Red phosphorescence properties of Mn ions in MgO–GeO2 compounds

Red phosphorescence properties on Mn ions doped MgO–GeO2 compounds, Mg4GeO6,Mg2GeO4, and MgGeO3, were investigated. The red phosphorescence was observed in MgGeO3:Mn2+. The red phosphorescence intensity of MgGeO3:Mn2+ increased withadding the MgF2 and Yb2O3. The red phosphorescence duration time of sample with a batch composition of 44 mol%-MgO, 6 mol%-MgF2, 50 mol%-GeO2, 0.1 mol%-MnO, and 0.05 mol%-Yb2O3 is approximately 30 min. The mechanism of red phosphorescence in MgGeO3:Mn2+ is discussed in terms of the relationship between valency state of manganese ions and point defects in matrix compound.© 2003 Elsevier Science Ltd. All rights reserved.