Abstract
Origin of the photoluminescence and band-edge electronic structure of pristine C 60 single crystals have been studied in the temperature range from 4 to 300 K by applying several spectroscopic techniques such as absorption, photoluminescence under one-photon and two-photon excitation, and site-selective luminescence line narrowing spectroscopy. Photo-absorption characterized by the prominent vibrational structures is found around 1.688 eV below the fundamental absorption edge (1.814 eV), which apparently exhibits mirror images of the well-known spectrum of photoluminescence called type A. Upon selective excitation into the band, luminescence line narrowing is observed: The spectra consists of sharp vibrational lines attributed to the progressions of eight H g and two A g modes and libron sidebands. These results indicate that type A luminescence originates from the inhomogeneously broadened localized state which may be stabilized by symmetry lowering and local rotational disorder spread over more than one molecule.
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