Preparation and luminescent properties of cubic Eu3+ :Y2O3 nanocrystals and comparison to bulk Eu3+ :Y2O3

被引：71

作者：

Fu, Zuoling ^{[1
]}

Zhou, Shihong ^{[1
]}

Pan, Tianqi ^{[1
]}

Zhang, Siyuan ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Grad Sch, Lab Rare Earth Chem & Phys, Changchun 130022, Peoples R China

来源：

JOURNAL OF LUMINESCENCE | 2007年 / 124卷 / 02期

关键词：

combustion synthesis; nanocrystal; Y2O3 : Eu3+; charge-transfer band;

D O I：

10.1016/j.jlumin.2006.02.020

中图分类号：

O43 [光学];

学科分类号：

070207 [光学]; 0803 [光学工程];

摘要：

Y2O3:Eu3+ nanocrystals were prepared by combustion synthesis. The particle size estimated by X-ray powder diffraction (XRD) was about 10 nm. A blue-shift of the charge-transfer (CT) band in excitation spectra was observed in Y2O3:Eu3+ nanocrystals compared with bulk Y2O3:Eu3+. The electronic structure Of Y2O3 is calculated by density functional method and exchange and correlation have been treated by the generalized gradient approximation (GGA) within the scheme due to Perdew-Burke-Ernzerhof (PBE). The calculated results show that the energy centroid of 5d orbital in nanocrystal has increasing trend compared with that in the bulk material. The bond length and bond covalency are calculated by chemical bond theory. The bond lengths of Y2O3:Eu3+ nanocrystal are shorter than those of the bulk counterpart and the bond covalency of Y2O3:Eu3+ nanocrystal also has an increasing trend. By combining centroid shift and crystal-field splitting, the blue-shift of the CT band is interpreted. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：213 / 216

页数：4

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