The design and synthesis of polymeric organic light-emitting diodes (OLEDs) has been a major research focus in academia and industry due to the potential stability, processability, and tunability of these materials in comparison to their inorganic counterparts. In particular, phosphorescent metal complexes are at the center of recent research emphases on OLEDs. We recently reported the covalent functionalization of iridium complexes onto poly(norbornene)s. We demonstrated that the poly(norbornene) backbone does not interfere with the photophysical properties of the iridium complexes studied. In the presentation, we will discuss the synthesis of random copolymers containing host moieties and various iridium complexes in the side-chains that emit in various regions of the visible spectrum. Furthermore, we will discuss their solution and solid-state photoluminescence properties and their solid-state electroluminescence properties. Finally, we will report some preliminary results on the incorporation of these copolymers as the emissive layers in OLED devices.