  We investigated the electroluminescent properties of the epitaxial
graphene/SiC junction. The temperature and current dependence of
electroluminescence from the epitaxial graphene/SiC is measured within a
temperature range of 50-300 K. The result of electroluminescence at 300~K is
compared with the electroluminescent spectra from aluminium/SiC junction. The
difference between the spectra is explained by the different band bending,
which could lead to the tunable LED due to the semi-metal character of the
graphene. We observed the electroluminescence at both bias polarities and we
described the blue shift in the spectra by Franz-Keldysh effect.
