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Polyol-mediated syntheses and characterizations of NaYF₄, NH₄Y₃F₁₀ and YF₃ nanocrystals/sub-microcrystals

MATERIALS RESEARCH BULLETIN 2008年第8-9期43卷 2130-2136页

作者： Qin, Ruifei Song, Hongwei Pan, Guohui Hu, Lanying Yu, Hongquan Li, suwen Bai, Xue Fan, Libo Dai, Qilin ren, Xinguang Zhao, Haifeng Wang, Tie Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Key Lab Excited State Phys Changchun Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

In this paper, NaYF4 nanocrystals and NH4Y3F10 sub-microcrystals were prepared using a polyol method. After being annealed, NH4Y3F10 can convert into YF3, which is a very efficient host matrix for upconversion. The structures of obtained NaYF4, NH4Y3F10 and YF3 samples are pure cubic phase, a mixture of cubic and hexagonal phase and pure orthorhombic phase, respectively. The size of obtained NaYF4 nanocrystals is about 20 nm, and those of NH4Y3F10 and YF3 sub-microcrystals are both about 200 nm. When co-doped with Er3+ and Yb3+, NaYF4 and YF3 samples can emit bright light under 978 nm excitation. Upconversion mechanisms in Yb3+/Er3+ co-doped NaYF4 and YF3 samples were discussed. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： fluorides nanostructures luminescence

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In vivo Photoacoustic Molecular Imaging with Simultaneous Multiple Selective Targeting Using Antibody-Conjugated Gold Nanorods

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OPTICS EXPRESS 2008年第23期16卷 18605-18615页

作者： Li, Pai-Chi Wang, Churng-ren Chris Shieh, Dar-Bin Wei, Chen-Wei Liao, Chao-Kang Poe, Carolina Jhan, suwen Ding, Ann-Ann Wu, Ya-Na Natl Taiwan Univ Grad Inst Biomed Elect & Bioinformat Taipei 106 Taiwan Natl Taiwan Univ Dept Elect Engn Taipei 106 Taiwan Natl Chung Cheng Univ Dept Chem & Biochem Chiayi 621 Taiwan Natl Cheng Kung Univ Inst Mol Med Tainan 701 Taiwan Natl Cheng Kung Univ Inst Oral Med Tainan 701 Taiwan

The use of gold nanorods for photoacoustic molecular imaging with simultaneous multiple targeting is reported. Multiple targeting is done by utilizing the tunable optical absorption property of gold nanorods. This technique allows multiple molecular signatures to be obtained by simply switching laser wavelength. HER2 and EGFR were chosen as the primary target molecules for examining two cancer cells, OECM1 and Cal27. Both in vitro and in vivo mouse model imaging experiments were performed, with contrast enhancement of up to 10dB and 3.5dB, respectively. The potential in improving cancer diagnosis is demonstrated. (c) 2008 Optical Society of America

关键词： Imaging techniques Laser irradiation Molecular imaging Molecular probes Photoacoustic imaging Small animal imaging

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Preparation, Characterization and Photoluminescence Properties of Ternary Europium Complexes Eu(DBM)₃bath Encapsulated into Aluminosilicate Zeolites

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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2008年第8期8卷 3959-3966页

作者： Liu, Huihui Song, Hongwei Li, suwen ren, Xinguang Lu, Shaozhe Yu, Hongquan Pan, Guohui Zhang, Hui Hu, Lanying Dai, Qilin Qin, Ruifei Yu, Jihong Wang, Guangmei Jiang, Jiuxing 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 Jilin Univ Coll Chem State Key Lab Inorgan Synth & Preparat Chem Changchun 130012 Peoples R China

To modify the photoluminescence properties the Eu(DBM)(3)bath complexes were encapsulated into the sub-nanometer pores of aluminosilicates zeolites L and Y and characterized by X-ray diffraction (XRD), transmission electron micrographs (TEM), Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible (UV-vis) absorption spectra. The luminescent properties of the encapsulated composites (Eu-L and Eu-Y) were systematically studied. The results indicate that in both the two composites the crystal-field symmetry becomes lower, as a consequence, the D-5(0)-F-7(2) electronic-dipole transition relative to the ID.-IF, magnetic-dipole transition of Eu3+ increases in contrast to the pure complexes. The outer quantum efficiency of the Eu3+ emission and the photostability of Eu3+ are both improved considerably. The adsorption of water in the composites has influence on the thermostability and decay dynamics of the Eu3+ emission. In the composite Eu-L, which contains less water the thermostability of luminescence is improved considerably and the lifetime becomes longer in comparison to the pure complexes. Overall, zeolite L is a more ideal host material for modification of lanthanide complexes.

关键词： Eu(DBM)(3)bath Aluminosilicate Zeolites Composites Photoluminescence

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A jitter attenuating timing chain

A jitter attenuating timing chain

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13th IEEE International Symposium on Asynchronous Circuits and Systems

作者： Yang, suwen Greenstreet, Mark R. ren, Jihong

ISBN: (纸本)9780769527710

A long chain of inverters and wire segments will amplify clock jitter and drop timing pulses due to intersymbol interference. We present a jitter attenuating buffer based on surfing techniques. Our buffer circuit consists of a few inverters with variable output strength that implement a simple, low-gain DLL. Chains of these surfing buffers attenuate jitter making them well suited for source-synchronous interfaces. Furthermore, our chains can be used to reliably transmit handshaking signals and support sliding-window protocols to improve the throughput of asynchronous communication.

关键词： Jitter

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Synthesis and optical properties of Pb-doped Srs(PO₄)₃Cl nanorods

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JOURNAL OF ALLOYS AND COMPOUNDS 2007年第1-2期441卷 219-221页

作者： Xiu, Zhiliang Liu, suwen Xu, Fengxiu ren, Min Pan, Tie Cui, Xiaopeng Yu, Weina Yu, Jiaoxian Shandong Inst Light Ind Dept Mat Sci & Engn Jinan 250353 Peoples R China

Pb-doped Sr-5(PO4)(3)Cl nanocrystals with rod-like structures were synthesized by a simple precipitation method. The nanorods had diameters of similar to 50 nm and lengths of 150-350 nm observed by transmission electron micrograph (TEM). The photoluminescence spectra revealed that a strong red emission at 725 nm was ascribed to Pb-related charge-transfer transition. The luminescence intensities were strongly dependent on the concentration of Pb 21 ions. (C) 2006 Published by Elsevier B.V.

关键词： nanorods precipitation photoluminescence

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Highly luminescent YVO₄-Eu³⁺ nanocrystals coating on wirelike Y(OH)₃-Eu³⁺ and Y₂O₃-Eu³⁺ microcrystals by chemical corrosion

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JOURNAL OF PHYSICAL CHEMISTRY C 2007年第33期111卷 12472-12477页

作者： Pan, Guohui Song, Hongwei Bai, Xue Fan, Libo Yu, Hongquan Dai, Qilin Dong, Biao Qin, Ruifei Li, suwen 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 100039 Peoples R China

Highly luminescent YVO4-Eu3+ nanocrystals (NCs) coating on wirelike Y(OH)(3)-Eu3+ and Y2O3-Eu3+ microcrystals were synthesized by a chemical corrosion method, that is, first preparation of Y(OH)(3)-Eu3+ wirelike microcrystals by a hydrothermal method, and subsequently chemical corrosion with NaVO4 solutions through a second hydrothermal treatment. The crystal structure, morphology, and optical properties of the composites were characterized and compared with those of the general nanoparticles (NPs) obtained by a one-step hydrothermal process. The results indicate that chemical corrosion method yields high-quality YVO4-Eu3+ NCs in the composite grown from exterior to interior, compared with the directly hydrothermal NPs grown from interior to exterior. In addition, luminescent intensity for YVO4-Eu3+ in the composite was remarkably increased compared with that of NPs, due to more efficient energy transfer from VO43- to Eu3+ ions, and was further increased up to level of the the bulk materials after being annealed at 500 degrees C for 2 h. The local environment surrounding Eu3+ in the composite is more complex due to the presence of corrosive interface.

关键词： Electrochemistry Luminescence Composites Ions Oxidation

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

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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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A Jitter Attenuating Timing Chain

A Jitter Attenuating Timing Chain

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International Symposium on Advanced Research in Asynchronous Circuits and Systems

作者： suwen Yang Mark R. Greenstreet Jihong ren Canada Intel

关键词： Timing jitter Wire Clocks Pulse amplifiers Pulse inverters Intersymbol interference Circuits Protocols Throughput Asynchronous communication

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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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