Abstract
Y 2O 3:Tb 3+ nanoparticles were synthesized using Pechini-type sol–gel method, and characterized by TEM, XRD, and Raman spectra. Their spectroscopic properties are investigated using optical absorption, spectral- and time-resolved upconversion emission spectra. The dependence of Tb 3+ emission intensity on pump power density reveals that it is a three-photon excitation process. These results above indicate that upconversion excitation practically originates from the parity-allowed 4 f–5 d transition via a three-photon simultaneous absorption of Tb 3+ ions. The upconversion luminescence intensities of Y 2O 3:Tb 3+ nanoparticles decrease with Tb 3+ doping concentrations in the range of 1∼4 mol%. The measured average lifetimes of the 5D 4 level of Tb 3+ ions also decrease with increasing Tb 3+ concentrations at room temperature.
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