Organic light emitting device lighting panel

• US 8,564,001 B2
• Filed: 05/18/2011
• Issued: 10/22/2013
• Est. Priority Date: 05/21/2010
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Hack, Michael, Brown, Julia J., Levermore, Peter, Weaver, Michael S.
• Primary Examiner(s): Nguyen, Thinh T
• Application Number:
  US13/110,298
• Publication Number:
  US 20110284899A1
• Time in Patent Office: 888 Days
• Field of Search: 438/82, 438/99, 438/22, 438/25, 257/98, 257/102, 257/103, 257/40, 257/E33.061
• US Class Current: 257/98
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/87 Arrangements for heating or cooling
• CPC Class Codes: H10K 59/8794 Arrangements for heating and cooling

Abstract

A first device that may include one or more organic light emitting devices. At least 65 percent of the photons emitted by the organic light emitting devices are emitted from an organic phosphorescent emitting material. An outcoupling enhancer is optically coupled to each organic light emitting device. In one embodiment, the light panel is not attached to a heat management structure. In one embodiment, the light panel is capable of exhibiting less than a 10 degree C. rise in junction temperature when operated at a luminous emittance of 9,000 lm/m² without the use of heat management structures, regardless of whether the light panel is actually attached to a heat management structure or not. The light panel may be attached to a heat management structure. The light panel may be not attached to a heat management structure.

Claims

1. A first device, comprising:

a light panel, the light panel comprising;

one or more organic light emitting devices,

wherein at least 65 percent of the photons emitted by the organic light emitting devices are emitted from an organic phosphorescent emitting material; and

wherein in an emitting material having emission with the highest energy peak in the emission spectrum, the energy gap between the highest LUMO through which an electron passes and the lowest HOMO through which a hole passes before forming an exciton on the emitting material is not more than 0.6 eV greater than the energy of the highest energy peak;

an outcoupling enhancer optically coupled to each organic light emitting device.

2. The first device of claim 1, wherein the light panel is not attached to a heat management structure.

3. The first device of claim 1, wherein the light panel exhibits less than a 10 degree C. junction temperature rise when operated at 9,000 lm/m² without the use of heat management structures.

4. The device of claim 3, wherein the light panel is attached to a heat management structure.

5. The first device of claim 3, wherein the light panel is not attached to a heat management structure.

6. The first device of claim 1, wherein each organic light emitting device has an internal quantum efficiency of 70 to 100 percent.

7. The first device of claim 1, wherein each organic light emitting device has an internal quantum efficiency of 90 to 100 percent.

8. The first device of claim 1, wherein the light panel has a luminance emittance of at least 9,000 lm/m².

9. The first device of claim 1, wherein the light panel has a luminance emittance of at least 15,000 lm/m².

10. The first device of claim 1, wherein at least one of the organic light emitting devices further comprises:

a first sublayer comprising a first organic host and a first organic emitting dopant, the first organic emitting dopant having a peak emissive wavelength in the visible range between 400 and 500 nm;

a second sublayer disposed adjacent to the first sublayer and closer to an anode of the first device than the first sublayer, the second sublayer comprising a second organic host different from the first organic host, a second organic emitting dopant having a peak emissive wavelength in the visible range between 500 and 600 nm; and

a third organic emitting dopant having a peak emissive wavelength in the visible range between 600 and 700 nm.

11. The first device of claim 1, wherein the first device is the light panel.

12. The first device of claim 1, wherein the first device is a consumer device.

13. The first device of claim 1, wherein the one or more organic light emitting devices are disposed on a substrate of a material selected from glass, plastic and metal.

14. The first device of claim 1, wherein all structures directly attached to the light panel consist essentially of materials selected from the group of glass and plastic.

15. The first device of claim 1, wherein the light panel has a panel area of at least 25 cm².

16. The first device of claim 1, wherein the first device includes one or more bus lines, each organic emitting device includes a first electrode comprising a transparent conductive oxide, and every point on the first electrode is within 2 cm of a bus line to which the first electrode is electrically connected.

17. The first device of claim 1, wherein the lighting panel has resistive power loss in bus lines and electrodes not more than 10%.

18. The first device of claim 1, wherein the lighting panel has resistive power loss in the electrodes not more than 2%.

19. The first device of claim 1, wherein the lighting panel has resistive power loss in the bus lines and electrodes not more than 5%.

20. The first device of claim 1, wherein the light panel when operating at 9,000 lm/m² has luminance uniformity <

10% at a distance greater than 1.5 cm from the bus line to which the first electrode is electrically connected.

21. The first device of claim 1, wherein the light panel when operating at 9,000 lm/m² has luminance uniformity <

10% at a distance greater than 1.5 cm from the bus line to which the first electrode is electrically connected and where the sheet resistance of the first electrode >

10 Ω

/sq.

22. The first device of claim 1, wherein all emitting materials in the one or more organic light emitting devices are organic phosphorescent emitting materials.

23. The first device of claim 1, wherein at least one of the emitting materials in the one or more organic light emitting devices is an organic fluorescent emitting material having an emissive spectrum with a highest peak in the visible wavelength range between 400 nm and 500 nm.

24. The first device of claim 1, wherein the light panel has a CRI (Ra) of at least 80 and a Duv less than 0.008 when operated at 9,000 lm/m².

25. A method comprising:

providing a first device, comprising a light panel, the light panel further comprising;

one or more organic light emitting devices, wherein at least 65 percent of the photons emitted by the organic light emitting devices are emitted from an organic phosphorescent emitting material;

an outcoupling enhancer optically coupled to each organic light emitting device;

wherein, in an emitting material having emission spectrum with the highest energy peak in the emission spectrum, the energy gap between highest LUMO through which an electron passes and the lowest HOMO through which a hole passes before forming an exciton on the emitting material is not more than 0.6 eV greater than the energy of the highest energy peak;

an outcoupling enhancer optically coupled to each organic light emitting device;

operating the light panel at a luminance level of at least 9,000 lm/m².

26. The method of claim 25, wherein the light panel is not attached to a heat management structure.

27. The method of claim 25, wherein the light panel is capable of exhibiting less than a 10 degree C. rise in junction temperature rise when operated at 9,000 lm/m² without the use of heat management structures.

28. The method of claim 27, wherein the light panel is attached to a heat management structure.

29. The method of claim 27, wherein the light panel is not attached to a heat management structure.