Organic light emitting device

Patent metadata

Field	Value
Publication number	US-9502475-B2
Application number	US-201414552795-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Nov 29, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

Disclosed is an organic light emitting device. The organic light emitting device includes a first emission unit configured to include a first red emission layer which emits red light, a first green emission layer which emits green light, and a first blue emission layer which emits blue light, a second emission unit configured to include a second red emission layer which emits red light, a second green emission layer which emits green light, and a second blue emission layer which emits blue light, a charge generation layer disposed between the first emission unit and the second emission unit, a first electrode formed as a reflective electrode, and configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit, and a second electrode configured to supply an electric charge having a second polarity to the first and second emission units.

First claim

What is claimed is:

1. An organic light emitting device in which a micro cavity is disposed between a first electrode and a second electrode, the organic light emitting device comprising:
a first emission unit including a first red emission layer in a red pixel, a first green emission layer in a green pixel, and a first blue emission layer in a blue pixel;
a second emission unit including a second red emission layer in the red pixel, a second green emission layer in the green pixel, and a second blue emission layer in the blue pixel; and
a charge generation layer disposed between the first emission unit and the second emission unit, wherein,
the first electrode is a reflective electrode configured to supply an electric charge having a first polarity to the first emission unit and the second emission unit,
the second electrode is a semi-transmissive electrode configured to supply an electric charge having a second polarity to the first emission unit and the second emission unit, and
at least one selected from the first red emission layer, the first green emission layer, and the first blue emission layer is configured to emit light having a wavelength range which differs from wavelength ranges of light that the second red emission layer, the second green emission layer, and the second blue emission layer are respectively configured to emit.

2. The organic light emitting device of claim 1 , wherein the first emission unit further includes:
a hole injection layer disposed on the first electrode;
a first hole transport layer disposed on the hole injection layer; and
a first electron transport layer disposed on the first red emission layer, the first green emission layer, and the first blue emission layer.

3. The organic light emitting device of claim 2 , wherein,
blue light is emitted out of the blue pixel through the micro cavity of the blue pixel adjusted using a thickness of the first hole transport layer,
the hole injection layer has substantially same thickness in the red, green, and blue pixels,
the first hole transport layer has substantially same thickness in the red, green, and blue pixels, and
the first electron transport layer has substantially same thickness in the red, green, and blue pixels.

4. The organic light emitting device of claim 3 , wherein the second emission unit further includes:
a second hole transport layer disposed on the charge generation layer; and
a second electron transport layer disposed on the second red emission layer, the second green emission layer, and the second blue emission layer.

5. The organic light emitting device of claim 4 , wherein red light is emitted out of the red pixel through the micro cavity of the red pixel adjusted using a thickness of at least one of the first and second red emission layers.

6. The organic light emitting device of claim 4 , wherein green light is emitted out of the green pixel through the micro cavity of the green pixel adjusted using a thickness of at least one of the first and second green emission layers.

7. The organic light emitting device of claim 1 , wherein,
an organic emission layer of the red pixel has a thickness of 250 nm to 310 nm,
an organic emission layer of the green pixel has a thickness of 200 nm to 270 nm, and
an organic emission layer of the blue pixel has a thickness of 150 nm to 230 nm.

8. The organic light emitting device of claim 1 , wherein,
the first and second red emission layers have a thickness of 65 nm to 85 nm,
the first and second green emission layers have a thickness of 35 nm to 50 nm, and
the first and second blue emission layers have a thickness of 15 nm to 30 nm.

9. The organic light emitting device of claim 1 , wherein,
the first red emission layer comprises a first red dopant, and
the second red emission layer comprises a second red dopant having a unique emission wavelength range which differs from a unique emission wavelength range of the first red dopant.

10. The organic light emitting device of claim 9 , wherein a difference between a main peak of an emission wavelength of the first red dopant and a main peak of an emission wavelength of the second red dopant is within 30 nm.

11. The organic light emitting device of claim 10 , wherein,
the first red emission layer and the second red emission layer respectively emit red lights having different wavelength ranges,
a difference between the wavelength ranges of the red lights respectively emitted from the first red emission layer and the second red emission layer is within 30 nm, and
red light having one wavelength range is emitted by the micro cavity.

12. The organic light emitting device of claim 1 , wherein,
the first green emission layer comprises a first green dopant, and
the second green emission layer comprises a second green dopant having a unique emission wavelength range which differs from a unique emission wavelength range of the first green dopant.

13. The organic light emitting device of claim 12 , wherein a difference between a main peak of an emission wavelength of the first green dopant and a main peak of an emission wavelength of the second green dopant is within 30 nm.

14. The organic light emitting device of claim 13 , wherein,
the first green emission layer and the second green emission layer respectively emit green lights having different wavelength ranges,
a difference between the wavelength ranges of the green lights respectively emitted from the first green emission layer and the second green emission layer is within 30 nm, and
green light having one wavelength range is emitted by the micro cavity.

15. The organic light emitting device of claim 1 , wherein,
the first blue emission layer comprises a first blue dopant, and
the second blue emission layer comprises a second blue dopant having a unique emission wavelength range which differs from a unique emission wavelength range of the first blue dopant.

16. The organic light emitting device of claim 15 , wherein a difference between a main peak of an emission wavelength of the first blue dopant and a main peak of an emission wavelength of the second blue dopant is within 30 nm.

17. The organic light emitting device of claim 16 , wherein,
the first blue emission layer and the second blue emission layer respectively emit blue lights having different wavelength ranges,
a difference between the wavelength ranges of the blue lights respectively emitted from the first blue emission layer and the second blue emission layer is within 30 nm, and
blue light having one wavelength range is emitted by the micro cavity.

18. The organic light emitting device of claim 1 , wherein a wavelength range of light the first red emission layer is configured to emit differs from a wavelength range of light the second red emission layer is configured to emit.

19. The organic light emitting device of claim 1 , wherein a wavelength range of light the first green emission layer is configured to emit differs from a wavelength range of light the second green emission layer is configured to emit.

20. The organic light emitting device of claim 1 , wherein a wavelength range of light the first blue emission layer is configured to emit differs from a wavelength range of light the second blue emission layer is configured to emit.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Se Hee

Classifications

• H10K59/32

  Stacked devices having two or more layers, each emitting at different wavelengths · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H01L51/5265

  Electricity · mapped topic

• H01L51/5278

  Electricity · mapped topic

• H01L27/3209 Primary

  Electricity · mapped topic