Light-emitting apparatus including photoluminescent layer
First Claim
1. A light-emitting apparatus comprising a photoluminescent layer that emits light in response to excitation light and has a light-emitting surface, the light from the photoluminescent layer being emitted through the light-emitting surface,wherein the light-emitting surface includes a first region and a second region,the light from the photoluminescent layer includes first light having a wavelength λ
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a in air,the first light emitted through the first region has a smaller directional angle than the first light emitted through the second region,the photoluminescent layer has a periodic structure in the first region, the periodic structure having projections or recesses or both, anda refractive index nwav-a of the photoluminescent layer for the first light and a period pa of the periodic structure satisfy λ
a/nwav-a<
pa<
λ
a.
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Accused Products
Abstract
A light-emitting apparatus comprising a photoluminescent layer that emits light in response to excitation light and has a light-emitting surface, the light from the photoluminescent layer being emitted through the light-emitting surface. The light-emitting surface includes a first region and a second region. The light from the photoluminescent layer includes first light having a wavelength λa in air. The first light emitted through the first region has a smaller directional angle than the first light emitted through the second region.
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Citations
14 Claims
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1. A light-emitting apparatus comprising a photoluminescent layer that emits light in response to excitation light and has a light-emitting surface, the light from the photoluminescent layer being emitted through the light-emitting surface,
wherein the light-emitting surface includes a first region and a second region, the light from the photoluminescent layer includes first light having a wavelength λ -
a in air,
the first light emitted through the first region has a smaller directional angle than the first light emitted through the second region, the photoluminescent layer has a periodic structure in the first region, the periodic structure having projections or recesses or both, and a refractive index nwav-a of the photoluminescent layer for the first light and a period pa of the periodic structure satisfy λ
a/nwav-a<
pa<
λ
a. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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a in air,
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11. A light-emitting apparatus comprising:
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a photoluminescent layer that emits light in response to excitation light; and a light transmissive layer that is located on the photoluminescent layer, wherein at least one of the photoluminescent layer and the light transmissive layer has a light-emitting surface, the light from the photoluminescent layer being emitted through the light-emitting surface, wherein the light-emitting surface includes a first region and a second region, the light from the photoluminescent layer includes first light having a wavelength λ
a in air,the first light emitted through the first region has a smaller directional angle than the first light emitted through the second region, the light-emitting surface is a surface of the light-transmissive layer, the light-transmissive layer has a periodic structure in the first region, the periodic structure having projections or recesses or both, and a refractive index nwav-a of the photoluminescent layer for the first light and a period pa of the periodic structure satisfy λ
aλ
nwav-a<
pa<
λ
a. - View Dependent Claims (12, 13)
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Specification