Excited-state relaxation dynamics of Cr3+ in YAl3(BO3)4

G. Dominiak-Dzik, W. Ryba-Romanowski, M. Grinberg, E. Beregi, L. Kovacs

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Abstract

The room temperature excitation spectrum of luminescence of Cr3+ in the YAl3(BO3)4 single crystal have been used to estimate the crystal-field strength Dq and the Racah parameters B and C. The Dq/B = 2.4 value indicates that dopant ions occupy strong-crystal-field sites. Emission spectra of Cr3+ are consistent with a strong-crystal-field case in which the 2E excited state is the lowest. The influence of temperature on the R1 line position has been examined and it has been found that the thermal line shift is consistent with predictions derived from consideration of ion-phonon interaction. The influence of temperature on emission lifetime in the 5-300 K temperature range has been analysed. In doing this, the energetic structure of Cr3+, consisting of the ground-state and excited electronic manifolds mixed by the spin-orbit interaction, has been constructed using the diabatic representation. An expression for the total probability of the depopulation of luminescent states was next derived and fitted to experimental data yielding the 2E-4T2 separation energy Δ = 730 cm-1 and the 4T2 radiative lifetime τ0 = 18.9 μs.

Original languageEnglish
Pages (from-to)5229-5237
Number of pages9
JournalJournal of Physics Condensed Matter
Volume14
Issue number20
DOIs
Publication statusPublished - May 27 2002

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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