Light-emitting apparatus
First Claim
1. A light-emitting apparatus comprising:
- an excitation light source that emits first light;
a light-emitting device on an optical path of the first light, the light-emitting device emitting second light having a wavelength λ
a in air; and
a first converging lens on an optical path of the second light, wherein;
the light-emitting device comprises;
a photoluminescent layer that emits the second light by being excited by the first light; and
a light-transmissive layer on the photoluminescent layer,at least one of the photoluminescent layer and the light-transmissive layer has a surface structure comprising projections or recesses arranged perpendicular to a thickness direction of the photo luminescent layer,the surface structure is entirely made of a light-transmissive dielectric material,at least one of the photoluminescent layer and the light-transmissive layer has a light emitting surface perpendicular to the thickness direction, the second light emitted from the light emitting surface,the surface structure limits the directional angle of the second light emitted from the light emitting surface,the photoluminescent layer comprises a dielectric layer, andthe light-transmissive dielectric material is continuously formed from the dielectric layer by a same material as the dielectric layer so that the surface structure is formed as a part of the photoluminescent layer.
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Accused Products
Abstract
A light-emitting apparatus includes an excitation light source that emits first light; a light-emitting device on an optical path of the first light, the light-emitting device emitting second light having a wavelength in air; and a first converging lens on an optical path of the second light. The light-emitting device comprises: a photoluminescent layer that emits the second light by being excited by the first light; and a light-transmissive layer on the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a surface structure comprising projections or recesses arranged perpendicular to a thickness direction of the photoluminescent layer. At least one of the photoluminescent layer and the light-transmissive layer has a light emitting surface perpendicular to the thickness direction, the second light emitted from the light emitting surface. The surface structure limits the directional angle of the second light emittied from the light emitting surface.
79 Citations
12 Claims
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1. A light-emitting apparatus comprising:
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an excitation light source that emits first light; a light-emitting device on an optical path of the first light, the light-emitting device emitting second light having a wavelength λ
a in air; anda first converging lens on an optical path of the second light, wherein; the light-emitting device comprises; a photoluminescent layer that emits the second light by being excited by the first light; and a light-transmissive layer on the photoluminescent layer, at least one of the photoluminescent layer and the light-transmissive layer has a surface structure comprising projections or recesses arranged perpendicular to a thickness direction of the photo luminescent layer, the surface structure is entirely made of a light-transmissive dielectric material, at least one of the photoluminescent layer and the light-transmissive layer has a light emitting surface perpendicular to the thickness direction, the second light emitted from the light emitting surface, the surface structure limits the directional angle of the second light emitted from the light emitting surface, the photoluminescent layer comprises a dielectric layer, and the light-transmissive dielectric material is continuously formed from the dielectric layer by a same material as the dielectric layer so that the surface structure is formed as a part of the photoluminescent layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification