Energy Migration and Energy Transfer in GdB₃O₆:Bi,Tb

Abstract

In recent years Gd³⁺ compounds were studied not only because of the fundamental interest in these compounds, but also for their practical use as lamp phosphors. Measurements on GdB₃0₆:Bi, Tb were performed to elucidate the energy transfer and energy migration mechanisms that occur in this material. Spectral measurements and measurements on the temperature dependence of the Gd³⁺ emission show that at least two Gd³⁺ traps are present. A shallow one (~80 cm-l) and a deep one (~500 cm-l). Decay measurements of the Gd³⁺ emission and the Tb³⁺ emission show that the energy migration among the Gd³⁺ ions on the 3-dimensional Gd³⁺ sublattice is of the fast diffusion type, not only at 290K but also at 4.5K.