Energy transfer between Eu3+ ions in a lattice with two different crystallographic sites: Y2O3:Eu3+, Gd2O3:Eu3+ and Eu2O3

Abstract

The Eu3+ ion occupies two different crystallographic sites in (Yr _XEu,),03 and (Gdt_ XEu,),03, with site symmetry S, and C,. Energy transfer over more than 7 A occurs from Eu3+ (S,) ions to Eu3+ (C,) ions. This is shown to be a direct one-phonon assisted process, in combination with a one-site resonant two-phonon assisted process at higher temperatures. For x = 1 there is energy migration over the Eu 3+ (C,) sublattice to quenching impurities. The presence of cooperative absorption points to superexchange interaction between the Eu3+ ions.

Interpretation of europium(III) spectra

“…In general, the condition of site isolation of site isolation is fulfilled in (dilute) solutions, but often not in highly doped solids [698][699][700]. This intermetallic EuEu energy transfer limits the usefulness of the Eu 3+ as structural probe because it makes the assignments of Eu 3+ uncertain since in that case the emitting site is not necessarily the same as the excited site.…”

Preparation and Luminescence of Europium-doped Yttrium Oxide Thin Films

“…As already confirmed in the above XRD analysis, the Y 2 O 3 :Eu films consist of cubic α-Y 2 O 3 crystallites. The cubic α-Y 2 O 3 structure has a space group symmetry with two different crystallographic sites, i.e., C 2 and S 6 sites [14]. The C 2 site has relatively poor inversion symmetry, but the S 6 site has perfect inversion symmetry.…”

pH Dependent Hydrothermal Synthesis and Photoluminescence of Gd2O3:Eu Nanostructures

“…1b and 1c) and the cubic (space group Ia3; Fig.1d) phases respectively. (JCPDS card 83-2037; Buijs et al, 1987) While Gd(OH) 3 :Eu obtained at pH ~ 8 is well crystallized, the increase of solution pH to ~ 11 and ~ 13 results in a relatively weak and broad intensity patterns, indicating a poorer crystallinity. The full-widths at halfmaximum (FWHM) of the (110), (101), (201) reflections of Gd(OH) 3 :Eu obtained at pH ~ 8 are smaller than one half in comparison with those obtained at pH ~ 11.…”