| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7908982 | Optical Materials | 2015 | 5 Pages |
Abstract
Steady-state and time-resolved emission and excitation spectra as well as luminescence decay kinetics are studied at 4.2-400Â K under excitation in the 3-6Â eV energy range for Bi3+ ions substituting for Y3+ ions in four inequivalent crystal lattice sites of Y4Al2O9:Bi ceramics. Luminescence characteristics of Bi3+ centers of all the four types are identified and are shown to arise from the radiative decay of the triplet relaxed excited state (RES) of Bi3+ ions. The parameters of the triplet RES, namely, probabilities of the radiative and nonradiative transitions from the metastable and emitting levels as well as the energy distance between these levels, are determined. The influence of the nearest surroundings of Bi3+ ions on the luminescence characteristics and the parameters of the triplet RES of Bi3+ centers is discussed.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
V. Babin, L. LipiÅska, E. Mihokova, M. Nikl, T. Shalapska, A. Suchocki, S. Zazubovich, Ya Zhydachevskii,