Tb3+ Ion Optical and Magneto-Optical Properties in the Cubic Crystals KTb3F10 - PubMed (original) (raw)

Tb3+ Ion Optical and Magneto-Optical Properties in the Cubic Crystals KTb3F10

Uygun V Valiev et al. Materials (Basel). 2022.

Abstract

The optical and magneto-optical characteristics of KTb3F10 crystals in the transition region of 5D4 → 7F6 4f8 configurations of the Tb3+ ion at temperatures of 90 and 300 K were studied. The schemes of the optical transitions in the KTb3F10 crystals were constructed, and the energies of most of the Stark sublevels of the ground 7F6 and excited 5D4 multiplets of the Tb3+ ion split by the C4v symmetry crystal environment were determined. The presence of three- and two-doublet states in the energy spectra of the Tb3+ion multiplets 7F6 and 5D4, respectively, was established, which is in good agreement with theoretical predictions. The use of the wavefunctions of the Stark sublevels of multiplets split by a tetragonal crystal field and combining in the studied optical transition made it possible to explain some of the magnetic and magneto-optical features observed in the KTb3F10 single crystals.

Keywords: KTb3F10 crystal; Stark sublevels; Tb3+ ion; absorption spectra; crystal field; magnetic circular dichroism; magnetic circularly polarized luminescence; optical transitions.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1

Figure 1

XRD pattern of the KTF crystal. The positions of the Bragg reflections peak within sp. gr. Fm_–3_m (the lattice parameter a = 11.6732(2) Å) are indicated. Optical elements fabricated from the grown crystals are demonstrated in the insert.

Figure 2

Figure 2

RT transmission spectrum of the KTF crystal.

Figure 3

Figure 3

The normalized PL spectra of a KTF crystal at RT. Insert: the visible PL of the investigated crystals under UV excitation.

Figure 4

Figure 4

Low-temperature absorption (black) and PL (red) spectra of a KTF crystal under Hg lamp excitation. The PL data measured at T = 3 K [19] are shown as a dotted line for comparison. Peaks in the spectra are indicated by numbers.

Figure 5

Figure 5

The scheme of Tb3+ optical transitions in a KTF crystal, constructed according to the absorption (blue arrows) and PL (red arrows) spectra at T = 90 K. The diagrams of magnetically–optically active transitions in Tb3+ ions, realized in the magnetic field H in the low-temperature spectra of MCD and MCPL, are shown on the right parts.

Figure 6

Figure 6

Spectral dependences of the MCD (red solid) and optical absorption (black line) of the KTF crystal at T = 90 K. The MCD spectrum is recorded in a magnetic field H = 5 kOe. The characteristic features of the MCD and absorption spectra are indicated in accordance with the transition scheme (Figure 5). The insert shows the result of the superposition of two opposite (in sign) spectral dependences of the MCD corresponding to the “diamagnetic” contributions to the MCD in the studied spectral region.

Figure 7

Figure 7

The spectra of the degree of MCPL (red solid) and PL (black line) of the KTF crystal at a temperature of T = 90 K in the visible spectral region. The MCPL spectrum is recorded in a magnetic field H = 5 kOe. The characteristic features of the spectra are numbered in accordance with the transitions scheme shown in Figure 5.

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