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Journal of Nanomaterials
Volume 2007 (2007), Article ID 48247, 10 pages
Research Article

Luminescence, Energy Transfer, and Upconversion Mechanisms of Y2O3 Nanomaterials Doped with Eu3+, Tb3+, Tm3+, Er3+, and Yb3+ Ions

1Institute of Materials Science, Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam
2Institute des Nanosciences de Paris (INSP), UMR-CNRS 7588, Universites Pierre et Marie Curie et Denis Diderot, 140 Rue de Lourmel, Paris 75015, France
3College of Technology, Vietnam National University, 144 Xuan Thuy Street, Cau Giay District, Hanoi, Vietnam

Received 21 May 2007; Revised 16 December 2007; Accepted 31 December 2007

Academic Editor: Wieslaw Strek

Copyright © 2007 TranKim Anh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Luminescence, energy transfer, and upconversion mechanisms of nanophosphors (Y2O3:Eu3+, Tb3+, Y2O3:Tm3+, Y2O3:Er3+, Yb3+) both in particle and colloidal forms were studied. The structure, phase, and morphology of the nanopowders and nanocolloidal media were determined by high-resolution TEM and X-ray diffraction. It was shown that the obtained nanoparticles have a round-spherical shape with average size in the range of 4 to 20 nm. Energy transfer was observed for Y2O3:Eu3+, Tb3+ colloidal and powders, upconversion transitions were observed for both Y2O3:Er3+ and Y2O3:Er3+, Yb3+ nanophosphors. The dependence of photoluminescence (PL) spectra and decay times on doping concentration has been investigated. The infrared to visible conversion of emission in Y2O3:Er3+, Yb3+ system was analyzed and discussed aiming to be applied in the photonic technology.