Oxygen scavenging nanoparticles for air-processed quantum dot light emitting diodes

1. A light emitting device comprising:

a first electrode;

a second electrode;

an emissive layer between the first and second electrodes;

wherein the emissive layer comprises quantum dots and oxygen scavenging nanoparticles.

2. The light emitting device of claim 1 , wherein the oxygen scavenging nanoparticles comprise one or more iron based materials.

3. The light emitting device of claim 1 , wherein the oxygen scavenging nanoparticles comprise one or more organic polymer based materials.

4. The light emitting device of claim 1 , wherein the oxygen scavenging nanoparticles become passive after being oxidized, and do not interfere with normal operations of the light emitting device.

5. The light emitting device of claim 1 , further comprising an electron injection layer disposed between the first electrode and the emissive layer, wherein the first electrode is a negative electrode.

6. The light emitting device of claim 1 , further comprising a hole injection layer disposed between the second electrode and the emissive layer, wherein the second electrode is a positive electrode.

7. The light emitting device of claim 1 , further comprising an electron transport layer disposed between the first electrode and the emissive layer, wherein the first electrode is a negative electrode.

8. The light emitting device of claim 1 , further comprising a hole transport layer disposed between the second electrode and the emissive layer, wherein the second electrode is a positive electrode.

9. The light emitting device of claim 1 , wherein the oxygen scavenging nanoparticles are phase separated from the quantum dots in the emissive layer.

10. The light emitting device of claim 1 , wherein the oxygen scavenging nanoparticles and the quantum dots are randomly dispersed in the emissive layer.

11. The light emitting device of claim 1 , wherein the quantum dots and the oxygen scavenging nanoparticles are arranged in an electron transporting organic matrix in the emissive layer.

12. The light emitting device of claim 1 , wherein the quantum dots and the oxygen scavenging nanoparticles are arranged in a hole transporting organic matrix in the emissive layer.

13. The light emitting device of claim 1 , wherein:

the emissive layer further comprises one or more hole transporting molecules;

the quantum dots and the oxygen scavenging nanoparticles are cross-linked to one another and with at least one of the one or more hole transporting molecules.

14. The light emitting device of claim 1 , wherein:

the emissive layer further comprises one or more electron transporting molecules;

the quantum dots and the oxygen scavenging nanoparticles are cross-linked to one another and with at least one of the one or more electron transporting molecules.

15. A light emitting device comprising:

an anode electrode;

a cathode electrode;

an emissive layer in electrical contact with the anode electrode and cathode electrode;

wherein the emissive layer comprises quantum dots and oxygen scavenging nanoparticles configured to prevent the quantum dots from oxidation.

16. The light emitting device of claim 15 , wherein the oxygen scavenging nanoparticles comprise at least one of:

one or more iron based materials; and

one or more organic polymer based materials.

17. The light emitting device of claim 15 , wherein the quantum dots and the oxygen scavenging nanoparticles are arranged in a hole transporting organic matrix in the emissive layer.

18. The light emitting device of claim 15 , wherein the quantum dots and the oxygen scavenging nanoparticles are arranged in an electron transporting organic matrix in the emissive layer.

19. The light emitting device of claim 15 , wherein the oxygen scavenging nanoparticles are phase separated from the quantum dots in the emissive layer.

20. The light emitting device of claim 15 , wherein the oxygen scavenging nanoparticles and the quantum dots are randomly dispersed in the emissive layer.