Broad excitation of rare earth dopants in chalcogenide glasses
Turnbull, Douglas Alan
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https://hdl.handle.net/2142/30768
Description
Title
Broad excitation of rare earth dopants in chalcogenide glasses
Author(s)
Turnbull, Douglas Alan
Issue Date
1997
Director of Research (if dissertation) or Advisor (if thesis)
Bishop, Stephen G.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
rare earth-doped chalcogenide glasses
Photoluminescence excitation (PLE)
rare earth dopants
luminescence
Language
en
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.
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