Light emitting diode utilizing a physical pattern
Light-emitting devices, and related components, systems and methods are disclosed. In some embodiments, the light-emitting devices include of multi-stack materials. The multi-stack may include a light-generating region and a first layer supported by the light-generating region. A material in contact with the surface of the first layer may have an index of a refraction less than about 1.5.
1. A light-emitting device, comprising:
a multi-layer stack of materials including a light-generating region, and a first layer that is n-doped and supported by the light-generating region, the first layer including a top surface and a bottom surface opposite the top surface, the top surface being further away from the light-generating region than the bottom surface, the top surface of the first layer being configured so that light generated by the light-generating region can emerge from the light-emitting device via the top surface of the first layer, the first layer having a thickness of less than 10 microns; and
a material comprising gas in contact with the top surface of the first layer, the material having an index of refraction less than 1.3,
wherein the light emitting device is packaged.
2. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a pattern.
3. The light-emitting device of claim 1 , wherein the top surface of the first layer has holes with a size of less than λ/5, where λ is a wavelength of light that can be emitted by the first layer.
4. The light-emitting device of claim 1 , wherein the light-emitting device is in the form of a packaged die.
5. The light-emitting device of claim 1 , wherein the gas comprises air.
6. The light-emitting device of claim 1 , wherein a pressure of the gas is less than 100 Torr.
7. The light-emitting device of claim 1 , wherein the material has an index of refraction of at least one.
8. The light-emitting device of claim 1 , wherein the packaged light-emitting device is free of an encapsulant material.
9. The light-emitting device of claim 1 , further comprising a cover, the material having an index of refraction of less than 1.3 being between the cover and the top surface of the first layer.
10. The light-emitting device of claim 9 , wherein the cover comprises a phosphor material.
11. The light-emitting device of claim 10 , wherein the cover is configured so that light generated by the light-generating region that emerges via the top surface of the first layer can interact with the phosphor material, and so that light that emerges via the top surface of the first layer and interacts with the phosphor material emerges from the cover as substantially white light.
12. The light-emitting device of claim 1 , further comprising:
a first sheet comprising a material that is substantially transparent to light that emerges from the light-emitting device; and
a second sheet comprising a phosphor material, the second sheet being adjacent the first sheet,
wherein the material having an index of refraction of less than 1.3 is between the first sheet and the top surface of the first layer.
13. The light-emitting device of claim 12 , the first and second sheets being configured so that light generated by the light-generating region that emerges via the top surface of the first layer can interact with the phosphor material, and so that light that emerges via the top surface of the first layer and interacts with the phosphor material emerges from the second sheet as substantially white light.
14. The light-emitting device of claim 1 , further comprising a support that supports the multi-layer stack of materials.
15. The light-emitting device of claim 14 , further comprising a layer of reflective material that is capable of reflecting at least 50% of light generated by the light-generating region that impinges on the layer of reflective material, the layer of reflective material being between the support and the multi-layer stack of materials.
16. The light-emitting device of claim 15 , wherein the reflective material is a heat sink material.
17. The light-emitting device of claim 16 , wherein the heat sink material is configured so that the heat sink material has a vertical heat gradient during use of the light-emitting device.
18. The light-emitting device of claim 15 , further comprising a heat sink material disposed adjacent the support.
19. The light-emitting device of claim 18 , wherein the heat sink material is configured so that the heat sink material has a vertical heat gradient during use of the light-emitting device.
20. The light-emitting device of claim 1 , further including a current-spreading layer between the first layer and the light-generating region.
21. The light-emitting device of claim 1 , further comprising electrical contacts configured to inject current into the light-emitting device.
22. The light-emitting device of claim 21 , wherein the electrical contacts are configured to vertically inject electrical current into the light-emitting device.
23. The light-emitting device of claim 1 , wherein the light-emitting device is selected from the group consisting of light-emitting diodes, lasers, optical amplifiers, and combinations thereof.
24. The light-emitting device of claim 1 , wherein the light-emitting device comprises a light emitting diode.
25. The light-emitting device of claim 1 , wherein the light-emitting device is selected from the group consisting of OLEDs, flat surface-emitting LEDs, HBLEDs, and combinations thereof.
26. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a pattern with an ideal lattice constant and a detuning parameter with a value greater than zero.
27. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a pattern, and the pattern does not extend into the light-generating region.
28. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a pattern, and the pattern does not extend beyond the first layer.
29. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a pattern, and the pattern extends beyond the first layer.
30. The light-emitting device of claim 1 , further comprising a layer of reflective material that is capable of reflecting at least 50% of light generated by the light-generating region that impinges on the layer of reflective material,
wherein the light-generating region is between the layer of reflective material and the first layer.
31. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a nonperiodic pattern.
32. The light-emitting device of claim 1 , wherein the top surface of the first layer has a dielectric function that varies spatially according to a complex periodic pattern.
33. The light-emitting device of claim 1 , wherein the first layer is formed directly on the light-generating region.
34. The light-emitting device of claim 1 , wherein the material has an index of refraction of less than 1.2.
35. The light-emitting device of claim 1 , wherein the top surface of the first layer is roughened.
36. The light-emitting device of claim 1 , wherein at least about 50% of the total amount of light generated by the light-generating region emerges from the light-emitting device via the top surface of the first layer.
37. The light-emitting device of claim 1 , wherein at least about 90% of the total amount of light generated by the light-generating region emerges from the light-emitting device via the top surface of the first layer.