Illumination source including photoluminescent material and a filter, and an apparatus including same
First Claim
1. A illumination source comprising:
- a light emitting device;
at least one photoluminescent material layer that absorbs light emitted from the light emitting device and converts the wavelengths of at least a portion of the photons emitted from the light emitting device to longer wavelengths; and
at least one filter positioned between the light emitting device and the photoluminescent material layer, wherein the filter is substantially transmissive of light emitted by the light emitting device and substantially reflective of light emitted by the photoluminescent material layer.
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0 Petitions
Accused Products
Abstract
A illumination source comprising (i) a light emitting device, (ii) at least one photoluminescent material layer, and (iii) a filter between the light emitting device and the photoluminescent material layer. The light emitting device may comprise one or more LEDs, one or more lasers, one or more laser diodes, one or more lamps, or a combination of these things. The photoluminescent material layer may comprise quantum dot material and/or phosphors, and it may absorb light emitted from the light emitting device and convert the wavelengths of at least a portion of the photons emitted from the light emitting device to longer wavelengths. The filter may be substantially transmissive of light emitted by the light emitting device and substantially reflective of light emitted by the photoluminescent material layer, which may be omnidirectional. That way, light emitted from the light emitting device and the photoluminescent material layer may be directed in a common direction that is generally away from the light emitting device. The properties of the photoluminescent material layer may be chosen to achieve a desired emission spectra for the illumination source
68 Citations
36 Claims
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1. A illumination source comprising:
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a light emitting device;
at least one photoluminescent material layer that absorbs light emitted from the light emitting device and converts the wavelengths of at least a portion of the photons emitted from the light emitting device to longer wavelengths; and
at least one filter positioned between the light emitting device and the photoluminescent material layer, wherein the filter is substantially transmissive of light emitted by the light emitting device and substantially reflective of light emitted by the photoluminescent material layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A illumination source comprising:
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a light emitting device;
a first photoluminescent material layer that absorbs light emitted from the light emitting device and converts the wavelengths of at least a portion of the photons emitted from the light emitting device to a first range of longer wavelengths;
a second photoluminescent material layer positioned such that the first photoluminescent material layer is between the second photoluminescent material layer; and
a first filter positioned between the light emitting device and the first photoluminescent material layer, wherein the first filter is substantially transmissive of light emitted by the light emitting device and substantially reflective of light emitted by the first and second photoluminescent material layers. - View Dependent Claims (22, 23, 24, 25, 26)
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27. An apparatus for measuring a spectroscopic property of a target material comprising:
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an illumination source for emitting light photons to impinge upon the target material, the illumination source comprising;
a light emitting device;
at least one photoluminescent material layer that absorbs light emitted from the light emitting device and converts the wavelengths of at least a portion of the photons emitted from the light emitting device to longer wavelengths; and
at least one filter positioned between the light emitting device and the photoluminescent material layer, wherein the filter is substantially transmissive of light emitted by the light emitting device and substantially reflective of light emitted by the photoluminescent material layer an optical radiation sensing device for detecting light at least one of reflected by or transmitted through the target material. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification