| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9578229 | Chemical Physics Letters | 2005 | 5 Pages |
Abstract
The effect of Yb3+ ions on the blue upconversion (UPC) emission of Yb3+-Tm3+ co-doped ZrO2 nanocrystals is reported. The blue (490Â nm) UPC emission is due to 1G4-3H6 transition of Tm3+ and the pump power dependence of this UPC emission band are cubic indicating that three excitation photons are involved in the UPC process. An additional UPC emission band at 505Â nm is observed when the Yb3+ concentration is above 1.25Â mol%. The pump power dependence of the emission at 505Â nm is quadratic, indicating that this emission may have its origin from excited Yb3+ pairs producing cooperative UPC.
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Authors
Amitava Patra, Sujata Saha, Márcio A.R.C. Alencar, Nikifor Rakov, Glauco S. Maciel,