| CPC H10H 20/855 (2025.01) [G02B 5/0278 (2013.01); H10H 20/831 (2025.01); H10H 20/857 (2025.01)] | 18 Claims |
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1. A light-emitting device comprising:
a substrate;
a wiring formed in the substrate;
a light-emitting element including an electrode electrically connected to the wiring, and configured to emit light having a main wavelength in a range from 500 nm to 560 nm; and
a diffusion member disposed on a light-emitting surface side of the light-emitting element on a side opposite to a surface on which the electrode is formed, wherein
a first direction parallel to one side of the diffusion member and a second direction orthogonal to the first direction are defined when the diffusion member is viewed in plan view,
a first measurement plane is defined as a plane passing through a center of an outer shape of the diffusion member when viewed in plan view, parallel to the first direction, and perpendicular to a light emission surface of the diffusion member, and
a second measurement plane is defined as a plane passing through the center of the outer shape, parallel to the second direction, and perpendicular to the light emission surface of the diffusion member,
when chromaticity x and chromaticity y of an emission color of the light-emitting device are measured in each of the first measurement plane and the second measurement plane in a range in which an angle at the center of the outer shape is in a range from −60° to 60° with reference to a perpendicular line passing through the center of the outer shape, being orthogonal to the light emission surface, and extending in a light emission observation direction,
an average value α of a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the first measurement plane and a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the second measurement plane is less than 0.0024.
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