Heteroleptic transition metal-carbene complexes and their use in organic light-emitting diodes
The present invention relates to heteroleptic carbene complexes comprising at least two different carbene ligands, to a process for preparing the heteroleptic carbene complexes, to the use of the heteroleptic carbene complexes in organic light-emitting diodes, to organic light-emitting diodes comprising at least one inventive heteroleptic carbene complex, to a light-emitting layer comprising at least one inventive heteroleptic carbene complex, to organic light-emitting diodes comprising at least one inventive light-emitting layer, and to devices which comprise at least one inventive organic light-emitting diode.
1. A heteroleptic carbene complex of the general formula (I)
M 1 [carbene] n (I)
comprising at least two different carbene ligands,
wherein the symbols are each defined as follows:
M 1 is Ir(III)
n is 3
wherein the first of the at least two different carbene ligands has the general formula:
and the second of the at least two different carbene ligands has the general formula:
wherein Q is CF 3 or CN;
Y 3 is an alkyl group having 1, 2, or 3 carbon atoms; and
Ar 1 is a phenyl group.
2. The heteroleptic carbene complex of claim 1 , wherein the first of the at least two different carbene ligands has one of the following structures:
3. An organic light-emitting diode comprising at least one heteroleptic carbene complex according to according to claim 1 .
4. A device selected from the group consisting of stationary visual display units, and mobile visual display units comprising at least the organic light emitting diode according to claim 3 .
5. A light-emitting layer comprising at least one heteroleptic carbene complex according to according to claim 1 .
6. An organic light emitting diode comprising at least one light-emitting layer according to claim 5 .