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Proceedings Paper

Broad band excitation of rare earth emission in chalcogenide glasses
Author(s): Douglas A. Turnbull; Vessela M. Krasteva; George H. Sigel Jr.; Stephen G. Bishop
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Paper Abstract

Recent studies of photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopy in rare earth-doped chalcogenide glasses have discovered a novel broad excitation band for the rare earth emissions. This band is attributed to the absorption of light in the Urbach tail of the band edge absorption of the host glass, with a subsequent non-radiative transfer of the absorbed energy to the rare earth atoms. The present work provides new insight concerning the energy transfer mechanism through an investigation of the efficiency, peak energy, and lineshape of the board band excitation as a function of the bandgap energy of the host glass. The bandgap energy has been altered by changing the host glass composition, and by obtaining the PL and PLE spectra at temperatures ranging from 5K to 300K. In agreement with prediction, it is found that the spectral position of the broad PLE band tracks with the bandgap, shifting to higher energies as the bandgap is increased. It is also found, again agreeing with prediction, that in glasses with larger bandgaps the broad band PLE mechanism can excite higher lying transitions of the rare earth dopants.

Paper Details

Date Published: 2 May 1997
PDF: 5 pages
Proc. SPIE 2996, Rare-Earth-Doped Devices, (2 May 1997); doi: 10.1117/12.271164
Show Author Affiliations
Douglas A. Turnbull, Univ. of Illinois/Urbana-Champaign (United States)
Vessela M. Krasteva, Rutgers Univ. (United States)
George H. Sigel Jr., Rutgers Univ. (United States)
Stephen G. Bishop, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 2996:
Rare-Earth-Doped Devices
Seppo Honkanen, Editor(s)

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