The study on mechanism of ultraviolet laser emission at room temperature from nanocrystal thin ZnO films grown on sapphire substrate by L-MBE

ZnO nanocrystal thin films were fabricated on sapphire substrates by laser molecular beam epitaxy. The structure and optical properties of the films were investigated experimentally. The film having small nanocrystal size of about 50–200 nm shows optically pumped ultraviolet laser emission at room temperature. This paper discussed the theoretical mechanism of excitonic radiative recombination in relation with the nanocrystal structure on ZnO film ultraviolet laser research. It is concluded that the experimental results are consistent with the theoretical analysis. [Copyright &y& Elsevier]