Patent ID: 8916853

Claim:
An organic light-emitting diode comprising at least one uncharged transition metal complexes of the formula (I) comprising at least one carbene ligand wherein the symbols have the following meanings: M 1 is Ir in any oxidation state possible for the respective metal atom; carbene is a carbene ligand which may be uncharged or monoanionic and monodentate, bidentate or tridentate, with the carbene ligand also being able to be a biscarbene or triscarbene ligand; L is a monoanionic or dianionic ligand, which may be monodentate or bidentate; n is the number of carbene ligands, wherein n is at least 1 and when n>1 the carbene ligands in the complex of the formula I can be identical or different; m is the number of ligands L, wherein m can be 0 or ≧1 and when m>1 the ligands L can be identical or different; o is the number of ligands K, wherein o is 0; wherein the sum n+m+o is dependent on the oxidation state and coordination number of the metal atom and on the denticity of the ligands carbene, L and also on the charge on the ligands carbene and L, with the proviso that n is at least 1, wherein the carbene ligand or ligands has/have the formula II wherein the symbols have the following meanings: Do 1 is N; r is 1; p is 0; q is 0; Y 1 and Y 2 together form a bridge between the donor atom Do 1 and the nitrogen atom N which has two atoms of which one is a carbon atom, and the other is a carbon or nitrogen atom; Y 3 is hydrogen or an alkyl, aryl, heteroaryl or alkenyl radical; or wherein Do 2′ , q′, s′, R 3′ , R 1′ , R 2′ , X′ and p′ are each, independently of one another, as defined for Do 2 , q, s, R 3 , R 1 , R 2 , X and p; R 1 and R 2 together form a bridge having a total of from three to five atoms of which one or two atoms may be heteroatoms and the remaining atoms are carbon atoms, so that the group forms a five- to seven-membered, ring which may contain, in addition to the existing double bond, one further double bond or in the case of a six- or seven-membered ring two further double bonds and may be substituted by alkyl or aryl groups and may contain at least one heteroatom.