluminescence spectra (PL) were performed to characterize the samples. The results show that TiO2:Eu3+ submicrospheres are assembled by primary nanocrystals with diameters of about 5 nm. The possible formation mechanism for TiO2:Eu3+ submicrospheres has been proposed on a hydrogen bond induced self-assembly process. Under ultraviolet excitation (λex=394 nm), these obtained TiO2:Eu3+ submicrospheres exhibit strong red emission corresponding to the 5D0→7F2 transition of Eu3+ ions.
    Ceramics International 09/2014; 40(8):12993-12997. DOI:10.1016/j.ceramint.2014.04.162 · 2.09 Impact Factor
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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; 16(39). DOI:10.1039/C4CE01048E · 3.86 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; DOI:10.1016/j.optmat.2014.07.025 · 2.08 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). DOI:10.1007/s10971-014-3368-7 · 1.55 Impact Factor
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    ABSTRACT: Novel 3D Lu2O2S:Eu3+ microstructures were successfully synthesized by a simple and effective solvothermal method followed by a subsequent calcination process. The X-ray diffraction (XRD) analysis reveals that the precursors have been thoroughly transformed into lutetium oxysulfide with high crystallinity after calcination at 800 °C. The field scanning electron microscope (FE-SEM) images show that the products are uniform and their morphologies are novel, just like two intertwined tetrahedrons slotted into each other. Furthermore, the obtained 3D Lu2O2S:Eu3+ architectures show strong red emission corresponding to the 5D0→7F2 transition of the Eu3+ ions under ultraviolet (UV) excitation.
    Materials Letters 08/2014; 128:256-258. DOI:10.1016/j.matlet.2014.04.146 · 2.27 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 07/2014; 2014(21). DOI:10.1002/ejic.201402062
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    ABSTRACT: Highly monodispersed SiO2@Lu2O3:Eu3+ core-shell microspheres were successfully synthesized by coating the Lu2O3:Eu3+ nanopartides onto the surface of non-aggregated spherical SiO2 particles via a simple solvothermal method, followed by a subsequent calcination process. The as-prepared phosphors were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), thermal analysis (TGA-DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDS), selected area electron diffraction (SAED), high resolution transmission electron microscopy (HRTEM), and photoluminescence spectra (PL). The as-obtained core-shell microspheres show strong red emission corresponding to the D-5(0) -> F-7(2) transition of the Eu3+ ions under ultraviolet (UV) excitation, which may have potential applications in light-emitting phosphors, field emission displays, advanced flat panel displays and biological labeling.
    Powder Technology 05/2014; 258:174–179. DOI:10.1016/j.powtec.2014.03.035 · 2.27 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. DOI:10.1016/j.colsurfa.2013.12.078 · 2.35 Impact Factor
  • Powder Technology 03/2014; 254:579-582. DOI:10.1016/j.powtec.2014.01.078 · 2.27 Impact Factor