Time-resolved spectroscopy of Bi3+ Centers in Y4Al2O9 ceramics

Abstract

Time-resolved emission and excitation spectra as well as luminescence decay kinetics are studied at 4.2-400 K under excitation in the 3-6 eV energy range for Bi³⁺ ions substituting for Y³⁺ ions in four nonequivalent crystal lattice sites of Y₄Al₂O₉:Bi ceramics. The dependences of the luminescence characteristics and the relaxed excited state structure of Bi³⁺centers on their nearest surroundings are discussed.