Impact of Substitutional Doping of Eu³⁺ on Optoelectronic Properties of BaMgSiO₄ Phosphor Material: A Tunable Blue‐White Color‐Emitting Phosphor

The structure and the optical properties of the tridymite green color phosphor BaMgSiO 4 :Eu are systematically examined. Due to the differing ion radii of Eu 3+ , Mg 2+ , Si 4+ , and the three different Ba 2+ sites in the crystal lattice, dopants can only replace the Ba 2+ sites because the other sites are insufficiently large to hold the massive Eu 3+ . BaMgSiO 4 is a promising candidate for inorganic photochromatic materials with excellent optical properties. It has attracted much attention in the world due to its applications in high‐density optical memory and light‐emitting diodes. Herein, the generalized gradient approximation and generalized gradient approximation plus Hubbard potential (GGA + U ) are used to investigate the electronic structure and the entire optical properties of the parent and Eu‐doped BaMgSiO 4 , like dielectric function, refractive and extinction coefficients, the optical conductivity, reflectivity, and absorption spectra. It is found that the substitution of Eu ions reduces the energy bandgap of BaMgSiO 4 and introduces the sub‐bands in between the valence and conduction bands. Findings show that the bandgap and optical characteristics of the BaMgSiO 4 compound are described properly by the GGA + U method.