Light emitting element with improved layer thickness uniformity
A light-emitting element includes an anode, a cathode, a hole transporting layer provided between the anode and cathode, a light-emitting layer provided in contact with the hole transporting layer between the anode and cathode, where the surface of the light-emitting layer side of the hole transporting layer is formed in a shape having a part in which the distance with the reference surface along the anode changes in a continuous or step-wise manner, and the surface of the opposite side to the hole transporting layer of the light-emitting layer is formed so as to have the same shape as the surface of the light-emitting layer of the hole transporting layer.
1. A light-emitting element, comprising:
a first electrode;
a second electrode;
a first layer provided between the first electrode and the second electrode;
a second layer provided in contact with the first layer between the first layer and the second electrode;
a reference surface of the first electrode that faces the first layer;
a first surface of the first layer that is in contact with the second layer, the first surface being formed having a part in which a distance between the first surface and the reference surface changes in a continuous or step-wise manner; and
a second surface of the second layer disposed on an opposite side of the second layer from the first layer, the second surface being formed so as to have a same shape as the first surface,
wherein in a first region covering at least 90% of the second layer in a width direction of the second layer, a difference between the distance between the first surface and the reference surface and a distance between the second surface and the reference surface is within a range of ±10% with respect to an average value of the difference within the first region.
2. The light-emitting element according to claim 1 ,
wherein the second layer has a long shape when viewed in a direction in which the first electrode and the second electrode overlap, and
in a second region covering at least 90% of the second layer in a length direction of the second layer, a difference between the distance between the first surface and the reference surface and the distance between the second surface and the reference surface is within a range of ±10% with respect to an average value of the difference within the second region.
3. A light-emitting device comprising the light-emitting element according to claim 2 .
4. An electronic apparatus comprising the light-emitting element according to claim 2 .
5. The light-emitting element according to claim 1 ,
wherein the first electrode is an anode,
the second electrode is a cathode,
the first layer is a hole injection layer or a hole transporting layer; and
the second layer is a light-emitting layer.
6. A light-emitting device comprising the light-emitting element according to claim 5 .
7. An electronic apparatus comprising the light-emitting element according to claim 5 .
8. A light-emitting device comprising the light-emitting element according to claim 1 .
9. An electronic apparatus comprising the light-emitting element according to claim 1 .
10. A method of manufacturing the light-emitting element according to claim 1 , comprising:
forming the first electrode;
forming the first layer using a liquid phase process on the reference surface of the first electrode;
forming the second layer using a liquid phase process on the first layer such that the second surface has the same shape as the first surface; and
forming a the second electrode on the opposite side of the second layer from the first layer.
11. The method of manufacturing the light-emitting element according to claim 10 ,
wherein the first layer and the second layer are formed in a same divided bank.
12. The method of manufacturing the light-emitting element according to claim 11 ,
wherein the forming of the second layer is performed by fixing after applying a liquid including a material that configures the second layer or a precursor thereof on the first layer; and
in the forming of the second layer, a contact angle of the precursor with respect to the first layer is equal to or smaller than a contact angle of the precursor with respect to the bank.
13. The method of manufacturing the light-emitting element according to claim 12 ,
wherein B/A is 0.003 ng/μm 2 or more and 0.006 ng/μm 2 or less when an area in plan view in the bank is A [μm 2 ] and an amount of liquid applied on the first layer when forming the second layer is B[ng].
14. The method of manufacturing the light-emitting element according to claim 12 ,
wherein drying is performed by reducing pressure from normal pressure to 5 Pa within 5 minutes after applying the precursor on the first layer.