Compositional dependence of the luminescence properties of Mn2+-doped metaphosphate glasses

Effect of R type on absorption and luminescence properties in xMnO–(50 − x)RO–50P2O5 glasses where R = Zn, Mg, Ca, Sr, and Ba with x = 1, 5, and 10 is studied. The 6A1 (S) → 4T2, 4E (D) and 6A1 (S) → 4A1, 4E (G) transitions of Mn2+ are observed in absorption spectra. The broad emission bands assigned to the 4T1 (G) → 6A1 (S) transition of Mn2+ are obtained with a peak appeared in the wavelength region of 610–630 nm. The emission peak wavelength, intensity, and quantum yield vary systematically with radius of R ion and Mn concentration. The compositional dependence of the emission properties of Mn2+ in the metaphosphate glasses is interpreted from the point of the local environment around Mn2+ ions.