Hole injection/transport layer compositions and devices
AssigneePlextronics, Inc.
InventorsTroy D. Hammond, Shawn P. Williams, Elena Sheina, Darin W. Laird, Christopher Greco, Brian Woodworth
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Abstract
Compositions for use in HIL/HTL applications include intrinsically conductive polymer, planarizing agent, and dopant, which are soluble in non-aqueous solvents. Block copolymers of regioregular alkyl/alkoxy- and aryl-substituted polythiophenes can be used. The compositions can be formed into thin films. Excellent efficiency and lifetime stability can be achieved.
Claims33
A blend composition for use in a hole injection layer or hole transport layer comprising the following components:
- (i) at least one intrinsically conductive polymer or copolymer,
- (ii) at least one dopant for the conductive polymer or copolymer;
- and
- (iii) at least one planarizing agent, wherein the planarizing agent is a synthetic polymer;
- wherein the components are soluble in non-aqueous solvents and are formulated to form a compatible blend when the composition is in the form of a hole injection layer or hole transport layer less than about 200 nm thick, wherein the intrinsically conductive polymer or copolymer is a regioregular 3-substituted polythiophene.
An electroluminescent device comprising a hole injection layer or hole transport layer comprising the following components:
- (i) at least one intrinsically conductive polymer or copolymer soluble in non-aqueous solvent, and wherein the intrinsically conductive polymer or copolymer is a regioregular 3-substituted polythiophene,
- (ii) at least one dopant for the conductive polymer or copolymer;
- and
- (iii) at least one planarizing agent, wherein the planarizing agent is a synthetic polymer soluble in non-aqueous solvent;
- wherein the hole injection layer or hole transport layer is less than about 200 nm thick.
An electroluminescent device comprising a hole injection layer or hole transport layer comprising the following components:
- (i) at least one intrinsically conductive polymer or copolymer, wherein the intrinsically conductive polymer or copolymer is a regioregular 3-substituted polythiophene soluble in non-aqueous solvent;
- (ii) at least one dopant for the conductive polymer or copolymer;
- and
- (iii) at least one synthetic polymer soluble in non-aqueous solvent;
- wherein the hole injection layer or hole transport layer is less than about 200 nm thick.
An ink formulation for hole injection layer or hole transport layer application comprising:
- about 0.5 wt. % to about 25 wt. % soluble regioregular 3substituted polythiophene soluble in organic solvent,
- about 0.5 wt. % to about 70 wt. % organic polymer soluble in organic solvent, organic oxidant dopant, and
- organic solvent.
An ink formulation for hole injection layer or hole transport layer application comprising:
- about 0.5 wt. % to about 25 wt. % soluble regioregular 3substituted polythiophene soluble in organic solvent,
- about 0.5 wt. % to about 80 wt. % organic polymer soluble in organic solvent, organic oxidant dopant, and
- organic solvent.
Dependencies are inferred from the claim text.