Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403353 | Journal of Luminescence | 2007 | 5 Pages |
Abstract
Nanocrystalline powders with various Eu3+ concentration (from 1 to 10Â mol %) doped La2O3 were prepared via a combustion route. Their structure and morphology were characterized using X-ray diffraction (XRD) and High-resolution transmission electron microscopy. The emission spectra of the as-synthesized samples show that the strongest emission position is centered at 626Â nm corresponding to 5D0â7F2 transition of Eu3+ ions and the intensity change of 626Â nm emission is considered as a function of ultraviolet (240Â nm) irradiation time. The excitation spectra at 626Â nm monitoring indicate that the charge transfer state band is varies with different Eu3+ ion concentration. These results are attributed to the surface defects of the nanocrystals.
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Authors
HuangQing Liu, LingLing Wang, ShuQuang Chen, Bingsuo Zou,