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Two series of Dy3+:NaTb(WO4)2 and Dy3+:NaGd(WO4)2 phosphors doped with different Dy3+ concentrations were prepared by the solid-state reaction method. Dy3+-> Tb3+ energy transfer and fluorescence properties of Dy3+:NaTb(WO4)2 phosphors doped with different Dy3+ concentrations were firstly investigated by exciting at 455 nm. Strong Tb3+ green fluorescence around 545 nm was observed in the Dy3+:NaTb(WO4)2 phosphors due to the efficient Dy3+-> Tb3+ energy transfer. Excited at 455 nm, polarized spectroscopic properties of a (9.28 at.%) Dy3+:NaTb(WO4)2 crystal grown by the Czochralski method were studied at room temperature. The peak ab-sorption cross-sections of the crystal at 454.6 nm, corresponding to the 6H15/2 -> 4I15/2 transition of Dy3+ , are 2.74 x 10-21 and 3.93 x 10-21 cm2 for sigma and pi polarizations, respectively. The peak emission cross-sections of the crystal, corresponding to the 5D4 -> 7F5 transition of Tb3+ , are 5.6 x 10-21 at 545 nm and 11.5 x 10-21 cm2 at 548.6 nm for sigma and pi polarizations, respectively. Tb3+ green fluorescence around 545 nm was obviously enhanced in the crystal excited at 455 nm due to the Dy3+-> Tb3+ energy transfer. The results show that Dy3+ can be used as sensitizing ions to enhance the visible fluorescence of Tb3+ in the NaTb(WO4)2 phosphor and crystal excited at 455 nm.
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JOURNAL OF LUMINESCENCE
ISSN: 0022-2313
Year: 2023
Volume: 257
3 . 3
JCR@2023
3 . 3 0 0
JCR@2023
ESI Discipline: PHYSICS;
ESI HC Threshold:30
JCR Journal Grade:2
CAS Journal Grade:3
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