An organic light emitting device is provided. The device has an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer further comprising an emissive material having the structure: ##STR00001## M is a metal having an atomic weight greater than 40. R.sub.5 is an aromatic group. The emissive material itself is also provided. The emissive material provides an improved stability and efficiency.