Optical properties of Tb3+-doped Rb2KInF6 elpasolite

Vacuum ultraviolet excitation spectra of lanthanide-doped hexafluoroelpasolites

“…Only three electronic transitions are expected in this region [110] and these can be assigned to the three groups of bands. Three features were observed in the same region in the 7 K absorption spectrum of Rb 2 KInF 6 :Tb 3+ (1%) but in that case the Tb 3+ ion is situated at a distorted octahedral site [101]. In figure 2(e), the highest energy group of spin-forbidden bands (246.5-252.6 nm) is the most clearly resolved and the initial ν s (Tb-F) vibrational quantum based upon the ZPL is ∼475 cm −1 , compared with the ground state value of 468 cm −1 [92].…”

“…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.…”

“…The ion Tb 3+ exhibits 4f 8 -4f 7 5d excitation bands above ∼37 000 cm −1 in the Rb 2 KInF 6 host (which undergoes a phase transition at low temperature so that the Tb 3+ site symmetry is lowered to C 2v [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.…”

Interionic cross relaxation and tunable color luminescence in KY3F10:Tb3+ nano/microcrystals synthesized by hydrothermal approach

“…Therefore, Tb 3+ activated phosphors with tunable emitting colors can be achieved by choosing a low phonon frequency host. We summarize the reported tunable color luminescence in Tb 3+ doped materials [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41], as shown in Table 1. The approximate values of the phonon frequency in some oxides containing ionic complexes and fluoride compounds have been reported, such as borates ($1300 cm À1 ), phosphates ($1200 cm À1 ), silicates ($1050 cm À1 ), tungstates ($900 cm À1 ), aluminates ($850 cm À1 ), fluorides ($450 cm À1 ).…”

“…Fig. 3 shows the PL spectra of KY 3 F 10 :Tb 3+ with different Tb 3+ concentrations under 218 nm excitation, where the intensities of the blue Halide compounds Ca 6 Ln 2 Na 2 (PO 4 ) 6 F 2 (Ln = Gd, La) [34] Rb 2 KInF 6 [35] b-NaYF 4 [36] K 2 YF 5 [37] ZBLAN [38] a-GdOF [39] CsMgCl 3 [40] CsMgBr 3 [40] CsCdBr 3 [40,41] emission originating from 5 D 3 are normalized. At low concentrations of Tb 3+ , the blue emissions from the 5 D 3 level are dominant in the fluorescence spectra, indicating that the 5 D 3 level is effectively populated when excited at 4f 7 5d configuration.…”