Electron-vibrational interaction in 5d state of Eu2+ ion in LiMgBF6, Li2NaBF6 and Li3BF6:Eu2+ phosphors

► Complex hexafluorides were studied to estimate electron-vibrational interaction (EVI) parameters. ► EVI parameters mainly Huang-Rhys factor, effective phonon energy, stokes shift and zero phonon line position were reported. ► Validity of EVI was established by modeling the emission line. ► EVI modeling was found to be in good agreement with experimental PL spectra.