White organic light emitting device
Discussed is a white organic light emitting device for enhancing emission efficiency and panel efficiency. The white organic light emitting device can include a first emission part between a first electrode and a second electrode and configured to include a first emission layer (EML), a second emission part on the first emission part and configured to include a second EML, and a third emission part on the second emission part and configured to include a third EML. The first to third emission parts have an emission position of emitting layers (EPEL) structure in which the first to third emission parts have a maximum emission range in respective emission areas of the first to third EMLs.
1. A white organic light emitting device comprising:
a first emission part between a first electrode and a second electrode, and configured to include a first emission layer (EML);
a second emission part on the first emission part, and configured to include a second EML; and
a third emission part on the second emission part, and configured to include a third EML,
wherein the first to third emission parts have an emission position of emission layers (EPEL) structure in which the first to third emission parts have a maximum emission range in respective emission areas of the first to third EMLs,
wherein two EMLs among the first EML, the second EML, and the third EML include one among:
a blue emission layer,
a blue emission layer and a yellow-green emission layer,
a blue emission layer and a red emission layer, and
a blue emission layer and a green emission layer, and
wherein a remaining one EML among the first EML, the second EML, and the third EML includes one among:
a yellow-green emission layer,
a yellow emission layer and a red emission layer,
a red emission layer and a green emission layer, and
a yellow-green emission layer and a red emission layer.
2. The white organic light emitting device of claim 1 , wherein the white organic light emitting device is a bottom emission type.
3. The white organic light emitting device of claim 2 , wherein a position of the first electrode is within a range of 4,500 Å to 6,000 Å from the second electrode.
4. The white organic light emitting device of claim 2 , wherein the emission position of the third EML is within a range of 200 Å to 800 Å from the second electrode.
5. The white organic light emitting device of claim 2 , wherein the emission position of the second EML is within a range of 1,800 Å to 2,550 Å from the second electrode.
6. The white organic light emitting device of claim 2 , wherein the emission position of the first EML is within a range of 2,650 Å to 3,300 Å from the second electrode.
7. The white organic light emitting device of claim 1 , wherein the first EML is configured with one among:
the blue emission layer,
the blue emission layer and the yellow-green emission layer,
the blue emission layer and the red emission layer, and
the blue emission layer and the green emission layer, or
is configured by a combination thereof.
8. The white organic light emitting device of claim 1 , wherein the second EML is configured with one among:
the yellow-green emission layer,
the yellow emission layer and the red emission layer,
the red emission layer and the green emission layer, and
the yellow-green emission layer and the red emission layer, or
is configured by a combination thereof.
9. The white organic light emitting device of claim 1 , wherein the third EML is configured with one among:
the blue emission layer,
the blue emission layer and the yellow-green emission layer,
the blue emission layer and the red emission layer, and
the blue emission layer and the green emission layer, or
is configured by a combination thereof.
10. The white organic light emitting device of claim 1 , wherein,
a peak wavelength of the emission area of the first EML is in a range of 440 nm to 650 nm,
a peak wavelength of the emission area of the second EML is in a range of 510 nm to 650 nm, and
a peak wavelength of the emission area of the third EML is in a range of 440 nm to 650 nm.
11. The white organic light emitting device of claim 1 , wherein,
the maximum emission range of the first EML is 440 nm to 470 nm,
the maximum emission range of the second EML is 530 nm to 570 nm, and
the maximum emission range of the third EML is 440 nm to 470 nm.
12. The white organic light emitting device of claim 2 , wherein the second EML and the third EML respectively comprise emission layers that emit light having the same color.
13. The white organic light emitting device of claim 12 , wherein a position of the first electrode is within a range of 3,500 Å to 4,500 Å from the second electrode.
14. The white organic light emitting device of claim 12 , wherein the emission position of the third EML is within a range of 250 Å to 800 Å from the second electrode.
15. The white organic light emitting device of claim 12 , wherein the emission position of the second EML is within a range of 1,450 Å to 1,950 Å from the second electrode.
16. The white organic light emitting device of claim 12 , wherein the emission position of the first EML is within a range of 2,050 Å to 2,600 Å from the second electrode.
17. The white organic light emitting device of claim 12 , wherein the first EML is configured with one among:
the yellow-green emission layer,
the yellow emission layer and the red emission layer,
the red emission layer and the green emission layer, and
the yellow-green emission layer and the red emission layer, or
is configured by a combination thereof.
18. The white organic light emitting device of claim 12 , wherein each of the second EML and the third EML is configured with one among:
the blue emission layer,
the blue emission layer and the yellow-green emission layer,
the blue emission layer and the red emission layer, and
the blue emission layer and the green emission layer, or
is configured by a combination thereof.
19. The white organic light emitting device of claim 12 , wherein,
a peak wavelength of the emission area of the first EML is in a range of 510 nm to 650 nm,
a peak wavelength of the emission area of the second EML is in a range of 440 nm to 650 nm, and
a peak wavelength of the emission area of the third EML is in a range of 440 nm to 650 nm.
20. The white organic light emitting device of claim 12 , wherein,
the maximum emission range of the first EML is 530 nm to 570 nm,
the maximum emission range of the second EML is 440 nm to 470 nm, and
the maximum emission range of the third EML is 440 nm to 470 nm.
21. The white organic light emitting device of claim 1 , wherein the white organic light emitting device is a top emission type.
22. The white organic light emitting device of claim 21 , wherein a position of the second electrode is within a range of 4,700 Å to 5,400 Å from the first electrode.
23. The white organic light emitting device of claim 21 , wherein the emission position of the first EML is within a range of 150 Å to 700 Å from the first electrode.
24. The white organic light emitting device of claim 21 , wherein the emission position of the second EML is within a range of 1,600 Å to 2,300 Å from the first electrode.
25. The white organic light emitting device of claim 21 , wherein the emission position of the third EML is within a range of 2,400 Å to 3,100 Å from the first electrode.
26. The white organic light emitting device of claim 21 , wherein the second EML and the third EML respectively comprise emission layers that emit light having the same color.
27. The white organic light emitting device of claim 26 , wherein a position of the second electrode is within a range of 4,700 Å to 5,400 Å from the first electrode.
28. The white organic light emitting device of claim 26 , wherein the emission position of the first EML is within a range of 200 Å to 700 Å from the first electrode.
29. The white organic light emitting device of claim 26 , wherein the emission position of the second EML is within a range of 1,200 Å to 1,800 Å from the first electrode.
30. The white organic light emitting device of claim 26 , wherein the emission position of the third EML is within a range of 2,400 Å to 3,100 Å from the first electrode.
31. The white organic light emitting device of claim 26 , wherein the first EML is configured with one among:
the yellow-green emission layer,
the yellow emission layer and the red emission layer,
the red emission layer and the green emission layer,
the yellow-green emission layer and the red emission layer, or
is configured by a combination thereof.
32. The white organic light emitting device of claim 26 , wherein each of the second EML and the third EML is configured with one among:
the blue emission layer,
the blue emission layer and the yellow-green emission layer,
the blue emission layer and the red emission layer, and
the blue emission layer and the green emission layer, or
is configured by a combination thereof.
33. The white organic light emitting device of claim 26 , wherein,
a peak wavelength of the emission area of the first EML is in a range of 510 nm to 650 nm,
a peak wavelength of the emission area of the second EML is in a range of 440 nm to 650 nm, and
a peak wavelength of the emission area of the third EML is in a range of 440 nm to 650 nm.
34. The white organic light emitting device of claim 26 , wherein,
the maximum emission range of the first EML is 530 nm to 570 nm,
the maximum emission range of the second EML is 440 nm to 470 nm, and
the maximum emission range of the third EML is 440 nm to 470 nm.
35. A white organic light emitting device comprising:
a first organic layer and a first emission layer (EML) on a substrate;
a second organic layer and a second EML on the first EML;
a third organic layer and a third EML on the second EML; and
a fourth organic layer on the third EML,
wherein the first to third EMLs have an emission position of emission layers (EPEL) structure in which the first to third EMLs have a maximum emission range in respective emission areas of the first to third EMLs irrespective of a specific thickness of at least one of the first organic layer, the second organic layer, and the third organic layer,
wherein two EMLs among the first, second, and third EMLs include one among:
a blue emission layer,
a blue emission layer and a yellow-green emission layer,
a blue emission layer and a red emission layer, and
a blue emission layer and a green emission layer, and
wherein a remaining one EML among the first EML, the second EML, and the third EML includes one among:
a yellow-green emission layer,
a yellow emission layer and a red emission layer,
a red emission layer and a green emission layer, and
a yellow-green emission layer and a red emission layer.
36. The white organic light emitting device of claim 35 , wherein the EPEL structure is provided for the first to third EMLs to have the maximum emission range irrespective of the specific number of layers within at least one of the first organic layers, the second organic layers, the third organic layers, and the fourth organic layers.
37. The white organic light emitting device of claim 35 , wherein the EPEL structure is provided for the first to third EMLs to have the maximum emission range irrespective of the specific thickness of at least one of the first EML, the second EML, and the third EML.
38. The white organic light emitting device of claim 35 , wherein the EPEL structure is provided for the first to third EMLs to have the maximum emission range irrespective of the specific number of layers within at least one of the first EMLs, the second EMLs, and the third EMLs.