An Analysis of Electron-Hole Recombination in Solid Xenon with Time-Resolved Luminescence Spectroscopy

Prompt and delayed secondary excitons in rare gas solids

“…The values of the initial carrier densities are by far much lower than those estimated from the photon flux and from the value of the absorption coefficient at the respective photon energy of excitation [15] for the following reasons. The initial density is the density after redistribution of the carriers via Coulomb scattering.…”

“…The full curves in Figs. 4 and 5 are results of model calculations in which the carrier dynamics have been treated in the following way [15,16]. The starting point is an initial mean kinetic energy of the carriers, (the excess energy is shared among the carriers according to the effective masses m e , and m h ), and a density of electrons and holes, n n e h , , 0 0 = , which has been established due to the nearly d-like photo-excitation.…”

“…It is therefore obvious that recombination of electrons and holes into free excitons occurs. The decay curves, however, change dramatically as is shown for Kr [12] and Xe [15] in Figs. 4 and 5.…”

“…Here, a special aspect of rare gas solids comes into play: the simple fcc lattice of the rare gas solids allows only for acoustical phonons which slows down thermalization of carriers, compared to, e.g., alkali halides. It turns out that the bottleneck of recombination is the thermalization process because the recombination cross section is a sensitive function of the velocity of the carriers [15]. The curves in Figs.…”

“…The shape of the delayed FE luminescence was used to analyze the recombination dynamics of the photo carriers [15]. The full curves in Figs.…”