Correlation between emission property and concentration of Sn2+ center in the SnO-ZnO-P2O5 glass

The authors report on the correlation between the photoluminescence (PL) property and the SnO amount in SnO-ZnO-P2O5 (SZP) glass. In the PL excitation (PLE) spectra of the SZP glass containing Sn2+ emission center, two S-1 states, one of which is strongly affected by SnO amount, are assumed to exist. The PLE band closely correlates with the optical band edge originating from Sn2+ species, and they both largely red-shifts with increasing amount of SnO. The emission decay time of the SZP glass decreased with increasing amount of SnO and the internal quantum efficiencies of the SZP glasses containing 1 similar to 5 mol% of SnO are comparable to that of MgWO4. It is expected that the composition-dependent S-1 state (the lower energy excitation band) governs the quantum efficiency of the SZP glasses. (c) 2012 Optical Society of America