Laminate sub-mounts for LED surface mount package
View Patent ↗An LED package is described that acts as a sub-mount between a printed circuit board and an LED. The sub-mount includes a laminate to thermally isolate the LED from the PCB while providing a thermal heat dissipative sink for the LED.
1. A light emitting diode package comprising:
a light emitting diode;
a metal core having a top portion supporting said light emitting diode; and
a laminate sub-mount surrounding a portion of said metal core, said sub-mount including:
a first metal layer defining a bottom portion of said sub-mount and having a thickness between 17 microns and 70 microns;
a first dielectric layer made from a ceramic filled polymer and positioned above said first metal layer;
a second metal layer positioned above said first dielectric layer and defining a top portion of said sub-mount, said second metal layer having a thickness between 17 microns and 1 mm;
wherein said second metal layer is segmented to form conductive pads layered above said first dielectric, and wherein a via is formed in said first dielectric layer to electrically interconnect said conductive pads with electrically isolated portions of said first metal layer; and
wherein a bottom portion of said first metal layer is aligned with a bottom of said metal core.
2. The diode package as recited in claim 1 , further including a second dielectric and third metal layer sandwiched between said second metal layer and said first dielectric layer.
3. The diode package as recited in claim 1 , wherein said ceramic filled polymer includes a polymer selected from the group consisting of epoxies, polyim ides, cyanate esters, silicones, phenolics, BT resins, benzocyclobutene, silicone, polyphenylsulfone, polyester, and PEN.
4. The diode package as recited in claim 1 , wherein said ceramic filled polymer includes a ceramic filler selected from the group consisting of boron nitride, aluminum oxide, aluminum nitride, silicone carbide, silicon nitride, silica, magnesium oxide, zinc oxide, zirconium oxide, and titanium dioxide.
5. The diode package as recited in claim 1 , wherein said metal core extends between said top portion and bottom portion of said sub-mount.
6. The diode package as recited in claim 5 , wherein said metal core includes a multi-layer metal composite.
7. The diode package as recited in claim 6 , wherein said metal core includes an insulating layer sandwiched between a top layer and bottom layer of said metal core.
8. The diode package as recited in claim 1 , further including a reflective coating layered above said second metal layer.