It is indicated that the boron doping promotes the growth of (111) face of the diamonds, enhances acceptor level, narrow 's band gap and increases carrier concentration correspondingly.

The phenomenon of the blue range electroluminescence of the boron doped diamond thin films is reported, and the several light emission mechanisms on band A are summarized.

The results showed the absorption band produced by the imperfection, impurity and non diamond phase in films decreased the transmission of the films.