Light emitting device and method of forming the same
AssigneeEpistar Corporation
InventorsMin-Hsun HSIEH, Chih-Chiang LU, Ching-Pu TAI
Life of this patent
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Abstract
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.
Claims26
A light-emitting device, comprising:
- a transparent substrate;
- a transparent adhesive layer on said transparent substrate;
- a multi-layer epitaxial structure on said transparent adhesive layer, and said multi-layer epitaxial structure comprising a light-emitting layer;
- a first electrode on said transparent adhesive layer;
- and
- a second electrode on said multi-layer epitaxial structure;
- wherein said transparent substrate 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 said light-emitting layer is not less than 1.6.
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.
A method of forming a light-emitting device, comprising:
- providing a transparent substrate having a light-emitting element thereon, said light-emitting element comprising a transparent adhesive layer on said transparent substrate, a multi-layer epitaxial structure on said transparent adhesive layer, a first electrode on said transparent adhesive layer, and a second electrode on said multi-layer epitaxial structure;
- and
- cutting said transparent substrate to make the ratio of the area of a second surface of said transparent substrate, distant from said transparent adhesive layer, to the area of a light-emitting layer of said multi-layer epitaxial structure is not less than 1.6.
The method according to claim 28, further comprising providing a reflective layer on said second surface.
The method according to claim 28, wherein said cutting step is performed by use of a diamond tool or a laser tool.
The method according to claim 28, wherein said transparent substrate comprises a first surface opposite to said second surface, the ratio of the area of said second surface to the area of said first surface ranges between 4 and 20.
The method according to claim 35, wherein said first surface further comprises an exposed portion not covered with said light-emitting layer.
Dependencies are inferred from the claim text.