title: Rare earths in lead-free oxyfluoride germanate glasses.
abstract: Spectroscopic properties of rare earths in lead-free oxyfluoride germanate glasses were studied. The absorption and luminescence spectra of Eu(3+), Pr(3+) and Er(3+) ions were examined as a function of BaF₂ concentration and several spectroscopic parameters for rare earths were determined. The ratio of integrated luminescence intensity of the (5)D₀→(7)F₂ transition to that of the (5)D₀→(7)F₁ transition of Eu(3+) decrease significantly with increasing BaF₂ content. The absorption (Er(3+)) and emission (Pr(3+)) 'hypersensitive transitions' of rare earths are shifted in direction to shorter wavelengths with increasing BaF₂ content in glass composition. Emission spectra and their decays corresponding to the main (4)I₁₃/₂→(4)I₁₅/₂ laser transition of Er(3+) were also analyzed. Quite long-lived NIR luminescence of Er(3+) is observed for lead-free glass samples with low BaF₂ concentration.
authors.affiliation: Institute of Chemistry, University of Silesia, Szkolna 9, 40-007 Katowice, Poland. Electronic address: wojciech.pisarski@us.edu.pl.
authors.forename: Wojciech A
authors.initials: WA
authors.lastname: Pisarski
authors.affiliation: Institute of Chemistry, University of Silesia, Szkolna 9, 40-007 Katowice, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Pisarska
authors.affiliation: Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45D, 15-351 Bialystok, Poland.
authors.forename: Dominik
authors.initials: D
authors.lastname: Dorosz
authors.affiliation: Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45D, 15-351 Bialystok, Poland.
authors.forename: Jan
authors.initials: J
authors.lastname: Dorosz
mesh_terms: D005461:Fluorine / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D049449:Luminescence; D008674:Metals, Rare Earth / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*
chemical_list: D008674:Metals, Rare Earth; D010087:Oxides; D005857:Germanium; D005461:Fluorine; C014559:fluorine monoxide
keywords: Lead-free glasses; Luminescence; Rare earth ions; Spectroscopic properties