Abstract
The Eu3+ ion occupies two different crystallographic sites in (Y1−xEux)2O3 and (Gd1−xEux)2O3, with site symmetry S6 and C2. Energy transfer over more than 7 Å occurs from Eu3+ (S6) ions to Eu3+ (C2) ions. This is shown to be a direct one-phonon assisted process, in combination with a one-site resonant
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