Spectroscopic investigations and phonon side band analysis of Eu3+-doped multicomponent tellurite glasses

Abstract Novel and optically efficient multicomponent tellurite glasses doped with Eu 3+ ions were prepared by melt quenching procedure. Absorption, photoluminescence excitation, emission and Raman spectra analyses of the Eu 3+ -doped glasses have been carried out. Spectroscopic studies were performed with the Judd-Ofelt and phonon side band analyses. The local vibrational mode around Eu 3+ ions and the phonon energy of the prepared tellurite glasses was estimated by the phonon side band (PSB) associated with 7 F 0 → 5 D 2 transition of Eu 3+ ion. Both the phonon energy ( ћω ) and the electron-phonon coupling constant ( g ) were derived from the phonon side band spectrum. Radiative properties such as spontaneous transition probabilities ( A T ), radiative lifetime (τ R ) and luminescence branching ratio ( β R ) ratio were calculated for different excited states. Five pronounced peaks have appeared in the photoluminescence spectra (PL) as a result of the transitions from the metastable 5 D 0 to the ground states 7 F J (J = 0 to 4) of Eu 3+ ions. The red Eu 3+ emission at 612 nm corresponding to the 5 D 0 → 7 F 2 transition is of particular importance and its emission intensity is observed to increase significantly with growing Eu 3+ ion concentration, suggesting that these multicomponent tellurite glasses are suitable candidates for red laser source applications.