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Publication Detail
Luminescence from erbium-doped silicon nanocrystals in silica: excitation mechanisms
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Kenyon AJ, Chryssou CE, Pitt CW, Shimizu-Iwayama T, Hole DE, Sharma N, Humphreys CJ
  • Publication date:
    01/01/2002
  • Pagination:
    367, 374
  • Journal:
    Journal of Applied Physics
  • Volume:
    91
  • Issue:
    1
  • Status:
    Published
  • Print ISSN:
    0021-8979
  • Language:
    English
  • Keywords:
    Excitation, Luminescence, MECHANISM, mechanisms, SILICON
Abstract
We develop a model for the excitation of erbium ions in erbium-doped silicon nanocrystals via coupling from confined excitons generated within the silicon nanoclusters. The model provides a phenomenological picture of the exchange mechanism and allows us to evaluate an effective absorption cross section for erbium of up to 7.3310217 cm2: four orders of magnitude higher than in stoichiometric silica. We address the origin of the 1.6 eV emission band associated with the silicon nanoclusters and determine absorption cross sections and excitonic lifetimes for nanoclusters in silica which are of the order of 1.02310216 cm2 and 20–100 ms, respectively.
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Dept of Electronic & Electrical Eng
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