Organic light emitting device and method for manufacturing the same
Disclosed is an organic light emitting device (OLED) that may include a first electrode including at least two conductive units, each of the at least two conductive units connected to a conductive connector of the first electrode; a second electrode facing the first electrode; a current carrying electrode electrically connected to the at least two conductive units, wherein the current carrying electrode includes a current carrying portion of the first electrode connected to the conductive connector of each of the at least two conductive units or an auxiliary electrode formed of a material different from that of the first electrode; and an organic layer between the first electrode and the second electrode; wherein the conductive connector includes an area in which a length of a direction, in which a current substantially flows, is at least ten times longer than a width of a direction vertical to the length of the direction, and wherein a resistance of the conductive connector is 400Ω or more and 300,000Ω or less.
1. An organic light emitting device (OLED), comprising:
a first electrode including at least two conductive units, each of the at least two conductive units connected to a conductive connector of the first electrode;
a second electrode facing the first electrode;
a current carrying electrode is electrically connected to the at least two conductive units, wherein the current carrying electrode includes an auxiliary electrode formed of a material different from that of the first electrode,
a short-circuit preventing layer between the first electrode and the auxiliary electrode, and wherein the short-circuit preventing layer is provided on a bottom surface of the auxiliary electrode, and
an organic layer between the first electrode and the second electrode,
wherein the conductive connector includes an area in which a length of a direction, in which a current substantially flows, is at least ten times longer than a width of a direction vertical to the length of the direction, and
wherein a resistance of the conductive connector is 400Ω or more and 300,000Ω or less.
2. The OLED according to claim 1 , wherein the at least two conductive units are electrically connected to each other in parallel.
3. The OLED according to claim 1 , wherein the current carrying electrode is a combination of a current carrying portion of the first electrode and the auxiliary electrode.
4. The OLED according to claim 1 , wherein at current density of any one value of 1 mA/cm 2 to 5 mA/cm 2 , the conducive connector has a resistance value at which an operating voltage increase ratio of the following Formula 1 and a numerical value of operating current to leakage current of the following Formula 2 simultaneously satisfy 0.03 or less:
V
t
-
V
o
V
o
[
Formula
1
]
I
s
I
t
[
Formula
2
]
wherein V t (V) denotes operating voltage of the OLED to which the conductive connector is applied and in which a short-circuit defect is absent,
V o (V) denotes an operating voltage of the OLED to which the conductive connector is not applied and in which the short-circuit defect is absent,
I t (mA) denotes an operating current of the OLED to which the conductive connector is applied and in which the short-circuit defect is absent, and
I s (mA) denotes a leakage current of the OLED to which the conductive connector is applied and in which the short-circuit defect is present in any one conductive unit.
5. The OLED according to claim 1 , wherein resistance of the conductive connector is 1,000Ω or more and 300,000Ω or less.
6. The OLED according to claim 1 , wherein the first electrode includes at least 1,000 conductive units separate from each other.
7. The OLED according to claim 1 , wherein an area of each conductive unit is 0.01 mm 2 or more and 25 mm 2 or less.
8. The OLED according to claim 1 , wherein a surface resistance of the conductive unit is 1Ω/□ or more.
9. The OLED according to claim 1 , a wherein resistance from the one conductive unit to another conductive unit adjacent thereto is at least twofold of a resistance of the conductive connector.
10. The OLED according to claim 1 , wherein a resistance from the one conductive unit to another conductive unit adjacent thereto is 800Ω or more and 600,000Ω or less.
11. The OLED according to claim 1 , wherein a material of the conductive connector is the same as a material of the conductive unit.
12. The OLED according to claim 1 , wherein a surface resistance of the auxiliary electrode is 3Ω/□ or less.
13. The OLED according to claim 1 , wherein at least one area of each conductive unit is positioned on a light emitting area of the OLED.
14. The OLED according to claim 3 , wherein the current carrying portion of the first electrode, the auxiliary electrode, and the conductive connector are provided in a non-emitting area of the OLED.
15. The OLED according to claim 1 , wherein an occupying area of the conductive units in the OLED is 50% or more and 90% or less based on a top view of an entire OLED.
16. The OLED according to claim 1 , wherein a resistance from the auxiliary electrode to the first electrode is 400Ω or more and 300,000Ω or less.
17. The OLED according to claim 1 , wherein the auxiliary electrode is electrically connected to the conductive connector through the short-circuit preventing layer.
18. The OLED according to claim 1 , wherein a thickness of the short-circuit preventing layer is 1 nm or more and 10 μm or less.
19. The OLED according to claim 1 , wherein a volume resistivity of the short-circuit preventing layer is 0.63 Ω-cm or more and 8.1×10 10 Ω-cm or less.
20. The OLED according to claim 1 , wherein the short-circuit preventing layer includes one or more of a carbon powder; a carbon film; a conductive polymer; an organic polymer; a metal; a metal oxide; an inorganic oxide; a metal sulfide; and an insulating material.
21. The OLED according to claim 1 , wherein the first electrode is a transparent electrode.
22. The OLED according to claim 3 , wherein the auxiliary electrode is a metal electrode.
23. The OLED according to claim 3 , wherein the auxiliary electrode includes conductive lines electrically connected to each other.
24. The OLED according to claim 1 , wherein the organic layer further includes a light emitting layer and one or more selected from a group consisting of a hole injecting layer; a hole transporting layer; a hole preventing layer; a charge generating layer; an electron preventing layer; an electron transporting layer; and an electron injecting layer.
25. The OLED according to claim 1 , further comprising:
a substrate,
wherein the first electrode is provided on the substrate.
26. The OLED according to claim 1 , wherein the OLED emits a white light having a color temperature of 2,000 K or more and 12,000 K or less.
27. The OLED according to claim 1 , further comprising:
a substrate provided on a surface of the first electrode, which is the opposite surface of the first electrode on which an organic layer is provided; and
a light scattering layer provided between the substrate and the first electrode.
28. The OLED according to claim 27 , wherein the light scattering layer includes a flattening layer.
29. The OLED according to claim 1 , further comprising:
a substrate provided on a surface facing a surface on which an organic layer of the first electrode is provided; and
a light scattering layer provided on a surface facing a surface on which the first electrode of the substrate is provided.
30. The OLED according to claim 1 , wherein the OLED is a flexible OLED.
31. The OLED according to claim 1 , wherein the OLED is a display device or a lighting device.
32. A method for manufacturing an organic light emitting device (OLED), the method comprising:
forming a first electrode including at least two conductive units each of the at least two conductive units connected a conductive connector of the first electrode, the conductive connector having a resistance of 400Ω or more and 300,000Ω or less;
forming a short-circuit preventing layer on the first electrode;
forming a current carrying electrode electrically connected to the at least two conductive units, wherein the current carrying electrode includes an auxiliary electrode formed of a material different from that of the first electrode, and wherein the short-circuit preventing layer is provided on a bottom surface of the auxiliary electrode;
forming an organic layer on the first electrode; and
forming a second electrode on the organic layer.
33. The method according to claim 32 , wherein the forming of the first electrode applies a first electrode material on the substrate and then patterns the first electrode material.
34. The method according to claim 32 , further comprising:
forming the current carrying electrode is formed by forming a current carrying portion of the first electrode and forming the auxiliary electrode on the current carrying portion of the first electrode.