An integrated optoelectronic device (100, 200, 300) comprises a substrate (30) which supports a passive waveguide (31) for index-confining, in two transverse directions, and guiding, along a longitudinal direction, at least one optical mode. The devices further includes a first charge transport layer (11) for transporting charge carriers of a first conductivity type, a second charge transport layer (12) for transporting charge carriers of a second conductivity type, opposite to the first conductivity type, and an active layer (20) comprising a particulate film of solution- processable ...