Growth Surface dependence of Cathodoluminescence of Cubic Boron Nitride

摘要

We have investigated cathodoluminenscence of a type of commercially available cBN crystals. Four kinds of luminescence bands were seen in a given crystal. Three of them have been reported and named the O-center, the T-center and the UCL, but the other one, which has a broad peak around 350 nm, has not been doucmented. Clear growth surface dependence ofthe ans was seen: the O-center was present on nitrogen teminated{111}, the T-center and the undocumented broad band were on boron terminated {111} and the UCL was on {100}. The O-center and UCL were intensified with annealing at 1600 degree and 6 GPa.