Light emitting diode chip having distributed bragg reflector and method of fabricating the same
DCFirst Claim
1. A light-emitting diode chip configured to emit light of a first wavelength range and light of a second wavelength range, comprising:
- a substrate;
a light-emitting structure disposed on a first surface of the substrate, the light-emitting structure comprising an active layer disposed between a first conductivity-type semiconductor layer and a second conductivity-type semiconductor layer, and configured to emit light of the first wavelength range;
first and second distributed Bragg reflectors (DBRs) disposed on a second surface of the substrate; and
a phosphor disposed on the light-emitting structure,wherein;
the first DBR is disposed closer to the substrate than the second DBR;
the first wavelength range comprises a blue wavelength range;
light of the second wavelength range is converted by the phosphor;
the first DBR comprises a higher reflectivity for light of the second wavelength range than for light of the first wavelength range; and
the second DBR comprises a higher reflectivity for light of the first wavelength range than for light of the second wavelength range.
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Abstract
A light-emitting diode chip configured to emit light of a first wavelength range and light of a second wavelength range, including a substrate, a light-emitting structure disposed on a first surface of the substrate, the light-emitting structure including an active layer disposed between a first conductivity-type semiconductor layer and a second conductivity-type semiconductor layer, and configured to emit light of the first wavelength range, and first and second distributed Bragg reflectors (DBRs) disposed on a second surface of the substrate. The first DBR is disposed closer to the substrate than the second DBR, the first wavelength range comprises a blue wavelength range, the first DBR comprises a higher reflectivity for light of the second wavelength range than for light of the first wavelength range, and the second DBR comprises a higher reflectivity for light of the first wavelength range than for light of the second wavelength range.
39 Citations
20 Claims
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1. A light-emitting diode chip configured to emit light of a first wavelength range and light of a second wavelength range, comprising:
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a substrate; a light-emitting structure disposed on a first surface of the substrate, the light-emitting structure comprising an active layer disposed between a first conductivity-type semiconductor layer and a second conductivity-type semiconductor layer, and configured to emit light of the first wavelength range; first and second distributed Bragg reflectors (DBRs) disposed on a second surface of the substrate; and a phosphor disposed on the light-emitting structure, wherein; the first DBR is disposed closer to the substrate than the second DBR; the first wavelength range comprises a blue wavelength range; light of the second wavelength range is converted by the phosphor; the first DBR comprises a higher reflectivity for light of the second wavelength range than for light of the first wavelength range; and the second DBR comprises a higher reflectivity for light of the first wavelength range than for light of the second wavelength range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of fabricating a light-emitting diode chip configured to emit light of a first wavelength range and light of a second wavelength range, the method comprising:
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forming a light-emitting structure on a first surface of a substrate, the light-emitting structure comprising; an active layer disposed between a first conductivity-type semiconductor layer and a second conductivity-type semiconductor layer, and configured to emit light of the first wavelength range; controlling a surface roughness of a second surface of a substrate; forming a phosphor layer configured to emit light of a red wavelength range on the light-emitting structure; and forming first and second distributed Bragg reflectors (DBRs) on the second surface of the substrate, wherein; the first DBR is disposed closer to the substrate than the second DBR; the first wavelength range comprises a blue wavelength range; the first DBR comprises a higher reflectivity for light of the second wavelength range than for light of the first wavelength range; and the second DBR comprises a higher reflectivity for light of the first wavelength range than for light of the second wavelength range. - View Dependent Claims (18, 19, 20)
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Specification