Organic light emitting device having a microcavity

• US 20080067921A1
• Filed: 09/15/2006
• Published: 03/20/2008
• Est. Priority Date: 09/15/2006
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: D'Andrade, Brian, Weaver, Mike
• Granted Patent: US 7,800,295 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
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths

Abstract

The present invention provides OLEDs incorporating microcavities. By combining a microcavity with a non-microcavity emissive layer, improved saturation and luminance may be achieved. OLEDs incorporating microcavities according to the invention may be used to produce white light, and as sub-pixels in full-color displays.

Claims

1. A device comprising:

a first electrode;

a second electrode;

a third electrode;

a first organic emissive layer disposed between the first electrode and the second electrode; and

a second organic emissive layer disposed between the second electrode and the third electrode;

wherein;

the first electrode and the second electrode define a microcavity;

there are no electrodes between the first electrode and the second electrode;

the second electrode and the third electrode define a standard OLED; and

the device emits light having a CIE of (0.33±

0.05, 0.33±

0.05).

2. The device of claim 1 wherein the device has an operational half-life of at least 25,000 hours at 500 cd/m².

3. The device of claim 1 wherein the device has an operational half-life of at least 40,000 hours at 500 cd/m².

4. The device of claim 1 wherein the device has an operational half-life of at least 25,000 hours at 1500 cd/m².

5. The device of claim 1 wherein the device emits light having a CIE of (0.33±

0.01, 0.33±

0.01).

6. The device of claim 1 wherein the microcavity defined by the first electrode and the second electrode has a finesse of at least 5.

7. The device of claim 1 wherein the microcavity emits light having a CIE with an x-coordinate less than 0.30 and a y-coordinate of less than 0.40.

8. The device of claim 1 wherein the microcavity emits light having a CIE with an x-coordinate less than 0.20 and a y-coordinate of less than 0.30.

9. The device of claim 1 wherein the microcavity emits a first spectrum of light having a first peak and the second organic layer emits a second spectrum of light having a second peak, and wherein the first peak occurs at a shorter wavelength than the second peak.