DEPENDENCE OF CATHODOLUMINESCENCE ON IRRADIATION TIME IN DIAMOND

Time dependent cathodoluminescence (CL) measurements were performed on natural diamond as well as both undoped and boron-doped CVD diamond f ilms in order to study the time dependence of the different CL bands. The 2.83 eV band, the so-called band A of diamond, was fitted well by a hyperbola in all of the different samples. However, the 2.32 eV band in boron-doped films was found to exhibit a different time evolution than the 2.83 eV band in the same CVD diamond sample. The effect of te mperature on edge emission and bound exciton recombination has also be en studied by time dependent CL measurements. An explanation of the ex perimental results is given in terms of different luminescence mechani sms.