Spectroscopic investigation and optical characterization of Eu3+ ions in K–Nb–Si glasses

Abstract This paper reports on the effect of concentration of Eu 3+ ions in K 2 O–Nb 2 O 5 –SiO 2 –Eu 2 O 3 (KNbSiEu) glasses prepared by the melt quenching technique. By using the Judd–Ofelt (JO) theory, the intensity parameters Ω λ ( λ  = 2, 4, 6) have been determined from the absorption and emission spectra of Eu 3+ ions under different constraints. The radiative properties of some of the excited states of Eu 3+ ions have been calculated. The decay curves of 5 D 0 level exhibited single exponential for all the Eu 3+ ions concentrations. From these results, it is suggested that the strong red emission at 616 nm corresponding to the 5 D 0  →  7 F 2 transition could be used for the development of optical display devices.