Zn$_{(1-x)}$Cd$_x$O solid solutions with a composition ranging from pure ZnO up to $x$ = 0.07 have been grown on ZnO substrates by using metalorganic chemical vapor deposition (MO-CVD). The alloy concentration was carefully measured using a Castaing electron microprobe. The measured lateral homogeneity of the alloy was around 0.1 \%. Two different photoluminescence lines were observed on Zn$_{(1-x)}$Cd$_x$O alloys. At low temperature, a localized exciton line was identified and a second line appeared at higher energy for intermediate temperatures. This effect is interpreted as a delocalization effect of excitons trapped in potential fluctuations related to a local alloy disorder.

Keywords: ZnO, ZnCdO, Alloys, MO-CVD, Photoluminescence, Exciton, Localization