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- W2053345217 abstract "The optical properties (emission, excitation and lifetime data) of CaF2 slightly contaminated with Eu2+ and Mn2+ ions have been analysed in the present investigation. The optical properties of the systems CaF2:Eu2+ and CaF2:Mn2+ have also been studied in order to obtain a better characterisation of the optical properties of the CaF2:Eu:Mn phosphor material. The spectroscopic data obtained clearly indicate that energy transfer from the donor Eu2+ ions to the acceptor Mn2+ ions takes place in CaF2 even at the very low impurity concentrations employed in the authors' samples, suggesting therefore that the impurities are not randomly distributed in the lattice but rather occur as impurity clusters of Eu2+ to Mn2+. Some insight into the possible nature of the impurity complexes as well as of the Eu to Mn energy transfer mechanism taking place inside them were gathered with the help of Dexter's theory for energy transfer phenomena. The results presented in this paper give support to the ionic radius criterion proposed by Rubio et al. (1985-9) to predict impurity pairing in a solid material." @default.
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- W2053345217 date "1990-07-09" @default.
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- W2053345217 title "Luminescence and energy transfer in CaF<sub>2</sub>slightly doped with europium and manganese" @default.
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- W2053345217 doi "https://doi.org/10.1088/0953-8984/2/27/011" @default.
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