Green Eu2+-doped Ba3Si6O12N2 phosphor for white light-emitting diodes: Synthesis, characterization and theoretical simulation

► This manuscript reports an efficient green Ba3Si6O12N2:Eu2+ phosphor with high quantum efficiency and long-wavelength excitation, which could not be explained by the conventional crystal-field theory. ► Based on the theoretical simulation of its electric structure, it is pointed out for the first time that the Ba in the host lattice gives the main contributions to these excellent luminescent properties. ► These results have implications in the future designation of novel phosphors for white light LED. ► So we strongly believe that this manuscript will be interesting to general readers majoring in novel optical material and luminescence.