Analysis of electron-vibrational interaction in the 5d states of Eu<sup>2+sup> ions in A<sub>3sub>P<sub>4sub>O<sub>13sub> and A<sub>3sub>(PO<sub>4sub>)<sub>2sub> (A=Sr, Ba) phosphors
Eu2+ emission is studied in two types of phosphates A3P4O13 and A3(PO4)2 (A=Sr, Ba). Comparative analysis of EVI parameter was done for Barium- and Strontium- based phosphates. Huang-Rhys factor and effective phonon energies shows intermediate coupling of electron-vibration interaction.