Doping methods for hole injection and transport layers
AssigneePlextronics, Inc.
InventorsVenkataramanan Seshadri, Neetu Chopra
Life of this patent
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Abstract
A method including combining at least one first compound in a neutral form with at least one ionic dopant in a first solvent system to provide a first doped reaction product, isolating the first doped reaction product in solid form, and combining the isolated first doped reaction product with at least one conjugated polymer in neutral form in a second solvent system to form a second doped reaction product including an oxidized form of the conjugated polymer a neutral form of the first compound. Advantages include better stability, ease of use, and lower metal content. Applications include organic electronic devices including OLEDs.
Claims56
A method, comprising:
- providing at least one first compound which has a neutral form and an oxidized form, wherein the molecular weight of the first compound is less than 1,000 g/mole;
- providing at least one ionic dopant comprising a cation and an anion,
- combining the at least one first compound in a neutral form with the at least one ionic dopant comprising at least one cation and at least one anion in a first solvent system to provide a first doped reaction product, wherein the combination produces a neutral form of the cation, and wherein the first doped reaction product comprises an oxidized form of the first compound and the anion;
- isolating the first doped reaction product in solid form, including removing the neutral form of the cation from the first doped reaction product;
- providing at least one conjugated polymer which has a neutral form and an oxidized form,
- combining isolated first doped reaction product with the at least one conjugated polymer in neutral form in a second solvent system to form a second doped reaction product comprising an oxidized form of the conjugated polymer and the anion;
- wherein doping produces a neutral form of the first compound.
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A method, comprising:
- providing a first doped reaction product comprising an oxidized form of a first compound and an anion;
- providing at least one conjugated polymer which has a neutral form and an oxidized form,
- combining the first doped reaction product with the at least one conjugated polymer in neutral form in a second solvent system to form a second doped reaction product comprising an oxidized form of the conjugated polymer and the anion;
- wherein doping produces a neutral form of the first compound.
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A method, comprising:
- providing at least one first compound which has a neutral form and an oxidized form,
- providing at least one ionic dopant comprising a cation and an anion,
- combining the at least one first compound in a neutral form with the at least one ionic dopant comprising at least one cation and at least one anion in a first solvent system to provide a first doped reaction product, wherein the combination produces a neutral form of the cation, and wherein the first doped reaction product comprises an oxidized form of the first compound and the anion;
- isolating the first doped reaction product in solid form, including removing the neutral form of the cation from the first doped reaction product;
- providing at least one conjugated polymer comprising a poly(alkoxythiophene) which has a neutral form and an oxidized form,
- combining the isolated first doped reaction product with the at least one conjugated polymer in neutral form in a second solvent system to form a second doped reaction product comprising an oxidized form of the conjugated polymer and the anion;
- wherein doping produces a neutral form of the first compound, and
- wherein a first work function of the first compound is more negative than the work function of the conjugated polymer.
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Dependencies are inferred from the claim text.