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Upconversion emission enhancement in Yb3+/Er3+-codoped Y2O3 nanocrystals by tridoping with Li+ ions

Chen, Guanying and Liu, Haichun and Liang, Huijuan and Somesfalean, Gabriel and Zhang, Zhiguo (2008) Upconversion emission enhancement in Yb3+/Er3+-codoped Y2O3 nanocrystals by tridoping with Li+ ions. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (31). pp. 12030-12036.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp804064g

Abstract

We demonstrate that tridoping with Li+ ions enhances the visible green and red upconversion (UC) emissions in Er3+/Yb3+-codoped Y2O3 nanocrystals by up to half of the bulk counterpart, i.e., about 2 orders of magnitude higher than previous results. X-ray diffraction and decay time investigations give evidence that tridoping with Li+ ions can tailor the local crystal field of the Y2O3 host lattice. Theoretical calculations illustrate well that a significant UC intensity enhancement arises from the synthesized tailoring effect induced by the Li+ ions, which increase lifetimes in the intermediate I-4(11/2) (Er) and F-2(5/2) (Yb) states, increase optically active sites in the Y2O3 host lattice, and dissociate the Yb3+ and Er3+ ion clusters in the nanocrytals. The general theoretical description of the visible UC radiations shows that the Yb3+ ion sensitization and the tailoring effect induced by the Li+ ions are two independent enhancement mechanisms, which is expected to lead to an increasing number of photonic and biomedical applications in the future.

Item Type:Article
Subjects:Biomedical Science > Nanobiotechnology
Material Science > Nanostructured materials
Physical Science > Photonics
ID Code:1872
Deposited By:Farnush Anwar
Deposited On:16 Dec 2008 14:21
Last Modified:16 Dec 2008 14:21

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