Light emitting diodes with light filters
First Claim
1. A light emitting diode (LED) chip comprising:
- an LED layer capable of emitting light of a first wavelength;
a light conversion layer on the LED layer capable of converting at least a portion of the light of a first wavelength to light of a second wavelength;
a filter layer between the LED layer and the light conversion layer that is transmissive to light of the first wavelength and reflective to light of the second wavelength, the filter layer being directly on at least a portion of the LED layer; and
a pedestal in electrical contact with the LED layer and extending through both the filter layer and the light conversion layer, wherein a top surface of the pedestal is co-planar with a top surface of the light conversion layer.
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Abstract
LED chips including an LED layer or layers capable of emitting light of a first wavelength, a light conversion layer on the LED capable of converting at least a portion of the light of a first wavelength to light of a second wavelength, and a filter layer therebetween that is transmissive to light of a first wavelength and reflective to light of a second wavelength. The filter layer may prevent at least some of the light of a second wavelength from entering the LED layer or layers, where it may be subject to various optical losses, such as internal reflection and absorption. LED chips may also include multiple filter and light conversion layers. Methods of fabrication are also disclosed.
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Citations
34 Claims
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1. A light emitting diode (LED) chip comprising:
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an LED layer capable of emitting light of a first wavelength; a light conversion layer on the LED layer capable of converting at least a portion of the light of a first wavelength to light of a second wavelength; a filter layer between the LED layer and the light conversion layer that is transmissive to light of the first wavelength and reflective to light of the second wavelength, the filter layer being directly on at least a portion of the LED layer; and a pedestal in electrical contact with the LED layer and extending through both the filter layer and the light conversion layer, wherein a top surface of the pedestal is co-planar with a top surface of the light conversion layer. - 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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24. A light emitting diode (LED) chip comprising:
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an LED layer capable of emitting light of a first wavelength, wherein the LED layer comprises an n-type layer and a p-type layer on opposing sides of an active layer; a reflector layer on a first side of the LED layer closest to the p-type layer; a light conversion layer on a second side the LED layer, opposite the first side, capable of converting at least a portion of the light of a first wavelength to light of a second wavelength; a filter layer between the LED layer and the light conversion layer that is transmissive to light of the first wavelength and reflective to light of the second wavelength, the filter layer being directly on at least a portion of the LED layer; and a pedestal in electrical contact with the LED layer and extending through both the filter layer and the light conversion layer, wherein a top surface of the pedestal is co-planar with a top surface of the light conversion layer.
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25. A light emitting diode (LED) chip comprising:
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an LED layer capable of emitting light of a first wavelength; a light conversion layer on the LED layer capable of converting at least a portion of the light of a first wavelength to light of a second wavelength; a filter layer between the LED layer and the light conversion layer that is transmissive to light of the first wavelength and reflective to light of the second wavelength, the filter layer being directly on at least a portion of the LED layer; an encapsulation layer on the filter layer wherein the light conversion layer is between the encapsulation layer and the filter layer and the encapsulation layer includes at least one flat surface that is spaced apart from the light conversion layer; and a pedestal in electrical contact with the LED layer and extending through both the filter layer and the light conversion layer.
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26. A light emitting diode (LED) package comprising:
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a first LED chip capable of emitting light of a first wavelength; a second LED chip capable of emitting light of a second wavelength, different than the first wavelength; a filter layer on the first LED chip that is transmissive to light of the first wavelength and reflective to light of the second wavelength, wherein the filter layer is configured to reduce light from the second LED chip from entering the first LED chip; a common encapsulation layer that covers both the first LED chip and the second LED chip; a submount wherein the first and second LED chips are on the submount; a reflector layer that is between at least one of the first and second LEDs and the submount; and wherein the first LED chip and second LED chip are separate from one another. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A light emitting diode (LED) package comprising:
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a first LED chip capable of emitting light of a first wavelength; a second LED chip capable of emitting light of a second wavelength, different than the first wavelength; a filter layer on the first LED chip that is transmissive to light of the first wavelength and reflective to light of the second wavelength, wherein the filter layer is configured to reduce light from the second LED chip from entering the first LED chip; a common encapsulation layer that covers both the first LED chip and the second LED chip; a second filter layer on the second LED chip that is transmissive to light of the second wavelength and reflective to light of the first wavelength; and wherein the first LED chip and second LED chip are separate from one another. - View Dependent Claims (34)
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Specification