The three-dimensional ordered macroporous CeO2:Yb,Er materials were prepared, and the influence of doping concentra-tion of Yb3+or Er3+ ions on upconversion property was investigated. Green and red upconversion emissions were observed under the excitation of 980 nm at room temperature. It was found that the ratio of red to green upconversion emission intensity increased with increasing of concentration of the Yb3+or Er3+ ions in the three-dimensional ordered macroporous CeO2:Yb,Er materials. When the concentration of Yb3+ was 10 mol.%, pure red upconversion emission was obtained. The varied mechanism of ratio of red to green upconversion emission intensity was discussed with the concentration of Yb3+or Er3+ ions.
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