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- W1623178671 abstract "The authors have obtained the absorption and emission spectra for the Sm2+ impurity in the mixed fluorides, Ca1-xYxF2+x and Ca1-xLaxF2+x. From these spectra they conclude that the Sm2+ ions tend to be coordinated by one or more extra F- ions in addition to the normal eightfold coordination expected in CaF2. Measurements of the emission lifetime and intensity as a function of temperature lead them to propose that the luminescence quenching of Sm2+ in the mixed fluorides is due to a competition between ionisation of the 4f55d level with relaxation into the 5D0 (4f6) emitting state. In addition, the thermal activation energy for Sm2+ emission quenching in various alkaline-earth halides is consistent with the calculated optical separation of the 4f55d level from the conduction band of the host, lending further support to the ionisation mechanism of emission quenching." @default.
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- W1623178671 date "1987-03-10" @default.
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- W1623178671 title "Optical properties and nonradiative decay of Sm<sup>2+</sup>in CaF<sub>2</sub>-YF<sub>3</sub>and CaF<sub>2</sub>-LaF<sub>3</sub>mixed crystals" @default.
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- W1623178671 doi "https://doi.org/10.1088/0022-3719/20/7/010" @default.
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