title: Spectroscopic properties of Dy(3+) ions in NaF-B(2)O(3)-Al(2)O(3) glasses.
abstract: This paper reports the optical properties of Dy(3+) in sodium fluoroborate glasses of the type XNaF.(89-X)B(2)O(3).10 Al(2)O(3).1Dy(2)O(3) (where X=8, 12, 16, 20 and 24). Judd-Ofelt intensity parameters (Omega(2), Omega(4), Omega(6)) are derived from the absorption spectra. The Judd-Ofelt theory has been applied to interpret the local environment of Dy(3+) ions and bond covalency of RE-O bond. These parameters have been used to calculate radiative transition probabilities (A(rad)), lifetimes (tau(R)) and branching ratios (beta(R)) for the excited level (4)F(9/2). The predicted values of tau(R) are compared with the measured values for (4)F(9/2) level for five glass compositions (Glass (A-E)). The stimulated emission cross-section sigma(lambda(P)) are also evaluated for the (4)F(9/2)-->(6)H(J) (J=11/2, 13/2, and 15/2) transitions.
authors.affiliation: Department of Physics, Vellore Institute of Technology, Vellore 632014, India. drazeem2002@yahoo.com
authors.forename: P Abdul
authors.initials: PA
authors.lastname: Azeem
authors.forename: S
authors.initials: S
authors.lastname: Balaji
authors.forename: R R
authors.initials: RR
authors.lastname: Reddy
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D004419:Dysprosium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D049449:Luminescence; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D004419:Dysprosium; D000537:Aluminum Oxide