Reappraising the Luminescence Lifetime Distributions in Silicon Nanocrystals.

ABSTRACT: The luminescence dynamics in ensembles of nanocrystals are complicated by a variety of processes, including the size-dependence of the radiative and non-radiative rates in inhomogeneous broadened samples and interparticle interactions. This results in a non-exponential decay, which for the specific case of silicon nanocrystals (SiNCs) has been widely modeled with a Kohlrausch or "stretched exponential" (SE) function. We first derive the population decay function for a luminescence decay following exp[- (t/τ)^β]. We then compare the distributions and mean times calculated by assuming that either the luminescence decay or the population decay follows this function and show that the results are significantly different for β much below 1. We then apply these two types of SE functions

SUBMITTER: Jakob M 

PROVIDER: S-EPMC6261909 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature