Integrated metal substrates improve LED thermal management

Having a high-brightness LEDs LED manufacturers are adopting similar package design techniques to those now seen in surface-mounted power devices.
However, thermal management between the boundaries of the package and the ambient environment is equally important, and systems integrators are also adopting power electronics techniques to achieve cost-effective solutions.
Effective thermal management influences both the quality and quantity of light output from a high-brightness (HB) LED. Since the emitted wavelength increases linearly with the temperature of the die, maintaining a stable die temperature for consistent colour output is important in the Number of LEDs. This is particularly important with the emerging families of white LEDs, as the human eye is able to differentiate very small colour changes in white light.
Also, the intensity of the emitted light is being dependent on the forward current supplied, and higher current causes the die temperature to increase. Good thermal management techniques are required to achieve bright light without exceeding the recommended maximum die temperature.
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This article was published in the September/October 2007 issue of LEDs Magazine.
To read the full version of this article, please visit our Magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine.
You can also request a print copy of LEDs Magazine (available by paid subscription) and sign up for our free weekly email newsletter . About the Author Nico Bruijnis is European Marketing Manager for The Bergquist Company . October 2007 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2004 2005 2006 2007 2008 2009

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