Ruiping Deng

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (52)180.87 Total impact

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    ABSTRACT: In this study, we aim to further enhance the electroluminescence (EL) performances of trivalent europium complex Eu(TTA)3phen (TTA=thenoyltrifluoroacetone, phen=1,10-phenanthroline) by designing the device structure with stepwise energy levels. The widely used bipolar material 2,6-bis(3-(9 H-carbazol-9-yl)phenyl)pyridine (26DCzPPy) was chosen as host material, while the doping concentration of Eu(TTA)3phen was optimized to be 4%. To facilitate the injection and transport of holes, MoO3 anode modification layer and 4,4′,4′′-Tris(carbazole-9-yl)triphenylamine (TcTa) hole transport layer were inserted in sequence. Efficient pure red emission with suppressed efficiency roll-off was obtained attributed to the reduction of accumulation holes, the broadening of recombination zone, and the improved balance of holes and electrons on Eu(TTA)3phen molecules. Finally, the device with 3 nm MoO3 and 5 nm TcTa obtained the highest brightness of 3278 cd/m2, current efficiency of 12.45 cd/A, power efficiency of 11.50 lm/W, and external quantum efficiency of 6.60%. Such a device design strategy helps to improve the EL performances of emitters with low-lying energy levels and provides a chance to simplify device fabrication processes.
    Journal of Luminescence 03/2015; DOI:10.1016/j.jlumin.2015.02.053 · 2.72 Impact Factor
  • Zhiyong Guo · Shengqun Su · Ruiping Deng · Hongjie Zhang
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    ABSTRACT: Synthesis of a new cobalt-based MOF constructed from a tricarboxylic acid linker.•Compound 1 displays unique (2,3,10)-connected trinodal topology.•Compound 1 represents a rare example of MOF possessing free carboxylic acids.•The magnetic property of compound 1 has been investigated.
    Inorganic Chemistry Communications 10/2014; 51. DOI:10.1016/j.inoche.2014.10.030 · 1.78 Impact Factor
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    ABSTRACT: Water-soluble hexagonal NaScF4:Yb/Er nanocrystals have been directly synthesized via a facile one-step hydrothermal route. The as-prepared nanocrystals were monodisperse and could form stable colloidal solutions in polar solvents, such as water and ethanol. The novel NaScF4:Yb/Er nanocrystals exhibited intrinsic intense red upconversion emission, in contrast to other lanthanide-doped fluoride nanocrystals. Remarkably, the upconversion emission intensity was enhanced ∼6.8 times through the coating of an active-shell (containing Yb(3+)) surrounding the NaScF4:Yb/Er core nanocrystals, owing to surface passivation effect and efficient energy transfer from Yb(3+) ions in both the core and the shell to Er(3+) ions. These water-soluble hexagonal NaScF4:Yb/Er nanocrystals with intense red emission are ideal for a variety of in vitro and in vivo biological imaging applications.
    Dalton Transactions 05/2014; 43(26). DOI:10.1039/c4dt00708e · 4.20 Impact Factor
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    ABSTRACT: A novel metal/semiconductor hybrid nanocomposite with enhanced catalytic and magnetic properties has been prepared via a simple self-assembly approach. The new material consists of highly dispersed Au or Pt nanoparticles anchored to the surface of the Ni7S6 microflowers. The density of Au nanoparticles decorated each Ni7S6 microflowers can be readily controlled through suitably modulating the concentration of Au added. Our approach provides an efficient method to attach metal nanostructures to semiconductors and can be used in catalytic, optical and magnetic applications.
    Materials Research Bulletin 05/2014; 53:199–204. DOI:10.1016/j.materresbull.2014.01.026 · 2.29 Impact Factor
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    ABSTRACT: In this work, organic electroluminescent (EL) devices with dominant and supplementary light-emitting layers (EMLs) were designed to further improve the EL performances of two iridiumIII-based phosphorescent complexes, which have been reported to provide EL devices with slow EL efficiency roll-off. The widely used hole-block material 2,2′,2ʺ-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) was selected as host material to construct the supplementary EML. Compared with single-EML devices, double-EMLs devices showed higher EL efficiencies, higher brightness, and lower operation voltage attributed to wider recombination zone and better balance of carriers. In addition, the insertion of supplementary EML is instrumental in facilitating carriers trapping, thus improving the color purity. Finally, high performance blue-green and green EL devices with maximum current efficiencies of 35.22 and 90.68 cd/A, maximum power efficiencies of 26.36 and 98.18 lm/W, and maximum brightness of 56,678 and 112,352 cd/m2, respectively, were obtained by optimizing the doping concentrations. Such a device design strategy extends the application of a double EML device structure and provides a chance to simplify device fabrication processes.
    Journal of Luminescence 04/2014; 148:6–9. DOI:10.1016/j.jlumin.2013.11.072 · 2.72 Impact Factor
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    ABSTRACT: Photoluminescence (PL) and electroluminescence (EL) properties of a samarium complex Sm(DBM)3 phen (DBM = dibenzoylmethane, phen = 1,10-phenanthroline) were investigated in both visible and near-infrared (NIR) regions. A series of organic light emitting devices based on Sm(DBM)3 phen were fabricated. The device performances were strongly dependent on the hole transportation layer/emitting layer (HTL/EML) interface properties. When using N,N′-diphenyl-N,N-di(m-tolyl)-benzidine (TPD) as HTL, intense NIR EL irradiance could be achieved, accompanied with orange EL emission. When N,N′-di(naphthalen-1-yl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (NPB) was used as HTL, exciplex formed at the HTL/EML interface, and white light emission could be achieved under high operating voltage, due to the integrating of the blue emission from the exciplex and orange emission from Sm3+ ion. Better white organic light emitting diodes (WOLEDs) could be achieved when a ladder HTL 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) was introduced into the device, that the device showed bright stable white emission properties under all operating voltages. This work provided a feasible way for the design and fabrication of NIR and WOLEDs with simple device structures.
    Science of Advanced Materials 11/2013; 5(11):1556-1562. DOI:10.1166/sam.2013.1634 · 2.60 Impact Factor
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    ABSTRACT: Bright dots: Semiconducting polymer dots (Pdots) doped with europium complexes possess line-like fluorescence emission, high quantum yield, and long fluorescence lifetime. The Pdots successfully labeled receptors on cells. The long fluorescence lifetime of the Pdots was used to distinguish them from other red fluorescence emitting nanoparticles, and improve the signal-to-noise ratio for time-gated cellular imaging. PVK=poly(9-vinylcarbazole).
    Angewandte Chemie International Edition 10/2013; 52(43). DOI:10.1002/anie.201304822 · 11.26 Impact Factor
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    ABSTRACT: Hydrophilic BaYF5 nanocrystals have been prepared via a facile and fast microwave-assisted method at low temperature without the assistance of template reagents. The Yb3+/Er3+, Ce3+/Tb3+ doped BaYF5 nanocrystals could be dispersed well in water and alcohol. BaYF5:Ce3+/Tb3+ nanocrystals show bright green luminescence. The existence of the Ce3+ ions can dramatically enhance the luminescence intensity of the Tb3+ ions, due to the efficient energy transfer from Ce3+ to Tb3+ ions. More importantly, when doped with Yb3+/Er3+ ions, the BaYF5 nanocrystals show bright red upconversion luminescence.
    CrystEngComm 10/2013; 15(38):7640. DOI:10.1039/c3ce40961a · 4.03 Impact Factor
  • Song Wang · Shengqun Su · Shuyan Song · Ruiping Deng · Hongjie Zhang
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    ABSTRACT: Bifunctional lanthanide doped 3D raisin-like GdF3 nanocrystals were synthesized by a microwave method. The influences of synthesis parameters on the final morphology were investigated and the morphology can be tuned to snow-like microcrystals and nanocrystals. The as-prepared samples possess properties of multicolor upconversion (UC) photoluminescence (PL) and paramagnetism. To understand the magnetic mechanism, temperature dependence of zero-field cooling (ZFC) and field cooling (FC) magnetization of the raisin-like GdF3 nanocrystals were studied.
    CrystEngComm 06/2012; 14(13):4266-4269. DOI:10.1039/C2CE25208B · 4.03 Impact Factor
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    ABSTRACT: The syntheses, crystal structures, magnetic and luminescent properties of three isomorphous compounds [Ln(III) (6)(A mu(4)-O)(2)(C4A)(2)-(NO3)(2)(HCOO)(2)(CH3O)(2)(DMF)(4)(CH3OH)(4)] (Ln = Gd (1), Tb (2) and Dy (3); H(4)C4A = p-tert-butylcalix[4]arene) are reported. These three compounds are featured with the sandwich-like units constructed by two tail-to-tail calixarene molecules and an in-between Ln(III) (6) octahedron. The Dy-III compound exhibits both single molecule magnet behavior and photoluminescence.
    Science China-Chemistry 06/2012; 55(6). DOI:10.1007/s11426-012-4570-5 · 1.70 Impact Factor
  • Acta Chimica Sinica -Chinese Edition- 01/2012; 70(18):1904. DOI:10.6023/A12060324 · 1.43 Impact Factor
  • Ruiping Deng · Shuyan Song · Ran Pang · Chengyu Li · Hongjie Zhang
    01/2012; 42(9):1337. DOI:10.1360/032012-374
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    ABSTRACT: Three three-dimensional coordination polymers, namely, [NH2(CH3)2][Co2(MDIP)(OH)(H2O)]·C3H7NO·H2O (1), [NH2(CH3)2]2[Mn3(MDIP)2]·2C3H7NO (2), and [NH2(CH3)2][Mg3(MDIP)(HMDIP)(C3H7NO)]·4H2O (3) (DMF = N,N′-dimethylformamide), have been synthesized by the solvothermal reaction of Co(II), Mn(II), or Mg(II) salts with methylenediisophthalic acid (H4MDIP). All compounds have been characterized by thermogravimetric analysis, IR spectroscopy, elemental and single-crystal X-ray diffraction analyses. Complexes 1–3 are anionic frameworks with [NH2(CH3)2]+ ions occupying the voids, built upon tetra-, tri- and asymmetrical trimetallic cores, respectively. In particular, the asymmetrical trinuclear Mg(II) unit in complex 3 was scarcely observed. Topological analyses show that the three compounds possess binodal (4,8)-connected alb topology with a Schläfli symbol of (410.614.84)(45.6)2. Magnetic investigations indicate that antiferromagnetic couplings are dominant in compounds 1 and 2.
    CrystEngComm 09/2011; 13(20):6057-6064. DOI:10.1039/C1CE05149K · 4.03 Impact Factor
  • Shufang Xue · Lang Zhao · Yun-Nan Guo · Ruiping Deng · Yang Guo · Jinkui Tang
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    ABSTRACT: The syntheses, crystal structures and magnetic studies are reported for a series of Ln(4) clusters formulated as Ln(4)(μ(3)-OH)(2)(php)(2)(OAc)(6)(H(2)O)(2)]·4MeOH·nH(2)O (Ln = Gd (1), Tb (2), Dy (3) (n = 2) and Ho (4) (n = 0); H(2)php = 2,6-(picolinoylhydrazone)pyridine). The overall metal core of each cluster is comprised of two edge-sharing triangular Ln(3) units linked by μ(3)-OH bridges. Direct-current (dc) magnetic susceptibility studies reveal that the Ln(III) ions are very weakly coupled in all four compounds. Alternating-current (ac) magnetic susceptibility studies for 3 indicate that field-induced slow relaxation phenomenon occurs for this compound.
    Dalton Transactions 09/2011; 40(33):8347-52. DOI:10.1039/c1dt10654f · 4.20 Impact Factor
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    ABSTRACT: The ligand 1-(2-naphthyl)-4,4,4-trifluoro-1,3-butanedionate (Htfnd) has been employed to synthesize six novel ternary–lanthanide complexes in which the synergic ligands were 1,10-phenanthroline-5,6-dione (dione) and 4,5-diazafluoren-9-one (dafone), respectively. Two series of complexes Ln(tfnd)3dione and Ln(tfnd)3dafone (Ln=Ho, Pr, Tm) were obtained. These complexes were characterized by elemental analysis, Fourier Transform Infrared spectra and diffused reflectance. After ligand-mediated excitation, Ln(tfnd)3dione and Ln(tfnd)3dafone all show the characteristic NIR luminescence of the corresponding Ln3+ ions (Ln=Ho, Pr, Tm). This can be attributed to the efficient energy transfer from ligands to central Ln3+ ions, via an antenna effect. The indirect energy transfer in the complexes has been investigated and the differences in the luminescence intensity between Ln(tfnd)3dione and Ln(tfnd)3dafone were discussed in detail. The excellent luminescent performances enable these NIR-luminescent complexes to have potential applications in optical amplification operating at 1300 or 1500 nm.
    Journal of Luminescence 09/2011; 131(9):1857–1863. DOI:10.1016/j.jlumin.2011.04.018 · 2.72 Impact Factor
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    ABSTRACT: Well-defined 3D Ni(OH)2 nanoflowers were synthesized in high yield via a simple surfactant-free hydrothermal process. On the basis of a series of contrast experiments, the probable growth mechanism and fabrication process of the products were proposed. NiO nanoflowers have also been obtained by thermal decomposition of Ni(OH)2 nanoflowers in air at 500 °C. N2 adsorption–desorption measurements indicate the BET surface area is 198 m2 g−1 and the average pore size of the NiO nanoflowers is 15.1 nm. The electrochemical properties of the NiOelectrodes in a lithium ion battery and magnetic performance were also investigated. The first discharge capacity of the NiO nanoflowers could reach about 1300 mA h g−1. The unique flower-like structure played a critical role in the morphology requirement to serve as a transport path for lithium ions in lithium batteries.
    CrystEngComm 07/2011; 13(15):4903-4908. DOI:10.1039/C1CE05237C · 4.03 Impact Factor
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    ABSTRACT: Well-defined Sb2S3 microspheres consisted of many small nanoparticles were synthesized via a simple one-pot hydrothermal process. On the basis of a series of contrast experiments, the probable growth mechanism and fabrication process of the products were proposed. The optical properties of the products were studied as well and the results demonstrated that the products presented blue luminescence related to the corresponding microstructure. In addition, we firstly verified that the Sb2S3 microspheres could store hydrogen electrochemically, and a discharge capacity of 101 mA h g−1 was measured under normal atmosphere at room temperature.
    Solid State Sciences 06/2011; 13(6):1226-1231. DOI:10.1016/j.solidstatesciences.2011.02.007 · 1.84 Impact Factor
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    ABSTRACT: Five new three/two-fold interpenetrated coordination polymers, namely, [Cd(mfda)(L1)] (1), [Cd(efda)(L1)] (2), [Zn2(mfda)2(L2)]·DMF·H2O (3), [Zn2(efda)2(L2)]·(DMF)0.25, (4) and [Cd2(mfda)2(L2)2]·DMF·H2O (5) (H2mfda = 9,9-dimethylfluorene-2,7-dicarboxylic acid, H2efda = 9,9-diethylfluorene-2,7-dicarboxylic acid, L1 = Methylene bis(3,5-dimethylpyrazole) and L2 = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene), have been synthesized under solvent-thermal conditions with mixed ligands. Compounds 1 and 2 are isostructural and possess two-dimensional (6, 3) layered structures containing two kinds of rings. Three equivalent (6, 3) net interpenetrate in a parallel fashion to form an unprecedented mat-like 2D sheet. Compounds 3 and 4 are almost identical in structure and display threefold interpenetrating α–Po net structures. Compound 5 displays a twofold interpenetrated 3D 6-connected net with α–Po topology. The luminescent properties of these compounds have been studied in the solid state at room temperature.
    CrystEngComm 04/2011; 13(8):2935-2941. DOI:10.1039/C0CE00662A · 4.03 Impact Factor
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    ABSTRACT: Well-defined porous Co3O4 microcubes have been synthesized by a simple one-pot solvothermal method combined with subsequent calcination. The formation mechanism of the cube-like precursor was proposed based on the anisotropic intrinsic structure of CoCO3. Importantly, after thermal treatment, the cube-like morphology could be completely preserved. Moreover, the thermal decomposition of the corresponding precursor led to the formation of porous structure. The effects of calcination temperature on the catalytic properties of Co3O4 samples were investigated and the results demonstrated that 600 °C was superior among three samples with the highest catalytic properties. Additionally, as an antiferromagnetic material, the sample showed a certain degree of ferromagnetism under the external magnetic field.
    CrystEngComm 03/2011; 13(6):2123-2129. DOI:10.1039/C0CE00392A · 4.03 Impact Factor
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    ABSTRACT: Uniform "core-satellite" structured nanoparticles containing organic dye incorporated in the silica shell and fluorescence quenching Au nanoparticles have been synthesized with excellent fluorescent properties, and their targeted imaging application in tumor cells has been investigated.
    Dalton Transactions 03/2011; 40(18):4800-2. DOI:10.1039/c1dt10106d · 4.20 Impact Factor