| abstract |
A compound of the formula ML A L B where ligand L A is of Formula I, and ligand L B is of Formula II below. n n n n n n n n n n n n M is selected from Os(II) or Ru(II), and the compound ML A L B has a formal neutral charge; and rings A, B, C, D, E, and F are independently a 5-membered or 6-membered aromatic ring, and R A , R B , R C , R D , R E ,and R F each independently represent mono to the maximum allowable substitution, or no substitution. n L 1 , L 2 , L 3 , and L 4 independently represent a single bond or an organic linking group; n W 1 , W 2 , W 3 , and W 4 are independently selected from carbon or nitrogen; n Y 1 , Y 2 , Y 3 , and Y 4 are independently selected from carbon or nitrogen; and n Z 1 , Z 2 , and Z 3 are independently selected from carbon or nitrogen, and at least one of Z 1 , Z 2 , and Z 3 is nitrogen. An organic electroluminescent device that includes an anode, a cathode, and an organic layer comprising a compound of the formula ML A L B where ligand L A is of Formula I, and ligand L B is of Formula II above. A consumer product comprising an organic light-emitting device (OLED) above. |