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Efficient Thermal Management for Power LEDs
In the world of power LEDs with high luminous efficacy and energy efficiency, efficient thermal management is critical. The thermal power generated during operation of these LEDs can significantly affect performance and lifetime. The thermal power dissipation in power LEDs occurs in the semiconductors.
Some of the electrical energy is converted into light, but a significant amount is released as heat. The ability to effectively dissipate this heat is key to extending the life and maintaining the quality of the lighting.
OPTIMIZED HEAT FLOW
For optimized heat flow, various thermal interface materials (TIM) can be used. These include thermal conductive pastes (TCP), phase change materials (PCM), graphite foils, thermal conductive adhesives and PSA tapes. The choice between adhesive and non-adhesive thermal interface materials depends on the specific requirements. Adhesive materials provide a permanent bond between the LED and heat sink, while non-adhesive materials allow for easier disassembly but require fasteners such as screws and clips. Selecting the right installation location is critical to achieve optimal results.
HALA YOUR SPECIALIST
HALA specializes in thermal interface material (TIM) design-in and customized solutions. We believe that efficient thermal management further drives not only performance, but also the sustainability of applications.
See also: thermally conductive silicone foils for electrically insulating flat interfaces and silicone caps for TO-package LEDs requiring all-around insulation.
Contact us to find out how we can improve your thermal management.
FAQ
Power LEDs convert only part of the electrical energy into light — the rest is released as heat in the semiconductor junction. If this heat is not effectively dissipated to the heat sink, junction temperature rises, causing reduced luminous efficacy, colour shift, accelerated lumen depreciation and shortened lifetime. Every degree of junction temperature reduction directly extends LED lifetime and maintains light quality.
Power LEDs use a range of TIMs depending on the mounting method: phase change materials for lowest thermal resistance with screwed or clipped assemblies, thermally conductive adhesives or PSA tapes for permanent bonded assemblies, graphite foils for lateral heat spreading, and thermally conductive grease for reworkable installations.
Adhesive TIMs — such as thermally conductive adhesives or PSA tapes — permanently bond the LED to the heat sink, eliminating the need for screws or clips and enabling compact, lightweight designs. Non-adhesive TIMs — such as phase change materials or thermally conductive foils — require mechanical fasteners but allow easier disassembly for rework or replacement.
Graphite foils spread heat laterally from the LED hot spot at up to 1,950 W/mK in-plane, distributing the heat flux more evenly across the heat sink surface. This reduces peak temperatures at the LED junction and increases overall cooling efficiency — particularly valuable in high-density multi-LED arrays where individual hot spots would otherwise limit total luminous output.
Yes. HALA specializes in TIM design-in for specific power LED applications — from material selection through prototype sampling to series supply of custom die-cut parts. Contact HALA’s experts for a free consultation and sample.
