Jun Lin

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (341)1189.35 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Eu3+ and/or Tb3+-doped CaGdAlO4 phosphor samples were synthesized via conventional high temperature solid-state reaction process. X-Ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL) as well as cathodoluminescence (CL) spectra were used to characterize the samples. For CaGdAlO4:Tb3+, the concentration of doped Tb3+ has a significant effect on the 5D3/5D4 emission intensity due to the dipole–dipole cross-relaxation mechanism from 5D3 to 5D4. Under the 4f8 → 4f75d excitation of Tb3+ or low-voltage electron beams excitation, the CaGdAlO4:Tb3+ samples show tunable luminescence from blue to cyan, then to green with the variation of Tb3+-doping concentration. For CaGdAlO4:Eu3+, the samples exhibit a reddish-orange emission corresponding to 5D0,1 → 7F0,1,2,3 transitions of Eu3+. Energy transfer can take place from Tb3+ to Eu3+ when they are codoped in one host. Furthermore, for CaGdAlO4: Tb3+/Eu3+, a white emission can be realized in the single phase CaGdAlO4 host by reasonably adjusting the doping concentrations of Tb3+ and Eu3+ under low-voltage electron beams excitation. Due to the excellent PL, CL properties and good CIE chromaticity coordinates, the as-prepared Tb3+/Eu3+-doped CaGdAlO4 nanocrystalline phosphors have potential application in field emission display devices.
    J. Mater. Chem. C. 10/2014;
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    ABSTRACT: Nanoparticles have been explored as non-viral gene carriers for years because of the simplicity of surface modification and lack of immune response. Lanthanide-based up-conversion nanoparticles (UCNPs) are becoming attractive candidates for biomedical applications in virtue of their unique optical properties and multi-modality imaging ability. Here, we report a UCNPs-based structure with polyethylenimine coating for both efficient gene transfection and tri-modality imaging. Cytotoxicity tests demonstrated that the nanoparticles exhibited significantly decreased cytotoxicity compared to polyethylenimine polymer. Further, in vitro studies revealed that the gene carriers are able to transfer the enhanced green fluorescence protein (EGFP) plasmid DNA into Hela cells in higher transfection efficiency than PEI. Gene silencing was also examined by delivering bcl-2 siRNA into Hela cells, resulting in significant down-regulation of target bcl-2 mRNA. More importantly, we demonstrated the feasibility of up-conversion gene carriers to serve as effective contrast agents for MRI/CT/UCL tri-modality imaging both in vitro and in vivo. The facile fabrication process, great biocompatibility, enhanced gene transfection efficiency and great bioimaging ability can make it promising for application in gene therapy.
    Langmuir : the ACS journal of surfaces and colloids. 10/2014;
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    ABSTRACT: We report a simple and easy method to fabricate silica nanotubes (SNTs) with multicolor upconversion luminescence by single-nozzle electrospinning based on phase separation effect without any templates. Multicolor upconversion nanocrystals (NCs) were firstly synthesized in a similar hydrothermal route. Then the water solution containing NCs were added slowly into electrospinning precursor solution drop by drop. After electrospinning process and calcination at 600 oC, the pure SNTs with NCs uniformly dispersed on them were obtained. The as-produced up-conversion (UC) luminescent SNTs were used as an adsorbent for removal of colorful dye from aqueous solutions. Adsorption experiments indicated that the SNTs have good adsorption capacity and the adsorption amount can be traced by two indicators, the decrease of UV adsorption of the solutions as well as the altering of UC intensity of the SNTs. More importantly, the UC-SNTs adsorbents are piece-like and could be effectively and quickly separated via filtration or centrifugation. Furthermore, the SNTs can regenerate by calcination and remain almost the same absorption capability for recycling use. Considering with cost, function and cyclic utilization, UCNPs decorated SNTs may create a new platform for preconcentration and separation of color pollutants from waste water.
    Dalton Transactions 08/2014; · 3.81 Impact Factor
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    ABSTRACT: Uniform Na5Lu9F32 hollow mesoporous spheres (HMSs) have been successfully prepared by a facile and mild (50 °C for 5 h) co-precipitation process, and Au nanocrystals (NCs) with particle size of about 10 nm were conjugated to polyetherimide (PEI) modified HMSs by electrostatic interaction. Compared with Na5Lu9F32:Yb/Er HMSs, the up-conversion (UC) luminescence intensity of Na5Lu9F32:Yb/Er@Au HMSs was much higher under low pump power due to the local field enhancement (LFE) of Au NCs, and there is a surface plasmon resonance (SPR) effect with non-radiative transitions which generates a thermal effect. These two effects have been proved by theoretical discrete-dipole approximation (DDA) simulation. The good biocompatibility of Na5Lu9F32:Yb/Er@Au HMSs indicates their promising candidate as biological field. Particularly, under near-infrared (NIR) laser irradiation, a rapid doxorubicin (DOX) release was achieved due to the thermal effect of Au NCs. In this case, Na5Lu9F32:Yb/Er@Au HMSs exhibit an apparent NIR light controlled "on/off" drug release pattern. In addition, UC luminescent images uptaken by cells show brighter green and red emission under NIR laser excitation. Therefore, this novel multifunctional (mesoporous, enhanced UC luminescent, and light-triggered drug release) material should be potential as a suitable targeted cancer therapy carrier and bio-imaging.
    ACS Applied Materials & Interfaces 08/2014; · 5.90 Impact Factor
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    ABSTRACT: ZnGa2O4 and ZnGa2O4: Mn2+/Eu3+ with uniform nanosphere (diameter about 400 nm) morphology have been synthesized via a facile hydrothermal approach. XRD, Raman spectra, XPS, FT-IR, SEM, TEM, photoluminescence (PL), and cathodoluminescecne (CL) spectra are used to characterize the resulting samples. The controlled experiments indicate the dosage of trisodium citrate and pH values are responsible for shape determination of the ZnGa2O4 products. The possible fast crystallization–dissolution–recrystallization formation mechanism for these nanospheres is presented. Under UV light and low-voltage electron beam excitation, ZnGa2O4, ZnGa2O4: Mn2+ and ZnGa2O4: Eu3+ emit bright blue, green, and red luminescence, respectively. Based on density functional theory calculations from first principles, the green and red emission are caused by the Mn 3d and Eu 4f electronic structures, respectively. Besides, the dependence of the CL intensity on the calcination temperature and electrical conductivity of the samples is presented. The ZnGa2O4: Mn2+ nanospheres have a higher CL intensity than that of bulk samples under the same excitation condition. The realization of three primary colors from a single host material suggests that full color display based on ZnGa2O4 nanospheres might be achievable, showing that these materials have potential applications in lighting and display fields.
    Advanced Functional Materials 08/2014; · 10.44 Impact Factor
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    ABSTRACT: Oil-dispersible monodispersed NaCeF4, NaCeF4:Tb(3+) and NaCeF4:Yb(3+) nanoparticles were prepared through a thermal decomposition method. Phase purity, morphology and luminescence properties were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM), and photoluminescence (PL) spectra, respectively. The starting amount of NaF is crucial for phase purity, and the reaction time had an effect on the morphology of the products. Products with rectangles, rods, and their mixtures could be obtained at different reaction times. Under UV excitation, energy transfer from Ce(3+) to lanthanide ions Tb(3+) and Yb(3+) could be observed in both NaCeF4:Tb(3+) and NaCeF4:Yb(3+). Energy transfer from Ce(3+) to Tb(3+) was proposed to be of a resonant type (ET) by luminescent dynamic studies with a theoretically calculated efficiency of up to 93%. Energy transfer from Ce(3+) to Yb(3+) was demonstrated to be a cooperative (CET) process, and the CET efficiency and total theoretical quantum efficiency were found to be 79% and 158%, respectively.
    Nanoscale 07/2014; · 6.73 Impact Factor
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    ABSTRACT: Lanthanide ion (Ln(3+))-based upconversion nano/micromaterials that emit higher-energy visible light when excited by low-energy NIR light have aroused considerable attention in the forefront of materials science and biomedical fields, which stems from their unique optical and chemical properties including minimum photodamage to living organisms, low autofluorescence, high signal-to-noise ratio and detection sensitivity, and high penetration depth in biological or environmental samples. Thus, Ln(3+)-based upconversion materials are rising new stars and are quickly emerging as potential candidates to revolutionize novel biomedical applications. In this review article, we mainly focus on the recent progress in various chemical syntheses of Ln(3+)-based upconversion nanomaterials, with special emphasis on their application in stimuli-response controlled drug release and subsequent therapy. Functional groups that are introduced into the stimuli-responsive system can respond to external triggers, such as pH, temperature, light, and even magnetic fields, which can regulate the movement of the pharmaceutical cargo and release the drug at a desired time and in a desired area. This is crucial to boost drug efficacy in cancer treatment while minimizing the side effects of cytotoxic drugs. Many multifunctional (magnetic/upconversion luminescence and porous) composite materials based on Ln(3+) have been designed for controlled drug delivery and multimodal bioimaging. Finally, the challenges and future opportunities for Ln(3+)-based upconversion materials are discussed.
    Chemical Society Reviews 07/2014; · 24.89 Impact Factor
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    ABSTRACT: The influence of Mg(2+)-Si(4+)/Ge(4+) incorporation into Ce(3+)-doped Y3Al5O12 garnet phosphors on the crystal structure and luminescence properties is described in this work. X-ray diffraction with Rietveld refinements, photoluminescence spectra, absolute quantum yield, thermal quenching behavior, and lifetimes were utilized to characterize samples. The introduction of Mg(2+)-Si(4+)/Ge(4+) leads to an obvious red shift of emission wavelength under the excitation of blue light, especially for the series of Mg(2+)-Si(4+) substitutions, which is suited for white light-emitting diodes (LEDs) with low color temperatures and good color rendering using only a single phosphor. More interestingly, an additional emission band locating at high-energy was observed with ultraviolet excitation, which is different than previous literature. Under the excitation of ultraviolet, the emission color for the Mg(2+)-Si(4+) substitutions can be tuned from yellow-green to blue, which is expected to obtain single-phased phosphors with white emission excited with UV-LED chip. The usual Ce(3+) emission band at low energy has stronger quenching at high temperatures. The mechanisms for the observed phenomena are discussed.
    Inorganic chemistry. 06/2014;
  • Guogang Li, Jun Lin
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    ABSTRACT: Nowadays there are several technologies used for flat panel displays (FPDs) and the development of FPDs with enhanced energy efficiency and improved display quality is strongly required. Field emission displays (FEDs) have been considered as one of the most promising next generation flat panel display technologies due to their excellent display performance and low energy consumption. For the development of FEDs, phosphors are irreplaceable components. In the past decade, the study of highly efficient low-voltage cathodoluminescent materials, namely FED phosphors, has become the focus of enhancing energy efficiency and realizing high-quality displays. This review summaries the recent progress in the chemical synthesis and improvement of novel, rare-earth and transition metal ions activated inorganic cathodoluminescent materials in powder and thin film forms. The discussion is focused on the modification of morphology, size, surface, composition and conductivity of phosphors and the corresponding effects on their cathodoluminescent properties. Special emphases are given to the selection of host and luminescent centers, the adjustment of emission colors through doping concentration optimization, energy transfer and mono- or co-doping activator ions, the improvement of chromaticity, color stability and color gamut as well as the saturation behavior and the degradation behavior of phosphors under the excitation of a low-voltage electron beam. Finally, the research prospects and future directions of FED phosphors are discussed with recommendations to facilitate the further study of new and highly efficient low-voltage cathodoluminescent materials.
    Chemical Society Reviews 06/2014; · 24.89 Impact Factor
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    ABSTRACT: Gd(3+) -aggregated gold nanoclusters (AuNCs) encapsulated by silica shell (Gd(3+) -A-AuNCs@SiO2 NPs) were strategically designed and prepared. The as-prepared nanoparticles exhibit aggregation-enhanced fluorescence (AEF), with an intensity that is up to 3.8 times that of discrete AuNCs. The clusters served as novel nanoprobes for in vitro and in vivo multimodal (fluorescence, magnetic resonance, and computed X-ray tomography) cancer imaging.
    Chemistry 06/2014; · 5.83 Impact Factor
  • Langmuir : the ACS journal of surfaces and colloids. 06/2014;
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    ABSTRACT: A series of β-Na2Ca4(PO4)2(SiO4) (β-NCPS):A (A = Eu(2+), Dy(3+), Ce(3+)/Tb(3+)) phosphors were prepared via a high-temperature solid-state reaction route. The X-ray diffraction, Fourier transform infrared, photoluminescence (PL), cathodoluminescence (CL) properties, fluorescent lifetimes, and absolute quantum yield were exploited to characterize the samples. Under UV radiation, the β-NCPS:Eu(2+) phosphors present bright green emissions, and the β-NCPS:Ce(3+) phosphors show strong blue emissions, which are attributed to their 4f(6)5d(1) → 4f(7) and 5d-4f allowed transitions, respectively. The β-NCPS:Ce(3+), Tb(3+) phosphors display intense tunable color from blue to green and high absolute quantum yields (81% for β-NCPS:0.12Ce(3+) and 83% for β-NCPS:0.12Ce(3+), 0.08Tb(3+)) when excited at 365 nm. Simultaneously, the energy transfer from Ce(3+) to Tb(3+) ions is deduced from the spectral overlap between Ce(3+) emission and Tb(3+) excitation spectra and demonstrated by the change of emission spectra and decay lifetimes. Moreover, the energy-transfer mechanism from Ce(3+) to Tb(3+) ions is confirmed to be exchange interaction according to the discussion of expression from Dexter and Reisfeld. Under a low-voltage electron-beam excitation, the β-NCPS:A (A = Eu(2+), Dy(3+), Ce(3+)/Tb(3+)) phosphors exhibit their characteristic emissions, and the emission profiles of β-NCPS:Ce(3+),Tb(3+) phosphors are obviously different from those of the PL spectra; this difference might be ascribed to their different luminescence mechanisms. These results in PL and CL properties suggest that β-NCPS:A (A = Eu(2+), Dy(3+), Ce(3+)/Tb(3+)) phosphors are potential candidates for solid-state lighting and field-emission displays.
    Inorganic chemistry. 06/2014;
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    ABSTRACT: In this paper, well defined GdOF:Yb3+/Er3+, Tm3+, Ho3+ nano/submicrocrystals with multiform morphologies were prepared via the urea-based precipitation method without using any surfactants. The morphologies of the GdOF products, including spindles and spheres with different sizes (30–550 nm), could be easily modulated by changing the fluorine sources, and the possible formation mechanism has been presented. XRD, FT-IR, SEM, TEM, as well as up-conversion (UC) photoluminescence spectra were used to characterize the prepared samples. Under 980 nm NIR excitation, the relative emission intensities and emission colors of Yb3+/Er3+, Yb3+/Tm3+ and Yb3+/Ho3+ doped GdOF could be precisely adjusted over a wide range by tuning the Yb3+ doping concentration. The strategies for color tuning of UC emission proposed in the current system may be helpful to achieve efficient multicolor luminescence under 980 nm laser excitation. In addition, the corresponding UC mechanisms in the co-doping GdOF systems were analyzed in detail based on the emission spectra and the plot of luminescence intensity to pump power.
    Physical Chemistry Chemical Physics 05/2014; 16(22). · 4.20 Impact Factor
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    ABSTRACT: Lanthanide oxyfluorides LnOF (Ln = Y, La, Pr-Tm) nano/micro-materials with a variety of well-defined morphologies including nanorods, nanospindles, nanorod-bundles and nanospheres, have been successfully synthesized via a facile precipitation technique followed by a heating treatment. It is found that the pH values, fluoride sources and dosage of urea in the initial reaction systems play critical roles in the morphology determination of the LnOF products and the possible formation mechanism for these diverse architectures has been presented. XRD, FT-IR, TG-DTA, SEM, TEM, as well as up-conversion (UC) luminescence spectra are used to characterize the synthesized samples. Under 980 nm NIR laser excitation, red, green and blue UC luminescence are observed from Yb(3+)/Er(3+), Yb(3+)/Ho(3+) and Yb(3+)/Tm(3+) co-doped YOF nanospheres. The MTT assay indicates that YOF nanospheres exhibit good biocompatibility. Especially, the emission spectrum of YOF: 0.20Yb(3+), 0.04Er(3+) nanospheres is dominated by a single red emission at 660 nm, which falls into the "optical window" of biological tissues. The application of YOF: 0.20Yb(3+), 0.04Er(3+) nanospheres in the cell imaging is also investigated, which shows a bright-red emission without background noise.
    Nanoscale 05/2014; · 6.73 Impact Factor
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    ABSTRACT: Eu2+-, Mn2+-activated Ca9Mg(PO4)6F2 (CMPF) phosphors with blue to yellow color-tunable emission properties have been synthesized via high-temperature solid-state reaction method. The crystal structure of Ca9Mg(PO4)6F2 has been identified by Rietveld refinement. The different crystallographic sites of Eu2+ in CMPF:Eu2+ phosphors have been confirmed by virtue of their fluorescence decay lifetimes. The Eu2+-activated CMPF phosphors exhibit broad excitation spectra from 200 to 420 nm (which matches well with the UV-based LED chips) and emission spectra from 380 to 580 nm centered at 454 nm. Energy transfer from Eu2+ to Mn2+ ions in Eu2+, Mn2+codoped CMPF samples is possible because of the spectral overlap between Eu2+ emission and Mn2+ excitation spectra, and the constant fall of fluorescence decay lifetimes of Eu2+ ion with increasing Mn2+ concentration demonstrates the occurrence of it, which provides the color-tunable emission from blue to yellow through adjusting Mn2+ concentration. The energy transfer mechanism between Eu2+ and Mn2+ ions is verified to be electric dipole–quadrupole interaction by analyzing the experimental results. The critical distance between them calculated by concentration quenching (14.57 Å) and spectral overlap methods (14.90 Å) are consistent, which testifies the energy transfer mechanism above from Eu2+ to Mn2+ is appropriate. These results show CMPF:Eu2+, Mn2+ phosphors could be anticipated for UV-pumped white-light-emitting diodes (wLEDs).
    The Journal of Physical Chemistry C. 05/2014; 118(20):11026–11034.
  • ChemInform 05/2014; 45(18).
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    ABSTRACT: In this paper, well defined GdOF:Yb(3+)/Er(3+), Tm(3+), Ho(3+) nano/submicrocrystals with multiform morphologies were prepared via the urea-based precipitation method without using any surfactants. The morphologies of the GdOF products, including spindles and spheres with different sizes (30-550 nm), could be easily modulated by changing the fluorine sources, and the possible formation mechanism has been presented. XRD, FT-IR, SEM, TEM, as well as up-conversion (UC) photoluminescence spectra were used to characterize the prepared samples. Under 980 nm NIR excitation, the relative emission intensities and emission colors of Yb(3+)/Er(3+), Yb(3+)/Tm(3+) and Yb(3+)/Ho(3+) doped GdOF could be precisely adjusted over a wide range by tuning the Yb(3+) doping concentration. The strategies for color tuning of UC emission proposed in the current system may be helpful to achieve efficient multicolor luminescence under 980 nm laser excitation. In addition, the corresponding UC mechanisms in the co-doping GdOF systems were analyzed in detail based on the emission spectra and the plot of luminescence intensity to pump power.
    Physical Chemistry Chemical Physics 04/2014; · 4.20 Impact Factor
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    ABSTRACT: Ce3+-, Tb3+-, and Dy3+-activated Y4Si2N2O7 phosphors have been prepared by the Pechini-type sol–gel method followed by ammonolysis of the precursors. The phase purity, morphology, crystallization condition, chemical composition, and thermal stability of the products have been studied carefully by X-ray diffraction (XRD), energy-dispersive X-ray (EDX), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), fourier-transform infrared (FTIR), and thermogravimetry analysis (TGA) techniques. The photoluminescence (PL) and cathodoluminescence (CL) properties of Ce3+-, Tb3+-, and Dy3+-doped Y4Si2N2O7 phosphors were also investigated. The electronic structure of Y4Si2N2O7 has been investigated by density-functional theory methods. The calculations revealed that the nitrogen atom contributes more excited electrons than the O atom. The band gap has been calculated through the reflection spectrum of the Y4Si2N2O7 host. For Ce3+/Tb3+/Dy3+ singly doped Y4Si2N2O7 products, the phosphors give the typical emissions of the activators. The energy transfers from Ce3+ to Tb3+ and Dy3+ ions have been found and demonstrated through the PL spectra and luminescence decay times. The emission color of Y4Si2N2O7:Ce3+, Tb3+ and Y4Si2N2O7:Ce3+, Dy3+ samples can be tuned by energy transfer processes. Additionally, the temperature-dependent PL properties and the degradation property of CL under continuous electron bombardment of the as-synthesized phosphors prove that the Y4Si2N2O7 host has good stability. Therefore, the Y4Si2N2O7:Ce3+, Tb3+, Dy3+ phosphors could serve as a promising candidate for UV W-LEDs and FEDs.
    Berichte der deutschen chemischen Gesellschaft 03/2014; · 2.94 Impact Factor
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    ABSTRACT: The title phosphors are synthesized by a Pechini-type sol—gel method followed by calcination in air at 950 °C for 4 h.
    ChemInform 02/2014; 45(6).
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    ABSTRACT: Ce(3+)- and/or Mn(2+)-activated Y10(Si6O22N2)O2 phosphors have been prepared via a soft-chemical ammonolysis method. Structure refinement, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared, and thermogravimetry analysis have been employed to characterize the phase purity, crystal structure, morphology, crystallization condition, chemical composition, and thermal stability of the products. The photoluminescence and cathodoluminescence properties for Ce(3+)- and Mn(2+)-doped Y10(Si6O22N2)O2 phosphors were studied in detail. For Ce(3+)/Mn(2+) singly doped Y10(Si6O22N2)O2 phosphors, typical emissions of Ce(3+) (blue) and Mn(2+) (reddish-orange) ions can be observed. Especially, Ce(3+) emission at different lattice sites 4f and 6h has been identified and discussed. Energy transfer from Ce(3+)(I) and Ce(3+)(II) to Mn(2+) ions in Y10(Si6O22N2)O2:Ce(3+),Mn(2+) samples has been validated and confirmed by the photoluminescence spectra and luminescence decay times. A color-tunable emission in Y10(Si6O22N2)O2:Ce(3+),Mn(2+) phosphors can be achieved by an energy-transfer process and a change in the doping concentration of the activators. The temperature-dependent photoluminescence properties and degradation property of cathodoluminescence under continuous electron bombardment of as-synthesized phosphors prove that the Y10(Si6O22N2)O2 host has good stability. Therefore, the Y10(Si6O22N2)O2:Ce(3+),Mn(2+) phosphors may potentially serve as single-phase blue/reddish-orange phosphors for white-light-emitting diodes and field-emission displays.
    Inorganic Chemistry 01/2014; · 4.59 Impact Factor

Publication Stats

2k Citations
1,189.35 Total Impact Points

Institutions

  • 1995–2014
    • Chinese Academy of Sciences
      • • State Key Laboratory of Drug Research
      • • Key Laboratory of Rare Earth Chemistry and Physics
      • • Changchun Institute of Applied Chemistry
      Peping, Beijing, China
  • 1996–2013
    • Northeast Institute of Geography and Agroecology
      • Key Laboratory of Rare Earth Chemistry and Physics
      Beijing, Beijing Shi, China
  • 2011
    • Beijing Jiaotong University
      • Institute of Optoelectronics Technology
      Peping, Beijing, China
    • Binghamton University
      • Department of Chemistry
      Binghamton, NY, United States
  • 2008–2011
    • Harbin Engineering University
      • College of Material Science and Chemical Engineering
      Harbin, Heilongjiang Sheng, China
  • 2006
    • Suzhou University
      • School of Chemistry and Chemical Engineering
      Suchow, Anhui Sheng, China
  • 2005
    • AMRI
      Albany, California, United States
  • 2001–2004
    • University of New Orleans
      • • Department of Chemistry
      • • Advanced Materials Research Institute (AMRI)
      New Orleans, LA, United States