Light-emitting device having patterned substrate and method of manufacturing thereof

Abstract

A light-emitting device disclosed herein comprises a patterned substrate having a plurality of cones, wherein a space is between two adjacent cones. A light-emitting stack formed on the cones. Furthermore, the cones comprise an area ratio of a top area of the cone and a bottom area of the cone which is less than 0.0064.

The invention claimed is: 
     
       1. A light-emitting device, comprising:
 a patterned substrate having a plurality of cones, wherein each of the plurality of cones comprises a top having a top width, a bottom having a bottom width, a sidewall between the top and the bottom, and a height H, wherein an area ratio of the top and to the bottom of the cone is less than 0.0064, and H>1.5 μm and the top width is larger than zero; and a light-emitting stack formed on the cones, wherein the light-emitting stack comprises a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer. 
 
     
     
       2. The light-emitting device according to  claim 1 , wherein the sidewall between the top and the bottom is inclined. 
     
     
       3. The light-emitting device according to  claim 1 , wherein the a shape of the top comprises a circle. 
     
     
       4. The light-emitting device according to  claim 1 , wherein the a shape of the bottom comprises a circle. 
     
     
       5. The light-emitting device according to  claim 2 , wherein a cross-section of the inclined sidewall comprises an arc with a chord protruded outward. 
     
     
       6. The light-emitting device according to  claim 1 , further comprising an intermediate layer having a refractive index formed on the patterned substrate. 
     
     
       7. The light-emitting device according to  claim 6 , wherein the top width is smaller than the a quotient of the a wavelength of light emitted from the light-emitting device divided by the refractive index of the intermediate layer. 
     
     
       8. The light-emitting device according to  claim 1 , wherein the top width of the cone is smaller than 0.1 μm. 
     
     
       9. The light-emitting device according to  claim 5 , further comprising a distance between two of the adjacent cones, wherein the distance is between 0.1-0.4 μm. 
     
     
       10. The light-emitting device according to  claim 2 , wherein an angle between the bottom of the cone and the chord of the arc is between 40-60 degrees. 
     
     
       11. The light-emitting device according to  claim 9 , wherein a maximum distance between the arc and the chord of the arc is smaller than 0.5 μm. 
     
     
       12. The light-emitting device according to  claim 1 , wherein a first ratio of the top width of the cone to the bottom width of the cone is smaller than 0.08. 
     
     
       13. The light-emitting device according to  claim 1 , wherein at least one of the cones satisfies 0.4<H/(D 1 +S)<=0.6, wherein D 1  represents the bottom width of the cone, and S represents the distance between two of the adjacent cones. 
     
     
       14. The light-emitting device according to  claim 9 , wherein at least one of the cones satisfies 0.01<S/(D 1 +S)<0.3, wherein D 1  represents the top width of the cone, and S represents the distance between two of the adjacent cones. 
     
     
       15. The light-emitting device according to  claim 11 , wherein at least one of the cones satisfies 0<B/(D I D1+S)<=0.2, wherein D 1  represents the top bottom width of the cone, B represents the maximum distance of the arc and the chord of the arc, and S represents the distance between two of the adjacent cones. 
     
     
       16. The light-emitting device according to  claim 1 , wherein the area of the top of the cone is zero. 
     
     
       17. The light-emitting device according to claim 1, wherein each of the plurality of cones is disposed on the patterned substrate in a predetermined period. 
     
     
       18. The light-emitting device according to claim 17, wherein the predetermined period comprises a fixed period, a variable period, or a quasi-period. 
     
     
       19. A light-emitting device, comprising:
 a substrate comprising a plurality of cones, wherein each of the plurality of cones comprises a top having a top width, a bottom having a bottom width, a sidewall between the top and the bottom, and a height H, wherein an area ratio of the top to the bottom of the cone is less than 0.0064, and H>1.5 μm; and   wherein a cross-section of the sidewall comprises an arc with a chord protruded outward, and the one of the plurality of cones satisfies 0<B/(D1+S)<=0.2;   wherein D1 represents the bottom width, B represents a maximum distance between the arc and the chord, and S represents a distance between the one of the plurality of cones and another one of the plurality of cones adjacent to the one of the plurality of cones.   
     
     
       20. The light-emitting device according to claim 19, wherein an angle between the bottom and the chord of the arc is between 40-60 degrees. 
     
     
       21. The light-emitting device according to claim 19, wherein the maximum distance between the arc and the chord is smaller than 0.5 μm. 
     
     
       22. The light-emitting device according to claim 19, wherein a ratio of the top width to the bottom width is smaller than 0.08, and the top width is larger than zero. 
     
     
       23. The light-emitting device according to claim 19, wherein the one of the plurality of cones satisfies 0.4<H/(D1+S)<=0.6. 
     
     
       24. The light-emitting device according to claim 19, wherein the one of the plurality of cones satisfies 0.01<S/(D1+S)<0.3. 
     
     
       25. A light-emitting device, comprising:
 a patterned substrate having a plurality of cones, wherein each of the plurality of cones comprises a top having a top width, a bottom having a bottom width, a sidewall between the top and the bottom, and a height H, wherein an area ratio of the top to the bottom of the cone is less than 0.0064, and H>1.5 μm; and   an intermediate layer having a refractive index formed on the patterned substrate;   wherein the top width is smaller than a quotient of a wavelength of light emitted from the light-emitting device divided by the refractive index of the intermediate layer, and the top width is larger than zero.   
     
     
       26. The light-emitting device according to claim 25, wherein a cross-section of the sidewall comprises an arc with a chord protruded outward, and an angle between the bottom and the chord of the arc is between 40-60 degrees. 
     
     
       27. The light-emitting device according to claim 25, wherein a maximum distance between the arc and the chord of the arc is smaller than 0.5 μm. 
     
     
       28. The light-emitting device according to claim 25, wherein a ratio of the top width to the bottom width is smaller than 0.08. 
     
     
       29. The light-emitting device according to claim 25, wherein the one of the plurality of cones satisfies 0.4<H/(D1+S)<=0.6, wherein D1 represents the bottom width, and S represents a distance between the one of the plurality of cones and another one of the plurality of cones adjacent to the one of the plurality of cones. 
     
     
       30. The light-emitting device according to claim 25, wherein the one of the plurality of cones satisfies 0.01<S/(D1+S)<0.3, wherein D1 represents the bottom width, and S represents a distance between the one of the plurality of cones and another one of the plurality of cones adjacent to the one of the plurality of cones. 
     
     
       31. The light-emitting device according to claim 30, wherein 0.03<S/(D1+S)<0.15. 
     
     
       32. The light-emitting device according to claim 25, wherein an area ratio of the top to the bottom is less than 0.0064.