Multicolor-emitting, for example organic light emitter layers (1, 2, 3), the emission spectra of which can be mixed to form white light, are arranged laterally next to one another on a first transparent electrode layer (7). The light emitter layers (1, 2, 3) are preferably in strip form and have, for the purpose of simplifying production, macroscopic dimensions that can be resolved by the eye. The thickness of the light-scattering substrate (4) is therefore chosen such that the radiation beams emitted by the light emitter layers (1, 2, 3) are at least partly superposed on the light exit surface of the substrate (4), thereby giving rise to the optical impression of a white light source. (FIG. 1 for publication with the abstract)