Vacuum-ultraviolet5d−4fluminescence ofGd3+and

M. Kirm

¹

,

G. Stryganyuk

²

,

S. Vielhauer

³

et al.

Abstract

The VUV 4f n−1 5d-4f n luminescence and luminescence excitation spectra of Gd 3+ ͑n =7͒ in LiGdF 4 , GdF 3 , LiYF 4 :Gd 3+ , and YF 3 :Gd 3+ , and of Lu 3+ ͑n =14͒ in LiLuF 4 , LuF 3 , and LiYF 4 :Lu 3+ have been analyzed with high spectral resolution. In systems with intermediate electron-phonon coupling, zero-phonon lines, and phonon sidebands were observed. The excitation spectra of dilute systems exhibit rich fine structure originating from electronic origins of transitions and their phonon replica. Theoretical calculations explicitly taking into account a microscopic model of the crystal field and the crystal lattice vibrational spectra agree well with experimental data and are the basis for a safe analysis of the spectra.

5f−6dorbital hybridization of trivalent uranium in crystals of hexagonal symmetry: Effects on electronic energy levels and transition intensities

“…With the values of the overlapping integrals, the values of eight crystal-field parameters have been calculated ͑Table I͒ with G s = G = 1 and G = 0.1. 40 The calculated values of the crystal-field parameters for 5f 3 are in good agreement with those previously obtained ͑Table II͒ and from spectrum fitting conducted in this work except for B 0 4 ͑f f͒ which is about two times of the fit value. Similar discrepancies were realized previously for lanthanide 4f systems.…”

Spectral-kinetic characteristics of Pr3+ luminescence in LiLuF4 host upon excitation in the UV–VUV range

“…However, the recent calculations for 4f N -4f NÀ1 5d transitions of RE 3+ ions in LiYF 4 [10][11][12][13] show rather good agreement with experimental results. Present paper reports on the time-resolved high-resolution (3.2À0.6 Å ) study of Pr 3+ luminescence in LiLuF 4 :Pr(0.1 mol%) single crystal upon the excitation within 5-12 eV range at T ¼ 8 K.…”

Concentration dependence study of VUV–UV–visible luminescence of Nd3+ and Gd3+ in LuLiF4

“…3 is displayed in Fig. 4 and it reflects plentiful level structure of Gd 3+ transitions, see also [12]; the position of the band edge at about 126 nm is consistent with [13,14].…”