Energy Transfer in Dy(3+) and Tb(3+) Double-Doped Barium Borate Glass

In this work, single- and double-doped Dy [Formula: see text] and Tb [Formula: see text] barium borate glasses are investigated for their potential as light converters. The density and the absorption coefficient show linearly increasing trends with an increasing lanthanide content. The external quantum efficiency of the double-doped samples is a combination of the respective single-doped samples. The strong energy transfer from Dy [Formula: see text] to Tb [Formula: see text] results in an intense Tb [Formula: see text]-related emission, i.e., an intense green luminescence. Thus, excitation at a Dy [Formula: see text]-related wavelength of 452 nm enables a Tb [Formula: see text]-related emission, at which a single-doped Tb [Formula: see text] sample barely shows any luminescence. Lifetime measurements show that there is not only an energy transfer from Dy [Formula: see text] to Tb [Formula: see text] , but also vice versa.