Stacked OLEDs with a reflective conductive layer

• US 20070103066A1
• Filed: 11/04/2005
• Published: 05/10/2007
• Est. Priority Date: 11/04/2005
• Status: Abandoned Application

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: D'Andrade, Brian, Adamovich, Vadim, Hewitt, Richard, Rajan, Kamala
• Application Number:
  US11/266,181
• Publication Number:
  US 20070103066A1
• Time in Patent Office: Days
• US Class Current: 313/506
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 59/128 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/176 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/80518 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 59/84 Parallel electrical configurations of multiple OLEDs
• CPC Class Codes: H10K 59/86 Series electrical configurations of multiple OLEDs
• CPC Class Codes: H10K 59/90 Assemblies of multiple devices comprising at least one organic light-emitting element
• CPC Class Codes: H10K 59/95 wherein all light-emitting elements are organic, e.g. assembled OLED displays
• CPC Class Codes: H10K 85/311 Phthalocyanine
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/657 Polycyclic condensed heteroaromatic hydrocarbons
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Abstract

The present invention provides an OLED comprising two or more organic emissive layers electrically connected with a reflective conductive layer.

Claims

1. An organic light emitting device comprising:

a) a first organic stack including a first organic emissive layer;

b) a second organic stack including a second organic emissive layer; and

c) a reflective conductive layer disposed between, and electrically connected to, the first organic stack and the second organic stack.

2. The device of claim 1, further comprising a transparent substrate upon one face of which the first organic stack, the reflective conductive layer, and the second organic stack are deposited.

3. The device of claim 2, wherein the reflective conductive layer is deposited by vacuum thermal evaporation.

4. The device of claim 2, further comprising:

a) the first organic stack further comprising;

i) a first end electrode;

ii) a hole injection layer;

iii) a hole transport layer;

iv) the first organic emissive layer;

v) an electron transport layer;

b) the reflective conductive layer;

c) the second organic stack further comprising;

i) a hole injection layer;

ii) a hole transport layer;

iii) the second organic emissive layer;

iv) a hole blocking layer;

v) an electron transport layer; and

vi) a second end electrode,

disposed, in that order, over the transparent substrate.

5. The device of claim 1, wherein the reflective conductive layer is a substrate, and wherein the first organic stack and the second organic stack are deposited on opposite faces of the reflective conductive layer.

6. The device of claim 1, further comprising a substrate, wherein both faces of the substrate includes a reflective conductive layer, and wherein the first organic stack and the second organic stack are deposited on opposite faces of the substrate.

7. The device of claim 6, wherein the substrate comprises two electrically connected substrate layers.

8. The device of claim 1, wherein the reflective conductive layer is a cathode for both the first organic stack and the second organic stack.

9. The device of claim 1, wherein the reflective conductive layer is an anode for both the first organic stack and the second organic stack.

10. The device of claim 1, wherein the reflective conductive layer is a cathode for the first organic stack and an anode for the second organic stack

11. The device of claim 1, wherein the reflective conductive layer is a charge generation layer.

12. The device of claim 1, wherein the first organic stack and the second organic stack are serially connected.

13. The device of claim 1, wherein the first organic stack and the second organic stack are connected in parallel.

14. The device of claim 1, wherein the first organic stack and the second organic stack are independently addressable.

15. The device of claim 1, wherein the first organic stack further comprises a first end electrode, and the second organic stack further comprises a second end electrode, wherein the first end electrode and the second end electrode are transparent.

16. The device of claim 15, wherein the device emits light in 4π

steradians.

17. The device of claim 1, wherein the first organic stack and the second organic stack each further comprise one or more layers selected from the group consisting of injection layers, transport layers, and blocking layers.

18. The device of claim 1, wherein the first organic stack and the second organic stack are stacked vertically with respect to a substrate.

19. The device of claim 18, further comprising one or more additional organic stacks vertically stacked adjacent to the first organic stack or the second organic stack.

20. The device of claim 1, wherein the device is monochrome and has a fill factor of at least about 50% on each side of the reflective connecting electrode.

21. The device of claim 1, wherein the device is multi-color and has a fill factor of at least about 35% on each side of the reflective connecting electrode.

22. The device of claim 1, incorporated into a two-sided display.

23. The device of claim 1, incorporated into a illumination application.

24. The device of claim 1, wherein the reflective conductive layer is a metal film.

25. The device of claim 24, wherein the metal film has a maximum spike length of about 100 Å

.

26. The device of claim 25, wherein the metal film has a maximum spike length of about 10 Å

.

27. A method for making an organic light emitting device comprising:

a) fabricating a first organic stack over a substrate;

b) depositing a reflective conductive layer over the first organic stack; and

c) fabricating a second organic stack over the reflective connecting electrode,

wherein the reflective conductive layer is disposed between, and electrically connected to, the first organic stack and second organic stack.

28. The method of claim 27, wherein the reflective conductive layer is a metal film.

29. The method of claim 28, wherein depositing the reflective conductive layer is performed by vacuum thermal evaporation.

30. A method for making an organic light emitting device comprising:

a) fabricating a first organic stack on one face of a reflective conductive layer;

b) fabricating a second organic stack on the opposite face of a reflective conductive layer.

31. A method for making an organic light emitting device comprising:

a) fabricating a first organic stack on a reflective conductive layer attached to one face of a substrate; and

b) fabricating a second organic stack on a reflective conductive layer attached the opposite face of the substrate.