| abstract |
The present invention relates to a compound having the formula M (L A ) x (L B ) y (L C ) z , wherein the ligand L A is And the ligand L B is And the ligand L C is ≪ / RTI > Formula M In (L A) x (L B) y (L C) z,, M is a metal having an atomic number of 40 is exceeded, and x is 1 or 2, y is 0, 1 or 2, z is 0, 1 or 2, x + y + z is the oxidation state of the metal M, A 1 to A 8 are carbon or nitrogen, the ring B is bonded to the ring A through a CC bond, Wherein X is selected from the group consisting of O, S, Se, CRR 'and NR 1 , rings C and D are each independently a 5 or 6 membered carbocyclic or heterocyclic ring, R 3 represents a single substituted or double substituted or unsubstituted, R 2 , R C and R D each independently represents a single substitution, a double substitution, a triple substitution or a quadruply substituted or an unsubstituted, R 4 represents a single substitution , disubstituted, tri-substituted, or represents a fourfold substituted, at least one R 4 is a 5-or 6-membered heterocyclic ring which may be further substituted with R E, R E represents a single Substituted, di- substituted, tri-substituted, or represents a fourfold substituted, or unsubstituted, and each R substituent is selected from a variety of moieties, each independently, any of the R substituents adjacent are optionally combined to form a ring. |