Infrared luminescence in silicon carbide

The observation is reported of four infrared luminescence spectra in 6H SiC and two such spectra in 15R SiC. Two of the 6H spectra were already known from work of other investigators. It is shown that a relationship between these two spectra as proposed by these investigators does not exist. Attempts to identify impurities responsible for the luminescence by investigating the effect of the addition of particular impurities during crystal growth were not successful.