Phosphor based light sources utilizing total internal reflection
First Claim
1. An LED package, comprising:
- an LED that emits excitation light at an excitation light wavelength;
a layer of phosphor material positioned to receive the excitation light and having a first index of refraction at the excitation light wavelength, the phosphor material emitting visible light at a visible light wavelength when illuminated with the excitation light;
an interference reflector positioned adjacent to the layer of phosphor material; and
a TIR promoting layer in contact with the layer of phosphor material, the TIR promoting layer having a second index of refraction at the excitation light wavelength that is less than the first index of refraction at the excitation light wavelength.
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Abstract
A LED package including an LED that emits excitation light at an excitation light wavelength and a layer of phosphor material positioned to receive the excitation light and having a first index of refraction at the excitation light wavelength. The phosphor material emits visible light at a visible light wavelength when illuminated with the excitation light. An interference reflector is positioned adjacent to the layer of phosphor material and a TIR promoting layer is in contact with the layer of phosphor material. The TIR promoting layer has a second index of refraction at the excitation light wavelength that is less than the first index of refraction at the excitation light wavelength.
273 Citations
23 Claims
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1. An LED package, comprising:
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an LED that emits excitation light at an excitation light wavelength;
a layer of phosphor material positioned to receive the excitation light and having a first index of refraction at the excitation light wavelength, the phosphor material emitting visible light at a visible light wavelength when illuminated with the excitation light;
an interference reflector positioned adjacent to the layer of phosphor material; and
a TIR promoting layer in contact with the layer of phosphor material, the TIR promoting layer having a second index of refraction at the excitation light wavelength that is less than the first index of refraction at the excitation light wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification