Energy levels of terbium(III) in the elpasolite Cs2NaTbF6

Emission spectra of lanthanide ions in hexafluoroelpasolite lattices excited by synchrotron radiation

“…There is guide to the band assignments for Table 1 and compared with those for the analogous chloride [25]. For electric dipole allowed transitions, the emission from 4 G 5/2 is allowed by the rank-2 effective transition operator characterized by parameter X 2 to multiplets 6 H J (2J = 5, 7, 9) by the angular-momentum selection rule, and rank-4 and rank-6 operators to more multiplets. This is shown by the cases of LiYF 4 :Sm 3+ [23] and Sr 5 (PO 4 ) 3 F:Sm 3+ [24], where the greatest intensity arises from X 2 in the electric dipole pure electronic transitions to 6 H 9/2 .…”

“…In the present study, the emission spectra of the tripositive ions of Sm, Gd, Tb, Ho, and Er excited by synchrotron radiation at $10 K are presented and detailed interpretations are provided where possible. There have been some previous 4f N -4f N emission results reported for hexafluoroelpasolite systems comprising Nd 3+ [3], Eu 3+ [4], Tb 3+ [5,6], Er 3+ [7], Tm 3+ [8], and Yb 3+ [9], and experimental results and/or theoretical simulations of 4f N M 4f NÀ1 5d spectra were reported for Ce 3+ [10,11], Pr 3+ [12], Nd 3+ [3], Er 3+ [13], and Tm 3+ [13,14]. [4].…”

Vacuum ultraviolet excitation spectra of lanthanide-doped hexafluoroelpasolites

“…It is not clear whether the band at 225 cm −1 in the present case corresponds to the maximum of unresolved bands, or to a single feature. The frequency is higher than the ground state t 2g moiety mode in Cs 2 NaTbF 6 (194 cm −1 [92]). The lowest energy group of spin-forbidden bands (between 260 and 268 nm) is broader with a separation of ∼472 cm −1 .…”

“…were obtained from a new fitting of the energy levels reported for Cs 2 NaTbF 6 by Berry et al [92]. The parameters for Er 3+ [93] and Tm 3+ [94] were used for the host-insensitive free ion [105] by the factor of 1.25 [106] and then decreasing it appropriately across the series using the same ratio as for CaF 2 [19].…”

“…The magnetic properties [87], vibrational spectra [88] and intraconfigurational 4f N -4f N spectra of Nd 3+ [89], Eu 3+ [90,91], Tb 3+ [92], Er 3+ [93], Tm 3+ [94] and Yb 3+ [95,96] [3,101]) although a spectral interpretation was not given [3,99]. The 4f N -4f N −1 5d spectra of Nd 3+ [89], Er 3+ [102] and Tm 3+ [102,103] in the Cs 2 NaYF 6 host have been previously reported and are subsequently referred to with respect to the spectra obtained herein.…”