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1997 TurnbullPDF


Title:Broad excitation of rare earth dopants in chalcogenide glasses
Author(s):Turnbull, Douglas Alan
Director of Research:Bishop, Stephen G.
Department / Program:Physics
Subject(s):rare earth-doped chalcogenide glasses
Photoluminescence excitation (PLE)
rare earth dopants
Abstract:Photoluminescence characterization has discovered a novel broad band excitation effect in rare earth-doped chalcogenide glasses. Photoluminescence excitation (PLE) bands with a width of ~450 nm have been observed which efficiently excite a number of rare earth emission lines. This effect is attributed to the absorption of excitation light by the host glass with the subsequent transfer of energy to the rare earth dopants, mediated by defect states in the glass. Studies on the effect of changing the rare earth dopant, the host glass bandgap, the host glass composition, and the sample temperature have all been performed. From numerous similarities to the host glass PLE lineshape, fatiguing, temperature dependence, and the spectral range over which the effect occurs, the defect states in the glass responsible for the broad band PLE are idenitifed as being the same states which give rise to the host glass luminescence in chalcogenide glasses. The theoretical implications of this identification are explored.
Issue Date:1997
Genre:Dissertation / Thesis
Rights Information:© 1997 Douglas Alan Turnbull
Date Available in IDEALS:2012-04-26
Identifier in Online Catalog:4038107

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