Optical characterization of Eu³⁺ doped MLSiO₄ (M = Ca, Sr, Ba and L = Mg) phosphor materials for display devices

Mixed metal oxide based phosphors of Eu³⁺ doped MLSiO₄ (M = Ca, Sr, Ba and L = Mg) type were explored using sol–gel process. Optical characteristics of different compositions of calcium magnesium silicate including CaMg_(0.97)SiO₄, Ca_(0.97)MgSiO₄ and Ca_(0.985)Mg_(0.985)SiO₄ phosphor materials were investigated in detail prepared with 0.03 molar concentration of europium ion. Emission spectra of these materials presented dominant peak at 613 nm because of electric dipole (⁵D₀ → ⁷F₂) transition of Eu³⁺ ion. Red luminescence in the silicate phosphors was due to the presence of Eu³⁺ ion in their lattice. Effect of variation of metal ion (M = Ca, Sr and Ba) on the optical properties of MLSiO₄ (L = Mg) materials was also explained in the present report. Particle size of the prepared materials was computed using Debye Scherrer’s equation from X-ray diffraction analysis. Different crystal structures were examined from diffraction pattern available for these materials. Chemical structure as well as bonding present in these phosphor materials was analyzed from Fourier Transform Infrared study. Microscopic tool including transmission electron microscope was applied to approximate the particle size of prepared materials. Excellent photoluminescence response and nanosize of these materials made them suitable in display device technology.