LED packaging structure and method for manufacturing the same
View Patent ↗A light-emitting diode (LED) packaging structure is provided, which includes a LED stacked layer, a first silicon substrate and a second silicon substrate. The first and second silicon substrates are respectively disposed on two opposite surfaces of the LED stacked layer. The first and second silicon substrates respectively have at least one first hollow portion and at least one second hollow portion, so as to expose the surfaces of a portion of the LED stacked layer. Light emitted by a light-emitting layer may go out through the first and second hollow portions. A method for manufacturing the LED packaging structure is also provided.
1. A light-emitting diode (LED) packaging structure, comprising:
a LED stacked layer comprising a first type semiconductor layer, a second type semiconductor layer beneath the first type semiconductor layer and a light-emitting layer between the first type semiconductor layer and the second type semiconductor layer;
a first silicon substrate disposed on the first type semiconductor layer and electrically connected to the LED stacked layer, wherein the first silicon substrate has at least one first hollow portion through the first silicon substrate to expose a surface of a portion of the first type semiconductor layer; and
a second silicon substrate disposed beneath the second type semiconductor layer and electrically connected to the LED stacked layer, wherein the second silicon substrate has at least one second hollow portion through the second silicon substrate to expose a surface of a portion of the second type semiconductor layer,
wherein the LED stacked layer is between the first silicon substrate and the second silicon substrate, and light emitted by the light-emitting layer goes out through the first and second hollow portions.
2. The LED packaging structure of claim 1 , wherein the first and second silicon substrates are conductive silicon substrates.
3. The LED packaging structure of claim 2 , wherein the first and second type semiconductor layers are n-type and p-type semiconductors, or p-type and n-type semiconductors respectively.
4. The LED packaging structure of claim 3 , further comprising a plurality of electrodes respectively electrically connected to the first silicon substrate and/or the second silicon substrate.
5. The LED packaging structure of claim 1 , further comprising a bonding layer interposed between the first type semiconductor layer and the first silicon substrate and/or between the second type semiconductor layer and the second silicon substrate.
6. The LED packaging structure of claim 5 , wherein the bonding layer comprises a metal layer or a transparent conductive layer.
7. The LED packaging structure of claim 6 , wherein the transparent conductive layer comprises indium tin oxide (ITO), indium zinc oxide (IZO), graphene or carbon nanotube.
8. The LED packaging structure of claim 7 , further comprising an encapsulant disposed in the first and second hollow portions.
9. The LED packaging structure of claim 8 , wherein the encapsulant further comprises a wavelength conversion material.
10. The LED packaging structure of claim 9 , wherein the wavelength conversion material is a fluorescent powder, dye, pigment or combination thereof.
11. The LED packaging structure of claim 1 , further comprising a reflective layer disposed on sidewalls of the first and second hollow portions.