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Investigation of 2.9 μm luminescence properties and energy transfer in Tm^(3+)/Dy^(3+) co-doped chalcohalide glasses

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Journal of Rare Earths 2011年第2期29卷 105-108页

作者：李忠秀徐铁峰沈祥戴世勋王训四聂秋华章向华 College of Information Science and Engineering Ningbo University College of Science Jiangxi Agricultural University Laboratoire de Verres et Ceramiques Universitè de Rennes I

A series of chalcohalide glasses based on the composition of 0.9（Ge30Ga5Se65）-0.1CsI with different Tm3＋/Dy3＋-codoped ions concentrations were synthesized by melt-quenching *** absorption spectra and 2.9 μm mid-infrared fluorescence spectra of glass samples under 800 nm laser excitation were *** results showed that Tm3＋ was an efficient sensitizer,which could enhance the Dy3＋： 2.9 μm fluorescence intensity *** effective energy transfer between the two rare-earth ions were mainly attributed to the resonance energy transfer from Tm3＋：3F4 to Dy3＋：6H11/2 *** cross section of 2.9 μm mid-infrared luminescence was also investigated according to Judd-Ofelt theory,σe=2.51×10–20 cm2.

关键词： chalcohalide glasses luminescence properties energy transfer Tm3+/Dy3+ rare earths

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CsCl Effected Ultrafast Third-order Optical Nonlinearities of GeS_2-Sb_2S_3 Chalcogenide glasses

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Journal of Materials Science & Technology 2009年第6期25卷 772-776页

作者： Hua Zhang Qiuhua Nie Shixun Dai Xiang Shen Xunsi Wang Xianghua Zhang Faculty of Information Science and Engineering The State Key Laboratory Base of Novel Functional Materialsand Preparation Science Ningbo University Ningbo 315211 China Universite de Rennes I Rennes 35042 France

A series of alkali halide doped chalcohalide glasses （100-x）（0.9GeS2-0.1Sb2S3）-xCsCl （x=5, 10, 15 and 20 mole fraction） were prepared. The absorption spectra and Raman scatting spectra of these glasses were measured. The optical band gaps Eopt were obtained from ultraviolet absorption edges. Z-scan technique was utilized to investigate the third-order nonlinear optical properties of GeS2-Sb2S3-CsCl glasses. The value of Eopt increases and the third-order optical nonlinearity decreases with increasing CsCl content. Decreasing lone-pair electron and broadening the band-gap will provide less transition paths for nonlinear process, which play a key role in ultrafast third-order nonlinear optical responses of these chalcohalide glasses.

关键词： Optical band gap Microstructural units Optical nonlinearity chalcohalide glasses

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Microstructure and Thermal Properties of the GeS_2-In_2S_3-CsI glasses

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Journal of Wuhan University of Technology(Materials Science) 2006年第1期21卷 106-109页

作者：毛舜赵修建 Key Laboratory of Silicate Materials Science and Engineering(Wuhan University of Technology) Ministry of Education Wuhan 430070 China

The-homogeneous GeS2-In2 S3-CsI glassy samples were prepared by conventional melt-quenching method. When the molar ratio of In2 S3 to Csl remains 1, the non-crystalline region can extend to the composition 0.4GeS2-0.3In2S3-0.3 CsI. And with the addition of CsI, the glass-forming ability of this serial glass reaches its maximum at the composition 0.8GeS2-0.1 In2 S3 -0.1CsI. According to the Raman spectra, the microstructure of these glasses is mainly constituted by [ GeS4 ] and [ InS4-xIx ] tetrahedra, which are interconnected by the bridging sulfur atoms ; meanwhile, the ethane-liked structural units [ S3 Ge-GeS3 ] can be formed because of the lacking of sulfur ; Cs ^＋ ion, which is added from CsI , exists as the nearest neighbor of I-ion in the glassy network.

关键词： chalcohalide glasses microstructure thermal properties

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