Flexible electroluminescent devices
Embodiments of a flexible electroluminescent (EL) device are described. An EL device includes a device stack and a flexible substrate configured to support the device stack. The device stack can include a anode and a cathode, a quantum dot (QD) film positioned between the anode and the cathode and configured to produce light having a first peak wavelength. The device stack further includes a patterned insulating layer disposed on the anode and configured to form electrically active regions in the device stack and to control emission of the light from the EL device through the electrically active regions. The EL device further includes an encapsulation layer disposed on the cathode.
1. An electroluminescent (EL) device comprising:
a device stack comprising:
an anode and a cathode;
a quantum dot (QD) film positioned between the anode and the cathode and configured to produce light having a first peak wavelength, and
a patterned insulating layer disposed on the anode and configured to form electrically active regions in the device stack and to control emission of the light from the EL device through the electrically active regions;
a flexible substrate configured to support the device stack; and
an encapsulation layer disposed on the cathode.
2. The EL device of claim 1 , wherein the patterned insulating layer comprises patterned and unpatterned regions and wherein the patterned regions are configured to form the electrically active regions.
3. The EL device of claim 1 , wherein the patterned insulating layer is configured to emit the light through selective regions of the flexible substrate; and
wherein the selective regions correspond to patterned regions of the patterned insulating layer.
4. The EL device of claim 1 , wherein the QD film comprises a population of QDs configured to emit red, green, or blue light.
5. The EL device of claim 1 , wherein the encapsulation layer comprises a coupling layer and a barrier film; and
wherein the coupling layer includes a pressure sensitive adhesive layer and is configured to attach the barrier film to the cathode.
6. The EL device of claim 1 , further comprising a second encapsulation layer disposed on the flexible substrate.
7. The EL device of claim 6 , further comprising a color processing layer disposed on the second encapsulation layer and configured to filter or down convert the light to produce a processed light having a second peak wavelength different from the first peak wavelength.
8. The EL device of claim 1 , further comprising a color processing layer disposed on the flexible substrate and configured to filter or down convert the light to produce a processed light having a second peak wavelength different from the first peak wavelength.
9. The EL device of claim 8 , wherein the color processing layer comprises patterned and unpatterned regions;
wherein the patterned regions of the color processing layer are configured to filter or down convert the light to produce the processed light; and
wherein the patterned regions of the color processing layer are arranged in a pattern similar to patterned regions of the patterned insulating layer.
10. An electroluminescent (EL) device comprising:
a flexible substrate;
a device stack disposed on the flexible substrate, the device stack comprising:
an insulating layer disposed on the flexible substrate and patterned to form electrically active regions and to control emission of the light from the EL device through the electrically active regions; and
a quantum dot (QD) film disposed on the insulating layer and in the electrically active regions, and configured to produce light having a first peak wavelength; and
an encapsulation layer disposed on the device stack.
11. The EL device of claim 10 , wherein the insulating layer comprises patterned and unpatterned regions, and wherein the patterned regions are configured to form the electrically active regions.
12. The EL device of claim 10 , wherein the insulating layer is configured to emit the light through selective regions of the flexible substrate; and
wherein the selective regions correspond to the electrically active regions.
13. The EL device of claim 10 , wherein the QD film comprises a population of QDs configured to emit red, green, or blue light.
14. The EL device of claim 10 , wherein the encapsulation layer comprises a coupling layer and a barrier film; and
wherein the coupling layer includes a pressure sensitive adhesive layer and is configured to attach the barrier film to an electrode.
15. The EL device of claim 10 , wherein the encapsulation layer comprises a pressure sensitive adhesive layer comprising a water vapor transmission rate (WVTR) ranging from about 10 −5 g/m 2 -day to about 10 g/m 2 -day.
16. The EL device of claim 10 , wherein the encapsulation layer comprises a barrier film comprising a metal laminate or a metal foil.
17. The EL device of claim 10 , wherein the encapsulation layer comprises a barrier film comprising an optically transparent, reflective, or opaque material.
18. The EL device of claim 10 , wherein the encapsulation layer comprises a coupling layer and a barrier film; and
wherein the coupling layer and barrier film comprise flexible materials.
19. The EL device of claim 10 , further comprising a second encapsulation layer disposed on the flexible substrate.
20. The EL device of claim 19 , further comprising a color processing layer disposed on the second encapsulation layer and configured to filter or down convert the light to produce a processed light having a second peak wavelength different from the first peak wavelength.