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[Display omitted] • La 2 NiMnO 6 exhibits semiconductor behavior. • Stable ground state of La 2 NiMnO 6 is ferromagnetic. • Band gaps were found to be 0.99 eV (spin-up) and 1.24 eV (spin-down) with GGA-PBE. • 1.41 eV (spin-up) and 1.52 eV (spin-down) with GGA-mBJ. • Optical properties, such as electron energy loss, absorption, and conductivity. In this paper, we examined the La 2 NiMnO 6 double perovskite oxide semiconductor materials, our treatment included the structural, electronic, magnetic, and optical characteristics by utilizing the density functional theory, which was performed in the Wien2k software. The exchange–correlation potential was carried out in combination with the GGA-PBE (Perdew Burke Ernzerhof Generalized Gradient Approximation), and GGA + mBJ (modified Becke and Johnson) was used for the exchange–correlation potentials. The results suggest that the compound La 2 NiMnO 6 exhibits in a ferrimagnetic state. It was also found that the stable ground state of the compound is ferrimagnetic. The results demonstrate that La 2 NiMnO 6 has a band gap whose spin-up value is 0 eV and spin-down (dn) value is 2.86 eV (GGA-PBE), with up values is 0 eV and dn value being of 3 eV (GGA + mBJ). We also explored different optical properties, among them electron energy loss, absorption coefficient, real and imaginary dielectric tensor, and real and imaginary optical conductivity. [ABSTRACT FROM AUTHOR]