Analysis of the electron-vibrational interaction in the 5d states of Eu2+ ions in LiSrPO4 host matrix

Highlights: • Sol-gel synthesis of LiSrPO₄:Eu²⁺ phosphor. • Electron-vibrational Interaction (EVI) parameters determined by spectrum-fitting method. • Exceptional thermally stable luminescence up to 100 °C. • Potential application as UV-pumped blue-emitting phosphor in LEDs. -- Abstract: Different concentrations of Eu²⁺ doped LiSrPO₄ phosphors were synthesized by a sol-gel/Pechini method. The photoluminescence (PL) excitation and emission spectra were recorded for all the samples and the optimum photoluminescence (PL) intensity was obtained for the 5 mol% sample. The Rietveld refinement method was performed on the optimum sample structure. Electron-vibrational interaction parameters were evaluated using a spectrum-fitting method. The International Commission on Illumination chromaticity coordinates were located in the blue region, indicating the possibility of employing this phosphor as a blue-emitting component in Ultraviolet-pumped light emitting diode.