Spectral studies on Mn2+ ions doped in sodium–lead borophosphate glasses

Electron paramagnetic resonance (EPR), optical absorption, and luminescence spectral studies of Mn2+ ions doped in (30−x) (NaPO3)6+30PbO+40B2O3+xMnO2 (x=1.0, 2.0, 3.0, 4.0, and 5.0 mol%) glasses have been studied. The EPR spectra exhibit resonance signals with effective g value at geff≈2.02 with six line hyperfine structure. A weak resonance signal with effective g value at geff≈4.3 is also observed for higher concentrations of Mn2+ ions. The EPR spectra of x =3.0 mol% of Mn2+ in sodium–lead borophosphate glass sample have been studied at various temperatures. It is observed that the resonance signal intensity decreases with increase in temperature. The optical absorption spectrum exhibits bands characteristic of Mn2+ ions in octahedral symmetry. From the analysis of the bands, the crystal-field parameter Dq and the Racah interelectronic repulsion parameters B and C have been evaluated. The emission spectrum exhibits single broad band in the green region.