Organic light emitting device having a transparent microcavity

• US 7,710,017 B2
• Filed: 09/08/2006
• Issued: 05/04/2010
• Est. Priority Date: 09/08/2006
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: D'Andrade, Brian, Adamovich, Vadim
• Primary Examiner(s): Santiago; Mariceli
• Application Number:
  US11/517,513
• Publication Number:
  US 20080061680A1
• Time in Patent Office: 1,334 Days
• Field of Search: 313500-512, 428/690
• US Class Current: 313/503
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

An organic light emitting device having a microcavity is provided. The device may be transparent to the resonant wavelength of the microcavity, allowing for saturated emission at the wavelength or wavelengths of light transmitted by the microcavity.

Claims

1. A device comprising:

an anode;

a cathode; and

an organic emissive layer disposed between the anode and the cathode, wherein;

the anode and the cathode define a microcavity;

one of the anode or the cathode, or both, have a reflectance of at least 55% for light over the visible spectrum and a transmission of at most 45% for light over the visible spectrum;

there are no electrodes between the anode and the cathode;

the device transmits 30-100% of light at a resonant wavelength of the microcavity;

the device transmits 0-30% of light at least one wavelength in the visible region not equal to a resonant wavelength of the microcavity; and

the spectrum of light emitted by the device has a peak with a full-width at half-maximum of 60 nm or less.

2. The device of claim 1, wherein the spectrum of light emitted by the device has a peak with a full-width at half-maximum of 30 nm to 60 nm.

3. The device of claim 1, wherein the microcavity has a finesse of 1.5 to 5.

4. The device of claim 1, wherein the device transmits 15-100% of light having a wavelength within 30 nm of a resonant wavelength of the microcavity.

5. The device of claim 1, further comprising an organic non-emissive layer disposed between the anode and the single organic emissive layer.

6. The device of claim 1, further comprising an organic non-emissive layer disposed between the cathode and the single organic emissive layer.

7. The device of claim 1, wherein only a single organic emissive layer is disposed between the anode and the cathode.

8. The device of claim 1, wherein the cathode has a reflectance of at least 55% for light over the visible spectrum and a transmission of at most 45% for light over the visible spectrum.

9. The device of claim 1, wherein the anode has a reflectance of at least 55% for light over the visible spectrum and a transmission of at most 45% for light over the visible spectrum.