ORGANIC LIGHT EMITTING DEVICE ARCHITECTURE

• US 20090200927A1
• Filed: 12/11/2008
• Published: 08/13/2009
• Est. Priority Date: 02/09/2008
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: D'Andrade, Brian, Esler, James
• Granted Patent: US 8,040,053 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light

Abstract

An organic light emitting device is provided. The device includes an anode and a cathode. A first emissive layer is disposed between the anode and the cathode. The first emissive layer includes a first non-emitting organic material, which is an organometallic material present in the first emissive layer in a concentration of at least 50 wt %. The first emissive layer also includes a first emitting organic material. A second emissive layer is disposed between the first emissive layer and the cathode, preferably, in direct contact with the first emissive layer. The second emissive material includes a second non-emitting organic material and a second emitting organic material. The first and second non-emitting materials, and the first and second emitting materials, are all different materials. A first non-emissive layer is disposed between the first emissive layer and the anode, and in direct contact with the first emissive layer. The first non-emissive layer comprises the first non-emissive organic material.

Claims

1. An organic light emitting device, comprising:

an anode;

a cathode;

a first emissive layer disposed between the anode and the cathode, the first emissive layer comprising;

a first non-emitting organic material, wherein the first non-emitting material is organometallic and is present in the first emissive layer in a concentration of at least 50 wt %; and

a first emitting organic material;

a second emissive layer disposed between the first emissive layer and the cathode, and in direct contact with the first emissive layer, the second emissive layer comprising;

a second non-emitting organic material; and

a second emitting organic material;

a first non-emissive layer disposed between the first emissive layer and the anode, and in direct contact with the first emissive layer, the first non-emissive layer comprising the first non-emissive organic material.

2. The device of claim 1, further comprising a second non-emissive layer disposed between the second emissive layer and the cathode, and in direct contact with the second emissive layer, the second non-emissive layer comprising the second non-emitting organic material.

3. The device of claim 2, wherein the first and second emitting organic materials are phosphorescent materials.

4. The device of claim 2, wherein the first emitting material is present in the first emissive layer in a concentration of 0.1 to 6 wt %.

5. The device of claim 4, wherein the first emitting material is present in the first emissive layer in a concentration of 0.1 to 3 wt %.

6. The device of claim 2, wherein:

the first emissive layer consists essentially of the first non-emitting organic material and the first emitting organic material;

the first non-emissive layer consists essentially of the first non-emitting organic material;

the second emissive layer consists essentially of the second non-emitting organic material and the second emitting organic material;

the second non-emissive layer consists essentially of the second non-emitting organic material.

7. The device of claim 6, further comprising a third non-emissive layer disposed between the second non-emissive layer and the cathode, and in direct contact with the second non-emissive layer and the cathode, the third non-emissive layer comprising a third non-emitting material.

8. The device of claim 7, wherein the third non-emissive layer consists essentially of a third non-emitting material.

9. The device of claim 8, wherein the first non-emissive layer is in direct contact with the anode.

10. The device of claim 9, wherein the device consists essentially of the anode, the cathode, the first and second emitting materials, and the first, second and third non-emitting materials.

11. The device of claim 2, wherein the second emissive layer further comprises a fourth non-emitting material.

12. The device of claim 2, wherein the first emitting material has a peak emissive wavelength in the visible spectrum of 500-700 nm, and the second emitting material has a peak emissive wavelength in the visible spectrum of 400-500 nm.