Abstract
Intense orange-yellow luminescence was achieved in trivalent dysprosium ion (Dy3+) doped waveguide-adaptive sodium magnesium aluminium germanate (NMAG) glasses under ultraviolet (UV) radiation. The dominant 482.5 nm (blue) and 574.5 nm (yellow) peaks correspond to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions, respectively. The internal quantum efficiency for the 4F9/2 level of Dy3+ and the total external quantum yield for the four visible emissions were calculated to be 70.88% and 8.90%, respectively. Slab and channel waveguides were attempted by K+-Na+ ion-exchange processes and the effective diffusion coefficient De was derived to be 0.085 μm2/min, indicating that thermal ion exchange was feasible to fabricate Dy3+-doped NMAG glasses waveguide. The efficient visible emissions in Dy3+-doped NMAG glasses demonstrate the potential in developing waveguide-typed irradiation light sources for minimally invasive photodynamic therapy.
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