| abstract |
A light emitting device comprising an anode, a cathode, a light emitting layer disposed between the anode and the cathode, The light emitting layer includes a light emitting compound, the light emitting compound includes a metal complex and X, and the metal complex includes a phosphorus atom directly coordinated to metals (M) and M, and an aryl directly bonded to the phosphorus atom. Alternatively, the light-emitting device includes a heteroaryl group Ar s , wherein Ar s is substituted with X, and X includes an aryl or heteroaryl group. [Selection] Figure 1 |