Optical spectroscopic study of Eu^3+ crystal field sites in Na_3La_9O_3(BO_3)_8 crystal

Abstract

Time-resolved line-narrowed fluorescence spectroscopy of Eu 3+ ions in a new oxyborate Na 3 La 9 O 3 (BO 3 ) 8 crystal shows the existence of four independent symmetry crystal field sites for the rare-earth ion. A crystal field analysis and simulation of the experimental results have been performed in order to parametrize the crystal field at the Eu 3+ sites. A plausible argument about the crystallographic nature of these sites is given.

Photoluminescence and Raman Spectroscopy Studies of Eu(OH)3 Rods at High Pressures

“…In addition, a new small emission peak at 621 nm (shown in Figure ) that corresponds to the 5 D 0 − 7 F 2 transition is also observed above 4 GPa. Therefore, it can be deduced that the new site symmetry of Eu 3+ ions is lower (such as in orthorhombic ( D 2 , C 2 v ), monoclinic ( C 2 , C S ), or triclinic ( C 1 ) structures) at pressures higher than 4 GPa. ,, To determine the new site symmetry of Eu 3+ ions at 4−8 GPa, the 5 D 0 → 7 F 0 transition of Eu(OH) 3 rods at different pressures has been checked and summarized in Figure . Although the intensity of this transition is very weak as compared with that of the 5 D 0 → 7 F 1,2 transitions at the same pressure, some information can still be obtained.…”

Insights into the complexity of the excited states of Eu-doped luminescent materials

“…It features a characteristic red or orange emission, underlying its successful application in fluorescent lighting 114 . Furthermore, the low J-values of the multiplets that take part in the luminescent transitions make this ion suited as a symmetry probe [115][116][117][118][119] . Notwithstanding the successes of Eu 3+ , a satisfying analysis of its spectrum is not always possible, due to too small crystal field splittings, which is especially troublesome in case of high coordination numbers, low transition strength, or the need for polarized spectra to distinguish between different point symmetries.…”

Time-resolved fluorescence line-narrowing of Eu^3+ in biocompatible eutectic glass-ceramics

“…Since 5 D 0 state is non-degenerate under any symmetry, the structure of the 5 D 0 → 7 F J emission is only determined by the splitting of the terminal levels caused by the local crystal field. Moreover, as the 7 F 0 level is also non-degenerate, siteselective excitation within the 7 F 0 → 5 D 0 absorption band can be performed by using fluorescence line narrowing (FLN) spectroscopy in order to distinguish among different local environments around the Eu 3+ ions [17][18][19].…”