Abstract
Upconversion (UC) luminescence of Y 2O 3:Ho 3+, Yb 3+ nanocrystals codoped with different concentrations of Eu 3+ 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 Eu 3+ ions becomes higher, which is due to the energy transfer between 5I 7 (Ho 3+) and 7F 6 (Eu 3+). The energy transfer accelerates the relaxation of Ho 3+ ions from the 5I 7 to 5I 8 state and then quenches the red emission. The influence of the Eu 3+ concentration on the pump power dependence of the red UC fluorescence in Y 2O 3:Ho 3+, Yb 3+, Eu 3+ nanocrystals is verified using the steady-state rate equation theory.
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