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Optical Properties of Rare‐Earth Ions in Lead Germanate Glasses
Author(s) -
Wachtler Mario,
Speghini Adolfo,
Gatterer Karl,
Fritzer Harald P.,
Ajò David,
Bettinelli Marco
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02586.x
Subject(s) - germanate , ion , analytical chemistry (journal) , emission spectrum , radiative transfer , chemistry , quenching (fluorescence) , dopant , lead oxide , absorption (acoustics) , materials science , fluorescence , spectral line , doping , optics , physics , optoelectronics , organic chemistry , chromatography , astronomy , composite material
Glasses of composition ( x ‐ 1)PbO(100 ‐ x )GeO 2 1Ln 2 O 3 , with x = 30 mol% (Ln = Nd, Eu, Er), 40 mol% (Ln = Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm), and 50 mol% (Ln = Eu, Er), have been prepared by quenching the oxidic melts. From the optical absorption and emission spectra in the ultraviolet‐visible‐near‐infrared (UV‐VIS‐NIR) region, the intensity parameters, spontaneous emission probabilities, branching ratios, radiative lifetimes, and, for selected NIR transitions, peak stimulated emission cross sections have been obtained. The trends observed in the intensity parameters have been discussed, as a function of the number of f electrons as well as a function of the lead content. As the amount of lead increases, the covalency of the Ln‐O bond increases, the symmetry of the rare‐earth site increases, and the dopant site distribution narrows. The peak stimulated emission cross sections rank among the highest found for oxide glasses.