title: 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 K2O-Nb2O5-SiO2-Eu2O3 (KNbSiEu) glasses prepared by the melt quenching technique. By using the Judd-Ofelt (JO) theory, the intensity parameters Ωλ (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)D0 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)D0→(7)F2 transition could be used for the development of optical display devices.
authors.affiliation: Department of Physics, Sri Venkateswara University, Tirupati 517 502, India.
authors.forename: M
authors.initials: M
authors.lastname: Murali Mohan
authors.forename: L
authors.initials: L
authors.lastname: Rama Moorthy
authors.forename: D
authors.initials: D
authors.lastname: Ramachari
authors.forename: C K
authors.initials: CK
authors.lastname: Jayasankar
mesh_terms: D002412:Cations / Q000032:analysis; D003116:Color; D005063:Europium / Q000032:analysis*; D005453:Fluorescence; D005898:Glass / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013059:Spectrum Analysis, Raman
chemical_list: D002412:Cations; D010087:Oxides; D017680:Potassium Compounds; D009556:Niobium; D005063:Europium; C068440:potassium oxide; D012822:Silicon Dioxide; C073337:niobium pentoxide
keywords: Color coordinates; Decay rate; Eu(3+) ions; Judd–Ofelt theory