Figure 3
From: Narrow Energy Gap between Triplet and Singlet Excited States of Sn2+ in Borate Glass
PL-PLE contour plots of xSnO-(25-x)SrO-75B2O3 glasses.
(a) x = 0.1, (b) x = 0.5 and (c) x = 1.0. Contour plot of (Sn0.02Sr0.98)B6O10 crystal (d) is also shown for comparison. Dashed circle in (d) shows weak excitation band owing to S0-T1 excitation21.
