Method for processing devices including quantum dots and devices
View Patent ↗A method of processing quantum dots is disclosed. The method comprises applying energy to excite the quantum dots to emit light and placing the quantum dots under vacuum after excitation of the quantum dots. Also disclosed is a method of processing a component including quantum dots comprising applying energy to the component including quantum dots to excite the quantum dots to emit light; and placing the component including quantum dots under vacuum after excitation. A method for processing a device is further disclosed, the method comprising applying energy to the device to excite the quantum dots to emit light; and placing the device under vacuum after excitation of the quantum dots. A method for preparing a device is also disclosed. Quantum dots, component, and devices of the methods are also disclosed.
1. A method for preparing a device, the method comprising: fabricating a device structure including quantum dots disposed between two electrodes; applying energy to the device to excite the quantum dots to emit light; and placing the device structure under vacuum after excitation of the quantum dots.
2. A method in accordance with claim 1 wherein the excitation step is carried out in air.
3. A method in accordance with claim 1 wherein the excitation step is carried out in an inert atmosphere.
4. A method in accordance with claim 1 wherein the quantum dots are excited for at least 30 seconds.
5. A method in accordance with claim 1 wherein the device is placed under vacuum for at least 30 minutes.
6. A method in accordance with claim 1 wherein the device is placed under a vacuum of at least 10 torr.
7. A method in accordance with claim 1 further including repeating a sequence of steps including the step of applying energy and the vacuum step one or more times.
8. A method in accordance with claim 1 further comprising encapsulating the device after the vacuum step.
9. A method in accordance with claim 8 wherein the device is encapsulated in the absence of oxygen.
10. A method in accordance with claim 1 wherein the quantum dots included in the device are not excited to emit light during the vacuum step.
11. A method in accordance with claim 1 wherein the method further comprises further processing of the device after the vacuum step in the absence of oxygen.
12. A method in accordance with claim 1 wherein the device further includes a first charge transport layer.
13. A method in accordance with claim 1 wherein the device further includes a second charge transport layer.
14. A method in accordance with claim 12 wherein the first charge transport layer comprises an inorganic semiconductor material.
15. A method in accordance with claim 13 wherein the second charge transport layer comprises an organic semiconductor material.
16. A method in accordance with claim 1 wherein the device is unencapsulated or less than fully encapsulated during the excitation and evacuation steps.
17. A method in accordance with claim 1 wherein fabricating the device comprises disposing quantum dots over a first electrode and exposing the quantum dots to small molecules prior to completing fabrication of the device structure.
18. A method in accordance with claim 1 wherein fabricating the device comprises disposing quantum dots over a first electrode and exposing the quantum dots to light flux in the presence of small molecules prior to completing fabrication of the device structure.
19. A device including quantum dots disposed between a pair of electrodes wherein the device is made by a method in accordance with claim 1 .
20. A method in accordance with claim 1 wherein the device comprises a light-emitting device.