Charge compensating defects study of YbF‐doped BaF crystals using dielectric loss

Abstract

YbF3‐doped BaF2 crystals with various concentrations of YbF3 (0.05, 0.1, 0.17, 0.2 mol%) have been grown using the conventional Bridgman method. Dielectric relaxation is used to study the charge compensating defects in BaF2 crystals with low YbF3 concentration. The optical absorption spectra reveal the existence of both Yb2+ (in UV domain) and Yb3+ (in IR domain) ions. In the investigated temperature range (150–320 K) we have observed only one type of dielectric relaxation. This relaxation with activation energy E=0.54 eV is associated with trigonal‐type (C3v) centers. The charge compensating defects are discussed while taking also into account the optical absorption spectra and the calculated number of NNN dipoles whose relaxation is observed.

Luminescence Properties and Judd–Ofelt Analysis of Various ErF3 Concentration-Doped BaF2 Crystals

“…Overall, the behavior shows a parabolic aspect (but of two kinds), as seen in Figure 9 a. Other authors [ 3 , 4 , 6 , 29 ] also reported this behavior.…”

“…Overall, the behavior shows a parabolic aspect (but of two kinds), as seen in Figure 9a. Other authors [3,4,6,29] also reported this behavior. The majority of studies regarding luminescence RE ion-doped BaF2 v refer to emissions obtained mainly by pumping in the IR domain [14][15][16].…”

“…Using a site-selective laser excitation method, Wells [ 3 ] proved that, in the case of BaF 2 , the dominant center has C 3v symmetry for low ErF 3 concentrations (<0.1 mol%). The dielectric relaxation studies [ 4 , 5 , 6 , 7 ] also pointed out that only trigonal C 3v ( NNN ) centers are created.…”

Distribution of Yb3+ and Yb2+ Ions along YbF3‐Doped BaF2 Crystals

“…The CaF 2 host favors the formation of tetragonal sites, BaF 2 encourages trigonal sites, and SrF 2 may contain a mixture of both. Dielectric relaxation investigations showed that at low YbF 3 concentrations (<0.3 mol%), the peak at 968 nm corresponds to C 3v trigonal center. In our BaF 2 :YbF 3 crystals, the strongest absorption peaks appear at 928 nm (O h , cubic symmetry) and at 968 nm (C 3v , trigonal symmetry).…”

Influence of Na+, Ca2+ and R3+ (R = Y, Lu, Gd) co-doping on the spectroscopic properties of Pr3+:BaF2 single crystal

“…When the dominant center is C 3v site symmetry, the interstitial F − ions of charge compensation will occupy the sub-nearest neighboring position in a [1 1 1] direction around a RE 3+ ion. 25,26 However, the spectral properties of Pr 3+ ion-doped BaF 2 crystals and spectral modulation effect by different valence state buffer ions have not been discussed yet.…”