Abstract
Yb3+ and Er3+ were doped into Y2O3 to form Y2O3: Yb3+, Er3+ microcrystals. The effect of doping concentration of Yb3+ was studied. The near-ultraviolet (UV) upconversion (UC) emission spectra of Y2O3: Yb3+, Er3+ were studied under 1.55-μm excitation. The near-UV UC emissions centered at 391 and 418 nm were enhanced by Yb3+ under 1.55-μm laser excitation. Er3+ generally acts as activator and is not used as sensitizer in the reference Er3+-doped oxides. In the present upconversion process under the 1.55-μm laser excitation, the energy transfer from Er3+ to Yb3+ and then Yb3+ to Er3+ was observed. Dopant Er3+ acted as not only activator but also sensitizer. The energy transfer between Er3+ and Yb3+ enhanced the near-UV UC emission of our materials. The near-ultraviolet (UV) upconversion (UC) emission spectra of Y2O3:Yb3+, Er3+ microcrystalswere studied under 1.55-μm excitation. Enhancements of near-UV UC emission of Er3+ were observed. The energy transfer from Er3+ to Yb3+ and then Yb3+ to Er3+ was thought to be the possible mechanisms for these enhancements. The doping concentration of the Yb3+ ion was studied also. In the upconversion process, Er3+ ion is not only as activator but also as sensitizer.
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