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In the present paper we report on the combined experimental and theoreticalstudy of the Sr6-xEuxBP5O20 (x=0.01; 0.03; 0.05; 0.07; 0.09; 0.11; 0.13; 0.15)phosphors. Details of the samples preparation and spectroscopic measurementsare followed by the analysis of the room-temperature absorption and emissionspectra, which yielded the main parameters of the electron-phonon coupling,such as Huang-Rhys factor, Stokes shift, effective phonon energy, andzero-phonon line position were determined for the first time for the studiedsystem. The obtained parameters were used to model the emission band shapes,which perfectly reproduce the experimental results for all samples.

Electron-vibrational interaction in the 5d states of Eu2+ ions in Sr6-xEuxBP5O20 (x=0.01; 0.03; 0.05; 0.07; 0.09; 0.11; 0.13; 0.15)