Organic EL element including EL layer and insulating layer between electrodes
View Patent ↗An organic EL element including: first and second electrode layers; an organic EL layer located therebetween and including a light-emitting layer; an insulating layer extending between the electrode layers at least in a region where the organic EL layer is not present; and a sealing layer located on the other side of the second electrode layer from the organic EL layer, the sealing layer covering at least the organic EL layer. The insulating layer includes first and second sections provided between the electrode layers. The second section is thicker than the first section and not closer to the organic EL layer. At least a part of the second section is not covered by the sealing layer. The first section is entirely covered by the sealing layer. The insulating layer located between the electrode layers and not covered by the sealing layer is entirely included in the second section.
1. An organic EL element comprising:
a first electrode layer;
a second electrode layer;
an organic EL layer sandwiched between the first electrode layer and the second electrode layer, the organic EL layer including a light-emitting layer;
an insulating layer sandwiched between the first electrode layer and the second electrode layer at least in a region where the organic EL layer is not present in a plan view; and
a sealing layer located on the other side of the second electrode layer from the organic EL layer, the sealing layer covering, in the plan view, at least the organic EL layer, wherein:
the insulating layer includes a first section and a second section that overlap, in the plan view, with both of the first electrode layer and the second electrode layer, the second section being thicker than the first section in a cross sectional view, the first section being closer to the organic EL layer than the second section is;
in the plan view, at least a part of the second section is not covered by the sealing layer, an entire portion of the first section being covered by the sealing layer; and
an entire portion of the insulating layer that overlaps with both of the first electrode layer and the second electrode layer and is not covered, in the plan view, by the sealing layer is included in the second section.
2. The organic EL element according to claim 1 , wherein:
the first section includes a first flat portion having a flat surface on the second electrode side; and
the second section includes a second flat portion and a height difference portion, the second flat portion having a flat surface on the second electrode side, the height difference portion located between the first flat portion and the second flat portion in the plan view.
3. The organic EL element according to claim 1 , wherein:
the first electrode layer includes a substrate having an electroconductive surface; and
the insulating layer is in contact with the electroconductive surface.
4. The organic EL element according to claim 3 , wherein the first electrode layer includes a lower electrode located between the electroconductive surface and the organic EL layer.
5. The organic EL element according to claim 2 , wherein the sealing layer covers, in the plan view, a part of the height difference portion and an entire portion of the first flat portion.
6. The organic EL element according to claim 1 , wherein the second electrode layer includes an upper electrode and a lead-out electrode, the upper electrode being in contact with the organic EL layer, the lead-out electrode being electrically connected to the upper electrode and extending on the second section of the insulating layer.
7. The organic EL element according to claim 6 , wherein:
the lead-out electrode includes a first electrode section and a second electrode section in the plan view, the second electrode section being thinner than the first electrode section in the cross sectional view, the first electrode section located closer to the organic EL layer than the second electrode section is, and
in the plan view, at least a part of the second electrode section is not covered by the sealing layer, an entire portion of the first electrode section being covered by the sealing layer.
8. The organic EL element according to claim 6 , wherein under the sealing layer, the lead-out electrode includes a first electrode section and a second electrode section in the plan view, the second electrode section being thinner than the first electrode section in the cross sectional view, the second electrode section being located closer to the organic EL layer than the first electrode section is and being in contact with the organic EL layer.
9. The organic EL element according to claim 6 , wherein the lead-out electrode includes a bus bar electrode, the bus bar electrode being covered by the sealing layer and surrounding the organic EL layer in the plan view.
10. The organic EL element according to claim 1 , wherein:
the first electrode layer includes a first surface being in contact with the insulating layer;
the second electrode layer includes a second surface being in contact with the insulating layer; and
at least one of the first surface and the second surface contains a metallic material.
11. The organic EL element according to claim 1 , a periphery of the organic EL layer overlaps, in the plan view, with the first section of the insulating layer.
12. An organic EL element comprising:
a first electrode layer;
a second electrode layer;
an organic EL layer sandwiched between the first electrode layer and the second electrode layer, the organic EL layer including a light-emitting layer;
an insulating layer sandwiched between the first electrode layer and the second electrode layer at least in a region where the organic EL layer is not present in a plan view; and
a sealing layer partially covering, in the plan view, the second electrode layer thereby indirectly covering the organic EL layer and a part of the insulating layer, wherein:
the insulating layer includes a first section and a second section that overlap, in the plan view, with both of the first electrode layer and the second electrode layer, the second section being thicker than the first section in a cross sectional view, the first section being closer to the organic EL layer than the second section is;
in the plan view, at least a part of the second section is not covered by the sealing layer, an entire portion of the first section being covered by the sealing layer; and
an entire portion of the insulating layer that overlaps with both of the first electrode layer and the second electrode layer and is not covered, in the plan view, by the sealing layer is included in the second section.
13. The organic EL element according to claim 12 , wherein:
the first section includes a first flat portion having a flat surface on the second electrode side; and
the second section includes a second flat portion and a height difference portion, the second flat portion having a flat surface on the second electrode side, the height difference portion located between the first flat portion and the second flat portion in the plan view.
14. The organic EL element according to claim 12 , wherein:
the first electrode layer includes a substrate having an electroconductive surface; and
the insulating layer is in contact with the electroconductive surface.
15. The organic EL element according to claim 14 , wherein the first electrode layer includes a lower electrode located between the electroconductive surface and the organic EL layer.
16. The organic EL element according to claim 13 , wherein the sealing layer covers, in the plan view, a part of the height difference portion and an entire portion of the first flat portion.
17. The organic EL element according to claim 12 , wherein the second electrode layer includes an upper electrode and a lead-out electrode, the upper electrode being in contact with the organic EL layer, the lead-out electrode being electrically connected to the upper electrode and extending on the second section of the insulating layer.
18. The organic EL element according to claim 17 , wherein:
the lead-out electrode includes a first electrode section and a second electrode section in the plan view, the second electrode section being thinner than the first electrode section in the cross sectional view, the first electrode section located closer to the organic EL layer than the second electrode section is, and
in the plan view, at least a part of the second electrode section is not covered by the sealing layer, an entire portion of the first electrode section being covered by the sealing layer.
19. The organic EL element according to claim 17 , wherein under the sealing layer, the lead-out electrode includes a first electrode section and a second electrode section in the plan view, the second electrode section being thinner than the first electrode section in the cross sectional view, the second electrode section being located closer to the organic EL layer than the first electrode section is and being in contact with the organic EL layer.
20. The organic EL element according to claim 17 , wherein the lead-out electrode includes a bus bar electrode, the bus bar electrode being covered by the sealing layer and surrounding the organic EL layer in the plan view.