Optically transparent Er3+ and Eu3+ doped (less than 1.5 mol% Er2O3 and Eu2O3) glass ceramics based on the system K2O-MgO-Nb2O5-TeO2 have been successfully prepared for the first time. Addition of Er3+ and Eu3+ is effective for the formation of a crystalline phase showing second harmonic generation. Fluorescence spectra of Er3+ and Eu3+ in glass ceramics are almost similar to those in precursor glasses. The intensity of frequency upconversion fluorescence at around 550 nm due to the 4 S312→4I1512 transition of Er3+ in the glass ceramics is strong compared with that in their precursor glass. From the phonon sideband spectra associated with 5D2→7F0 transition of Eu3+ it is found that the phonon energy for transparent glass ceramics is smaller than that in the glasses, indicating that the multiphonon relaxation rate of Er3+ and Eu3+ present in TeO2 based glass ceramics is smaller than that in the corresponding TeO2 based glasses. Whether Er3+ and Eu3+ are incorporated into the crystalline phase or not is unclear the present study gives a new possibility for optical applications of transparent TeO2 based glass ceramics.
|Number of pages||7|
|Journal||Physics and Chemistry of Glasses|
|Publication status||Published - Dec 1 1999|
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry