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• W1998706850 endingPage "131" @default.
• W1998706850 startingPage "109" @default.
• W1998706850 abstract "In this paper the luminescence of compounds LnTaO4 (Ln = La, Gd, Y and Lu) is reported. A number of rare-earth ions have been substituted for Ln and further Nb for Ta. The fergusonites YTaO4 and LuTaO4 show luminescence in the ultra-violet (maximum at 335 and 325 nm, respectively). The isomorphous GdTaO4 shows no emission. This is ascribed to energy transfer from TaO4 to Gd, followed by concentration quenching. LaTaO4 shows a blue emission at liquid nitrogen or lower temperatures only. The NbO4 group in the fergusonite tantalates is an efficient luminiscent centre. Energy transfer from TaO4 to NbO4 has been observed. Apart from the u.v. (blue) emission the TaO4 (NbO4) group also gives an emission situated at longer wavelengths with a lower quenching temperature. This emission is tentatively ascribed to a triplet-singlet transition. The Bi3+ ion gives a bright blue emission in the fergusonite lattices. The efficiency of the Tb3+ and Eu3+ emission in these compounds is also high. This is related to the position of the broad absorption bands of these centres. Strong evidence is presented that energy transfer from TaO4 to Tb3+ (Eu3+) occurs via the charge-transfer state. For the case TaO4 → Tb the critical distance is estimated to be about 10 Å. Rare-earth ions without strong absorption in the u.v. region (Sm3+, Dy3+, Er3+) do not quench the host lattice emission considerably. Phosphors based on LaTaO4 are not very efficient." @default.
• W1998706850 created "2016-06-24" @default.
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• W1998706850 date "1970-09-01" @default.
• W1998706850 modified "2023-10-15" @default.
• W1998706850 title "Luminescence phenomena in compounds with fergusonite structure" @default.
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• W1998706850 doi "https://doi.org/10.1016/0022-2313(70)90011-6" @default.
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