title: Spectroscopy and upconversion of Dy3+ doped in sodium zinc phosphate glass.
abstract: Optical absorption and fluorescence spectra of Dy3+ doped in sodium zinc phosphate glasses have been reported. Judd-Ofelt theory has been applied to analyze the spectra and determine the optical parameters such as transition probabilities, radiative lifetime, stimulated emission cross-section, etc. The fluorescence intensity of Dy3+ corresponding to 4F9/2-->6H13/2 transition increases with increasing concentration of Dy3+ but at higher concentrations, concentration quenching is observed. The radiative lifetime of the 4F9/2 level at 1 mol% concentration of Dy3+ in this host is found to be 541 micros. Emission corresponding to 4F9/2-->6H13/2 transition (570 nm) is observed on excitation with NIR radiation due to upconversion. An attempt is made to explain this observation.
authors.affiliation: Laser Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005, India.
authors.forename: Garima
authors.initials: G
authors.lastname: Tripathi
authors.forename: Vineet Kumar
authors.initials: VK
authors.lastname: Rai
authors.forename: S B
authors.initials: SB
authors.lastname: Rai
mesh_terms: D004419:Dysprosium / Q000737:chemistry*; D004735:Energy Transfer; D005898:Glass / Q000737:chemistry*; D049449:Luminescence; D008956:Models, Chemical; D010710:Phosphates / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D010710:Phosphates; D017967:Zinc Compounds; D004419:Dysprosium; C043952:zinc phosphate; D012964:Sodium