Nanocomposite thin films containing finely dispersed, crystalline In2O3 nanoparticles embedded in SiO2 matrix were fabricated by target-attachment sputtering method. Transmission electron microscopy observed single crystalline In2O3 nanoparticles uniformly embedded in SiO2 matrix of the samples with In2O3 content less than about 60vol.%. Photoluminescence spectra of the In2O3-SiO2 nanocomposite samples were found to comprise of the blue, green and red emissions. Analytical results indicated that the red and green emissions are correlated to the transitions from conduction band (CB) edge to the Ini••• and V‴In defect levels, respectively, while the blue emission is originated from the transition from CB edge to VO•• level or from VO• level to the valence band edge.
- Emission mechanisms