Extraordinary temperature shifts and site-dependent linewidths of the Eu3+5D07F1 emission lines of Eu0.36Tb0.64P5O14

S. Meirman, I. Laulicht

Research output: Contribution to journalArticlepeer-review

Abstract

A reduction of the crystal electric field (CEF) splitting of the 7F1 multiplet of Eu3+ with decreasing temperature is observed. This extraordinary phenomenon is similar to the analogous pressure-induced reduction of the CEF splitting of this multiplet. It is unlikely that the temperature effect is due to a temperature-induced approach toward high symmetry because a temperature decrease is known to lower the site symmetry. Resonant electron-phonon interactions between the 7F1 states and optical phonons with similar energies which result in a repulsion of the lowest 7F1 state toward higher energy may be the origin of the pressure and temperature effects. A plot of the time-resolved fluorescence line-narrowing linewidths of the 5D07F1(ε{lunate}0) transition vs. excitation energy have a minimum at the absorption peak value. This minimum can be explained either by an accidental coincidence in the excitation energy of ions at different sites or by different rates of excitation transfer to acceptors when the donors are excited via the center or via the wings of the absorption profile.

Original languageEnglish
Pages (from-to)329-337
Number of pages9
JournalJournal of Luminescence
Volume43
Issue number6
DOIs
StatePublished - Aug 1989

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