Layered, light-emitting element
View Patent ↗A light-emitting element is provided having a layered structure composed of at least a light-emitting layer having a light-emitting region and a reflective layer for reflecting light emitted from the light-emitting region. Light emitted from the light-emitting region is extracted from a light-extracting surface distanced from the light-emitting region. A light-scattering portion is present in a part of the reflective layer.
1. A light-emitting element having a layered structure, the layered structure comprising at least a light-emitting layer having a light-emitting region, the light-emitting element comprising,
a layer with a refractive index of approximately 1, wherein
a distance between a surface of the light-emitting region facing a side of the layer with a refractive index of approximately 1 and a surface of the layer with a refractive index of approximately 1 facing a side of the light-emitting region, is limited to 50% or less of a peak wavelength of light.
2. The light-emitting element according to claim 1 , wherein on a substrate, a light reflective first electrode layer, the light-emitting layer, a transparent second electrode layer, and the layer with a refractive index of approximately 1 are provided in this order.
3. The light-emitting element according to claim 2 , wherein a passivation layer is formed on the layer with a refractive index of approximately 1.
4. The light-emitting element according to claim 1 , wherein on a substrate, a reflective layer, a first transparent electrode layer, the light-emitting layer, a second transparent electrode layer, and the layer with a refractive index of approximately 1 are provided in this order.
5. The light-emitting element according to claim 4 , wherein a passivation layer is formed on the layer with a refractive index of approximately 1.
6. The light-emitting element according to claim 1 , wherein the distance is limited to 30% or less of the peak wavelength of light.
7. The light-emitting element according to claim 2 , wherein the distance is limited to 30% or less of the peak wavelength of light.
8. The light-emitting element according to claim 3 , wherein the distance is limited to 30% or less of the peak wavelength of light.
9. The light-emitting element according to claim 4 , wherein the distance is limited to 30% or less of the peak wavelength of light.
10. The light-emitting element according to claim 5 , wherein the distance is limited to 30% or less of the peak wavelength of light.
11. The light-emitting element according to claim 1 , wherein the distance is limited to 20% or less of the peak wavelength of light.
12. The light-emitting element according to claim 2 , wherein the distance is limited to 20% or less of the peak wavelength of light.
13. The light-emitting element according to claim 3 , wherein the distance is limited to 20% or less of the peak wavelength of light.
14. The light-emitting element according to claim 4 , wherein the distance is limited to 20% or less of the peak wavelength of light.
15. The light-emitting element according to claim 5 , wherein the distance is limited to 20% or less of the peak wavelength of light.
16. The light-emitting element according to claim 1 , wherein the distance is limited to 10% or less of the peak wavelength of light.
17. The light-emitting element according to claim 2 , wherein the distance is limited to 10% or less of the peak wavelength of light.
18. The light-emitting element according to claim 3 , wherein the distance is limited to 10% or less of the peak wavelength of light.
19. The light-emitting element according to claim 4 , wherein the distance is limited to 10% or less of the peak wavelength of light.
20. The light-emitting element according to claim 5 , wherein the distance is limited to 10% or less of the peak wavelength of light.
21. The light-emitting element according to claim 1 , wherein a distance t between a reflective layer and an interface is 500 μm or less.
22. The light-emitting element according to claim 2 , wherein a distance t between a reflective layer and an interface is 500 μm or less.
23. The light-emitting element according to claim 3 , wherein a distance t between a reflective layer and an interface is 500 μm or less.
24. The light-emitting element according to claim 4 , wherein a distance t between the reflective layer and an interface is 500 μm or less.
25. The light-emitting element according to claim 5 , wherein a distance t between the reflective layer and an interface is 500 μm or less.
26. The light-emitting element according to claim 1 , wherein the light-emitting element comprises a light-scattering portion, and the light-emitting element is for extracting light from a light-extracting surface distanced from the light-emitting region, the light being emitted from the light-emitting region.
27. The light-emitting element according to claim 26 , wherein on a substrate, a light reflective first electrode layer, the light-emitting layer, a transparent second electrode layer, and the layer with a refractive index of approximately 1 are provided in this order.
28. The light-emitting element according to claim 27 , wherein a passivation layer is formed on the layer with a refractive index of approximately 1.
29. The light-emitting element according to claim 26 , wherein on a substrate, a reflective layer, a first transparent electrode layer, the light-emitting layer, a second transparent electrode layer, and the layer with a refractive index of approximately 1 are provided in this order.
30. The light-emitting element according to claim 29 , wherein a passivation layer is formed on the layer with a refractive index of approximately 1.
31. The light-emitting element according to claim 26 , wherein the distance is limited to 30% or less of the peak wavelength of light.
32. The light-emitting element according to claim 26 , wherein the distance is limited to 20% or less of the peak wavelength of light.
33. The light-emitting element according to claim 26 , wherein the distance is limited to 10% or less of the peak wavelength of light.
34. The light-emitting element according to claim 26 , wherein a distance t between a reflective layer and an interface is 500 μm or less.
35. The light-emitting element according to claim 26 , wherein the light-scattering portion corresponds to an irregular surface of a reflective layer.
36. The light-emitting element according to claim 26 , wherein the light-scattering portion corresponds to an irregular surface of the light-extracting surface.
37. The light-emitting element according to claim 35 , further comprising a planarizing layer for planarizing the irregular surface.
38. The light-emitting element according to claim 36 , further comprising a planarizing layer for planarizing the irregular surface.
39. The light-emitting element according to claim 36 , wherein a maximum value (R max ) of surface roughness of the irregular surface is ¼ or more of the peak wavelength of light.
40. The light-emitting element according to claim 26 , wherein the light-scattering portion is made of a base material and an additive to be dispersed in the base material, the base material and the additive having different refractive indices.
41. The light-emitting element according to claim 1 , further comprising a planarizing layer for planarizing the irregular surface.
42. The light-emitting element according to claim 26 , wherein an aerogel layer is used as the layer with a refractive index of approximately 1.
43. A display device comprising the light-emitting element in accordance with claim 1 .
44. A display device comprising the light-emitting element in accordance with claim 26 .
45. A lighting device comprising the light-emitting element in accordance with claim 1 .
46. A lighting device comprising the light-emitting element in accordance with claim 26 .