The main objective of Lefko-Phoς is the development of photoactive materials emitting white light with high efficiency and high thermal, photochemical and electrochemical stability. Such materials are designed to be used in white-emitting OLEDs (WOLEDs).Current WOLED technology (for lighting or displays) requires the use of multiple luminophores in a single device by using (i) three different red-green-blue emitters or (ii) two-colour combination of blue-orange emissive materials. However, these strategies often do not work properly, because the final materials delivered imbalanced white-light emission, low efficiency and colour instability, due to the different stability over time of every single emitter. Moreover, the manufacturing process of WOLEDs becomes more complicated due to the incorporation of multiple emissive layers or a single emissive layer with multiple dopants.Lefko-Phoς attempts to generate white-light emission from a single-component material to overcome these drawbacks. The target emitters are binuclear cyclometalated iridium(III) complexes, whose emitting units are linked by a non-conjugated bridging ligand.