Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5431061 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2006 | 13 Pages |
We report on the energy transfer and frequency upconversion spectroscopic properties of Er3+-doped and Er3+/Yb3+-codoped TeO2-ZnO-Na2O-PbCl2 halide modified tellurite glasses upon excitation with 808 and 978Â nm laser diode. Three intense emissions centered at around 529, 546 and 657Â nm, alongwith a very weak blue emission at 410Â nm have clearly been observed for the Er3+/Yb3+-codoped halide modified tellurite glasses upon excitation at 978Â nm and the involved mechanisms are explained. The quadratic dependence of fluorescence on excitation laser power confirms the fact that the two-photon contribute to the infrared to green-red upconversion emissions. And the blue upconversion at 410Â nm involved a sequential three-photon absorption process.