Diffusion of 5p-holes in $\mathrm{BaF_2}$ nanoparticles

Abstract

The kinetic parameters of core-valence luminescence for BaF$_2$ nanoparticles with different sizes were studied under synchrotron radiation excitation with photon energy of 18.8 eV at room temperature. In contrast to BaF$_2$ single crystals the decay kinetics of nanoparticles is shown to be non-exponential indicating the luminescence quenching. We assume that the quenching of core-valence luminescence is caused by the diffusion of core holes to nanoparticle surface. The diffusion length of the core holes in BaF$_2$ has been estimated as 2–3 nm using diffusion model of luminescence quenching in nanoparticles