EXAFS study of cation reordering in NaYF4:Yb3+,Tb3+ up-conversion luminescence materials |
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作者姓名: | H.F. Brito J. Holsa T. Laamanen T. Laihinen M. Lastusaari L. Pihlgren L.C.V. Rodrigues T. Soukka |
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作者单位: | [1]lnstituto de Quimica, Universidade de Sao Paulo, Sao Paulo-SP, Brazil [2]Department of Chemistry, University of Turku, FI-20014 Turku, Finland [3]Turku University Centre .for Materials and Surfaces (MatSurf), Turku, Finland [4]University of Turku Graduate School (UTUGS), Doctoral Programme in Physical and Chemical Sciences, Turku, Finland [5]Graduate School of Materials Research (GSMR), Turku, Finland [6]Department of Biochemistry, University of Turku, FI-20014 Turku, Finland |
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基金项目: | Project supported by Palomaa-Erikoski foundation, Academy of Finland, Conselho Nacional de Desenvolvimento Cientifico e Tec- nologico (Brazil), Finnish Funding Agency for Technology and Innovation (TEKES), Nordic Energy Research (Oslo, Norway) and the European Community's Seventh Framework Programme (FP7/2007-2013) (312284) |
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摘 要: | The NaYF4:yb3+,Tb3+ (Xyb: 0.20, XTb: 0.04) materials were prepared using the co-precipitation method, lne as-preparea material was washed either with or without water in addition to ethanol and thereafter annealed for 5 h at 500℃. This resulted in materials with moderate or very high up-conversion luminescence intensity, respectively. The structural study carried out with X-ray powder diffraction revealed microstrains in the rare earth (R) sublattice that were relaxed for the material with very high up-conversion intensity thus decreasing energy losses. The local structural details were investigated with R LⅢ and Y K edge ex- tended X-ray absorption fine structure (EXAFS) using synchrotron radiation. Around 10 tool.% of the Yb3+ ions were found to occupy the Na site in the material with very high up-conversion intensity. These Yb species formed clusters with the Tb3+ ions occupying the regular Na/R sites. Such clustering enhanced the energy transfer between Yb3+ and Tb3+ thus intensifying the up-conversion emission.
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关 键 词: | 上转换发光材料 EXAFS 镱离子 铽离子 阳离子 X射线吸收精细结构 排序 发光强度 |
收稿时间: | 2013-06-10 |
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