Photoluminescence in undoped (CdO)1−x-(InO3/2)x thin films at room temperature, 0≤x≤1

► The films are not constituted of a continuous solid solution, Cd(1−x)InxO(1+x/2). ► Three PL emission bands are observed: PL-B (2.9 eV), PL-A (2.3 eV), and PL-D (1.7 eV). ► Electronic transitions at RT for the generation of PL-B band are proposed.