Zuqiang Bian

Peking University, Peping, Beijing, China

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Publications (39)121.12 Total impact

  • Dyes and Pigments 01/2014; 106:197–204. · 3.53 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: A single-layer graphene sheet represents the thinnest transparent conductive electrode for planar photovoltaic devices on both rigid and flexible substrates. Here, we demonstrate fiber-shaped polymer solar cells wrapped by a Au nanoparticle-adsorbed graphene single-layer sheet as a counter electrode, and show cell efficiencies up to 2.53% under standard illumination, which can be improved to 4.36% when tested on a diffusive reflector. This is a relatively high efficiency reported for fiber solar cells using solid-state polymers as active layers. The graphene layer not only serves as a transparent flexible electrode for the fiber solar cells, but also provides good encapsulation on the polymer layers, resulting in excellent flexibility and device stability in both inertial gas and ambient atmosphere, with less than 5% efficiency degradation in air after 8 days. Single-layer graphene is a potential electrode material for constructing efficient and stable polymer fiber solar cells.
    RSC Advances 05/2013; · 2.56 Impact Factor
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    ABSTRACT: A novel type of NIR-emitting lanthanide complexes Ln(PND)3 (Ln = Nd, Er and Yb) was designed and synthesized based on a tridentate monoanionic N,N,O-ligand 6-(pyridin-2-yl)-1,5-naphthyridin-4-ol (PND). Such complex owns definite charge-neutral, coordination-saturated and mononuclear structure that is proved by X-ray single crystal diffraction of Nd(PND)3. Photophysical studies on the ligand and complexes reveal that the PND ligand has suitable energy level to sensitize the near-infrared (NIR) emitting lanthanide ions (Nd(3+), Er(3+), and Yb(3+)). Among the three compounds, Yb(PND)3 shows the highest photoluminescence quantum yield up to 0.9% in a mixture of acetonitrile and methanol solution (10 : 1, v/v, 10(-4) M). Thermal measurements indicate that these compounds have high decomposition (Td) and glass transition (Tg) temperature up to 420 and 265 °C, respectively, implying great advantage for constructing organic electronic devices via vacuum deposition method. At last, NIR organic light-emitting diodes (OLEDs) with simple three-layer structure were fabricated to test their electroluminescent performance, showing maximum NIR irradiance and maximum external quantum efficiency (EQE) of 25 μW cm(-2) and 0.019% for Nd(3+), 0.46 μW cm(-2) and 0.004% for Er(3+), and 86 μW cm(-2) and 0.14% for Yb(3+), respectively.
    Dalton Transactions 05/2013; · 3.81 Impact Factor
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    ABSTRACT: Most of previous fiber-shaped solar cells were based on photoelectrochemical systems involving liquid electrolytes, which brought issues such as device encapsulation and stability. Here, we deposited classical semiconducting polymer-based bulk heterojunction layers onto stainless steel wires to form primary electrode, and adopted carbon nanotube thin films or densified yarns to replace conventional metal counter electrode. The polymer-based fiber cells with nanotube film or yarn electrodes showed power conversion efficiencies in the range of 1.4% to 2.3%, with stable performance upon rotation and large-angle bending, and during long time storage without further encapsulation. Our fiber solar cells consisting of a polymeric active layer sandwiched between steel and carbon electrodes have the potential for manufacturing low-cost, liquid-free and flexible fiber-based photovoltaics.
    ACS Nano 11/2012; · 12.06 Impact Factor
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    ABSTRACT: Pt is a classical catalyst that has been extensively used in fuel cell and solar cell electrodes, owing to its high catalytic activity, good conductivity, and stability. In conventional fiber-shaped solar cells, solid Pt wires are usually adopted as the electrode material. Here, we report a Pt nanoparticle-adsorbed carbon nanotube yarn made by solution adsorption and yarn spinning processes, with uniformly dispersed Pt nanoparticles through the porous nanotube network. We have fabricated TiO(2)-based dye-sensitized fiber solar cells with a Pt-nanotube hybrid yarn as counter electrode and achieved a power conversion efficiency of 4.85% under standard illumination (AM1.5, 100 mW/cm(2)), comparable to the same type of fiber cells with a Pt wire electrode (4.23%). Adsorption of Pt nanoparticles within a porous nanotube yarn results in enhanced Pt-electrolyte interfacial area and significantly reduced charge-transfer resistance across the electrolyte interface, compared to a pure nanotube yarn or Pt wire. Our porous Pt-nanotube hybrid yarns have the potential to reduce the use of noble metals, lower the device weight, and improve the solar cell efficiency.
    ACS Nano 08/2012; 6(8):7191-8. · 12.06 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: A series of N^N,O^O-bridging ligands based on substituted 1-(pyridin-2-yl)-3-methyl-5-pyrazolone and their corresponding heteroleptic iridium(III) complexes as well as Ir-Eu bimetallic complexes were synthesized and fully characterized. The influence of the triplet energy levels of the bridging ligands on the energy transfer (ET) process from the Ir(III) complexes to Eu(III) ions in solution was investigated at 77 K in Ir(III)/Eu(III) dyads. Photophysical experiment results show the bridging ligands play an important role in the ET process. Only when the triplet energy level of the bridging ligand was lower than the triplet metal-to-ligand charge transfer ((3)MLCT) energy level of the Ir moiety, was pure emission from the Eu(III) ion observed, implying complete ET took place from the Ir moiety to the Eu(III) ion.
    Dalton Transactions 09/2011; 40(43):11410-8. · 3.81 Impact Factor
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    ABSTRACT: In this work, for the first time, uniform blue-emitting EuCl(2) nanoprisms and nanorods were synthesized from Eu(CCl(3)COO)(3)·2H(2)O [or Eu(CH(3)COO)(3)·H(2)O] by a novel mild liquid reduction route, using acetamidine hydrochloride (or picolinamidine hydrochloride) as the reductant in oleylamine. The synthetic reaction even can take place under an atmosphere in the absence of inert gas at around 300 °C. The EuCl(2) nanoprism dispersion in n-hexane showed an intense blue emission when excited by UV light.
    Inorganic Chemistry 06/2011; 50(15):6862-4. · 4.59 Impact Factor
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    ABSTRACT: Two novel iridium(III) complexes, [Ir(dfppy)(2)(pmc)] and [Ir(ppy)(2)(pmc)] (dfppy = 2-(4',6'-difluoro-phenyl)pyridine, ppy = 1-phenyl-pyridine), were designed and synthesized using 2-carboxyl-pyrimidine (Hpmc) as an ancillary ligand. Single crystals were obtained and characterized by single crystal X-ray diffraction. The tetrametallic complexes {[(C^N)(2)Ir(μ-pmc)](3)EuCl(3)} (C^N = dfppy, ppy) were synthesized using the iridium(III) complexes as "ligands". Photophysical and theoretical studies indicate that [Ir(dfppy)(2)(pmc)] is more suitable for sensitizing the emission of Eu(III) ions than [Ir(ppy)(2)(pmc)].
    Dalton Transactions 03/2011; 40(20):5476-82. · 3.81 Impact Factor
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    ABSTRACT: Hybrid photovoltaic devices based on a blend of poly (3-hexylthiophene):(6,6)-phenyl C61 butyric acid methyl ester and ZnO nanorod arrays (NRAs) with different densities have been investigated. Their surface morphology demonstrates that the interspaces of low-density ZnO nanorod arrays facilitate the complete infiltration of the polymer and close contact between NRAs, thus providing more double heterojunction interfaces and effective carriers transport paths than high-density NRAs. A remarkable improvement in power conversion efficiency from 2.80% to 4.07% has been achieved in the device with low-density ZnO NRAs relative to that with high-density ZnO NRAs.
    Chemical Physics Letters 01/2011; 516(1):92-95. · 2.15 Impact Factor
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    ABSTRACT: Transparent solar cells are very useful in making transparent electrical power supplies and tandem devices. We report the fabrication of semi-transparent polymer solar cells by replacing conventional metal electrode with a carbon nanotube film. The solar cells can be illuminated at both front and back sides, with power conversion efficiencies (up to 2.5%) comparable to cells using metal electrodes. The solar cells are highly transparent in near-infrared region, with an optical transmittance of nearly 80% in the range of 670 nm to 1.2 μm, and maintain a transmittance of above 60% through 1.2 to 2.5 μm. We further constructed a tandem structure with two subcells operating separately, in which the back cell receives infrared light transmitted through the front cell. Our infrared-transparent solar cells possess multiple functions such as serving as a light filter to drive a CdSe nanobelt photo-sensor with enhanced wavelength selectivity.
    Journal of Materials Chemistry 09/2010; 20(39):8478-8482. · 5.97 Impact Factor
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    ABSTRACT: A series of phosphorescent zwitterionic iridium(III) complexes, with 4-carboxy-2, 2'-bipyridine-4'-carboxylate (Hdcbpy) as ancillary ligand, Ir(C(wedge)N)(2)(Hdcbpy) (C(wedge)N = 1-phenylpyrazole (ppz), 1-phenyl-pyridine (ppy), 2-(4',6'-difluoro-phenyl)pyridine (dfppy), 1-phenyl-isoquinoline (piq), dibenzo[f,h]quinoxaline (dbq)), were prepared and characterized. Their photophysical properties were studied, and intense luminescence emissions were observed based on metal-to-ligand-charge-transfer ((3)MLCT), ligand-to-ligand charge-transfer ((3)LLCT), ligand-centered transitions ((3)LC, i.e., (3)pi --> pi*), or intraligand-charge-transfer ((3)ILCT) excited states, which were confirmed by theoretical calculations. The quantum yield of Ir(dfppy)(2)(Hdcbpy) is as high as 0.106 in aqueous solution. With Hdcbpy as a hydrophilic part, their amphiphilic structures as further confirmed by X-ray single crystal data endow them with different solubilities in phosphate buffer solution (PBS, pH 7.0). The compounds were successfully applied as luminescent dyes for cell imaging in aqueous solution. Their different stain ability in cell imaging was fairly well supported by the experimental data based on the measurement of oil/water partition coefficients and encapsulation/release with liposomes.
    Inorganic Chemistry 03/2010; 49(7):3252-60. · 4.59 Impact Factor
  • Molecular Organometallic Materials for Optics: , Topics in Organometallic Chemistry, Volume 28. ISBN 978-3-642-01865-7. Springer-Verlag Berlin Heidelberg, 2010. 01/2010;
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    ABSTRACT: Several 1,10-phenanthroline derivatives (PhoR), 2,2′-bipyridine derivatives (BpoR) and related europium complexes Eu(TTA)3PhoR and Eu(TTA)3BpoR were synthesized (HTTA = 2-thenoyltrifluoroacetone). Single crystal X-ray diffraction of Eu(TTA)3Php (Php = 2-(pyridyl)-1,10-phenanthroline) shows that Php acts as a tridentate NNN ligand, leading to a high stability of the complex for vacuum evaporation. When an oxadiazole moiety is incorporated into the ligand, the corresponding europium complexes show improved carrier-transporting abilities as well as thermal stabilities under vapor deposition for electroluminescence (EL) applications. Experiments revealed that these complexes have high photoluminescence (PL) quantum yields due to suitable triplet energy levels (ET) of the ligands, between 19724 and 22472 cm−1, for the sensitization of Eu(III) (5D0: 17500 cm−1). Utilizing Eu(TTA)3PhoB (PhoB = 2-(5-phenyl-1,3,4-oxadiazol-2-yl)-1,10-phenanthroline) as the dopant emitter in CBP (4,4′-N,N′-dicarbazolebiphenyl), EL devices with a structure of TPD (4,4′-bis[N-(p-tolyl)-N-phenylamino] biphenyl, 30 nm)/Eu(TTA)3PhoB:CBP (7.5%, 20nm)/BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, 20 nm)/Alq3 (tris(8-hydroxyquinoline), 30 nm) exhibited a pure emission from europium ions. The highest efficiency obtained was 5.5 lm W−1, 8.7 cd A−1 and the maximum brightness achieved was 1086 cd m−2. At a practical brightness of 100 cd m−2, the efficiency remains above 2.0 cd A−1.
    New Journal of Chemistry 01/2010; 34(3). · 2.97 Impact Factor
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    ABSTRACT: Small molecules have a great potential in developing organic solar cells owing to their well-controlled structure and tunable electronic properties by functionalization. Here, we use a classical fluorescent dye with a D-π-A structure, 4-(dicyanomethylene)-2-methyl-6-(4-dimethyl-aminostyryl)-4H-pyran (DCM), as an efficient light absorption layer with sensitivity at wavelengths of 400–600 nm where the aromatic amine/C60 cells have low absorbance. Combined with a p-type transporting layer of selected aromatic amines, the much improved layer and interface morphology yield solar cell power conversion efficiency up to 1.68% under AM 1.5 and 100 mW cm−2 illumination. The morphology of active organic layers, their interface, and the influence on the cell performance have been systematically studied.
    Organic Electronics. 01/2010;
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    ABSTRACT: A neutral ligand 9-(4-tert-butylphenyl)-3,6-bis(diphenylphosphineoxide)-carbazole (DPPOC) and its complex Tb(PMIP)3DPPOC (A, where PMIP stands for 1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone) were synthesized. DPPOC has a suitable lowest triplet energy level (24,691 cm−1) for the sensitization of Tb(III) (5D4: 20,400 cm−1) and a significantly higher thermal stability (glass transition temperature 137 °C) compared with the familiar ligand triphenylphosphine oxide (TPPO). Experiments revealed that the emission layer of the Tb(PMIP)3DPPOC film could be prepared by vacuum co-deposition of the complex Tb(PMIP)3(H2O)2 (B) and DPPOC (molar ratio = 1:1). The electroluminescent (EL) device ITO/N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-diphenyl-4,4′-diamine (NPB; 10 nm)/Tb(PMIP)3 (20 nm)/co-deposited Tb(PMIP)3DPPOC (30 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP; 10 nm)/tris(8-hydroxyquinoline) (AlQ; 20 nm)/Mg0.9Ag0.1 (200 nm)/Ag (80 nm) exhibited pure emission from terbium ions, even at the highest current density. The highest efficiency obtained was 16.1 lm W−1, 36.0 cd A−1 at 6 V. At a practical brightness of 119 cd m−2 (11 V) the efficiency remained above 4.5 lm W−1, 15.7 cd A−1. These values are a significant improvement over the previously reported Tb(PMIP)3(TPPO)2 (C).
    Organic Electronics 08/2009; 10(5):939–947. · 3.84 Impact Factor
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    ABSTRACT: Hybrid photovoltaic (PV) devices based on copper-phthalocyanine and fullerene combined with ZnO nanowire array as direct charge transport paths were fabricated. The optimized device with ZnO nanowire has a more than fourfold increase in PV performance than the device without nanowire. The former has an open circuit voltage of 0.46 V, a short circuit current of 3.86 mA/cm2, a fill factor of 0.30, and a power conversion efficiency of 0.53%. The hybrid device based on ZnO nanowires with improved PV performance suggests a way for fabrication of PV device with more exciton dissociation interface area and continuous carrier transport paths.
    Applied Physics Letters 04/2009; 94(17):173107-173107-3. · 3.79 Impact Factor
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    ABSTRACT: We investigated highly efficient phosphorescent organic light-emitting diodes (OLEDs) based on an orange–red emission iridium complex as the guest and five green emission iridium complexes as the host material, respectively. For comparison, a device using a common fluorescent host CBP (4,4′-bis(N-carbazolyl)-1,1′-biphenyl) has also been fabricated. Results show that the steric hindrance and exciton transporting property of the iridium complex host are found to be critical to this kind of doping system, a proper steric hindrance and improved exciton transporting ability result in reducing of triplet–triplet annihilation, thus improving of the device performance. In addition, all devices using iridium complexes as host have better performance than that of CBP, which arised from the fact that those green emission iridium complexes have a lower triplet excited energy befitting for energy confinement and a higher highest occupied molecular orbital (HOMO) level for hole injection.
    Organic Electronics 04/2009; 10(2):247–255. · 3.84 Impact Factor
  • Source
    Fangfang CHEN, Zuqiang BIAN, Chunhui HUANG
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    ABSTRACT: The research on electroluminescence based on europium(III) complexes has come to an important phase. This article reviewed the progresses in photoluminescence and electroluminescence of Eu(III) complexes in recent years from the views of the design of Eu(III) complexes and optimization of device structures, and discussed some important factors influencing electroluminescence performance. The problems existing in the practical application such as the volatility and thermal stability of Eu(III) complexes in this area were discussed, and the possible corresponding solutions were briefly prospected.
    Journal of Rare Earths. 01/2009;
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    ABSTRACT: Bipyrimidines have been chosen as (N∧N)(N∧N) bridging ligands for connecting metal centers. IrIII-LnIII (Ln = Nd, Yb, Er) bimetallic complexes [Ir(dfppy)2(μ-bpm)Ln(TTA)3]Cl were synthesized by using Ir(dfppy)2(bpm)Cl as the ligand coordinating to lanthanide complexes Ln(TTA)3·2H2O. The stability constants between Ir(dfppy)2(bpm)Cl and lanthanide ions were measured by fluorescence titration. The obvious quenching of visible emission from IrIII complex in the IrIII-LnIII (Ln = Nd, Yb, Er) bimetallic complexes indicates that energy transfer occurred from IrIII center to lanthanides. NIR emissions from NdIII, YbIII, and ErIII were obtained under the excitation of visible light by selective excitation of the IrIII-based chromophore. It was proven that Ir(dfppy)2(bpm)Cl as the ligand could effectively sensitize NIR emission from NdIII, YbIII, and ErIII.
    Science in China Series B Chemistry 01/2009; 52(11):1808-1813. · 1.20 Impact Factor
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    ABSTRACT: An iridium complex PIr(qnx) (iridium(III) bis(2-phenylpyridinato-N,C(2))(quinoxaline-2-carboxylate)) is reported for its unique and fast vapochromic and vapoluminescent behaviors. The emission of PIr(qnx) is governed by the whole crystal rather than the individual molecule. PIr(qnx) has been found to exist as both black and red forms in the solid state. The black form can be transformed into the red form upon its exposure to acetonitrile or propiononitrile vapor, whereas no response was observed when it was exposed to other volatile organic compounds. To understand the vapochromic and vapoluminescent behaviors, we determined crystal structures of both forms by X-ray diffraction. In addition, we employed density functional theory in investigating weak intermolecular interactions, such as hydrogen bonding and pi-pi interactions in the two forms.
    Inorganic Chemistry 10/2008; 47(18):8025-30. · 4.59 Impact Factor

Publication Stats

99 Citations
1 Download
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121.12 Total Impact Points

Institutions

  • 1970–2014
    • Peking University
      • • National Laboratory of Rare Earth Material Chemistry and Application
      • • Beijing National Laboratory for Molecular Science
      Peping, Beijing, China
  • 2001–2005
    • Beijing Normal University
      • Department of Chemistry
      Peping, Beijing, China