Metal complexes, comprising carbene ligands having an o-substituted non-cyclometalated aryl group and their use in organic light emitting diodes

A cyclometallated Ir complex of formula (I)

• wherein
• A1 is CH or N;
• A2 is CR1 or N;
• A3 is CR2 or N;
• wherein in the case that A1 and/or A3 are N, A2 is CR1;
• R1, R2, R3, R4, R6 and R7
• are each independently hydrogen;
• deuterium;
• a linear or branched, substituted or unsubstituted alkyl radical having from 1 to 20 carbon atoms, optionally interrupted by at least one heteroatom, selected from O, S and N;
• a substituted or unsubstituted cycloalkyl radical having a total of from 3 to 30 carbon atoms;
• a substituted or unsubstituted heterocyclo alkyl radical, interrupted by at least one heteroatom selected from O, S and N and having a total of from 3 to 30 carbon atoms and/or heteroatoms;
• a substituted or unsubstituted aryl radical, having a total of from 6 to 30 carbon atoms;
• a substituted or unsubstituted heteroaryl radical, having a total of from 5 to 30 carbon atoms and/or heteroatoms, selected from O, S and N;
• or a group with donor or acceptor action;
• or
• R1 and R2, R3 and R4 and/or R6 and R7 may form, independently of each other, together with the carbon atoms to which they are bonded, a saturated or unsaturated or aromatic, optionally substituted ring, which is optionally interrupted by at least one heteroatom, selected from O, S and N, has a total of from 5 to 18 carbon atoms and/or heteroatoms, and may optionally be fused to at least one further optionally substituted saturated or unsaturated or aromatic ring, optionally interrupted by at least one heteroatom, selected from O, S and N, and having a total of from 5 to 18 carbon atoms and/or heteroatoms;
• R5
• is a linear or branched, substituted or unsubstituted alkyl radical having from 1 to 20 carbon atoms, optionally interrupted by at least one heteroatom, selected from O, S and N;
• a substituted or unsubstituted cycloalkyl radical having a total of from 3 to 30 carbon atoms;
• a substituted or unsubstituted heterocyclo alkyl radical, interrupted by at least one heteroatom selected from O, S and N and having a total of from 3 to 30 carbon atoms and/or heteroatoms;
• a substituted or unsubstituted aryl radical, having a total of from 6 to 30 carbon atoms;
• a substituted or unsubstituted heteroaryl radical, having a total of from 5 to 30 carbon atoms and/or heteroatoms, selected from O, S and N;
• or a group with donor or acceptor action;
• X is CH, CD or N;
• Y is CR8 or N;
• R8
• is hydrogen;
• deuterium;
• a linear or branched, substituted or unsubstituted alkyl radical having from 1 to 20 carbon atoms, optionally interrupted by at least one heteroatom, selected from O, S and N;
• a substituted or unsubstituted cycloalkyl radical having a total of from 3 to 30 carbon atoms;
• a substituted or unsubstituted heterocyclo alkyl radical, interrupted by at least one heteroatom selected from O, S and N and having a total of from 3 to 30 carbon atoms and/or heteroatoms;
• a substituted or unsubstituted aryl radical, having a total of from 6 to 30 carbon atoms;
• a substituted or unsubstituted heteroaryl radical, having a total of from 5 to 30 carbon atoms and/or heteroatoms, selected from O, S and N;
• or a group with donor or acceptor action.