Light-emitting apparatus including photoluminescent layer
First Claim
Patent Images
1. A light-emitting apparatus comprising:
- a light-emitting device including a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λ
a in air, and a light-transmissive layer located on or near the photoluminescent layer; and
an optical fiber that receives the light from the photoluminescent layer at one end of the optical fiber and emits the received light from the other end thereof,wherein a surface structure is defined on at least one of the photoluminescent layer and the light-transmissive layer, andthe surface structure has projections or recesses or both with a shorter period than the wavelength λ
a and limits a directional angle of the first light having the wavelength λ
a in air.
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Abstract
A light-emitting apparatus includes; a light-emitting device including a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λa in air, and a light-transmissive layer located on or near the photoluminescent layer; and an optical fiber that receives the light from the photoluminescent layer at one end of the optical fiber and emits the received light from the other end thereof. A surface structure is defined on at least one of the photoluminescent layer and the light-transmissive layer, and the surface structure has projections or recesses or both and limits a directional angle of the first light having the wavelength λa in air.
76 Citations
31 Claims
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1. A light-emitting apparatus comprising:
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a light-emitting device including a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λ
a in air, and a light-transmissive layer located on or near the photoluminescent layer; andan optical fiber that receives the light from the photoluminescent layer at one end of the optical fiber and emits the received light from the other end thereof, wherein a surface structure is defined on at least one of the photoluminescent layer and the light-transmissive layer, and the surface structure has projections or recesses or both with a shorter period than the wavelength λ
a and limits a directional angle of the first light having the wavelength λ
a in air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A light-emitting apparatus comprising:
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an excitation light source that outputs excitation light; an optical fiber that receives the excitation light from the excitation light source at one end of the optical fiber and emits the received excitation light from the other end thereof; and a light emitting device including a photoluminescent layer that receives the excitation light emitted from the optical fiber and emits light including first light having a wavelength λ
a in air, and a light-transmissive layer located on or near the photoluminescent layer,wherein a surface structure is defined on at least one of the photoluminescent layer and the light-transmissive layer, and the surface structure has projections or recesses or both with a shorter period than the wavelength λ
a and limits a directional angle of the first light having the wavelength λ
a in air. - View Dependent Claims (19, 20, 21)
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22. A light-emitting apparatus comprising:
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a light-emitting device including a light-transmissive layer and a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λ
a in air; andat least one of (a) a first optical fiber that receives the light from the photoluminescent layer at one end of the first optical fiber and emits the received light from the other end thereof and (b) a second optical fiber that receives the excitation light from an excitation light source at one end of the second optical fiber and emits the received excitation light from the other end thereof toward the light-emitting device, wherein a surface structure is defined on the light-transmissive layer, the photoluminescent layer is located on or near the surface structure, and the surface structure has projections or recesses or both with a shorter period than the wavelength λ
a and limits a directional angle of the first light having the wavelength λ
a in air. - View Dependent Claims (23, 24, 25)
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26. A light-emitting apparatus comprising:
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a light-emitting device including a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λ
a in air, and a light-transmissive layer having a higher refractive index for the first light than the photoluminescent layer; andat least one of (a) a first optical fiber that receives the light from the photoluminescent layer at one end of the first optical fiber and emits the received light from the other end thereof and (b) a second optical fiber that receives the excitation light from an excitation light source at one end of the second optical fiber and emits the received excitation light from the other end thereof toward the light-emitting device, wherein a surface structure is defined on the light-transmissive layer, and the surface structure has projections or recesses or both with a shorter period than the wavelength λ
a and limits a directional angle of the first light having the wavelength λ
a in air. - View Dependent Claims (27, 29)
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28. A light-emitting apparatus comprising:
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a light-emitting device including a photoluminescent layer that receives excitation light and emits light including first light having a wavelength λ
a in air; andat least one of (a) a first optical fiber that receives the light from the photo luminescent layer at one end of the first optical fiber and emits the received light from the other end thereof and (b) a second optical fiber that receives the excitation light from an excitation light source at one end of the second optical fiber and emits the received excitation light from the other end thereof toward the light-emitting device, wherein a surface structure is defined on the photoluminescent layer, and the surface structure has projections or recesses or both with a shorter period than the wavelength λ
a and limits a directional angle of the first light having the wavelength λ
a in air. - View Dependent Claims (30, 31)
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Specification