Phosphor based light sources having front illumination
First Claim
Patent Images
1. A light source, comprising:
- an LED capable of emitting light;
a layer of phosphor material positioned to receive excitation light and emitting visible light when illuminated with the excitation light; and
interference reflector means for reflecting at least some light emitted by the LED that has not passed through the phosphor material, onto the layer of phosphor material and transmitting at least some visible light emitted by the phosphor.
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Abstract
A light source including a layer of phosphor material, an LED capable of emitting light that excites the phosphor material, an interference reflector positioned to reflect at least some light emitted by the LED that has not passed through the phosphor material, onto the layer of phosphor material.
105 Citations
23 Claims
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1. A light source, comprising:
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an LED capable of emitting light;
a layer of phosphor material positioned to receive excitation light and emitting visible light when illuminated with the excitation light; and
interference reflector means for reflecting at least some light emitted by the LED that has not passed through the phosphor material, onto the layer of phosphor material and transmitting at least some visible light emitted by the phosphor. - View Dependent Claims (3)
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2. A light source, comprising:
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a layer of phosphor material;
an LED capable of emitting light that excites the phosphor material; and
an interference reflector positioned to reflect at least some light emitted by the LED that has not passed through the phosphor material, onto the layer of phosphor material. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of illuminating phosphor comprising:
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providing a layer of phosphor material and an LED capable of emitting light that excites the phosphor material;
emitting light from the LED toward a reflector to produce LED emitted light; and
reflecting the LED emitted light, at least a portion of which has not passed through the layer of phosphor material, onto the layer of phosphor material. - View Dependent Claims (23)
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Specification