Photoluminescence of Bi2O3-SiO2 glasses and glass ceramics

Bi2O3-SiO2 glasses and glass ceramics were prepared by melting method and annealing treatment. NIR emission spectra, excitation spectra and fluorescence decay curves were measured. The main NIR luminescent peak and the FWHM of the NIR luminescent between Bi2O3-SiO2 glasses and glass ceramics are different. NIR luminescence peak at 1336 (1300) nm with FWHM about 200 nm is observed in Bi2O3-SiO2 glasses samples, while the main luminescent peak in Bi2O3-SiO2 glass ceramics locates at about 1069 nm with narrow FWHM. These two emission peaks have different excitation bands and lifetimes. We propose that NIR emissions located at 1069 nm and 1336 (1300) nm derive from Bi2+ and low valence Bi ions, respectively.