posted on 2021-08-12, 12:03authored byAnna Synak, Leszek Kułak, Piotr Bojarski, Agnieszka Schlichtholz
The model of Förster
excitation
energy transfer on a spherical core–shell nanoparticle was
presented. A general expression for fluorescence intensity decay was
obtained for an arbitrary number of acceptors linked chemically to
the shell. It was found that the dynamical behavior of the system
is extremely sensitive to the number of acceptors and the size of
the nanoparticle. Monte Carlo simulations performed for the energy
transfer parameters taken from an independent experiment show excellent
agreement with the model for donor fluorescence decay and its mean
lifetime. The original model was then extended to the common experimental
case of core–shell nanoparticle size distribution, assuming
the Gaussian distribution function of their radii. This effect leads
to slower fluorescence decays and longer mean fluorescence lifetimes,
as revealed by Monte Carlo simulations.