Abstract An assay was introduced to clarify influences on electroluminescent behavior for RGB-colored phosphorescent terpolymers with N, N-Di-p-tolyl-aniline as hole-transporting unit, 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1, 3, 4-oxadiazole (tert-BuPBD) as electron- transporting unit, and different iridium complexes in RGB-colors as triplet emitting materials. All monomers were attached with spacer moieties to the “para” position of a polystyrene. ...