Luminescence Properties of Tb~(3+), Eu~(3+), Tm~(3+) Co-Doped Na_5La(MoO_4)_4 for White Light-Emitting Diode

摘要

Tb~(3+), Eu~(3+), Tm~(3+) co-doped Na_5La(MoO_4)_4 phosphors were prepared by the conventional solid-state reaction. Under the excitation of UV light, Na_5La(MoO_4)_4:Tm~(3+), Na_5La(MoO_4)_4:Tb~(3+), and Na_5La(MoO_4)_4:Eu~(3+) exhibit the characteristic emissions of Tm~(3+) (~1D_2 → ~3F_4, blue), Tb~(3+) (~5D_4 → ~7F_5, green), and Eu~(3+) (~5D_0 → ~7F_2, red), respectively. By adjusting the doping concentration of rare earth ions in Na_5La(MoO_4)_4:a Tm~(3+), b Tb~(3+), c Eu~(3+), a white emission in a single composition was obtained under the excitation of 362 nm. It might be a promising phosphor for the future applications.