| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1619133 | Journal of Alloys and Compounds | 2010 | 6 Pages |
Y2O3:Tb3+ 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 Tb3+ 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 4f–5d transition via a three-photon simultaneous absorption of Tb3+ ions. The upconversion luminescence intensities of Y2O3:Tb3+ nanoparticles decrease with Tb3+ doping concentrations in the range of 1∼4 mol%. The measured average lifetimes of the 5D4 level of Tb3+ ions also decrease with increasing Tb3+ concentrations at room temperature.
