| 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： | 10 June 2013 |
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