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- W2023265145 abstract "Abstract The luminescence and energy transfer properties of two lower symmetrical europium tellurite anti-glass phases are reported, viz. Eu 1.79 TeO x , which has a pseudo-tetragonal structure, and Eu 1.08 TeO x , which has a monoclinic ordered crystal structure. In the pseudo-tetragonal phase the Eu 3+ ions occupy two major types of sites. In the monoclinic phase there are at least seven different crystallographic sites available to the Eu 3+ ions. At low temperatures transfer of excitation energy to the sites with the lowest 5 D 0 energy levels occurs, and only these sites luminesce. Above 10 K backtransfer to higher 5 D 0 levels takes place. The energy migration process, which becomes important at temperatures above 20 K for the pseudo-tetragonal phase and above 10 K for the monoclinic phase, is two-phonon assisted. For both compounds the assistance mechanism up to about 50 K is two-site non-resonant, and at higher temperatures it is one-site resonant." @default.
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- W2023265145 date "1989-01-01" @default.
- W2023265145 modified "2023-09-26" @default.
- W2023265145 title "Luminescence and energy transfer in europium Tellurite anti-glass phases" @default.
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- W2023265145 doi "https://doi.org/10.1016/0022-3697(89)90401-0" @default.
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