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| 1 | Luminescence of Er^(3+) in Oxyfluoride Transparent Glass-Ceramics显示文摘Erbium doped silicate, germanate, and tellurium-germanate oxyfluoride glasses were prepared in a bulk form. Through appropriate heat treatment of the as-prepared glasses, transparent glass-ceramics (TGCs) were obtained with the formation of β-PbF2∶Er 3+ nanocrystals in the glass matrix were confirmed by X-ray diffraction. Well-defined diffraction peaks were observed in the samples after heat-treatment. The average crystal diameter of these precipitated crystals from full-width at half-maximum (FWHM) of the diffraction peak was estimated to be between 8 and 13 nm. Optical absorption, photoluminescence, and upconversion luminescence were measured on as-prepared glass and glass-ceramics. Luminescence spectra in the TGC samples revealed well-resolved, sharp stark-splitting peaks, which indicates that a majority of Er 3+ ions has been incorporated into the crystalline phase of the nanocrystals. The intensity of the visible and near infrared luminescence mostly increases in TSG compared to that in the as-prepared glass. In 1.53 μm absorption and emission bands, the maximum absorption peak is blue-shifted from 1531 to 1507 nm, whereas the maximum emission peak is red-shifted from 1535 to 1543 nm in TGC, as compared with that in glass. The bandwidth at half-maximum (BWHM) of the emission band is significantly broader in TGC than in glass, which is beneficial to the erbium-doped fiber amplifier (EDFA). Upconversion luminescence was measured using 800 nm near-infrared light excitation. Drastically increased upconversion luminescence was observed from the TGC as compared to that from their corresponding as-prepared glasses. In addition to a strong green emission centered at 545 nm because of 4S 3/2 →4I 15/2 transition and a weaker red emission centered at 662 nm because of 4F 9/2 →4I 15/2 transition, generally seen from the Er 3+ doped glasses, two violet emissions centered at 410 nm because of 2H 9/2 →4I 15/2 transition and centered at 379 nm because of 4G 11/2 →4I 15/2 transition were also observed from the TGC. The increased luminescence was attributed to the decreased effective phonon energy and the increased energy transfer between the excited ions when Er 3+ ions were incorporated into the precipitated β-PbF2 nanocrystals. The results indicated two attractive spectroscopic properties of the Er 3+ doped TGC samples, compared to glass samples, namely a reduced multiphonon decay rate and a reduced inhomogeneous broadening. In addition, these oxyfluoride TGC materials were robust, easy and flexibile to process, and possible to be fabricated in the fiber form for device applications. | Akira Ueda Steven H Morgan Richard Mu | 2006 | Journal of Rare Earths2006，24，6： | 7 |
| 2 | Development of computer-aided process planning system for plate bending by line heating (report 4): Decision making on heating conditions, location and direction显示文摘 | UEDA Y MURAKAWA H MOHAMED A OKUMOTO Y | 1993 | Transaction JWRI1993，22，2： | 1 |
| 3 | In vitro and in vivo release of vas~:ular endothelial growth factor from gelatin microparticles and biodegradable composite scaffolds 显示文摘 | Patel ZS Ueda H Yamamoto M | 2008 | Pharm Res2008，25，10： | 1 |
| 4 | Microbial Production of D-Malate from Maleate显示文摘 | Ueda M Yamasa H | 1993 | Environ Microbio1993，59，： | 1 |
| 5 | Photocatalytic O2 evolution under visible light irradiation on BiVO4 in aqueous AgNO3 solution 显示文摘 | Kudo A Ueda K Kato H Mikami I | 1998 | Catal Lett1998，，53： | 1 |
| 6 | Yeast coactivator MBF1 mediates GCN4-dependent transcriptional activation显示文摘 | TAKEMARU K I HARASHIM S UEDA H | 1998 | Molecular Cell Biology1998，18，9： | 1 |
| 7 | Changes in presynaptic proteins,SNAP-25 and synaptophysin,in the hippocampal CAI area in ischemic gerbils显示文摘 | Ishimaru H Casamenti F Ueda K | 2001 | Brain Res2001，903，12： | 1 |
| 8 | Protection against bleomycin-induced lung injury by IL-18 in mice 显示文摘 | Nakatani-okuda A Ueda H Kashiwamura S | 2005 | AM J Physiol Lung Cell Mol Physiol2005，289，2： | 1 |
| 9 | Ascending fractional pulse pressure closely relating to large artery function显示文摘 | Nakayama Y Ueda H Tsumura K | 2002 | J Hypertens2002，16，4： | 1 |
| 10 | Isolation,Purification,and Characterization of Cyclomaltodecaose (ε-cyclodextrin),Cyclomaltoundecaose (ζ-cyclodextrin) and Cyclomaltotridecaose (θ-cyclodextrin)显示文摘 | Endo T Nagase H Ueda H | 1997 | Chem Pharm Bull1997，45，： | 1 |
| 11 | Effect of chymase inhibition on the arteriovenous fistula stenosis in dogs显示文摘 | Jin D Ueda H Takai S | 2005 | J Am Soc Nephrol2005，16，4： | 1 |
| 12 | Radiologic manifestationgs of sarcoidosis in various organs显示文摘 | Koyama T Ueda H Togashi K | 2004 | Radiographics2004，24，： | 1 |
| 13 | Diurnal T2 value changes in the lumba intervertebral Discs 显示文摘 | Karakida O Ueda H Ueda M | 2003 | Clin Radiol2003，58，5： | 1 |
| 14 | Modified two-layer preservation method (M-Kyoto/PFC) improves islet yields in islet isolation显示文摘 | Noguchi H Ueda M Nakai Y | 2006 | Am J Transplant2006，6，3： | 1 |
| 15 | Preparation of nitrogendoped titanium oxide thin film using a PLD method as parameters of target material and nitrogen concentration ratio in nitrogen-oxygen gas mixture显示文摘 | SUDA Y KAWASAKI H UEDA T | | 0，，02： | 1 |
| 16 | Catalytic nydrocracking of phenanthrene over NiMo/Ale03, 2oMo/A12Oa catalysts and metal-loaded Y-zeolites显示文摘 | UEDA K MATSUI H SONG C S | 1990 | [ournal of the Japan Petroleum Institute1990，33，6： | 1 |
| 17 | Influence of bacterial extracellular polymers on the membrane separation activated sludge process 显示文摘 | Nagaoka H Ueda S Miya A | 1996 | Water Science and Technology1996，34，9： | 1 |
| 18 | IL-6-gp130-STAT3 in T cells directs the development of IL-17^+ Th with a minimum effect on that of Treg in the steady state 显示文摘 | Nishihara M Ogura H Ueda N | 2007 | Int Immunol2007，19，6： | 1 |
| 19 | Biodegradable gelatin microparticles as delivery systems for the controlled release of bone morphogenetic protein-2 显示文摘 | Patel ZS Yamamoto M Ueda H | 2008 | Acta Biomater2008，4，5： | 1 |
| 20 | Influence of bacterial extracellular polymers on the membrane separation activated sludge process 显示文摘 | Nagaoka H Ueda S Miya A | 1996 | WaterSciTechnol1996，34，9： | 1 |
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