Organic iridium compositions and their use in electronic devices
View Patent ↗The present invention provides compositions comprising at least one novel polymeric organic iridium compound which comprises at least one cyclometallated ligand and at least one ketopyrrole ligand. The polymeric organic iridium compositions of the present invention are referred to as Type (2) organic iridium compositions and are constituted such that at least one ligand of the novel organic iridium compound has a number average molecular weight of 2,000 grams per mole or greater (as measured by gel permeation chromatography). Type (2) organic iridium compositions are referred to herein as comprising “polymeric organic iridium complexes”. The novel organic iridium compositions are useful in optoelectronic electronic devices such as OLED devices and photovoltaic devices. In one aspect, the invention provides novel organic iridium compositions useful in the preparation of OLED devices exhibiting enhanced color properties and light output efficiencies.
1. A composition comprising a polymeric organic iridium complex of structure XV
wherein each of the ligands
is independently at each occurrence a cyclometallated ligand derived from a phenylisoquinoline or a styrylisoquinoline, wherein each ligand may be the same or different;
R 2 is independently at each occurrence a deuterium atom, a halogen, a nitro group, an amino group, a C 3 -C 40 aromatic radical, a C 1 -C 50 aliphatic radical, or a C 3 -C 40 cycloaliphatic radical; and
“a” is an integer from 0 to 3;
and wherein the substructure
is a polymer chain comprising a benzene ring, wherein the benzene ring is attached to the CO group of the complex.
2. The composition according to claim 1 , wherein said polymer chain is selected from the group consisting of polycarbonates, polyarylates, polyacrylates, and polyamides.
3. The composition according to claim 1 , wherein said polymer chain is an electroactive polymer.
4. The composition according to claim 3 , wherein said electroactive polymer is an electroluminescent polymer.
5. The composition according to claim 4 , wherein said electroluminescent polymer is a polyfluorene.
6. The composition according to claim 1 , wherein at least one of the cyclometallated ligand and ketopyrrole ligand is at least 10 percent deuterated.
7. The composition according to claim 1 , wherein at least one of the cyclometallated ligand and ketopyrrole ligand is at least 50 percent deuterated.