Organic electroluminescence element and manufacturing method thereof
View Patent ↗The organic electroluminescence element includes a substrate and an anode metal layer above the substrate. The anode metal layer includes an inner region between a pair of outer regions. A metal oxide layer is above the inner region and the outer regions of the anode metal layer. An insulating layer is above the metal oxide layer and the outer regions of the anode metal layer. A hole transport layer is above the metal oxide layer and the inner region of the anode metal layer. An organic luminescent layer is above the hole transport layer. A cathode layer is above the organic luminescent layer for injecting electrons into the organic luminescent layer. A thickness of the metal oxide layer on the inner region of the anode metal layer is greater than a thickness of the metal oxide layer on the outer regions of the anode metal layer.
1. An organic electroluminescence element, comprising:
a substrate;
an anode metal layer above the substrate, the anode metal layer including an inner region between a pair of outer regions;
a metal oxide layer on the inner region and the outer regions of the anode metal layer, the metal oxide layer formed by oxidation of a top surface of the anode metal layer;
an insulating layer above the metal oxide layer and the outer regions of the anode metal layer;
a hole transport layer above the metal oxide layer and the inner region of the anode metal layer, the hole transport layer comprising a hole-transporting organic material;
an organic luminescent layer above the hole transport layer; and
a cathode layer above the organic luminescent layer for injecting electrons into the organic luminescent layer,
wherein a thickness of the metal oxide layer on the inner region of the anode metal layer is greater than a thickness of the metal oxide layer on the outer regions of the anode metal layer.
2. The organic electroluminescence element according to claim 1 , wherein a lower surface of the metal oxide layer on the inner region of the anode metal layer is below a lower surface of the metal oxide layer on the outer regions of the anode metal layer.
3. The organic electroluminescence element according to claim 1 , wherein the anode metal layer includes:
an anode metal lower layer having a visible light reflectivity of at least 60%; and
an anode metal upper layer on the anode metal lower layer between the anode metal lower layer and the metal oxide layer.
4. The organic electroluminescence element according to claim 3 ,
wherein the anode metal lower layer comprises at least one of aluminum and silver, and
the anode metal upper layer comprises at least one of molybdenum, chrome, vanadium, tungsten, nickel, and iridium.
5. The organic electroluminescence element according to claim 3 , wherein a thickness of the anode metal upper layer in the inner region is at most 20 nm.
6. The organic electroluminescence element according to claim 5 , wherein the anode metal upper layer is not in the inner region of the anode metal layer.
7. The organic electroluminescence element according to claim 1 , wherein the anode metal layer comprises at least one of silver, molybdenum, chrome, vanadium, tungsten, nickel, and iridium.
8. A lighting device including the organic electroluminescence element according to claim 1 .
9. An image display device including the organic electroluminescence element according to claim 1 .
10. An organic electroluminescence element, comprising:
a substrate;
an anode metal layer above the substrate, the anode metal layer including an inner region between a pair of outer regions;
a metal oxide layer on the inner region and the outer regions of the anode metal layer, the metal oxide layer formed by oxidation of a top surface of the anode metal layer;
an insulating layer above the metal oxide layer and the outer regions of the anode metal layer;
a hole transport layer above the metal oxide layer and the inner region of the anode metal layer, the hole transport layer comprising a hole-transporting organic material;
an organic luminescent layer above the hole transport layer; and
a cathode layer above the organic luminescent layer for injecting electrons into the organic luminescent layer,
wherein the metal oxide layer extends continuously on the anode metal layer from one of the outer regions, along the inner region, and to an other of the outer regions, and
at a boundary of the inner region and the outer regions, a lower surface of the metal oxide layer on the inner region is located below the lower surface of the metal oxide layer on the outer regions.
11. The organic electroluminescence element according to claim 10 , wherein the anode metal layer includes:
an anode metal lower layer having a visible light reflectivity of at least 60%; and
an anode metal upper layer on the anode metal lower layer between the anode metal lower layer and the metal oxide layer.
12. The organic electroluminescence element according to claim 11 ,
wherein the anode metal lower layer comprises at least one of aluminum and silver, and
the anode metal upper layer comprises at least one of molybdenum, chrome, vanadium, tungsten, nickel, and iridium.
13. The organic electroluminescence element according to claim 11 , wherein a thickness of the anode metal upper layer in the inner region is at most 20 nm.
14. The organic electroluminescence element according to claim 13 , wherein the anode metal upper layer is not in the inner region of the anode metal layer.
15. The organic electroluminescence element according to claim 10 , wherein the anode metal layer comprises at least one of silver, molybdenum, chrome, vanadium, tungsten, nickel, and iridium.
16. A lighting device including the organic electroluminescence element according to claim 10 .
17. An image display device including the organic electroluminescence element according to claim 10 .
18. An organic electroluminescence element, comprising:
a substrate;
an anode metal layer above the substrate, the anode metal layer including an inner region between a pair of outer regions;
a metal oxide layer on the inner region of the anode metal layer, the metal oxide layer formed by oxidation of a top surface of the anode metal layer;
an insulating layer on the outer regions of the anode metal layer;
a hole transport layer above the metal oxide layer and the inner region of the anode metal layer, the hole transport layer comprising a hole-transporting organic material;
an organic luminescent layer above the hole transport layer; and
a cathode layer above the organic luminescent layer for injecting electrons into the organic luminescent layer,
wherein a lower surface and sides of the metal oxide layer abut the anode metal layer.
19. The organic electroluminescence element according to claim 18 , wherein the anode metal layer includes:
an anode metal lower layer having a visible light reflectivity of at least 60%; and
an anode metal upper layer on the anode metal lower layer between the anode metal lower layer and the metal oxide layer and between the anode metal lower layer and the insulating layer.
20. The organic electroluminescence element according to claim 19 ,
wherein the anode metal lower layer comprises at least one of aluminum and silver, and
the anode metal upper layer comprises at least one of molybdenum, chrome, vanadium, tungsten, nickel, and iridium.
21. The organic electroluminescence element according to claim 19 , wherein a thickness of the anode metal upper layer in the inner region is at most 20 nm.
22. The organic electroluminescence element according to claim 21 , wherein the anode metal upper layer is not in the inner region of the anode metal layer.
23. The organic electroluminescence element according to claim 18 , wherein the anode metal layer comprises at least one of silver, molybdenum, chrome, vanadium, tungsten, nickel, and iridium.
24. A lighting device including the organic electroluminescence element according to claim 18 .
25. An image display device including the organic electroluminescence element according to claim 18 .