| Abstract: | Optically transparent Er3+-doped tellurite-based nanocrystallized glasses with the composition of 70TeO2·15Lie2O·0·15Nb2O5·0.5Er2O3(mol)have been perpared by a conventional melting quenching and the subsequent heat treatment porcesses.The sizes of grown nanocrystals in glass matrix appear to be35-50 nm from the X-ray diffraction (XRD) measurement. The microhardness measurement shows that the Vickers hardness values of the nanocrystallized tellurite glasses are larger (33%-62%) than those inthe base glass. The Raman spectra imply that the maximum phonon energy of the based glass decreases and shifts from 668 to 638 cm-1 after heat-treatment. Visible upconversion luminescence and infrared luminescence of the base glass and heat-treated glasses under 980-nm laser diode (LD) excitation are investigated. The 524-, 546- and 656-nm upconversion intensities by 980-nm pumping increase significantly. |
