Enhanced photoluminescence of Li3Ba2Gd3 (MoO4)8:Eu3+ red phosphor synthesized by mechanochemically assisted direct solid state reaction method at room temperature

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.