Exciton Dynamics within an Inhomogeneously Broadened Line

Abstract

Exciton dynamics in Tb${\mathrm{}\left(\mathrm{OH}\right)\mathrm{}}_3$ is shown to depend upon the excitation location within the $k\simeq 0$ inhomoheneously broadened absorption profile. The dynamics is observed by monitoring the populations of the different $k$ states from time-resolved band-to-band luminescence. The results indicate the presence of experimentally separable microscopic regions within which delocalized exciton states occur with well-defined $k$ values.