Abstract
The luminescence properties of doubly activated terbium aluminium garnet samples were investigated in the present study. Commercial Tb 3Al 5O 12:Ce 3+ (TAG:Ce) shows the typical Ce 3+ ion luminescence of the allowed Ce 3+ d–f transition. Eu 3+ co-doping, however, reveals interesting results. In TAG:Ce, Eu, both Ce 3+ and Eu 3+ luminescence was measured at different Ce and Eu activator concentrations. The Ce 3+ ion can be used as a sensitizer in the TAG lattice that transfers its energy directly or via the Tb sublattice to the activator Eu 3+. The energy-level diagram was proposed to explain the luminescence mechanism. Application of TAG:Ce, Eu with improved chromaticity coordinates CIE (Commission Internationale de l’Eclairage) and color rendering index (CRI) in light emitting diodes (LEDs) is demonstrated.
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