| abstract |
The metal complexes of formula (I) or (I ′) of the present invention exhibit excellent luminous efficiency in electroluminescent applications.n n n <Formula I>n n n n n n n n <Formula I '>n n n n n n n n Wherein n is an integer of 1 or 2, m and p are integers of 1 or 2, respectively, the sum (n + m) is 2 or 3, M is a metal having an atomic weight greater than 40, such as iridium, and L Is a ligand as described in claim 1, LDH is a bidentate ligand of Formula II,n n n <Formula II>n n n n n n n n LTH is a dimer of LDH bonded to two metal atoms M of formula II ',n n n <Formula II '>n n n n n n n n W is selected from O, S, NR 4 , CR 5 R 6 , X is N or CR 7 , Y is selected from O, S, NR 8 and further residues are as defined in claim 1.n n n Electroluminescent Metal Complex, Organic Light Emitting Diodes |