Abstract
The luminescence properties of Dy<sup>3+</sup> and Tb3+ single- as well as Dy<sup>3+</sup> / Tb<sup>3+</sup> double-doped barium borate glasses are investigated for their potential as light-converter. In double-doped barium borate glass an energy transfer from Dy<sup>3+</sup> to Tb<sub>3+</sub> is observed, i.e., an intense green luminescence from the doped Tb<sup>3+</sup> ions results upon excitation at Dy<sup>3+</sup>-related absorption bands. Ray-tracing simulations allow for an evaluation of singleand double-doped light guides in different length. Here, the luminous flux and luminance values at the rough output face of a luminescent light guide are determined.
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