Abstract
For the first time, Li3Ba2Gd3−x(MoO4)8:x Eu3+ (x = 0.01, 0.03, 0.05, 0.07 and 0.09 mol) red phosphor nanoparticles were prepared using the simple mechanochemically assisted direct solid state reaction method at room temperature and the luminescence effects as a function of Eu3+ ion concentration were studied. The characteristics of the phosphor materials were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence and kinetic decay. For 7 mol% of Eu3+ concentration, the phosphor exhibits a strong excitation peak at 395 nm signifying a strong absorption. The PL emission spectra of Li3Ba2Gd3 (MoO4)8:0.07 Eu3+ phosphors exhibited an intense peak at 615 nm (red) which relates to 5 D 0 → 7 F 2 transition of Eu3+. The most favourable Eu3+ concentration in Li3Ba2Gd3 (MoO4)8 phosphors for intensified red emission results for 7 mol% and above this concentration, the emission intensity falls off as a result of quenching effect. The CIE color coordinates of the Li3Ba2Gd3 (MoO4)8:0.07 Eu3+ red phosphor coexist very well with the standard values of NTSC. The red emission intensity of the as prepared Li3Ba2Gd3 (MoO4)8:0.07 Eu3+ red phosphor is 3.2 times better than that of the commercial Y2O2S:Eu3+ red phosphor prepared by the conventional solid state reaction method.
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