Time-resolved spectroscopy of Bi.sup.3+./sup. centers in Y.sub.4./sub.Al.sub.2./sub.O.sub.9./sub..

0451425 - FZÚ 2016 RIV NL eng J - Journal Article
Babin, Vladimir - Lipinska, L. - Mihóková, Eva - Nikl, Martin - Shalapska, T. - Suchocki, A. - Zazubovich, S. - Zhydachevskii, Ya.
Time-resolved spectroscopy of Bi³⁺ centers in Y₄Al₂O₉.
Optical Materials. Roč. 46, Aug (2015), s. 104-108. ISSN 0925-3467. E-ISSN 1873-1252
R&D Projects: GA ČR GAP204/12/0805
Institutional support: RVO:68378271
Keywords : time-resolved luminescence * excited state dynamics * Bi³⁺ -doped Y₄Al₂O₉
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.183, year: 2015

Steady-state and 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 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.
Permanent Link: http://hdl.handle.net/11104/0252588