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Nano-effect enhanced cooperative luminescence of Yb^(3+) clusters in bulk materials

Journal of Rare Earths 2024年第3期42卷 473-478,I0002页

作者： Daguang Li Jiahao Cui Yanhui Dong Hao Cui Dan Zhao Weiping Qin State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China

In order to improve the multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely the nanoshell effect in bulk materials. Based on the effect, an optimal material structure was designed by coating the surfaces of Ca F_(2):Yb^(3+)micron size particles with ZrO_(2). An about 2 times higher intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exhibits that the novel effect plays a key role in improving the performance of cooperative transitions. Our results also suggest that the nanoshell effect in bulk materials is likely to be significant in some special cases, which have not been reported yet in the literature.

关键词： Yb^(3+)cluster ZrO_(2) nanoshell Enhancement Cooperative luminescence Rare earths

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A nonlocal strain gradient shell model incorporating surface effects for vibration analysis of functionally graded cylindrical nanoshells

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Applied Mathematics and Mechanics(English Edition) 2019年第12期40卷 1695-1722页

作者： Lu LU Li ZHU Xingming GUO Jianzhong ZHAO Guanzhong LIU Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072 China Department of Mechanical Engineering University of Alberta School of Mathematics and Computational Sciences Xiangtan UniversityXiangtan 411105 Hunan Province China

In this pap er, a novel size-dep endent functionally graded (FG) cylindrical shell model is develop ed based on the nonlocal strain gradient theory in conjunction with the Gurtin-Murdoch surface elasticity theory . The new model containing a nonlocal parameter, a material length scale parameter, and several surface elastic constants can capture three typical typ es of size e ects simultaneously , which are the nonlocal stress ef- fect, the strain gradient e ect, and the surface energy e ects. With the help of Hamilton’s principle and rst-order shear deformation theory , the non-classical governing equations and related b oundary conditions are derived. By using the prop osed model, the free vibra- tion problem of FG cylindrical nanoshells with material prop erties varying continuously through the thickness according to a p ower-law distribution is analytically solved, and the closed-form solutions for natural frequencies under various b oundary conditions are obtained. After verifying the reliability of the prop osed model and analytical method by comparing the degenerated results with those available in the literature, the in uences of nonlocal parameter, material length scale parameter, p ower-law index, radius-to-thickness ratio, length-to-radius ratio, and surface e ects on the vibration characteristic of func- tionally graded cylindrical nanoshells are examined in detail.

关键词： nonlocal strain gradient theory surface elasticity theory rst-order shear deformation theory vibration functionally graded (FG) cylindrical nanoshell

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Quantifying the effectiveness of SiO_2/Au light trapping nanoshells for thin film poly-Si solar cells

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Science China(Technological Sciences) 2010年第8期53卷 2228-2231页

作者： BAI YiMing 1 ,WANG Jun 2 ,CHEN NuoFu 1,3 ,YAO JianXi 1 ,YIN ZhiGang 3 ,ZHANG Han 3 , ZHANG XingWang 3 ,HUANG TianMao 3 ,WANG YanShuo 3 &YANG XiaoLi 3 1School of Renewable Energy Engineering,North China Electric Power University,Beijing 102206,China 2 National Engineering Research Center for Optoelectronic Devices,Institute of Semiconductors, Chinese Academy of Sciences,PO Box 912,Beijing 100083,China 3 Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors, Chinese Academy of Sciences,PO Box 912,Beijing 100083,China School of Renewable Energy Engineering North China Electric Power University Beijing China National Engineering Research Center for Optoelectronic Devices Institute of Semiconductors Chinese Academy of Sciences Beijing China Key Laboratory of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences Beijing China

In order to enhance light absorption of thin film poly-crystalline silicon(TF poly-Si)solar cells over a broad spectral range, and quantify the effectiveness of nanoshell light trapping structure over the full solar spectrum in theory,the effective photon trapping flux(EPTF)and effective photon trapping efficiency(EPTE)were firstly proposed by considering both the external quantum efficiency of TF poly-Si solar cell and scattering properties of light trapping *** EPTF,EPTE and scattering spectrum exhibit different behaviors depending on the geometric size and density of nanoshells that form the light trapping *** an optimum size and density of SiO2/Au nanoshell light trapping layer,the EPTE could reach up to 40%due to the enhancement of light trapping over a broad spectral range,especially from 500 to 800 nm.

关键词： thin film poly-crystalline silicon surface plasmons SiO2/Au nanoshell

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聚合物/普鲁士蓝纳米复合空心球的可控制备与表征

聚合物/普鲁士蓝纳米复合空心球的可控制备与表征

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2010年全国高分子材料科学与工程研讨会

作者：梁国栋伍青王晓松中山大学化学与化学工程学院高分子研究所 Department of Colour Science School of ChemistryUniversity of Leeds

＜正＞金属聚合物纳米复合结构近年来受到广泛关注,可应用于光学、电磁、清洁能源、力学等领域。自从Stephen Mann于2000年首次采用反向乳液技术制备了普鲁士蓝纳米颗粒科研工作者已合成各种形状的普鲁士蓝纳米颗粒,如具有二维结构的普... 详细信息

＜正＞金属聚合物纳米复合结构近年来受到广泛关注,可应用于光学、电磁、清洁能源、力学等领域。自从Stephen Mann于2000年首次采用反向乳液技术制备了普鲁士蓝纳米颗粒科研工作者已合成各种形状的普鲁士蓝纳米颗粒,如具有二维结构的普鲁士蓝片层、普鲁士蓝棒、普鲁士蓝盘等,然而,普鲁士蓝纳米空心球的合成尚未见报道。我们首次采用细乳液辅助壳聚合技术制备了结构可控的普鲁士蓝纳米空心球。

关键词： Prussian blue nanoshell Controlled synthesis

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