Light-emitting device and lighting device
View Patent ↗It is an object to improve light extraction efficiency in a light-emitting device and a lighting device. A light-emitting device includes a plurality of light-emitting portions, and a plurality of hemispherical components provided so as to overlap with the plurality of light-emitting portions. The plurality of hemispherical components are provided so as not to form a space therebetween in a region where the plurality of hemispherical components are adjacent to each other. When a refractive index of the hemispherical component is n and a radius of a bottom surface of the hemispherical component is b, the light-emitting portion is provided inside a circle whose radius r from a center of the bottom surface of the hemispherical component is b/n.
1. A light-emitting device comprising:
a plurality of light-emitting portions, each of the plurality of light-emitting portions comprising first and second electrodes and a light-emitting layer interposed therebetween; and
a plurality of hemispherical components, each of the plurality of hemispherical components having a flat surface on which the first electrode is provided,
wherein the plurality of hemispherical components are provided so as not to form a space therebetween in a region where the plurality of hemispherical components are adjacent to each other, and
wherein a refractive index of each of the plurality of the hemispherical components is greater than or equal to a refractive index of the light-emitting layer.
2. The light-emitting device according to claim 1 , further comprising:
a plate-like component,
wherein the plurality of light-emitting portions are provided over one surface of the plate-like component, and
wherein flat surfaces of the plurality of hemispherical components are provided over the other surface of the plate-like component.
3. The light-emitting device according to claim 2 ,
wherein the plate-like component comprises glass, and
wherein each of the plurality of hemispherical components comprises resin.
4. A lighting device comprising the light-emitting device according to claim 1 .
5. A light-emitting device comprising:
a plurality of light-emitting portions on a first surface of a plate-like component, each of the plurality of light-emitting portions comprising first and second electrodes and a light-emitting layer interposed therebetween; and
a plurality of hemispherical components on a second surface of the plate-like component, each of the plurality of hemispherical components having a flat surface in contact with he second surface of the plate-like component,
wherein the plurality of hemispherical components are arranged with a closest packed structure.
6. The light-emitting device according to claim 5 ,
wherein the refractive index of each of the plurality of hemispherical components is greater than or equal to a refractive index of the plate-like component, and the refractive index of the plate-like component is greater than or equal to a refractive index of the light-emitting layer.
7. The light-emitting device according to claim 5 ,
wherein the plate-like component comprises glass, and
wherein each of the plurality of hemispherical components comprises resin.
8. A lighting device comprising the light-emitting device according to claim 5 .
9. A light-emitting device comprising:
a light-emitting portion comprising first and second electrodes and a light-emitting layer interposed therebetween; and
a hemispherical component having a flat surface;
a plate-like component between the first electrode of the light-emitting portion and the flat surface of the hemispherical component,
wherein a refractive index of the hemispherical component is n and a radius of the flat surface of the hemispherical component is b, and
wherein the light-emitting portion is provided inside a circle whose radius r from a center of the flat surface of the hemispherical component is b/n.
10. The light-emitting device according to claim 9 ,
wherein the refractive index of the hemispherical components is greater than or equal to a refractive index of the plate-like component, and the refractive index of the plate-like component is greater than or equal to a refractive index of the light-emitting layer.
11. The light-emitting device according to claim 9 ,
wherein the plate-like component comprises glass, and
wherein the hemispherical component comprises resin.
12. A lighting device comprising the light-emitting device according to claim 9 .
13. A light-emitting device comprising:
a plurality of light-emitting portions, each of the plurality of light-emitting portions comprising first and second electrodes and a light-emitting layer interposed therebetween; and
a plurality of hemispherical components, each of the plurality of hemispherical components having a flat surface on which each of the plurality of light-emitting portions is provided,
wherein a refractive index of each of the plurality of hemispherical components is n and a radius of the flat surface of each of the plurality of hemispherical components is b,
wherein each of the plurality of light-emitting portions is provided inside a circle whose radius r from a center of the flat surface of each of the plurality of hemispherical components is b/n, and
wherein the refractive index of each of the plurality of hemispherical components is greater than or equal to a refractive index of the light-emitting layer.
14. The light-emitting device according to claim 13 , wherein the plurality of hemispherical components are arranged with a closest packed structure.
15. A lighting device comprising the light-emitting device according to claim 13 .
16. A light-emitting device comprising:
a plate-like component;
a plurality of light-emitting portions provided on a first surface of the plate-like component, each of the plurality of light-emitting portions comprising first and second electrodes and a light-emitting layer interposed therebetween; and
a plurality of hemispherical components on a second surface of the plate-like component, each of the plurality of hemispherical components having a flat surface in contact with the second surface of the plate-like component interposed therebetween,
wherein a refractive index of each of the plurality of hemispherical components is n and a radius of a bottom surface of each of the plurality of hemispherical components is b, and
wherein each of the plurality of light-emitting portions is provided inside a circle whose radius r from a center of the bottom surface of each of the plurality of hemispherical components is b/n.
17. The light-emitting device according to claim 16 ,
wherein the plate-like component comprises glass, and
wherein each of the plurality of hemispherical components comprises resin.
18. The light-emitting device according to claim 16 , wherein the plurality of hemispherical components are arranged with a closest packed structure.
19. A lighting device comprising the light-emitting device according to claim 16 .
20. The light-emitting device according to claim 16 , wherein the refractive index of each of the plurality of hemispherical components is greater than or equal to a refractive index of the plate-like component, and the refractive index of the plate-like component is greater than or equal to a refractive index of the light-emitting layer.