Abstract
Y2O3∶ Yb / Tm / Gd@ Y2O3 microcrystals with core-shell structure were prepared by homogeneous precipitation method and then annealed at high temperature. The microparticles were characterized by transmission electron microscopy( TEM),X-ray diffraction( XRD),and luminescent spectra. Upconversion spectra and excitation power dependence indicate that the energy transfer from Tm3 +to Gd3 +plays a crucial role in populating the excited states of Gd3 +. The shortest wavelength of upconversion emissions in Y2O3 matrix is converted from the infrared region. Meanwhile,the core-shell structure greatly improved the upconversion fluorescence intensity of Gd3 +in Yb3 +-Tm3 +-Gd3 +codoped system.
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