| abstract |
A light emitting device comprising an anode, a cathode, a light emissive layer located between the anode and the cathode, said light emissive layer comprising a compound for emitting light, said compound comprising a metal complex and X, said metal complex containing a metal (M) and a phosphorous atom that is coordinated directly to M, and an aryl or heteroaryl group Ar s that is directly bonded to the phosphorous atom, where Ar s is substituted with X, and characterized in the X comprises an aryl or heteroaryl group. |