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Electrospinning preparation and photoluminescence properties of rare-earth complex/polymer composite fibers

JOURNAL OF PHYSICAL CHEMISTRY C 2007年第17期111卷 6524-6527页

作者： Zhang, Hui song, Hongwei Yu, Hongquan Bai, Xue Li, suwen Pan, Guohui Dai, Qilin Wang, Tie Li, Wenlian Lu, Shaozhe Ren, Xinguang Zhao, Haifeng Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Key Lab Excited State Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 10039 Peoples R China

Composite fibers of poly(vinyl pyrrolidone) (PVP, M-w approximate to 1 300 000) and europium complex Eu(BA)(3)(TPPO)(2) (BA =1-benzoylacetone;TPPO = triphenylphosphine oxide) with strong photoluminescence were prepared by electrospinning. Their luminescent properties were studied in comparison to that of the pure complex. The results indicate that due to decreased symmetry in the composites the excitation bands are split into two different components, peaking at similar to 246 and similar to 336 nm, respectively, while the ratio of the electronic dipole D-5(0)-F-7(2) transitions to the magnetic dipole D-5(0)-F-7(1) ones in the emission spectra becomes a little larger. The room temperature fluorescence lifetime for the D-5(0) level becomes shorter due to increased radiative and nonradiative transition rates. The temperature dependence of photoluminescence was investigated under 325-nm excitation. It is interesting to observe that in the composite fiber the total emission intensity of the Eu3+ ions changes little below 150 K, while in the pure complex the intensity decreases monotonically with increasing temperature. In addition, the composite fibers exhibit better photostability exposed to ultraviolet lights. These novel luminescent composite fibers have potential application in nanodevices.

关键词： Photoluminescence Fibers Composites Fluorescence Ions

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Fabrication and photoluminescent properties of Gd₂O₃ : Eu³⁺ nanowires in AAO template

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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2007年第2期7卷 474-480页

作者： Li, suwen song, Hongwei Yu, Lixin Liu, Zhongxin Pan, Guohui Yu, Hongquan Dai, QiLin Fan, Libo Lei, Yanqiang Wang, Tie Ren, Xinguang Lu, Shaozhe Zhao, Haifeng Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Key Lab Excited State Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

Uniform Gd2O3 : Eu3+ nanowires were fabricated by using anodic aluminum oxide template (AAO). The spectral measurements indicate that with the increasing annealing temperature the excitation band of Eu3+ in Gd2O3 : Eu3+ nanowires/AAO shifted blue, the intensity ratio of D-5(0)-F-7(2) to D-5(0)-F-7(1) decreased, and the lifetime became longer. In the sample annealed at 1000 C two spectral components, the sharper and broader lines were identified, corresponding to two different local environments, the Eu3+ ions in cubic phase and in amorphous phase, respectively. The D-5(0)-F-7(1), transitions of Eu3+ ions in cubic phase had longer lifetime than that in amorphous phase. In contrast to the lifetime of the D-5(0)-F-7(J) transitions in the bulk, that in Gd2O3 : Eu3+/AAO composite films increased due to influence of the surrounding media (AAO).

关键词： nanowires AAO template annealing local environments photoluminescence characteristics

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Modified photoluminescence properties of rare-earth complex/polymer composite fibers prepared by electrospinning

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APPLIED PHYSICS LETTERS 2007年第10期90卷 103103-103103页

作者： Zhang, Hui song, Hongwei Yu, Hongquan Li, suwen Bai, Xue Pan, Guohui Dai, Qilin Wang, Tie Li, Wenlian Lu, Shaozhe Ren, Xinguang Zhao, Haifeng Kong, Xianggui Chinese Acad Sci Key Lab Excited State Phys Changchun Inst Opt Fine Mech & Phys Changchun 130033 Peoples R China

Efficiently luminescent composite fibers of poly (vinyl pyrrolidone) (M-w approximate to 1 300 000) and europium complex Eu(TTA)(3)(TPPO)(2) (TTA is thenoyltrifluoroacetone;TPPO is triphenylphosphine oxide) were prepared by electrospinning, with average diameters of 200-500 nm and lengths of several tens of micrometers. Their photoluminescence properties were studied in comparison to the pure Eu(TTA)(3)(TPPO)(2) complex. It was significant to observe that the thermal stability of photoluminescence in the composite fibers was improved considerably over the pure complex. (c) 2007 American Institute of Physics.

关键词： Electrodeposition Photoluminescence Fluorescence Refractive index Europium

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Novel energy-transfer route and enhanced luminescent properties in YVO4:Eu³⁺/YBO₃:Eu³⁺ composite

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CHEMISTRY OF MATERIALS 2006年第18期18卷 4526-4532页

作者： Pan, Guohui song, Hongwei Bai, Xue Liu, Zhongxin Yu, Hongquan Di, Weihua Li, suwen Fan, Libo Ren, Xinguang Lu, Shaozhe Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Key Lab Excited State Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

In this paper, YVO4: Eu3+/YBO3:Eu3+ composite was fabricated by chemical corrosion through a two-step hydrothermal process, i.e., first preparation of YBO3:Eu3+ nanocrystals and subsequent chemical corrosion by Na3VO4 solution. A novel energy-transfer and luminescent route via UV and VUV excitation was identified (YBO3 phase -> YVO4 phase -> Eu3+ ions in the YVO4 phase), which remained in the sample annealed at high temperature. In this composite high quantum yield was maintained, and considerably improved color purity was induced. A corrosive interface between the YVO4: Eu3+ and YBO3: Eu3+ phases was identified by the site-selective excitation technique, where the local environment surrounding Eu3+ was extremely complex. It is believed that, through further optimization, this novel composite can be candidate phosphors for red PDPs and Hg-free fluorescent lamp in the future.

关键词： Composites Energy transfer Ions Physical and chemical processes Nanocrystals

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Improved photoluminescence properties of ternary terbium complexes in mesoporous molecule sieves

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JOURNAL OF PHYSICAL CHEMISTRY B 2006年第46期110卷 23164-23169页

作者： Li, suwen song, Hongwei Li, Wenlian Ren, Xinguang Lu, Shaozhe Pan, Guohui Fan, Libo Yu, Hongquan Zhang, Hui Qin, Ruifei Dai, QiLin Wang, Tie Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Key Lab Excited State Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Changchun 130033 Peoples R China

Ternary terbium complexes were fully encapsulated and uniformly distributed into the channels of unmodified and modified mesoporous molecule sieves of SBA-15 and characterized by transmission electron micrographs (TEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-vis) absorption spectra, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and elemental analysis. The luminescent properties for the encapsulated complexes were systematically studied in contrast to the pure complexes, including excitation and emission spectra, fluorescence dynamics, photostability under UV exposure, and the temperature dependence of intensity and lifetime. The results indicate that the excitation bands assigned to the pi-pi* electron transition of the ligands for Tb complexes encapsulated in SBA- 15 were split into different components due to decreased symmetry and disappeared at long wavelengths. Owing to suppressed vibration transitions, the outer quantum efficiency of the D-5(4)-F-7(J) (J=0-5) emissions was enhanced largely in comparison to the pure complexes. In addition, the photostability and thermostability of the emissions were also improved considerably.

关键词： TERBIUM PHOTOLUMINESCENCE TRANSMISSION electron microscopy FOURIER transform infrared spectroscopy

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Solvothermal synthesis and photoluminescent properties of ZnS/cyclohexylamine: Inorganic-organic hybrid semiconductor nanowires

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JOURNAL OF PHYSICAL CHEMISTRY B 2006年第26期110卷 12948-12953页

作者： Fan, Libo song, Hongwei Zhao, Haifeng Pan, Guohui Yu, Hongquan Bai, Xue Li, suwen Lei, Yanqiang Dai, Qilin Qin, Ruifei Wang, Tie Dong, Biao Zheng, Zhuhong Ren, Xinguang Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Key Lab Excited State Phys Changchun 1330033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

An inorganic-organic hybrid semiconductor, ZnS/CHA (CHA = cyclohexylamine) nanocomposites was successfully synthesized via a solvothermal method using CHA as solvent, which yielded uniform and ultralong nanowires with widths of 100-1000 nm and lengths of 5-20 mu m. Changing the reaction conditions could alter the morphology and optical properties of the nanocomposites. The periodic layer subnanometer structures were identified by high-resolution transmission electron microscopy (HR-TEM) images, with thickness of similar to 2 nm. The composites exhibited a very large blue-shift in their optical absorption edge as well as an exciton excitation band due to a strong quantum confinement effect caused by the internal subnanometer-scale structures. The pure hexagonal wurtzite ZnS nanowires were also obtained by extracting the ZnS/CHA nanocomposites with dimethyl formamide (DMF). In addition, the luminescent properties of exciton and defect-related transitions in different samples of ZnS/CHA were discussed in detail.

关键词： NANOSTRUCTURED materials NANOWIRES ELECTRON microscopy TRANSMISSION electron microscopy

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Novel Energy-Transfer Route and Enhanced Luminescent Properties in YVO4:Eu3+/YBO3:Eu3+Composite.

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ChemInform 2006年第47期37卷

作者： Guohui Pan Hongwei song Xue Bai Zhongxin Liu Hongquan Yu Weihua Di suwen Li Libo Fan Xinguang Ren Shaozhe Lu Key Lab. Excited-State Processes Changchun Inst. Opt. Fine Mech. Phys. Chin. Acad. Sci. Changchun 130033 Peop. Rep. China

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

关键词： luminescence, fluorescence (solids and liquids) display technology, phosphors, liquid crystals yttrium, Y europium, Eu vanadium, V boron, B

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meso-5,10,15,20-四(取代-2-噻吩基)卟啉及其配合物的合成与表征

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有机化学 2003年第6期23卷 588-594页

作者：李忠芳王素文宋文生邓会宁王亚权王宇新天津大学化工学院天津300072 山东理工大学科技研究院淄博255012 天津大学碳一化学与化工国家重点实验室天津300072

用混合溶剂法合成了中位噻吩基取代的卟啉化合物 :meso 四 ( 2 噻吩基 )卟啉 ,meso 四 ( 4 溴 2 噻吩基 )卟啉和meso 四 ( 3 甲基 2 噻吩基 )卟啉 ,产率达到 3 6.5 %～ 3 9.3 % ,考察了溶剂的配比、反应温度、反应时间等因素对... 详细信息

用混合溶剂法合成了中位噻吩基取代的卟啉化合物 :meso 四 ( 2 噻吩基 )卟啉 ,meso 四 ( 4 溴 2 噻吩基 )卟啉和meso 四 ( 3 甲基 2 噻吩基 )卟啉 ,产率达到 3 6.5 %～ 3 9.3 % ,考察了溶剂的配比、反应温度、反应时间等因素对反应的影响 ,其最佳反应条件为 :溶剂配比 :丙酸∶乙酸∶硝基苯 =2∶2 (or 3 )∶1;反应温度 :13 0～ 14 0℃ ;反应时间 :5 0～ 60min .研究了利用固相合成法合成上述卟啉化合物与过渡金属盐形成配合物的配位反应 ,在 40℃利用固相合成法合成了卟啉化合物与Fe2 + ,Fe3 + ,Co2 + ,Ni2 + ,Mn2 + 等过渡金属离子形成的配合物 ,产率为 81.1%～ 87.6% .利用元素分析 ,UV vis ,IR ,1HNMR ,HRMS对卟啉化合物及其配合物进行了表征 ,利用TG DTA研究了它们的热稳定性 ,利用EPR研究了它们的顺磁性 .

关键词： meso-5,10,15,20-四〔取代-2-噻吩基)卟啉金属配合物合成表征混合溶剂法固相合成法

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安胃降逆饮对大鼠胃功能的影响

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河北医科大学学报 2000年第4期21卷 202-204页

作者：宋建徽孟祥琴苏素文郭鸣放王川苗庆峰任雷鸣河北医科大学基础医学院药理学教研室石家庄050017

目的观察安胃降逆饮对胃功能的影响 ,分析其镇吐作用机制。方法采用大鼠离体胃条法测定胃条张力 ,小鼠酚红排空试验法测定胃排空量和 0 .1mol/LNaOH滴定法测定胃酸含量。结果安胃降逆饮对大鼠胃肌的基础张力和乙酰胆碱引起的痉挛性收缩... 详细信息

目的观察安胃降逆饮对胃功能的影响 ,分析其镇吐作用机制。方法采用大鼠离体胃条法测定胃条张力 ,小鼠酚红排空试验法测定胃排空量和 0 .1mol/LNaOH滴定法测定胃酸含量。结果安胃降逆饮对大鼠胃肌的基础张力和乙酰胆碱引起的痉挛性收缩有明显抑制作用 (P <0 .0 1) ;对小鼠胃排空 ,大鼠胃液量 ,胃液酸度及总酸度无明显影响 (P >0 .0 5 )。结论安胃降逆饮的镇吐作用至少部分是通过抑制胃肠平滑肌蠕动而发挥作用的。

关键词：胃肠活动安胃降逆饮胃排空胃功能实验研究

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安胃降逆饮的镇吐作用研究

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河北医科大学学报 1999年第6期20卷 329-330页

作者：宋建徽孟祥琴苏素文郭鸣放王川苗庆峰任雷鸣河北医科大学基础医学院药理学教研室石家庄050017

目的观察安胃降逆饮的镇吐作用，分析其作用机制。方法分别采用家鸽硫酸铜致吐模型及犬去水吗啡致吐模型，以观察呕吐潜伏期及呕吐频率。结果安胃降逆饮对硫酸铜引起的家鸽呕吐有明显的镇吐作用；对盐酸去水吗啡引起的犬呕吐无效。结... 详细信息

目的观察安胃降逆饮的镇吐作用，分析其作用机制。方法分别采用家鸽硫酸铜致吐模型及犬去水吗啡致吐模型，以观察呕吐潜伏期及呕吐频率。结果安胃降逆饮对硫酸铜引起的家鸽呕吐有明显的镇吐作用；对盐酸去水吗啡引起的犬呕吐无效。结论安胃降逆饮对直接刺激胃粘膜引起的呕吐有抑制作用。

关键词：呕吐中医药疗法安胃降逆饮

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