We present the results of theoretical study of photoluminescence of Eu2+ ions activated chlorophosphate M-5.17(PO4)(3)Cl-5:Eu2+ with M = Ca, Sr and Ba estimating electron-vibrational interaction (EVI) parameters such as Huang-Rhys factor, effective phonon energy, Stokes shift and zero phonon line position. Validity of the calculated result was established by modeling the emission line which was found to be in good agreement with the measured photoluminescence spectrum of Eu2+ doped chorophosphates. (C) 2014 Published by Elsevier B.V.