Systems and methods for managing heat from an LED
Light-emitting devices and particularly light-emitting device assemblies that include light-emitting diodes (LEDs) as light sources are described. The methods and systems of at least some of the embodiments described herein increase the removal of thermal energy generated by the light-emitting devices.
1. A system for managing heat created from an LED comprising:
an LED;
a substrate, wherein the substrate is both thermally and electrically coupled to the LED;
an electrically conductive pathway connected to the LED; and
a first electrically insulating medium separating the electrically conductive pathway from the substrate; wherein the LED, the substrate, the electrically conductive pathway, and the first electrically insulating medium form a first-level surface mounting device; and
a receiving substrate comprised of, at least in part, copper or aluminum and thermally coupled to the first-level surface mounting device, the receiving substrate including electrical traces that are electrically connected to the electrically conductive pathway, the receiving substrate including a second electrically insulating medium separating the electrical traces from the copper or the aluminum of the receiving substrate.
2. The system of claim 1 , wherein the substrate has a thermal conductivity greater than 380 W/mK.
3. The system of claim 1 , wherein the first-level surface mounting device is devoid of externally protruding electrical leads.
4. The system of claim 1 , wherein the CTE strain differential between the LED and the substrate is less than 12 ppm/° C.
5. The system of claim 1 , wherein the electrically conductive pathway passes through the top and bottom surfaces of the substrate.
6. The system of claim 1 , further including a plurality of electrically conductive pathways coupled to the substrate.
7. The system of claim 1 , wherein the substrate is a copper material.
8. The system of claim 6 , wherein some of the plurality of electrically conductive pathways are insulated from the substrate.
9. The system of claim 8 , wherein some of the plurality of electrically conductive pathways are coupled to the top surface of the substrate.
10. The system of claim 8 , wherein some of the plurality of electrically conductive pathways are coupled to the bottom surface of the substrate.
11. The system of claim 1 , wherein the receiving substrate has a thermal conductivity greater than 200 W/mK.
12. The system of claim 1 ], wherein the CTE of the receiving substrate is greater than 20 ppm/° C.
13. The system of claim 1 , wherein the CTE strain differential between the surface mounting device and the receiving substrate is less than 8 ppm/° C.
14. The system of claim 1 , wherein the receiving substrate and the surface mounting device form a second level mounting device.
15. The system of claim 1 , wherein the surface mounting device and the receiving substrate are coupled by solder.