LUMINESCENCE IN NANOSTRUCTURED MATERIALS

Some new photoluminescence phenomena, which have not been observed for conventional coarse grain materials, are reported for nanostructured materials, such as nanostructured eta, gamma - Al2O3, boehmite, TiO2 ( anatase), and amorphous silicon nitride. In this article we discussed the mechanisms of these new luminescence phenomena appearing in nanost ructured materials in terms of quantum confinement effect, impurity an d defect energy levels in the energy gap and destruction of selection rules of electronic transitions.