Organic electroluminescent element, organic electroluminescent panel, and luminescent unit comprising a film thickness adjustment layer positioned outside of a resonator
An organic electroluminescent element includes an organic electroluminescent part and a pair of partition walls. The organic electroluminescent part includes an organic material layer, a resonator, and a film-thickness adjustment layer. The film-thickness adjustment layer has a thickness that is adjusted to allow a difference between a height of a pinning position and a height of a middle position of an upper surface of the organic material layer to fall within a predetermined range. The pinning position is a position at which the upper surface of the organic material layer and each of the partition walls are in contact with each other.
1. An organic electroluminescent element comprising:
an organic electroluminescent part; and
a pair of partition walls provided on both sides of the organic electroluminescent part,
the organic electroluminescent part including
an organic material layer including a light-emitting layer that emits electroluminescence light,
a resonator that is in contact with the organic material layer, and includes an anode-side reflecting surface and a cathode-side reflecting surface that face each other with the organic material layer provided therebetween, and
a film-thickness adjustment layer provided at a position that is outside of the resonator and closer to the anode-side reflecting surface, and having a thickness that is adjusted to allow a difference between a height of a pinning position and a height of a middle position of an upper surface of the organic material layer to fall within a predetermined range, the pinning position being a position at which the upper surface of the organic material layer and each of the partition walls are in contact with each other.
2. The organic electroluminescent element according to claim 1 , wherein the difference is equal to or smaller than 500 nm.
3. The organic electroluminescent element according to claim 1 , wherein
at least a part of an edge of the film-thickness adjustment layer is located below each of the partition walls,
the partition walls each have a step that follows the edge of the film-thickness adjustment layer, and
the step is smaller than the thickness of the film-thickness adjustment layer.
4. The organic electroluminescent element according to claim 1 , wherein
the organic electroluminescent part includes an anode electrode having the anode-side reflecting surface,
the anode electrode is in contact with a surface of the film-thickness adjustment layer and provided to allow an edge of the anode electrode to be located above an edge of the film-thickness adjustment layer,
at least a part of the edge of the film-thickness adjustment layer and at least a part of the edge of the anode electrode are located below each of the partition walls,
the partition walls each have a step that follows the edge of the film-thickness adjustment layer and the edge of the anode electrode, and
the step is smaller than a sum of the thickness of the film-thickness adjustment layer and a thickness of the anode electrode.
5. The organic electroluminescent element according to claim 1 , wherein
the organic electroluminescent part includes an anode electrode having the anode-side reflecting surface, and
the anode electrode serves as the film-thickness adjustment layer.
6. The organic electroluminescent element according to claim 1 , wherein
the organic electroluminescent part includes an anode electrode having the anode-side reflecting surface, and
the film-thickness adjustment layer comprises an insulating layer that is in contact with the anode electrode.
7. The organic electroluminescent element according to claim 1 , wherein
the partition walls each include a first partition wall and a second partition wall stacked on the first partition wall,
the organic material layer includes, in addition to the light-emitting layer, one or more first organic material layers provided closer to the anode-side reflecting surface and one or more second organic material layers closer provided to the cathode-side reflecting surface,
the first partition wall has a pinning position at which an upper surface of the first organic material layer and the first partition wall are in contact with each other, and
the second partition wall has a pinning position at which an upper surface of the second organic material layer and the second partition wall are in contact with each other.
8. An organic electroluminescent panel comprising
a plurality of pixels each including a plurality of subpixels,
in each of the pixels, at least one of the subpixels including
an organic electroluminescent part, and
a pair of partition walls provided on both sides of the organic electroluminescent part,
the organic electroluminescent part including
an organic material layer including a light-emitting layer that emits electroluminescence light,
a resonator that is in contact with the organic material layer, and includes an anode-side reflecting surface and a cathode-side reflecting surface that face each other with the organic material layer provided therebetween, and
a film-thickness adjustment layer provided at a position that is outside of the resonator and closer to the anode-side reflecting surface, and having a thickness that is adjusted to allow a difference between a height of a pinning position and a height of a middle position of an upper surface of the organic material layer to fall within a predetermined range, the pinning position being a position at which the upper surface of the organic material layer and each of the partition walls are in contact with each other.
9. The organic electroluminescent panel according to claim 8 ,
wherein, in each of the pixels, at least two of the subpixels each include the organic electroluminescent part and the pair of partition walls, and
wherein, in each of the pixels, the thickness of the film-thickness adjustment layer of a first subpixel in the subpixels and the thickness of the film-thickness adjustment layer of a second subpixel, different from the first subpixel, in the subpixels satisfy the following relational expression:
t1<t2
where t 1 is the thickness of the film-thickness adjustment layer of the first subpixel, and t 2 is the thickness of the film-thickness adjustment layer of the second subpixel.
10. The organic electroluminescent panel according to claim 9 , wherein, in each of the pixels, a thickness of the organic material layer of the first subpixel and a thickness of the organic material layer of the second subpixel satisfy the following relational expression:
t3>t4
where t 3 is the thickness of the organic material layer of the first subpixel, and t 4 is the thickness of the organic material layer of the second subpixel.
11. The organic electroluminescent panel according to claim 8 , wherein, in each of the pixels, the difference of the first subpixel and the difference of the second subpixel are each equal or smaller than 500 nm.
12. A luminescent unit comprising:
an organic electroluminescent panel including a plurality of pixels; and
a driver that drives the plurality of pixels,
the plurality of pixels each including a plurality of subpixels,
in each of the pixels, at least one of the subpixels including
an organic electroluminescent part, and
a pair of partition walls provided on both sides of the organic electroluminescent part,
the organic electroluminescent part including
an organic material layer including a light-emitting layer that emits electroluminescence light,
a resonator that is in contact with the organic material layer, and includes an anode-side reflecting surface and a cathode-side reflecting surface that face each other with the organic material layer provided therebetween, and
a film-thickness adjustment layer provided at a position that is outside of the resonator and closer to the anode-side reflecting surface, and having a thickness that is adjusted to allow a difference between a height of a pinning position and a height of a middle position of an upper surface of the organic material layer to fall within a predetermined range, the pinning position being a position at which the upper surface of the organic material layer and each of the partition walls are in contact with each other.