Abstract
Trivalent dysprosium (Dy3+)-doped K–Sr–Al phosphate glasses have been prepared and investigated for their optical and luminescence properties. Judd–Ofelt theory has been used to derive radiative properties for the 4F9/2 level of Dy3+ ions. The luminescence spectrum of 1.0 mol% Dy2O3-doped glass shows intense yellow emission around 572 nm ascribed to 4F9/2 → 6H13/2 transition with 78 % branching ratio and emission cross section of the order of 2.48 × 10−21 cm2. Moreover, the quantum efficiency of the 4F9/2 level has been found to be 76 %. The luminescence decay curves for the yellow emission (4F9/2 → 6H13/2) have been measured and analyzed as a function of Dy3+ ion concentration. The results revealed that Dy3+-doped phosphate glasses could be useful for yellow laser applications.
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