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, Li₃Ba₂Gd_3−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.