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US 2019/0169452 A1Published application
Ester-Based Solvent Systems for Printable Organic Light-Emitting Diode Ink Formulations
AssigneeKateeva, Inc.
InventorsInna Tregub, Tane Boghozian, Michelle Chan
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Abstract
Ink compositions for forming active layers in an organic light-emitting diode are provided. Also provided are methods of forming active layers of an OLED using the ink compositions. The ink compositions comprise a solvent system in which a substantial majority of the solvent is comprised of one or more ester compounds.
Claims14
A method of forming a hole transporting layer, a hole injection layer, or a light-emitting layer for an organic light-emitting diode, the method comprising:
- inkjet printing a layer of an ink composition in a pixel cell of an organic light-emitting diode pixel bank, the ink composition comprising a first component selected from a hole transporting material comprising a crosslinkable polymer, a conductive hole injection material;
- and an organic electroluminescent material, wherein the first component is dissolved in a solvent system, the solvent system comprising at least one ester, and further wherein the ink composition comprises from 0.1 to 5 weight percent of the first component and has a viscosity of 100 cPs or lower at 23° C.;
- and
- drying the layer of the ink composition under vacuum.
1 more element
A method of forming a hole transporting layer and a light-emitting layer for an organic light-emitting diode, the method comprising:
- inkjet printing a layer of a first ink composition in a pixel cell of an organic light-emitting diode pixel bank, the first ink composition comprising a hole transporting material comprising a crosslinkable polymer, wherein the hole transporting material is dissolved in a solvent system, the solvent system comprising at least one ester, wherein the first ink composition comprises from 0.1 to 5 weight percent of the hole transporting material and has a viscosity of 100 cPs or lower at 23° C.;
- drying the layer of the first ink composition under vacuum;
- inkjet printing a layer of a second ink composition in the pixel cell, the second ink composition comprising an organic electroluminescent material dissolved in a second solvent system, the second solvent system comprising least one ester, wherein the second ink composition comprises from 0.1 to 5 weight percent of the organic electroluminescent material and has a viscosity of 100 cPs or lower at 23° C.;
- and
- drying the layer of the second ink composition under vacuum.
2 more elements
Dependencies are inferred from the claim text.