Light-emitting device including concavo-convex boundary pattern
View Patent ↗A light-emitting device includes: a light-emitting layer; a first layer located on a light-emitting side of the light-emitting layer; and a second layer located on a light-emitting side of the first layer, and in contact with the first layer. A concavo-convex structure composed of a plurality of convex portions having two or more steps is formed at a boundary between the first layer and the second layer, a refractive index of the first layer is higher than a refractive index of the second layer, and a concavo-convex pattern of the concavo-convex structure is a pattern formed by a space-filling curve or a fractal tiling pattern.
1. A light-emitting device comprising:
a light-emitting layer;
a first layer located on a light-emitting side of the light-emitting layer; and
a second layer located on a light-emitting side of the first layer, and in contact with the first layer,
wherein a boundary between the first layer and the second layer includes a concavo-convex structure composed of a plurality of convex portions having two or more steps,
a refractive index of the first layer is higher than a refractive index of the second layer, and
a concavo-convex pattern of the concavo-convex structure is a pattern formed by a space-filling curve.
2. The light-emitting device according to claim 1 ,
wherein the space-filling curve is a Hilbert curve.
3. The light-emitting device according to claim 1 ,
wherein the space-filling curve is a Peano curve.
4. A light-emitting device comprising:
a light-emitting layer;
a first layer located on a light-emitting side of the light-emitting layer; and
a second layer located on a light-emitting side of the first layer, and in contact with the first layer,
wherein a boundary between the first layer and the second layer includes a concavo-convex structure composed of a plurality of convex portions having two or more steps,
a refractive index of the first layer is higher than a refractive index of the second layer, and
a concavo-convex pattern of the concavo-convex structure is a fractal tiling pattern.
5. The light-emitting device according to claim 4 ,
wherein the concavo-convex pattern is a pattern obtained by assigning, when the concavo-convex pattern is divided into virtual unit regions with no gap, a randomly rotated predetermined unit pattern to each of the virtual unit regions, the virtual unit regions each being a square, and
a contour representing the steps in the predetermined unit pattern has a rotationally symmetrical shape, and is composed of: a first line connecting respective center parts of one pair of two adjacent sides, of the four sides of the square; and a second line connecting respective center parts of the other pair of two adjacent sides, of the four sides of the square.
6. The light-emitting device according to claim 5 ,
wherein the first line and the second line are arc-shaped.
7. The light-emitting device according to claim 1 ,
wherein all of the plurality of convex portions have two or more steps.
8. The light-emitting device according to claim 1 ,
wherein the light-emitting layer is an organic electroluminescent (EL) layer.
9. The light-emitting device according to claim 1 , wherein the light-emitting device is a bottom emission type device.
10. The light-emitting device according to claim 1 , wherein the light-emitting device is a top emission type device.
11. The light-emitting device according to claim 4 , wherein the light-emitting device is a bottom emission type device.
12. The light-emitting device according to claim 4 , wherein the light-emitting device is a top emission type device.
13. The light-emitting device according to claim 1 , wherein the space filling curve is a Moore version of a Hilbert curve.
14. The light-emitting device according to claim 1 , where the space filling curve is a switchback type Peano curve.
15. The light-emitting device according to claim 1 , wherein the space filling curve is a Sierpinski curve.