Influence of rare earth elements (Y, Gd and Lu) on the luminescent properties of green phosphor ZnMoO₄:Tb³⁺

Abstract

(Zn,Lnx )MoO4 :Tb(3+) (Ln = Y(3+), Gd(3+) and Lu(3+) ) were prepared using the co-precipitation method. Phase impurity, morphology and composition were investigated by power X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The experimental results show that crystal structure is not destroyed after doping an appropriate amount of Y(3+), Gd(3+) and Lu(3+). EDS analysis reveals that Y, Gd and Lu have been successfully doped into ZnMoO4 . In addition, the morphology of the phosphors is notably improved, exhibiting homogeneous dispersion morphology and irregular shapes of particle size ~ 0.5-1 µm. The luminescent intensity of (Zn,Lnx )MoO4:Tb(3+) (Ln = Y(3+), Gd(3+) and Lu(3+)) phosphor is obviously higher than that of ZnMoO4 :Tb(3+) phosphor. The energy transfer process between trivalent rare earth ions indicates that the inert earth ions can act as an energy bridge from MoO4(2-) to Tb(3+).

Yolk–shell structured Gd2O3:Eu3+ phosphor prepared by spray pyrolysis: the effect of preparation conditions on microstructure and luminescence properties

“…10,11 Among the materials used for these applications, rare-earth activated oxide compounds with high-performance luminescence play a key role in producing high-quality end products. [12][13][14][15][16][17][18] The advent of advanced display technologies requires highly photoluminescent phosphors that are thermally stable, exhibit desired emitting colors, and have suitable decay times. [19][20][21] These properties are generally affected by physical characteristics of the phosphor particles such as particle size, morphology, and crystallinity.…”