Hidden organic optoelectronic devices

An optoelectronic device comprising:

• a first and a second optoelectronic active region, each region comprising at least a rear electrode and a front electrode between which an organic optoelectronic material is sandwiched, said rear electrode being reflective, wherein the first and second optoelectronic active regions are arranged side by side and are mutually spaced apart so as to form an interstitial region between them;
• and
• a cover layer arranged in front of and superimposed on said front electrode of the first and second optoelectronic active regions, said cover layer comprising a material that comprises light-scattering particles of a first material dispersed in a transparent matrix comprised of an at least partly hydrolyzed silica sol, wherein said cover layer covers at least the combined surface of said first and second optoelectronic active regions and said interstitial region.