A support for chromophore elements, which elements are for being illuminated by excitation light to emit fluorescence at a wavelength different from that of the excitation light, the support including an internal reflective layer reflecting the light emitted by the chromophore elements, a layer of absorbent material absorbing the excitation wavelength, and a layer of material constituting an antireflection layer at said wavelength in order to avoid excitation light being reflected by the support and being added to the fluorescence emitted by the chromophore elements.