Electronic devices comprising organic iridium compositions
View Patent ↗The present invention provides electronic devices comprising novel polymeric organic iridium compositions which provide for enhanced device performance. The polymeric organic iridium compositions employed comprise a polymeric organic iridium compound comprising at least one cyclometallated ligand and at least one ketopyrrole ligand. The polymeric organic iridium compositions employed are referred to as Type (2) organic iridium compositions and are constituted such that at least one ligand of the polymeric 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”. In one aspect, the present invention provides optoelectronic devices, such as OLED devices and photovoltaic devices. In another aspect, the invention provides OLED devices exhibiting enhanced color properties and light output efficiencies.
1. An organic light emitting device comprising:
a cathode;
an anode;
an electroluminescent material; and
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 organic light emitting device according to claim 1 , wherein said polymer chain is selected from the group consisting of polycarbonates, polyarylates, polyacrylates, and polyamides.
3. The organic light emitting device according to claim 1 , wherein said polymer chain is an electroactive polymer.
4. The organic light emitting device according to claim 3 , wherein said electroactive polymer is an electroluminescent polymer.
5. The organic light emitting device according to claim 4 , wherein said electroluminescent polymer is a polyfluorene.
6. An organic light emitting device comprising:
a cathode;
an anode; and
a light emitting polymer composition,
said light emitting polymer 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 rind is attached to the CO group of the complex.
7. An organic light emitting device comprising:
a cathode;
an anode;
an electroluminescent material; and
a polymeric organic iridium complex,
said polymeric organic iridium complex comprising structural units A and B
each of the substructures
is a polymer chain .