| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5402750 | Journal of Luminescence | 2010 | 4 Pages |
Abstract
Upconversion (UC) luminescence of Y2O3:Ho3+, Yb3+ nanocrystals codoped with different concentrations of Eu3+ ions were investigated to improve the monochromaticity of the UC emission. The results show that the monochromaticity, quantified by a parameter SR, increases as the concentration of Eu3+ ions becomes higher, which is due to the energy transfer between 5I7 (Ho3+) and 7F6 (Eu3+). The energy transfer accelerates the relaxation of Ho3+ ions from the 5I7 to 5I8 state and then quenches the red emission. The influence of the Eu3+ concentration on the pump power dependence of the red UC fluorescence in Y2O3:Ho3+, Yb3+, Eu3+ nanocrystals is verified using the steady-state rate equation theory.
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Authors
Y.Q. Sheng, L.L. Xu, J. Liu, D. Zhai, Z.G. Zhang,