Ytterbia and erbia dual-doped zirconia(ZrO_2:Yb^(3+),Er^(3+))nanophosphors were successfully synthesized by high-temperature fuel combustion at 1000°C for 2 h.The effects of dopant concentration on the structure and upconversion properties were investigated by X-ray diffraction,transmission electron microscopy and photoluminescence,respectively.XRD patterns indicate that the main phase of products belongs to cubic ZrO_2 fluorite-type structure.TEM results show that different fuels have great influence on the morphologies of dual-doped ZrO_2 samples.Under 980 nm excitation,the glycine-calcined nanophosphors show high stimulated luminescence and doped-ion concentration-depended intensities.The intensely red upconversion emissions are attributed to the fact that the dual-doped Yb^(3+)and Er^(3+)ions result in the non-radiative relaxation,energy migration,and cross relaxation.
LIU Xiao-linZHANG NingLI DanLI Zhi-chengYOU Wei-xiongZHANG QianXIA Li-binYANG Bin
