Origin of inhomogeneous linewidth of Eu3+ fluorescence in phosphate and borophosphate glasses
1994; Elsevier BV; Volume: 175; Issue: 2-3 Linguagem: Inglês
10.1016/0022-3093(94)90019-1
ISSN1873-4812
AutoresKimihiko Hirao, Shin‐ichi Todoroki, Naohiro Soga,
Tópico(s)Phase-change materials and chalcogenides
ResumoInhomogeneous broadening of Eu3+ fluorescence in phosphate glasses which contain doubly bonded oxygens (DBOs) was investigated. The linewidths for sodium phosphate glasses were relatively small and increased with a decrease in the number of DBOs surrounding Eu3+ ions, which was estimated by phonon sideband measurement. Eu3+ ions in borophosphate glasses are preferentially surrounded by non-bridging oxygens (NBOs) of PO42 tetrahedra even in a 5 mol% P2O5 glass because of the local charge compensation by NBOs. The inhomogeneous linewidth of Eu3+ fluorescence is related to the local flexibility of the glass network. Both the NBO concentration in the matrix and the degree of interpolyhedra linkages surrounding Eu3+ ions are associated with the flexibility of the local glass network.
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