Influence of additional Eu3+ coactivator on the luminescence properties of Tb3Al5O12:Ce3+, Eu3+

✍ Scribed by Mihail Nazarov; Do Young Noh; Jongrak Sohn; Chulsoo Yoon

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 289 KB
• Volume: 30
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2007.07.005

✦ Synopsis

The luminescence properties of doubly activated terbium aluminium garnet samples were investigated in the present study. Commercial Tb 3 Al 5 O 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.