Light-emitting electrochemical cells based on ionic iridium (III) complexes

In recent years, light-emitting electrochemical cells (LECs) based on ionic transition metal complexes (iTMCs) with phosphorescent emission have attracted considerable interest because of their great potentials in display and lighting applications. Among all the iTMCs, ionic iridium(III) complexes are one of the best phosphorescent materials because of their advantageous emission properties, such as high luminescent efficiency and tunable emission colors. This review summarized the recent research progress of ionic iridium (III) complexes applied in light-emitting electrochemical cells, mainly focusing on the development of LECs with different light-emitting colors and the improvement of device performances. In addition, the future directions in this field are also discussed.