Light emitting compounds
Claimed is a cyclometallated organometallic light emitting complex having two tridentate ligand portions sharing a central heterocycle “A” providing a binding-site for each of the two metals (formula I): Formula (I): A more illustrative embodiment is formula (XII): Characterizing for the invention is that either one of XI and X2 and either one of Y1 and Y2 is carbon. The dinuclear complexes are for use in OLEDs.
1. A cyclometallated organometallic light emitting complex having a first tridentate ligand portion coordinated with a first metal and a second tridentate ligand portion coordinated with a second metal, the complex having a structure according to Formula (IV):
wherein:
A is selected from the group consisting of pyrimidine, and wherein W 1 and W 2 are the nitrogen atoms of said pyrimidine ring;
wherein M 1 and M 2 are each iridium;
wherein G 1 and G 2 represent first and second aromatic moieties respectively and Z 3 is one or more bonds by which the first aromatic moiety G 1 is joined to the second aromatic moiety G 2 and
wherein G 3 and G 4 represent first and second aromatic moieties respectively and Z 6 is one or more bonds by which the first aromatic moiety G 3 is joined to the second aromatic moiety G 4 ;
wherein X 1 , X 2 and W 1 are coordinated to metal atom M 1 ;
wherein Y 1 , Y 2 and W 2 are coordinated to metal atom M 2 ;
wherein at least one of atoms X 1 and X 2 is connected to said metal atom M 1 via an organometallic bond and/or wherein at least one of atoms Y 1 and Y 2 is connected to said metal atom M 2 via an organometallic bond; wherein each of X 1 , X 2 , Y 1 and Y 2 is independently carbon or nitrogen;
Z 1 and Z 2 are one or more bonds;
T 1 and T 2 are auxiliary ligands in which m and n are 0 or an integer sufficient to satisfy the respective coordination requirements of M 1 and M 2 , and where m and n are 2 or more, each respective auxiliary ligand may be the same or different.
2. The complex according to claim 1 , wherein at least one of X 1 , X 2 , Y 1 and Y 2 is carbon.
3. The complex according to claim 1 , wherein at least one of X 1 and X 2 is carbon and at least one of Y 1 and Y 2 is carbon.
4. The complex according to claim 1 , wherein each of Y 1 and Y 2 is independently carbon or nitrogen.
5. The complex according to claim 1 , wherein one of Y 1 and Y 2 is nitrogen and the other is carbon.
6. The complex according to claim 1 , having the structure of general Formula (X):
wherein R 1 to R 14 are each independently selected from the group consisting of H and a substituent.
7. An organic light emitting diode (OLED) comprising or including a complex as claimed in claim 1 .