Abstract
In this work, cubic-phased CeO2:18 mol%Yb3+/2 mol%Er3+ nanospheres were prepared by coprecipitation method, in which the size of nanosphere was precisely controlled by regulating the amount of co-precipitator urea. The morphology evolution of CeO2:18%Yb3+/2%Er3+ samples that vary from nano-sphere to nano-flower with extending the reaction time was elaborately investigated via increasing the amount of urea and increasing the reaction temperature. The influence of non-radiative relaxation (NR) processes and surface quenching on up-conversion emission output of CeO2:18%Yb3+/2%Er3+ was investigated through varying the sizes and environmental temperatures. Tissue imaging experiment demonstrates that CeO2:18%Yb3+/2%Er3+ nanospheres have the potential to act as luminescent imaging reagents in tissue imaging.
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