LIGHT EMITTING DEVICE
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United States of America Patent
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Oct 25, 2017
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Apr 25, 2013
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Abstract
This disclosure discloses a light-emitting device. The light-emitting device comprises a light-emitting stack having a first-type semiconductor layer, a second-type semiconductor layer, and an active layer formed between the first-type semiconductor layer and the second-type semiconductor layer; a reflective structure formed on the first-type semiconductor layer; and a first interface and a second interface formed between light-emitting stack and the reflective structure; wherein a critical angle at the first interface for a light emitted from the light-emitting stack is larger than that at the second interface; wherein the reflective structure electrically connects to the first-type semiconductor layer at the first interface, and an area of the first interface is more than an area of the second interface.
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