Light-emitting device and lighting device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHisao Ikeda, Takuya Kawata
Life of this patent
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Abstract
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.
Claims16
A light-emitting device comprising:
- a substrate;
- a first electrode over the substrate;
- a light-emitting layer over the first electrode;
- a second electrode over the light-emitting layer;
- and
- a hemispherical component on and in contact with the second electrode, an edge of the hemispherical component aligned with an edge of the second electrode,
- wherein a refractive index of the hemispherical component is greater than or equal to a refractive index of the light-emitting layer, and
- wherein an area of a bottom surface of the hemispherical component is larger than an area of the first electrode.
A light-emitting device comprising:
- a substrate;
- a plurality of first electrodes over a first surface of the substrate;
- a light-emitting layer over the plurality of first electrodes;
- and
- a second electrode layer over the light-emitting layer;
- and
- a plurality of hemispherical components on and in contact with the second electrode layer, each of the plurality of hemispherical components overlapping with each of the plurality of first electrodes,
- wherein an area of a bottom surface of each of the plurality of hemispherical components is larger than an area of each of the plurality of first electrodes.
A light-emitting device comprising:
- a substrate;
- a first electrode over the substrate;
- a light-emitting layer over the first electrode;
- a second electrode over the light-emitting layer;
- and
- a hemispherical component on and in contact with the second electrode, an edge of the hemispherical component aligned with an edge of the second electrode,
- wherein an area of a bottom surface of the hemispherical component is larger than an area of the first electrode,
- wherein a refractive index of the hemispherical component is n and a radius of a region of the substrate which is covered by the hemispherical component is b, and
- wherein the light-emitting layer is provided inside a circle whose radius r from a center of the region of the substrate is b/n.
Dependencies are inferred from the claim text.