Light-emitting device and manufacturing method thereof
A light-emitting device and a manufacturing method thereof are provided. The light-emitting device includes a substrate, an epitaxial blocking layer, and a light-emitting epitaxial structure. The substrate has a surface, in which the surface includes a plurality of protruding parts and a plurality of recess parts relative to the protruding parts. The epitaxial blocking layer disposed on the substrate covers the recess parts and exposes the protruding parts. The light-emitting epitaxial structure disposed on the substrate is connected to the protruding parts and is disposed above the recess parts. The light-emitting epitaxial structure is formed by using the protruding parts as a growth surface thereof so as to have a better crystalline quality.
1. A light-emitting device comprising:
a substrate having a surface, wherein the surface includes a plurality of protruding parts and a plurality of recess parts relative to the protruding parts;
an epitaxial blocking layer disposed on the substrate, wherein the epitaxial blocking layer covers the recess parts and exposes the protruding parts; and
a light-emitting epitaxial structure disposed on the substrate, wherein the light-emitting epitaxial structure is connected to the protruding parts and is disposed above the recess parts;
wherein the protruding parts serve as a growth surface of the light-emitting epitaxial structure, the recess parts respectively define a plurality of spaces, the epitaxial blocking layer fills each of the spaces and has a non-growth surface, and the growth surface is flush with the non-growth surface.
2. The light-emitting device according to claim 1 , wherein at least one pore exists between a bottom surface of the light-emitting epitaxial structure and the non-growth surface.
3. The light-emitting device according to claim 1 , wherein the non-growth surface is a curved surface, and a plurality of voids are defined between a portion of a bottom surface of the light-emitting epitaxial structure and the non-growth surface.
4. The light-emitting device according to claim 1 , wherein a refractive index of the epitaxial blocking layer is smaller than that of the substrate.
5. The light-emitting device according to claim 1 , wherein the epitaxial blocking layer completely covers the surfaces of the recess parts.
6. A light-emitting device comprising:
a substrate having a surface, wherein the surface includes a plurality of protruding parts and a plurality of recess parts relative to the protruding parts;
an epitaxial blocking layer disposed on the substrate, wherein the epitaxial blocking layer covers the recess parts and exposes the protruding parts; and
a light-emitting epitaxial structure disposed on the substrate, wherein the light-emitting epitaxial structure is connected to the protruding parts and is disposed above the recess parts;
wherein any two adjacent protruding parts are spaced apart from each other by a horizontal distance in a cross section of the substrate, and a ratio of the horizontal distance to a width of each of the protruding parts ranges from 1 to 20.