“…A large spectral bandwidth of nearly 2500 cm À1 is noted. Moreover, a larger red shift of the emission peak is seen (D(1/k) = 1125 cm À1 ) when compared to the 343 cm À1 energy shift observed for MgAl 2 O 4 :Mn 2+ crystals [6]. The corresponding excitation spectra were similar, therefore only one experimental curve is shown in Fig.…”