Size-dependent intrinsic radiative decay rates of silicon nanocrystals at large confinement energies

Milan Sykora, Lorenzo Mangolini, Richard D. Schaller, Uwe Kortshagen, David Jurbergs, Victor I. Klimov

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We study ultrafast photoluminescence (PL) dynamics of Si nanocrystals (NCs). The early-time PL spectra (<1ns), which show strong dependence on NC size, are attributed to emission involving NC quantized states. The PL spectra recorded for long delays (>10ns) are almost independent of NC size and are likely due to surface-related recombination. Based on instantaneous PL intensities measured 2 ps after excitation, we determine intrinsic radiative rate constants for NCs of different sizes. These constants sharply increase for confinement energies greater than ∼1eV indicating a fast, exponential growth of the oscillator strength of zero-phonon, pseudodirect transitions.

Original languageEnglish
Article number067401
JournalPhysical review letters
Issue number6
Publication statusPublished - Feb 14 2008


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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