Arrangement for dissipating thermal energy generated by a light emitting diode
An arrangement for dissipating thermal energy generated by an LED includes an LED and a thermal energy dissipating medium. The LED includes an LED circuit, encapsulating material surrounding the LED circuit, and first and second electrical leads extending into the encapsulating material and electrically connected to the LED circuit. The thermal energy dissipating medium defines an opening therethrough sized to receive therein the LED such that the thermal energy dissipating medium defining the opening is in physical, thermally conductive contact with an exterior surface of at least one side portion of the encapsulating material of the LED. The thermal energy dissipating medium is not electrically connected to any of the LED circuit, the mounting surface, the first electrical lead and the second electrical lead. The thermal energy dissipating medium is formed of a material having a thermal conductivity of greater than or equal to 50 W/mK.
1. Arrangement for dissipating thermal energy generated by a light emitting diode (LED), comprising:
an LED including an LED circuit having a top surface from which radiation is emitted in response to current flow through the LED circuit and an opposite bottom surface mounted to a mounting surface, encapsulating material surrounding the LED circuit, the encapsulating material defining a top portion opposite the top surface of the LED circuit, a bottom portion opposite the bottom surface of the LED circuit and at least one side portion extending between the bottom portion and the top portion, a first electrical lead extending into the encapsulating material and electrically connected to the bottom surface of the LED circuit, and a second electrical lead extending into the encapsulating material and electrically connected to the top surface of the LED, and
a thermal energy dissipating medium defining an opening therethrough sized to receive therein the LED such that the thermal energy dissipating medium defining the opening is in physical, thermally conductive contact with an exterior surface of the at least one side portion of the encapsulating material of the LED,
wherein the thermal energy dissipating medium is not electrically connected to any of the LED circuit, the mounting surface, the first electrical lead and the second electrical lead,
and wherein the thermal energy dissipating medium is formed of a material having a thermal conductivity of greater than or equal to 50 W/mK.
2. The arrangement of claim 1 wherein the thermal energy dissipating medium has a thickness through which the opening is formed.
3. The arrangement of claim 1 wherein the thickness is substantially uniform between the opening and an outer periphery of the thermal energy dissipating medium.
4. The arrangement of claim 1 wherein the thermal energy dissipating medium comprises copper (Cu).
5. The arrangement of claim 1 wherein the thermal energy dissipating medium comprises aluminum (Al).
6. The arrangement of claim 1 wherein the thermal energy dissipating medium comprises one or more of copper (Cu), Aluminum (Al), Gold (Au), Silver (Au), Magnesium (Mg), Tin (Sn), Zinc (Zn), Tungsten (W) and Beryllium (Be).
7. The arrangement of claim 1 wherein the thermal energy dissipating medium is formed of a material having a thermal conductivity of at least 200 W/mK.
8. The arrangement of claim 1 wherein the thermal energy dissipating medium is one of rigid, flexible and semi-flexible.
9. The arrangement of claim 1 wherein the thermal energy dissipating medium is separate from, and is not connected to, the mounting surface.
10. The thermal energy dissipating arrangement of claim 1 wherein the mounting surface forms part of the second electrical terminal.
11. The arrangement of claim 1 further comprising a high surface emissivity coating applied to one or more surface of the thermal energy dissipating medium.
12. The arrangement of claim 1 wherein an interface is defined between the opening defined through thermal energy dissipating medium and the at least one side of the encapsulating material of the LED,
and further comprising a thermally conductive medium interposed in the interface, the thermally conductive medium facilitating transfer of the thermal energy from the LED to the thermal energy dissipating medium.
13. The arrangement of claim 12 wherein the thermally conductive medium comprises at least one of a thermally conductive grease and a thermally conductive bonding medium.
14. The arrangement of claim 1 wherein the LED circuit defines a semiconductor junction between the top and bottom surfaces thereof across which the current flows through the LED circuit, the semiconductor junction defining a plane that is substantially parallel with the top and bottom surfaces of the LED circuit.
15. The arrangement of claim 14 wherein the thermal energy dissipating medium about the opening is substantially aligned with the plane defined by the semiconductor junction of the LED circuit.
16. The arrangement of claim 14 wherein the thermal energy dissipation medium about the opening intersects an angle of less than or equal to a predefined angle relative to the plane defined by the semiconductor junction of the LED circuit.
17. The arrangement of claim 16 wherein the predefined angle is about 60 degrees.
18. The arrangement of claim 16 wherein the predefined angle is about 45 degrees.
19. The arrangement of claim 16 wherein the predefined angle is about 15 degrees.
20. The arrangement of claim 16 wherein the predefined angle is about zero degrees such that the plane defined by the semiconductor junction of the LED circuit substantially bisects the thermal energy dissipating medium about the opening.