Light emitting device and method of forming the same
View Patent ↗A light-emitting device includes a transparent substrate, a transparent adhesive layer on the transparent substrate, a first transparent conductive layer on the transparent adhesive layer, a multi-layer epitaxial structure and a first electrode on the transparent conductive layer, and a second electrode on the multi-layer epitaxial structure. The multi-layer epitaxial structure includes a light-emitting layer. The transparent substrate has a first surface facing the transparent adhesive layer and a second surface opposite to the first surface, wherein the area of the second surface is larger than that of the light-emitting layer, and the area ratio thereof is not less than 1.6.
1. A method of forming a light-emitting device, comprising:
providing a temporary substrate having a multi-layer epitaxial structure and a first transparent conductive layer thereon;
cutting said temporary substrate to form a first dice comprising a portion of each of said multi-layer epitaxial structure, said first transparent conductive layer, and said temporary substrate;
providing a transparent substrate having a transparent adhesive layer on said transparent substrate;
attaching said first dice to said transparent adhesive layer; and
cutting said transparent substrate to form a second dice comprising said first dice, a portion of each of said transparent adhesive layer and said transparent substrate,
wherein said transparent substrate of said second dice has a first surface facing said transparent adhesive layer and a second surface opposite to said first surface, the ratio of the area of said second surface to the area of a light-emitting layer of said second dice is not less than 1.6.
2. The method according to claim 1 , further comprising removing said temporary substrate of said first dice after attaching said first dice on said transparent adhesive layer.
3. The method according to claim 2 , after removing said temporary substrate of said first dice, further comprising:
etching a portion of said multi-layer epitaxial structure of said first dice to expose said first transparent conductive layer;
forming a first electrode on said exposed first transparent conductive layer; and
forming a second electrode on said multi-layer epitaxial structure of said first dice.
4. The method according to claim 1 , after said step of attaching said first dice to said transparent adhesive layer, further comprising removing said transparent adhesive layer not covered with said first dice thereby exposing a portion of the transparent substrate.
5. The method according to claim 1 , further comprising providing a reflective layer on said second surface.
6. The method according to claim 1 , wherein said cutting steps are performed by use of a diamond tool or a laser tool.
7. The method according to claim 1 , wherein the area of said second surface is larger than the area of said first surface.
8. The method according to claim 1 , wherein the ratio of the area of said second surface to the area of said first surface ranges between 4 and 20.
9. The method according to claim 3 , further comprising a step of forming a second transparent conductive layer between said second electrode and said multi-layer epitaxial structure of said first dice.