Spectroscopic investigations of Mn2+ in sodium borosilicate glasses

Irradiation effects in oxide glasses doped with transition and rare-earth elements

“…These bands are attributed to Mn 2+ ions situated at different sites in the glass [40,50]. It is known that in silicate and germanate glasses, manganese ions exists in the Mn 2+ state with both octahedral and tetrahedral coordination [50], as was also shown by Menassa and Simkin [51] In addition, the luminescence analysis of sodium borosilicate glasses presented in [51] revealed that in these glasses, Mn 2+ ion occupies two sites: one octahedral and the other tetrahedral. Along with these conclusions, the authors showed that tetrahedral Mn 2+ ions are dissolved mainly in the Si-rich phase, while octahedrally-coordinated manganese is located primarily in the B-rich phase [51].…”

Spectroscopic and dielectric studies on MnO doped PbO–Nb2O5–P2O5 glass system

“…This band is attributed to 4 T 1g (G) → 6 A 1g (S) spin forbidden transition of octahedrally positioned Mn 2+ ions. As the concentration of MnO is increased gradually up to 1.0 mol%: (i) this band is observed to shift towards lower wavelength with decreasing intensity; (ii) a new band is observed at about 540 nm assigned to 4 T 1 (G) → 6 A 1 (S) (green emission) spin allowed transition of tetrahedrally positioned Mn 2+ ions [54][55][56]. When the concentration is increased further, the intensity of these bands is decreased and further observed to show red shift.…”

Optical properties of 3d transition metal ion-doped sodium borosilicate glass

“…The emission band is assigned to Mn 2+ [44,81] and the two features in the excitation spectrum correspond to the absorption transitions from 6 A 1g ( 6 S) to 4 E g ( 4 D) and 4 A 1g ( 4 G), 4 E g ( 4 G) [82]. The observation of orange emission around 580 nm from 4 T 1g ( 4 G) → 6 A 1g ( 6 S) in the sodium borosilicate glass indicates that the Mn 2+ ions are mostly in an octahedral environment [83].…”