Effect of substrate proximity on luminescence yield from Si nanocrystals

Llya Sychugov*, Augustinas Galeckas, Niklas Elfström, Andrew R. Wilkinson, Robert G. Elliman, Jan Linnros

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    The influence of the proximity of a high refractive index substrate on the luminescence of Si nanocrystals was investigated by time-integrated and time-resolved photoluminescence. The luminescence yield was found to be ∼2.5 times larger for emitters distanced from the substrate compared to those in proximity with the substrate, while luminescence decay measurements revealed only a slight increase in the luminescence lifetime (∼15%). Results are discussed in terms of local density of optical modes surrounding a pointlike light emitter with important implications for the collection efficiency of luminescence and the estimation of internal quantum efficiency for a quantum dot.

    Original languageEnglish
    Article number111124
    JournalApplied Physics Letters
    Issue number11
    Publication statusPublished - 2006


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