Efficient Electroluminescent Devices Based on a Chelated Osmium(II) Complex

Red light from osmium complexes has been shown to occur with a peak radiance that exceeded 6000 cd m–2 at only 6 V. External quantum efficiencies that are of the order of 1 % have been achieved. The importance of ionic space charge effects in the mechanism of device operation is discussed here. The Figure shows the structure of the osmium complex.