TY - JOUR
T1 - Size-dependent intrinsic radiative decay rates of silicon nanocrystals at large confinement energies
AU - Sykora, Milan
AU - Mangolini, Lorenzo
AU - Schaller, Richard D.
AU - Kortshagen, Uwe
AU - Jurbergs, David
AU - Klimov, Victor I.
PY - 2008/2/14
Y1 - 2008/2/14
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.100.067401
DO - 10.1103/PhysRevLett.100.067401
M3 - Article
C2 - 18352513
AN - SCOPUS:40849098188
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 6
M1 - 067401
ER -