Energy transfer and optical properties of NaLaMgWO 6 :Dy 3+ , Tb 3+ phosphors

In this study, we have prepared several NaLaMgWO 6 :Dy 3+ , Tb 3+ phosphors using a high-temperature solid-phase method. X-ray diffraction (XRD) and photoluminescence (PL) were used to analyze the physical phase and luminescent characteristics of these materials. Our results showed that in the NaLaMgWO 6 : x Dy 3+ phosphor, an ideal doping concentration of x = 8.0 mol% was discovered, which gave off a noticeably yellowish emission band. In NaLaMgWO 6 : y Tb 3+ phosphor, the optimal doping concentration of Tb 3+ ions were y = 10 mol%. Dy 3+ and Tb 3+ singly doped phosphors showed significant yellow and green emission at 574 nm and 547 nm, corresponding to the 4 F 9/2 → 6 H 13/2 transitions of Dy 3+ and the 5 D 4 → 7 F 5 transitions of Tb 3+ , respectively. In the NaLaMgWO 6 :Dy 3+ , Tb 3+ phosphor, energy transfer was observed, and the mechanism behind it was thoroughly described. Furthermore, the color of the NaLaMgWO 6 phosphor could be adjusted from yellowish to greenish by varying the Dy 3+ /Tb 3+ ratio in concentration. These findings demonstrate that co-doped NaLaMgWO 6 phosphors containing Dy 3+ and Tb 3+ hold great potential for use in gadgets with fluorescent displays.