Light-emitting diode chip, device, and lamp
A light-emitting diode (LED) chip includes a semiconductor epitaxial structure, an insulating substrate, a first metal layer, and a second metal layer. The semiconductor epitaxial structure includes a first semiconductor epitaxial layer, a second semiconductor epitaxial layer, and a light-emitting layer interposed between the first semiconductor epitaxial layer and the second semiconductor epitaxial layer. The insulating substrate has two opposite surfaces, and the first and second metal layers are respectively disposed on the two surfaces of the insulating substrate. An LED device and an LED lamp including the LED chip are also disclosed.
1. A light-emitting diode (LED) device, comprising:
a semiconductor epitaxial structure including a first semiconductor epitaxial layer, a second semiconductor epitaxial layer, and a light-emitting layer interposed between said first semiconductor epitaxial layer and said second semiconductor epitaxial layer;
a packaging substrate unit for support;
an insulating substrate having two opposite surfaces;
a first metal layer disposed on one of said two surfaces of said insulating substrate; and
a second metal layer disposed on the other one of said two surfaces of said insulating substrate,
wherein said first metal layer, said second metal layer and said insulating substrate cooperatively form a capacitor structure that is electrically connected in parallel to said semiconductor epitaxial structure;
wherein said packaging substrate unit includes a packaging substrate, and a first conductive layer and a second conductive layer that are disposed on said packaging substrate and that are spaced apart from each other, said first metal layer being electrically connected to said first conductive layer, said second metal layer being electrically connected to said second conductive layer.
2. The LED device of claim 1 , wherein one of said first and second metal layers is interposed between said insulating substrate and said packaging substrate unit.
3. The LED device of claim 1 , further comprising a first electrically connecting element that is electrically connected to said first semiconductor epitaxial layer, and a second electrically connecting element that is electrically connected to said second semiconductor epitaxial layer.
4. The LED device of claim 3 , further comprising two solder wires, one of said solder wires interconnecting said first electrically connecting element and said first conductive layer, the other one of said solder wires interconnecting said second electrically connecting element and said second conductive layer.
5. An LED lamp, comprising an LED device as claimed in claim 1 .
6. The LED device of claim 1 , wherein said capacitor structure has a capacitance ranging from 0.5 pF to 100 pF.
7. The LED device of claim 1 , wherein the dielectric constant of said insulating substrate ranges from 3.3 to 30.
8. The LED device of claim 1 , wherein each of said first and said second metal layers has a connecting surface for connecting with said insulating substrate, said connecting surface having an area that is greater than 0.5 mm 2 and is smaller than 20 mm 2 .
9. The LED device of claim 1 , wherein said insulating substrate has a thickness ranging from 80 μm to 150 μm.
10. The LED device of claim 1 , wherein said insulating substrate is made of a material selected from the group consisting of sapphire, aluminium oxide, aluminium nitride, silica, and combinations thereof.
11. The LED device of claim 1 , wherein each of said first metal layer and said second metal layer includes one of an ohmic contact layer, a bonding layer, an adhesive layer, and a metal reflection layer.
12. The LED device of claim 1 , further comprising a first electrically connecting element that is electrically connected to said first semiconductor epitaxial layer, and a second electrically connecting element that is electrically connected to said second semiconductor epitaxial layer.
13. The LED device of claim 12 , wherein said semiconductor epitaxial structure further includes at least one hole that is defined by a hole-defining wall, and that extends through said second semiconductor epitaxial layer and said light-emitting layer and terminates at and exposes said first semiconductor epitaxial layer, said first electrically connecting element including an extending connection part that extends into said hole and contacts with said first semiconductor epitaxial layer.
14. The LED device of claim 13 , further comprising an insulating layer for electrically isolating said second electrically connecting element from said first metal layer and said first electrically connecting element, said insulating layer covering said hole-defining wall and being disposed between said extending connection part and said semiconductor epitaxial structure, said extending connection part being made of a metal material.
15. The LED device of claim 12 , wherein each of said first electrically connecting element and said second electrically connecting element is made of a material selected from the group consisting of metal, alloy, indium tin oxide (ITO), gallium-doped zinc oxide (GZO), aluminum-doped zinc oxide (AZO), and combinations thereof.