Improvement of 1.53 μm band fluorescence and energy transfer in Er~(3+)/Ce~(3+) codoped tellurite glasses

摘要

The high phonon-energy oxide of B_2O_3 was introduced into the Er~(3+)/Ce~(3+) codoped tellurite glasses with composition of TeO_2-ZnO~Na_2O to improve the 1.53 urn band fluorescence intensity of Er~(3+) and thermal stability of glass hosts. To evaluate the effect of B_2O_3 component on the fluorescence properties of Er~(3+) and thermal stability of glass hosts, the absorption spectra, upconversion emission spectra, fluorescence emission spectra, fluorescence lifetimes, Raman spectra and differential scanning calorimeter (DSC) curves of glass samples were measured and investigated, respectively. It is shown that the introduction of an appropriate amount of B_2O_3 component can further improve the 1.53 urn band fluorescence intensity through an enhanced phonon-assisted energy transfer between Er~(3+) and Ce~(3+) ions, and the energy transfer mechanism is investigated quantitatively in detail by calculating energy transfer micro-coefficients and phonon contributions. Furthermore, the thermal stability of glass hosts increases with the B_2O_3 component amount, and meanwhile relevant spectroscopic parameters and quantum transition efficiencies of Er~(3+) are calculated and analyzed using Judd-Ofelt theory. The present results indicate that the prepared Er~(3+)/Ce~(3+) codoped tellurite glass with an appropriate amount of B_2O_3 component has good prospect as a gain medium applied for 1.53 urn band broad and high-gain EDFA.