  As grown ZnO:Si nanocomposite films fabricated by thermal evaporation showed
broad photoluiminescence (PL) spectra due to merging of four prominent peaks
viz 370, 410, 470 and 520 nm. Investigations revealed the role of interface in
contributing to the two blue peaks at 410 and 470 nm. While the 470 nm is found
to vary with ZnO grain size and their density, the 410 nm peak is attributed to
the volume of shell surrounding ZnO nanoparticles. This study shows the
contribution of ZnO cluster size and their density, as influenced by film
thickness, in the PL spectra of the samples.
