| abstract |
A compound having the structure of the formula M (L A ) x (L B ) y (L C ) z , wherein the ligand L A is ego; The ligand L B is ego; The ligand L C Phosphorus compounds are disclosed. In the formula M (L A ) x (L B ) y (L C ) z , M is a metal having a valence of more than 40; x is 1, 2 or 3; y and z are 0, 1 or 2; x + y + z is the oxidation state of the metal M; Z 1 -Z 6 are each C or N; Z D is N or carbene carbon; Rings C and D are independently a 5 or 6 membered carbocyclic or heterocyclic ring; R 4 is substituted and each of R 1 , R 2 , R 3 , R C , R D , R 11 , R 12 and R 13 is selected from hydrogen and various moieties; Any adjacent substituents of R 1 , R 2 , R 3 , R 4 , R C , R D , R 11 , R 12 and R 13 are optionally joined to form a ring. Preparations comprising compounds of the formula M (L A ) x (L B ) y (L C ) z , and devices such as OLEDs are also described. |