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The theory and experiment of solute migration caused by excited state absorptions

Chinese Physics B 2010年第1期19卷 382-387页

作者：金肖王玉晓税敏李常伟杨俊义张学如杨昆宋瑛林 Department of Physics Soochow University Department of Physics Harbin Institute of Technology

Nonsymmetrical transition from reverse-saturable absorption （RSA） to saturable absorption （SA） caused by excited state absorption induced mass transport of the CuPcTs dissolved in dimethyl sulfoxide is observed in an open aperture Z-scan experiment with a 21-ps laser pulse. The nonsymmetrical transition from RSA to SA is ascribed neither to saturation of excited state absorption nor to thermal induced mass transport, the so-called Sorer effect. In our consideration, strong nonlinear absorption causes the rapid accumulation of the non-uniform kinetic energy of the solute molecules. The non-uniform kinetic field in turn causes the migration of the solute molecules. Additionally, an energy-gradient-induced mass transport theory is presented to interpret the experimental results, and the theoretical calculations are also taken to fit our experimental results.

关键词： solute migration excited state absorption energy-gradient

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Upconversion Luminescence of SrTiO3：Er^3＋ Ultrafine Powders Produced by 785 nm Laser

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Chinese Journal of Chemical Physics 2008年第3期21卷 233-238页

作者： Hai Guo Yan-min Qiao Ju-fang Zheng Lei-hong Zhao Department of Physics Zhejiang Normal University Jinhua 321004 China Zhejiang Key Laboratory for Reactive Chemistry on 5olicl Surfaces Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 China

Er^3＋ doped SrTiO3 ultrafine powders were prepared by solid state reaction in a molten NaCl flux. The structural properties were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The Stokes emission spectra of Er^3＋ in SrTiO3：Er^3＋ ranging from green to near infrared region were investigated under 514.5 nm laser excitation. The green and red upconverted luminescence spectra of Er^3＋ were measured under excitation into the 419/2 level by 785 nm laser. The upconversion mechanisms were studied in detail through laser power dependence and Er^3＋ ion concentration dependence of upconverted emissions, and results show that excited state absorption and energy transfer process are the possible mechanisms for the upconversion. The upconversion properties indicate that SrTiO3：Er^3＋ may be used in upconversion phosphors.

关键词： SrTiO3 Upconversion luminescence excited state absorption Energy transfer

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Upconversion of Er^(3+) Ions in LiKGdF_5:Er^(3+),Dy^(3+) Single Crystal Produced by Infrared and Green Laser

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Journal of Rare Earths 2006年第6期24卷 740-744页

作者：郭海尹民张慰萍 Department of Physics Zhejiang Normal University Jinhua 321004 ChinaZhejiang Key Laboratory for Reactive Chemistry on Solid SurfacesInstitute of Physical Chemistry Zhejiang Normal University Jinhua 321004China Department of Physics University of Science and Technology of ChinaHefei 230026 China

The upconversion fluorescence of Er^3＋ ions in LiKGdF5 ： Er^3＋, Dy^3＋ single crystal was studied under 785, 514.5, and 980 nm laser excitation. With the laser excitation set at 785 nm, strong green （centered at 543 nm） upconversion emissions, as well as weak red （651 nm）, violet （406 nm）, and blue （470 nm） upconversion emissions were obtained. With 514.5 nm laser excitation, violet （406 nm） and blue （470 nm） upconversion emissions were observed. Under 980 nm laser excitation, strong green （543 nm） and weak red （651） emissions were also obtained. The laser power dependence of the upconverted emissions was investigated to understand the upconversion mechanism. The excited state absorption （ESA） and the energy transfer （ET） processes were discussed as the possible mechanisms for all upconversion emissions.

关键词： upconversion LiKGdF5:Er^3+ excited state absorption energy transfer rare earths

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Green, orange, and red upconversion luminescence in Nd^(3+)/Yb^(3+): Cs_2NaGdCl_6 powders under 785 nm laser excitation

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Journal of Rare Earths 2008年第6期26卷 880-882页

作者：王殿元郭艳艳吴杏华张玉霞 College of Science Jiujiang University College of Mechanical and Materials Engineering Jiujiang University

Nd^3＋：Cs2NaGdCl6 and Nd^3＋, Yb^3＋：Cs2NaGdCl6 polycrystalline powder samples were prepared by Morss method E. Under 785 nm semiconductor laser pumping, the upconversion luminescence of Nd^3＋ ions in Cs2NaGdCl6 was investigated at room temperature, and three upconversion emissions near 538 nm （Green）, 603 nm （Orange）, and 675 nm （Red） were observed and assigned to ^4G7/2→^4I9/2, （^4G7/2→^4I11/2; ^4G5/2→^4I9/2）, and （^4G7/2→^4I13/2; ^4G5/2→^4I11/2 ）, respectively. The dependences of these upconverted emissions on laser power and Nd^3＋ ion concentration were investigated, to explore the upconversion mechanism. The effect of doping Yb^3＋ ions on the upconversion luminescence of Nd^3＋ in Cs2NaGdCl6 was also studied under 785 nm laser excitation. The energy transfer processes were discussed as the possible mechanism for the above upconversion emissions.

关键词： upconversion luminescence energy transfer excited state absorption rare earths

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