Organic electroluminescent device comprising two-dimensional emissive layer

Patent metadata

Field	Value
Publication number	US-12052918-B2
Application number	US-202117357485-A
Country	US
Kind code	B2
Filing date	Jun 24, 2021
Priority date	Jun 24, 2020
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

An organic light emitting device comprises an anode and a cathode, at least one organic layer configured between the anode and the cathode, and at least one two-dimensional emissive layer configured between the anode and the cathode. A method of fabricating an organic light emitting device is also disclosed.

First claim

What is claimed is:

1. An organic light emitting device comprising:
an anode and a cathode;
at least one organic charge transport layer positioned between the anode and the cathode;
an organic host layer positioned between the anode and the cathode; and
at least one two-dimensional emissive layer positioned at a distance of less than 10 nm from a position with the highest density of excitons within the organic host layer.

2. The organic light emitting device of claim 1 , wherein the two-dimensional emissive layer is selected from the group consisting of a transition metal dichalcogenide (TMD) active layer and a direct bandgap inorganic semiconductor.

3. The organic light emitting device of claim 2 , wherein the two-dimensional emissive layer comprises a material selected from Gallium Nitride, a group III-V direct bandgap semiconducting alloy or alloys, a group II-VI direct bandgap semiconducting alloy or alloys, or at least one monolayer of WS 2 .

4. The organic light emitting device of claim 1 , wherein the at least one organic charge transport layer comprises first and second organic buffer layers, and the at least one two-dimensional emissive layer is embedded between the first and second organic buffer layers.

5. The organic light emitting device of claim 4 , wherein the first organic buffer layer is a hole-transporting layer configured between the at least two-dimensional emissive layer and the anode.

6. The organic light emitting device of claim 5 , wherein the hole-transporting layer comprises 1,1-Bis[(di-4-tolylamino)phenyl]cyclohexane.

7. The organic light emitting device of claim 4 , wherein the second organic buffer layer is an electron transport layer configured between the cathode and the at least one two-dimensional emissive layer.

8. The organic light emitting device of claim 7 , wherein the electron transport layer comprises 4,6-Bis(3,5-di(pyridin-3-yl)phenyl)-2-methylpyrimidine or 4,6-Bis(3,5-di-3-pyridinylphenyl)-2-methylpyrimidine.

9. The organic light emitting device of claim 1 , wherein the organic host layer comprises 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl.

10. A method of fabricating the organic light emitting device of claim 1 comprising the step of:
depositing the two-dimensional emissive layer using chemical-vapor-deposition.

11. A consumer product comprising the organic light emitting device of claim 1 , the consumer product selected from a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall comprising multiple displays tiled together, a theater or stadium screen, a light therapy device, and a sign.

12. An organic light emitting device comprising:
an anode and a cathode;
at least one organic charge transport layer positioned between the anode and the cathode;
an organic host layer positioned between the anode and the cathode; and
at least two two-dimensional emissive layers positioned within the organic host layer.

13. A consumer product comprising the organic light emitting device of claim 12 , the consumer product selected from a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall comprising multiple displays tiled together, a theater or stadium screen, a light therapy device, and a sign.

14. An organic light emitting device, comprising:
a substrate;
a first electrode disposed over the substrate;
at least one organic layer disposed over the first electrode;
a first portion of an organic host layer disposed over the at least one organic layer;
at least one two-dimensional emissive layer disposed over the first portion of the organic host layer;
a second portion of the organic host layer disposed over the at least one two-dimensional emissive layer;
at least one second organic layer disposed over the second portion of the organic host layer; and
a second electrode disposed over the at least one two-dimensional emissive layer
wherein the at least one two-dimensional emissive layer is a monolayer; and
wherein the at least one two-dimensional emissive layer is positioned at a distance of less than 20 nm from a position with the highest density of excitons within the first and second portions of the organic host layer.

15. The organic light emitting device of claim 14 , wherein the two-dimensional emissive layer is selected from a transition metal dichalcogenide (TMD) active layer or an emissive direct bandgap inorganic semiconductor.

16. The organic light emitting device of claim 15 , wherein the TMD active layer is at least one monolayer of WS 2 .

17. The organic light emitting device of claim 14 , wherein the two-dimensional emissive layer comprises a material selected from at least one monolayer of WS 2 , Gallium Nitride, a group III-V direct bandgap semiconducting alloy or alloys, or a group II-VI direct bandgap semiconducting alloy or alloys.

18. The organic light emitting device of claim 14 , wherein the first electrode is a transparent anode.

19. The organic light emitting device of claim 14 , wherein the at least one organic layer comprises a hole transport layer and the at least one second organic layer comprises an electron transport layer.

20. A consumer product comprising the organic light emitting device of claim 14 , the consumer product selected from a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination and/or signaling, a heads-up display, a fully or partially transparent display, a flexible display, a laser printer, a telephone, a cell phone, tablet, a phablet, a personal digital assistant (PDA), a wearable device, a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display that is less than 2 inches diagonal, a 3-D display, a virtual reality or augmented reality display, a vehicle, a video wall comprising multiple displays tiled together, a theater or stadium screen, a light therapy device, and a sign.

Assignees

• Univ Michigan Regents

Inventors

• Forrest Stephen R
• Kim Jongchan
• Zhang Siwei

Classifications

• H10K50/16

  Electron transporting layers · CPC title

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title

• H10K85/6576

  comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene · CPC title

• H10K85/6574

  comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes · CPC title