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Direct bandgap bulk materials are very important for the opticalapplications. It is therefore important to predict new materials with thedesired properties. In the present work, density functional theory is appliedto study different physical properties of X$_2$MgZ$_4$($X=$ Sc, Y; $Z=$ S, Se)spinel compounds. Generalized gradient approximation is used to analyze thestructural and elastic parameters while modified Becke Johnson exchangepotential is applied to calculate electric band profiles and opticalproperties. All the studied compounds are stable in the cubic structure. Alsothe energy bandgap is of direct nature. Therefore these compounds can finduseful applications in the optoelectrics devices. Optical properties of thecompounds are studied in terms of dielectric function, refractive index,extinction coefficient, optical conductivity and reflectivity. The transportparameters like electrical conductivity, Seebeck coefficient, and thermalconductivity are also evaluated.

Insights into the structural, electronic and optical properties of  X$_2$MgZ$_4$($X=$ Sc, Y; $Z=$ S, Se) spinel compounds: Materials for the  future optoelectronic applications