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Synthesis and photoluminescent characteristics of 8-hydroxy-2-methylquinoline gallium

Gongneng Cailiao/Journal of Functional materials 2013年第4期44卷 540-543页

作者： Sun, Chun-Yan Liu, Xu-Guang Tao, Peng Chen, Liu-Qing Key Lab. of Interface Sci. and Eng. in Advanced Mat. of Taiyuan Univ. of Technol. Ministry of Education Taiyuan 030024 China College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

8-Hydroxy-2-methylquinoline gallium (Ga(mhq)3) was synthesized, and its molecular structure was characterized by FT-IR spectrometry and 1H NMR techniques. Its optical gap and photocurrent properties were investigated by UV-Vis absorption spectrometry, cyclic voltammetry, fluorescent emission spectrometry and electroluminescent spectrometry. Experimental results show that its optical gap is about 3.10 eV, as determined from its UV-Vis absorption edge. Its UV absorption bands were at 259 and 365 nm. Ga(mhq)3 emitted intensive blue-green fluorescence at peak wavelength of 496 and 472 nm in THF solution and powder state, respectively. Finally, devices using Ga(mhq)3 as the emissive layer were fabricated and investigated. The device A with configuration of ITO/NPB(50 nm)/Ga(mhq)3(30 nm)/LiF(1nm)/Al(100 nm) showed maximum emission peak at 508 nm and the maximum brightness of 901.5 cd/m2, after optimization by introducing electron-transporting material Alq3, brightness can reach 4339 cd/m2.

关键词： Luminance

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Research Development for Morphology and Function of GaN with Different Metal Catalysts

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Procedia engineering 2012年 27卷 1744-1751页

作者： Lin Zhu Hua Zhang Chunyan Yu Junfu Zhao Jian Liang Shufang Ma Bingshe Xu Education Key Laboratory of Interface Science and Engineeringin Advanced Materials TaiYuan 030024 China College of Material Science and Engineering of TYUT TaiYuan 030024 China

GaN nanomaterials are displaying infinite develop potential in blue light-emitting diode (LED).Therefore, the preparation of low-cost and high-powered GaN nonmaterial has been one of the focuses for scientific researchers. It is known that different catalysts have different impacts on the surface and function of GaN in the process of preparation. Therefore the proper catalysts must be selected to grow GaN nanostructure with high-quality and performance. In the present study, the effects of different catalysts on the surface and function of GaN have been summarized. Those catalysts includes Ni, In, Au, Ag, and so on. Furthermore, the advantages and disadvantages of those catalysts have been overviewed.

关键词： metal catalysts GaN nano materials eresearch development

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Joining of Zirconia and Ti-6Al-4V Using a Ti-based Amorphous Filler

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Journal of materials science & Technology 2011年第7期27卷 653-658页

作者： Yuhua Liu Jiandong Hu Yaping Zhang Zuoxing Guo Yue Yang Key Lab. of Automobile Materials Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130025 China Key Lab. of Advanced Structural Materials Ministry of Education Changchun University of Technology Changchun 130012 China

Polycrystalline ZrO2-3 mol.%Y2O3 was brazed to Ti-6Al-4V by using a Ti47Zr28Cu14Ni11（at.%） amorphous ribbon at 1123–1273 K in a high vacuum. The influences of brazing temperature on the microstructure and shear strength of the joints were investigated. The interfacial microstructures can be described as ZrO2/TiO＋TiO2＋Cu2Ti4O＋Ni2Ti4O/α-Ti＋（Ti,Zr）2（Cu,Ni） eutectic/acicular Widmanst¨aten structure/Ti–6Al–4V alloy. With the increase in the brazing temperature, the thickness of the TiO＋TiO2＋Cu2Ti4O＋Ni2Ti4O layer reduced, the content of the α-Ti＋（Ti,Zr）2（Cu,Ni） eutectic phase decreased, while that of the coarse α-Ti phase gradually increased. The shear strength of the joints did not show a close relationship with the thickness of the TiO＋TiO2＋Cu2Ti4O＋Ni2Ti4O layer. However, when the coarse （Ti,Zr）2（Cu,Ni） phase was non-uniformly distributed in the α-Ti phase, or when α-Ti solely situated at the center of the joint, forming a coarse block or even connecting into a continuous strip, the shear strength greatly decreased.

关键词： Brazing Amorphous filler interface Microstructure Shear strength

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Preparation and current distribution performance of Pb-Al layered composite anode materials

Preparation and current distribution performance of Pb-Al la...

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作者： Zhou, Shenggang Zhu, Peixian Sun, Yong Sun, Lida Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming Yunnan 650093 China Key Lab. of Advanced Materials of Precious-Nonferrous Metals of Yunnan Province Kunming Yunnan 650091 China College of Science Honghe University Mengzi Yunnan 661100 China

ISBN: (纸本)9781118029473

Taking Sn as the third element in the Pb-Al immiscible system, the Al-Sn-Pb layered composite materials at different temperatures were prepared by solid-liquid coating method. Microstructure of the layered composite materials was studied by scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS), and then the current distribution performance as the anode material for zinc electrowinning in ZnSO4-MnSO4-H 2SO4 system was characterized by electric analysis module of ANSYS program . The results showed that, introducing of Sn reduced the enthalpy heat of mixing of Pb-Al system to be negative, and inter-diffusion of elements in the interface region occurred, and a metallurgical bonding interface between Pb and Al formed. Compared with the traditional Pb alloy anode, the Pb-Al layered composite anode showed a more uniform current distribution performance.

关键词： Composite materials

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Studies on preparation of Cr2O3-graphite intercalation compounds by vacuum heat-treatment

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Cailiao Rechuli Xuebao/Transactions of materials and Heat Treatment 2011年第SUPPL.期32卷 9-12页

作者： Zhang, Yan Xu, Bing-She Key Lab. of Interface Science and Engineering in Advanced Materials of Taiyuan University of Tech. Taiyuan 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

Cr2O3-graphite intercalation compounds (GICs) were prepared using graphite and CrO3 as raw materials by vacuum heat-treatment. The stage 5 GICs was formed after heat treatment at 1400°C when the content of graphite and CrO3 is equal, and it was examined and characterized by X-ray diffraction (XRD). The XRD analysis of intercalation compounds indicated that a number of non-carbon reactant (Cr2O3) could intercalate the layers of graphite with reticulated layer structure by vacuum heat-treatment. Consequently the layered structure of graphite changed. X-ray photoelectron spectroscopy (XPS) suggested that the compound intercalated into graphite should contain Cr(sh) compound.

关键词： X ray diffraction

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Preparation of carbon nanocapsules containing nickel and carbon fibers

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Cailiao Rechuli Xuebao/Transactions of materials and Heat Treatment 2011年第10期32卷 19-21页

作者： Yu, Jun Xu, Bing-She College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Key Lab. of Interface Science and Engineering in Advanced Materials of Taiyuan University of Tech. Ministry of Education Taiyuan 030024 China

Carbon fibers (CFs) were prepared from deoiled asphalt (DOA) by chemical vapor deposition (CVD). Furthermore, nickel-containing carbon nanocapsules (CNCs) were obtained by vacuum heat-treatment using the residual coke from previous experiment as carbon source and nickel powder as catalyst. The morphology and structure of the products were characterized by field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and raman spectroscopy. Results show that high purity and hollow core structure carbon fibers with diameters ranging from 200-500 nm are obtained, and the nickel-containing CNCs with size of 5-30 nm exhibit obvious core-shell structure with nickel as cores and carbon as shells. Carbon shells surrounding the metal particles may offer excellent protection to the encapsulated metal nanomaterials.

关键词： Heat treatment

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Preparation of different micro-structural cuprous oxide by solvothermal method

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Gongneng Cailiao/Journal of Functional materials 2011年第SUPPL. 5期42卷 794-798页

作者： Liang, Jian Dong, Hai-Liang Zhao, Jun-Fu Ma, Shu-Fang Key Lab. of Interface Science and Eng. in Advanced Materials of Taiyuan Univ. of Technology Taiyuan 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

Cuprous oxide particles with a spherical diameter of about 2 to 3 μm and octahedron size of 4 μm were synthesized by a solvothermal method using copper acetate as raw materials. The effects of different reaction conditions, including temperatures, solvents, ratios of raw materials, and adding surfactant cetyltrimethylammonium bromide (CTAB), on crystal structure and morphology of micron cuprous oxide have been systematically investigated by choosing different reductants, and the optimum condition for preparing spherical and octahedral cuprous oxide has been obtained. The growth mechanism of micron cuprous oxide particles is discussed and supposed.

关键词： Copper oxides

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Effect of amount of cetyltrimethylammonium bromide on morphologies of PbS in microwave synthetic systems

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Gongneng Cailiao/Journal of Functional materials 2011年第SUPPL. 3期42卷 460-463页

作者： Liang, Jian Wei, Zhao-Ling Li, Tian-Bao Zhao, Jun-Fu Li, Jing Xu, Bing-She Key Lab. of Interface Science and Engineering in Advanced Materials of Taiyuan Univ. of Technology Ministry of Education Taiyuan 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Department of Physics College of Science Taiyuan University of Technology Taiyuan 030024 China

In two microwave synthetic systems, the effect of CTAB on morphologies of PbS materials was studied and preparation of optimal conditions for both star-shaped and flower-like structure were obtained respectively. The results indicated that under the influence of CTAB, the PbS materials with different morphology were obtain. In former system, PbAc2 · 3H2O was used as lead source, thiourea as sulfur source, DMSO as solvent. With decreasing of the amount of CTAB (0, 0.05, 0.1g), a star-like structure with smooth surface, nano-dendritic structure and perfect star-like structure were formed sequentially. For latter system in which Pb(NO3)2 as lead source, L-cysteine as sulfur source, deionized water as solvent, a flower-like structure was obtained when CATB was set up 0.05g;without CATB the sheet structure and partial cube were observed;however, when the addition of CTAB is 0.025g, we can not see absolute flower structure but the result showed a tendency to assemble flower structure. Meanwhile, combining experiments and literatures, the formation mechanisms of PbS with star-shaped and flower-like structure were discussed.

关键词： Morphology

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Preparation and characterization of composites of Eu-Tb complex/methacrylate-type polymer

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Gongneng Cailiao/Journal of Functional materials 2009年第10期40卷 1601-1605页

作者： Li, Jie Huang, Li-Feng Li, Ying-Chun Xu, Bing-She College of Materials Science and Engineering North University of China Taiyuan 030051 China Key Lab. of Interface Science and Engineering in Advanced Materials of TYUT Ministry of Education College of Materials Science and Engineering of Taiyuan University of Technology Taiyuan 030024 China

In this paper, a series of composites of Eu-Tb rare-earth complex/methacrylate-type polymer, namely EuxTb1-x (TTA)(Phen)-P(MMA-co-MAA) (x=1, 0.75, 0.5, 0.25, 0), were prepared with different ratios of Tb3+ by in-situ synthesis. The structure and microscopic morphology of EuxTb1-x (TTA)(Phen)-P(MMA-co-MAA) were characterized by FT-IR spectra and SEM images. The optical gap and photoluminescent properties were investigated by UV-vis absorption spectra and photoluminescent spectra. The results indicated that EuxTb1-x (TTA)(Phen)-P(MMA-co-MAA) could emit mostly characteristic fluorescence of europium ion and intense red fluorescence with peak wavelength at 613 nm under UV excitation at 365 nm. Photoluminescent intensity of them was found to be influenced with the content of MAA and Tb3+. It was demonstrated that EuxTb1-x (TTA)(Phen)-P(MMA-co-MAA) were excellent red photoluminescent composites of rare-earth complex/methacrylate-type polymer.

关键词： Terbium compounds

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Synthesis and luminescent properties of Eu0.5Tb0.5 (TTA)3 Bipy/PMMA

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Gongneng Cailiao/Journal of Functional materials 2008年第4期39卷 684-686+689页

作者： Li, Jie Li, Ying-Chun Xie, Jiang-Bo Xu, Bing-She College of Materials Science and Engineering North University of China Taiyuan 030051 China Key Lab. of Interface Science and Engineering in Advanced Materials TYUT Taiyuan 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

In this paper, Eu0.5Tb0.5 (TTA)3 Bipy was synthesized and Eu0.5Tb0.5 (TTA)3 Bipy/PMMA was prepared by in-situ polymerization. The structure of Eu0.5Tb0.5 (TTA)3 Bipy/PMMA was characterized by FT-IR spectra. Microscopic morphology and photoluminescent properties were investigated by SEM photographs and fluorescence spectra. The results indicated that Eu0.5Tb0.5 (TTA)3 Bipy/PMMA could emit mostly characteristic fluorescence of europium ion and intense red fluorescence with peak wavelength at 612 nm and bandwidth of 10.4 nm (purity: 0.9908) under UV excitation at 365 nm. It was demonstrated that Eu0.5Tb0.5 (TTA)3 Bipy/PMMA was an excellent red photoluminescent rare-earth polymer material.

关键词： Luminous materials

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