Mr. Franklin J. Wall Profile

Franklin J. Wall

Sr Mechanical Pkg Engineer R&D at Lumileds LLC

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Proceedings Article | 26 January 2004 Paper

High-power LED package requirements

Frank Wall, Paul Martin, Gerard Harbers

Proceedings Volume 5187, (2004) https://doi.org/10.1117/12.512477

KEYWORDS: Light emitting diodes, LED lighting, Light sources and illumination, Quantum efficiency, Resistance, Interfaces, General lighting, Packaging, Light, Semiconductors

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Power LEDs have evolved from simple indicators into illumination devices. For general lighting applications, where the objective is to light up an area, white LED arrays have been utilized to serve that function. Cost constraints will soon drive the industry to provide a discrete lighting solution. Early on, that will mean increasing the power densities while quantum efficiencies are addressed. For applications such as automotive headlamps & projection, where light needs to be tightly collimated, or controlled, arrays of die or LEDs will not be able to satisfy the requirements & limitations defined by etendue. Ultimately, whether a luminaire requires a small source with high luminance, or light spread over a general area, economics will force the evolution of the illumination LED into a compact discrete high power package. How the customer interfaces with this new package should be an important element considered early on in the design cycle. If an LED footprint of adequate size is not provided, it may prove impossible for the customer, or end user, to get rid of the heat in a manner sufficient to prevent premature LED light output degradation. Therefore it is critical, for maintaining expected LED lifetime & light output, that thermal performance parameters be defined, by design, at the system level, which includes heat sinking methods & interface materials or methdology.

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