Universal Display Corporation
Organic electroluminescent materials and devices

Abstract:

A compound of the formula ML.sub.AL.sub.B where ligand L.sub.A is of Formula I, and ligand L.sub.B is of Formula II below. ##STR00001## M is selected from Os(II) or Ru(II), and the compound ML.sub.AL.sub.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.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E,and R.sup.F each independently represent mono to the maximum allowable substitution, or no substitution. L.sup.1, L.sup.2, L.sup.3, and L.sup.4 independently represent a single bond or an organic linking group; W.sup.1, W.sup.2, W.sup.3, and W.sup.4 are independently selected from carbon or nitrogen; Y.sup.1, Y.sup.2, Y.sup.3, and Y.sup.4 are independently selected from carbon or nitrogen; and Z.sup.1, Z.sup.2, and Z.sup.3 are independently selected from carbon or nitrogen, and at least one of Z.sup.1, Z.sup.2, and Z.sup.3 is nitrogen. An organic electroluminescent device that includes an anode, a cathode, and an organic layer comprising a compound of the formula ML.sub.AL.sub.B where ligand L.sub.A is of Formula I, and ligand L.sub.B is of Formula II above. A consumer product comprising an organic light-emitting device (OLED) above.