Figure 1
From: Narrow Energy Gap between Triplet and Singlet Excited States of Sn2+ in Borate Glass
Concentration dependence of PL, PLE and optical absorption spectra of xSnO-(25-x)SrO-75B2O3 glasses.
PL and PLE spectra (solid line) are normalized. Absorption spectra (dashed line) indicate that strong absorption band originating in Sn2+ correlates with emission.
