Organic EL element, organic EL display panel, and method of manufacturing organic EL display panel
Disclosed herein is an organic EL element including a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode stacked in this order over a substrate. The ground layer is light-transmitting and electrically conductive, and its surface on which the second electrode is stacked has a surface roughness of 0.3 to 2.7 nm. The second electrode is a silver thin film layer formed of silver or containing silver as a main constituent.
1. An organic EL element, comprising:
a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode stacked in this order over a substrate, wherein
the ground layer is light-transmitting and electrically conductive, and its surface on which the light-transmitting second electrode is stacked has a surface roughness of 0.3 to 2.7 nm, and
the light-transmitting second electrode is a silver thin film layer formed of silver or containing silver as a main constituent.
2. The organic EL element according to claim 1 ,
wherein a thickness of the silver thin film layer is 10 to 20 nm.
3. The organic EL element according to claim 1 ,
wherein the ground layer is an organic layer.
4. The organic EL element according to claim 1 ,
wherein the light-transmitting second electrode is a cathode, and the ground layer is an electron injection layer or an electron transport layer.
5. The organic EL element according to claim 1 ,
wherein a material for the ground layer is selected from indium tin oxide and indium zinc oxide.
6. The organic EL element according to claim 5 ,
wherein a region surrounded by a surface on a light emitting layer side of the first electrode and an interface between the ground layer and the light-transmitting second electrode constitutes an optical resonator having the surface and the interface as reflective surfaces.
7. An organic EL element, comprising:
a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode stacked in this order over a substrate, wherein
the ground layer is light-transmitting and electrically conductive, and its surface on which the light-transmitting second electrode is stacked has a surface free energy of 33 to 97 mJ/m 2 , and
the light-transmitting second electrode is a silver thin film layer formed of silver or containing silver as a main constituent.
8. The organic EL element according to claim 7 ,
wherein a thickness of the silver thin film layer is 10 to 20 nm.
9. The organic EL element according to claim 7 ,
wherein the ground layer is an organic layer.
10. The organic EL element according to claim 7 ,
wherein the light-transmitting second electrode is a cathode, and the ground layer is an electron injection layer or an electron transport layer.
11. The organic EL element according to claim 7 ,
wherein a material for the ground layer is selected from indium tin oxide and indium zinc oxide.
12. The organic EL element according to claim 11 ,
wherein a region surrounded by a surface on a light emitting layer side of the first electrode and an interface between the ground layer and the light-transmitting second electrode constitutes an optical resonator having the surface and the interface as reflective surfaces.
13. An organic EL display panel, comprising:
an organic EL element including:
a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode stacked in this order over a substrate,
wherein the ground layer is light-transmitting and electrically conductive, and its surface on which the light-transmitting second electrode is stacked has a surface roughness of 0.3 to 2.7 nm, and
the light-transmitting second electrode is a silver thin film layer formed of silver or containing silver as a main constituent.
14. An organic EL display panel, comprising:
an organic EL element including
a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode stacked in this order over a substrate,
wherein the ground layer is light-transmitting and electrically conductive, and its surface on which the light-transmitting second electrode is stacked has a surface free energy of 33 to 97 mJ/m 2 , and
the light-transmitting second electrode is a silver thin film layer formed of silver or containing silver as a main constituent.
15. A method of manufacturing an organic EL display panel, the method comprising:
stacking a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode in this order over a substrate,
wherein the ground layer is formed from a light-transmitting and electrically conductive material, and its surface on which the light-transmitting second electrode is stacked has a surface roughness of 0.3 to 2.7 nm, and
the light-transmitting second electrode includes a silver thin film layer formed of silver or containing silver as a main constituent.
16. The method of manufacturing the organic EL display panel according to claim 15 ,
wherein a film thickness of the silver thin film layer is 10 to 20 nm.
17. A method of manufacturing an organic EL display panel, the method comprising:
stacking a first electrode, a light emitting layer, a ground layer, and a light-transmitting second electrode in this order over a substrate,
wherein the ground layer is formed from a light-transmitting and electrically conductive material, and its surface on which the light-transmitting second electrode is stacked has a surface free energy of 33 to 97 mJ/m 2 , and
the light-transmitting second electrode includes a silver thin film layer formed of silver or containing silver as a main constituent.
18. The method of manufacturing the organic EL display panel according to claim 17 ,
wherein a film thickness of the silver thin film layer is 10 to 20 nm.