Concentration dependence of Dy3+:1.3 μm luminescence in Ge–Ga–Sb–Se glasses

The Ge25Ga5Sb5Se65 glasses, doped with 0.01, 0.05, 0.1, 0.2, and 0.5 mol% of Dy3+ ions are prepared and the concentration dependence of Dy3+:1.3 μm luminescence is investigated. Remarkable energy migration between Dy3+ ions occurs as its concentration is more than 0.05 mol%. With further increasing amount of Dy3+ ions, the decay time of the 1.3 μm fluorescence decreases rapidly. All the decays are simple exponential and possible regimes of the donor decay are discussed.