Back to results
US 8,299,479 B2Granted
Light-emitting devices with textured active layer
AssigneeTSMC Solid State Lighting Ltd.
InventorHsin-Chieh Huang
Life of this patent
Estimating the term…
Abstract
A device includes a textured substrate having a trench extending from a top surface of the textured substrate into the textured substrate, wherein the trench comprises a sidewall and a bottom. A light-emitting device (LED) includes an active layer over the textured substrate. The active layer has a first portion parallel to the sidewall of the trench and a second portion parallel to the bottom of the trench.
Claims20
A device comprising:
- a textured substrate comprising a first trench and a second trench each extending from a top surface of the textured substrate into the textured substrate, wherein the first trench comprises a first sidewall and a first bottom, wherein the second trench comprises a second sidewall and a second bottom, and wherein a first slant angle of the first sidewall is different from a second slant angle of the second sidewall;
- and
- a light-emitting device (LED) over the textured substrate and comprising an active layer, wherein the active layer comprises a first portion parallel to the first sidewall, a second portion parallel to the first bottom, and a third portion parallel to the second sidewall.
A device comprising:
- a textured substrate comprising a textured top surface with a top portion, a bottom portion parallel to, and lower than, the top portion, and a slant portion connecting the top portion to the bottom portion and forming a slant angle with the top portion and the bottom portion;
- and
- a light-emitting device (LED) comprising:
- a first cladding layer of a first conductivity type over the textured top surface;
- an active layer over the first cladding layer;
- and
- a second cladding layer of a second conductivity type opposite the first conductivity type over the active layer, wherein each of the first cladding layer, the active layer, and the second cladding layer is a conformal textured layer comprising first portions, second portions, and third slant portions, and wherein the second portions are parallel to, and higher than, the first portions, and wherein at least two of the third slant portions have different slant angles from each other.
4 more elements
A device comprising:
- a textured substrate comprising a plurality of trenches each extending from a top surface of the textured substrate into the textured substrate, wherein the trenches each include a respective sidewall and a respective bottom, wherein at least some of the trenches are shaped differently from other trenches;
- and
- a light-emitting device comprising:
- a first cladding layer of a first conductivity type and over the top surface of the textured substrate;
- an active layer over the first cladding layer;
- and
- a second cladding layer of a second conductivity type opposite the first conductivity type over the active layer, wherein each of the first cladding layer, the active layer, and the second cladding layer has a non-flat top surface.
4 more elements
Dependencies are inferred from the claim text.