Light-emitting device and manufacturing method thereof

Abstract

This disclosure discloses a light-emitting device. The light-emitting device includes a light-emitting stack with a first (top) surface, a bottom surface and at least one side surface connected to the first surface and the bottom surface, a light-reflective enclosure with a second (top) surface, a contact electrode formed on the bottom surface of the light-emitting layer, and a wavelength converting layer. Moreover, the light-reflective enclosure surrounds the side surface of the light-emitting stack and exposes to the first surface. The wavelength converting layer covers the first surface and the second surface. In addition, the second surface has a plurality of fine concave structures distributed on the second surface.

What is claimed is: 
     
         1 . A light-emitting device, comprising:
 a light-emitting stack comprising a first surface, a bottom surface and at least one side surface connected to the first surface and the bottom surface;   a light-reflective enclosure, comprising a second surface, surrounding the side surface and, exposing the first surface;   a contact electrode formed on the bottom surface of the light-emitting stack; and   a wavelength converting layer covering the first surface and the second surface;   wherein the second surface comprises a plurality of fine concave structures.   
     
     
         2 . The light-emitting device of  claim 1 , wherein a roughness of the first surface is smaller than a roughness of the second surface. 
     
     
         3 . The light-emitting device of  claim 1 , wherein the wavelength converting layer fills the plurality of fine concave structures. 
     
     
         4 . The light-emitting device of  claim 1 , wherein the wavelength converting layer comprises a thickness, and a variation of the thickness and an average thickness is less than 5%. 
     
     
         5 . The light-emitting device of  claim 1 , wherein the first surface to the contact electrode has a first height and the second surface to the contact electrode has a second height, and wherein a variation of the first height and the second height is less than 40 μm. 
     
     
         6 . The light-emitting device of  claim 1 , wherein a roughness of root-mean-square (RMS) of the second surface is greater than 100 nm. 
     
     
         7 . The light-emitting device of  claim 1 , wherein the light-reflective enclosure comprises a light-reflective material and a binding agent. 
     
     
         8 . The light-emitting device of  claim 1 , further comprising an extension pad formed on the contact electrode, and the extension pad comprises a first surface area greater than a second surface area of the contact electrode. 
     
     
         9 . The light-emitting device of  claim 1 , further comprising a reflective layer surrounding the contact electrode. 
     
     
         10 . A method of making a light-emitting device, comprising:
 providing a light-emitting stack and a contact electrode, wherein the light-emitting stack comprises a first surface, a bottom surface, and a side surface connected to the first surface and the bottom surface, and the contact electrode is formed on the bottom surface;   connecting the light-emitting stack to a temporary substrate, and exposing the side surface and one of the first surface and the bottom surface from the temporary substrate;   covering a light-reflective material on the side surface and one of the first surface and the bottom surface exposed from the temporary substrate;   removing a portion of the light-reflective material to expose the first surface or the bottom surface and forming a light-reflective enclosure comprising a second surface, wherein the second surface comprises a plurality of fine concave structures distributed on the second surface; and   removing the temporary substrate.   
     
     
         11 . The method of making the light-emitting device of  claim 10 , wherein the temporary substrate exposes the first surface. 
     
     
         12 . The method of making the light-emitting device of  claim 10 , further comprising covering the first surface and the second surface by a wavelength converting layer. 
     
     
         13 . The method of making the light-emitting device of  claim 10 , wherein covering the light-reflective material comprises a transfer molding or a compression molding. 
     
     
         14 . The method of making the light-emitting device of  claim 10 , wherein removing a portion of the light-reflective material comprises a wet blasting deflash. 
     
     
         15 . A light-emitting device, comprising:
 a light-emitting stack comprising a first surface, a bottom surface and at least one side surface connected to the first surface and the bottom surface;   a light-reflective enclosure, comprising a second surface, an inner sidewall, and an outer sidewall, surrounding the side surface of the light-emitting stack, exposing to the first surface, wherein the second surface comprises a first convex structure protruded outward from the inner sidewall to the outer sidewall;   a contact electrode formed on the bottom surface of the light-emitting stack; and   a wavelength converting layer covering the first surface and the second surface.   
     
     
         16 . The light-emitting device of  claim 15 , wherein the light-reflective enclosure comprises a corner, and a position of the first convex structure corresponding to the corner. 
     
     
         17 . The light-emitting device of  claim 15 , wherein a portion of the inner sidewall is lower than a portion of the outer sidewall. 
     
     
         18 . The light-emitting device of  claim 15 , wherein the light-reflective enclosure further comprises a second convex structure and a flat region disposed between the first convex structure and the second convex structure. 
     
     
         19 . The light-emitting device of  claim 15 , wherein the first convex structure comprises an arc-like structure.