The crystal structure, energy transfer and tunable luminescence properties of NaLaMgWO 6:Tm 3+, Eu 3+phosphors

A series of NaLaMgWO 6 :Tm 3 + , Eu 3 + phosphors with color-tunable emission were successfully synthesized by the solid-state reaction method. The crystal structure, luminescence characteristics and energy transfer of NaLaMgWO 6 :Tm 3 + , Eu 3 + phosphors have been studied. It is observed that Tm 3 + singly doped phosphors exhibit intense blue emission at 484 nm, and Eu 3 + singly doped phosphors emit red light at 621 nm. The phosphors codoped with Tm 3 + , Eu 3 + exhibit fluorescence spectra composed by the characteristic emission peaks of Tm 3 + ions and Eu 3 + ions. A tunable emission color from blue to red can be obtained by adjusting the ratio of the doping concentration of Tm 3 + /Eu 3 + , indicating a significant energy transfer from Tm 3 + to Eu 3 + . The energy transfer mechanism between Tm 3 + -> Eu 3 + in the NaLaMgWO 6 :Tm 3 + , Eu 3 + phosphors is proved to be a quadrupolequadrupole interaction. These results show that NaLaMgWO 6 :Tm 3 + , Eu 3 + phosphors may have a potential application in white light emitting diodes.