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.
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